目的探讨急性缺血性脑卒中血管内介入治疗术后感染的影响因素。方法选取2021年1月至2023年10月在单县东大医院重症监护病房行血管内介入治疗术的160例急性缺血性脑卒中患者作为研究对象。统计术后14 d感染发生情况,采用Spearman分析探...目的探讨急性缺血性脑卒中血管内介入治疗术后感染的影响因素。方法选取2021年1月至2023年10月在单县东大医院重症监护病房行血管内介入治疗术的160例急性缺血性脑卒中患者作为研究对象。统计术后14 d感染发生情况,采用Spearman分析探讨术后感染与临床资料的相关性,采用多因素Logistic回归分析术后感染的影响因素。结果160例患者中,发生术后感染20例(12.50%),分离得到病原菌26株,多为头状葡萄球菌、表皮葡萄球菌、耐甲氧西林金黄色葡萄球菌等。感染患者年龄大于非感染患者,美国国立卫生院神经功能缺损(National Institute of Health stroke scale,NIHSS)评分、急性生理学和慢性健康状况评价Ⅱ(acute physiology and chronic health evaluationⅡ,APACHEⅡ)评分、糖尿病占比、低蛋白血症占比均高于非感染患者,重症监护病房住院时间长于非感染患者,差异有统计学意义(P<0.05)。Spearman相关分析显示,急性缺血性脑卒中血管内介入治疗术后感染的发生与NIHSS评分、APACHEⅡ评分、糖尿病、年龄、低蛋白血症、重症监护病房住院时间均呈正相关(r>0,P<0.05)。多因素Logistic回归分析结果显示,NIHSS评分、APACHEⅡ评分、糖尿病占比、年龄、低蛋白血症占比较高、重症监护病房住院时间较长为急性缺血性脑卒中血管内介入治疗术后感染发生的独立危险因素(P<0.05)。结论急性缺血性脑卒中血管内介入治疗术后感染的发生率较高,病原菌多为头状葡萄球菌、表皮葡萄球菌、耐甲氧西林金黄色葡萄球菌等,NIHSS评分、APACHEⅡ评分、糖尿病、低蛋白血症、年龄、重症监护病房住院时间为术后感染发生的主要影响因素。展开更多
Rationally regulating the porosity of hard carbon(HC),especially the closed pores matching the low potential plateau and the ultra-microporous structure suitable for Na+embedding,has been shown to be the key to improv...Rationally regulating the porosity of hard carbon(HC),especially the closed pores matching the low potential plateau and the ultra-microporous structure suitable for Na+embedding,has been shown to be the key to improving the sodium storage performance and initial coulombic efficiency(ICE).However,the preparation of such HC materials with specific pore structures still faces great challenges.Herein,a simple pre-oxidation strategy is employed to construct abundant closed ultra-microporous structures in soy protein powder-derived HC material,achieving a significant improvement in its ICE and platform capacity.The pre-oxidation process promotes the cross-linking degree of the soy protein,thereby hindering the directional growth of graphite domains during the carbonization process.The optimized HC exhibits ultra-high platform capacity(329 mAh g^(-1))and considerable energy density(148.5 Wh kg^(-1)).Based on the ex-situ Raman and X-ray photoelectron spectroscopy characterization results,the excellent sodium storage capacity of the HC material is attributed to the synergistic effect of adsorption-intercalation/filling.The presented work provides novel insights into the synthesis of other biomass-derived HC materials with abundant closed ultra-micro pores.展开更多
BACKGROUND Extramedullary plasmacytoma(EMP)represents one of the rarer forms of plasma cell malignancies,capable of impacting a variety of tissues and organs throughout the body.The majority of EMP cases are predomina...BACKGROUND Extramedullary plasmacytoma(EMP)represents one of the rarer forms of plasma cell malignancies,capable of impacting a variety of tissues and organs throughout the body.The majority of EMP cases are predominantly found in the head and neck region,especially within the laryngopharynx,as well as in the gastrointestinal tract.While there have been documented instances of oropharyngeal involvement in EMP cases in the academic literature,it is important to note that EMP specifically affecting the uvula is exceedingly uncommon.Furthermore,it is noteworthy that over 60% of epithelial carcinomas in the upper respiratory tract and oropharynx tend to metastasize to the cervical lymph nodes,indicating a propensity for regional spread in these types of cancers.In this context,we present a rare case of extramedullary plasmacytoma where the uvula served as the initially affected site.This case emphasizes the need for heightened awareness among clinicians regarding such unusual comorbidities,as early recognition and diagnosis can significantly influence patient management and treatment outcomes.In addition,a review of the relevant literature is included to further educate and inform healthcare professionals about this rare presentation,ultimately aiming to enhance clinical understanding and improve patient care in similar situations.CASE SUMMARY A 51-year-old man was admitted to our hospital because of a slowly enlarging neck mass.A physical examination revealed a palpable left lymph node,and magnetic resonance imaging(MRI)of the oropharynx and the neck showed a soft tissue mass in the oropharynx and enlargement of multiple lymph nodes in the neck.The soft tissue mass was diagnosed as plasmacytoma by immunohistochemical analysis.Monoclonal immunoglobulins and bone marrow biopsy showed normal results.Therefore,we diagnosed that as EMP of the uvula.After four cycles of adjuvant chemotherapy dominated by bortezomib,MRI reexamination showed a significant reduction of the mass in the oropharynx and the cervical lymph nodes.Afterwards,the λ light chain returned to normal levels.There was no evidence of evolution to multiple myeloma.CONCLUSION We have reported a rare case of extramedullary plasmacytoma with the uvula as the first affected site and the relevant literature is reviewed to improve clinicians'awareness of such rare comorbidities.展开更多
BACKGROUND The gut-vascular barrier(GVB)is critical for maintaining intestinal homeostasis,but its involvement in intestinal obstruction(IO)remains unclear.AIM To investigate GVB disruption in patients with IO and its...BACKGROUND The gut-vascular barrier(GVB)is critical for maintaining intestinal homeostasis,but its involvement in intestinal obstruction(IO)remains unclear.AIM To investigate GVB disruption in patients with IO and its association with perioperative infection,organ injury,and clinical prognosis.METHODS Intestinal tissues from surgical patients with IO(IO group)and without obstruction(control group)were analyzed for PV1,a biomarker of GVB disruption.In the IO group,PV1 expression correlated with clinical data.Patients were further stratified into PV1-high and PV1-low subgroups,and clinical parameters were compared.RESULTS PV1 expression was significantly elevated in the IO group.In the IO group,PV1 levels were positively correlated with perioperative infection markers,liver and kidney injury indices,and adverse prognostic indicators,including prolonged hospitalization,antibiotic use,fever duration,and postoperative complications.Several of these outcomes were significantly worse in the PV1-high subgroup than in the PV1-low subgroup,although severe postoperative complications and mortality did not differ.CONCLUSION Our findings demonstrate that IO induces GVB damage,and the extent of impairment is closely associated with infection,organ injury,and adverse clinical outcomes in surgical patients,suggesting a pathogenic role for GVB disruption in IO.展开更多
This study introduces a novel method for reconstructing the 3D model of aluminum foam using cross-sectional sequence images.Combining precision milling and image acquisition,high-qual-ity cross-sectional images are ob...This study introduces a novel method for reconstructing the 3D model of aluminum foam using cross-sectional sequence images.Combining precision milling and image acquisition,high-qual-ity cross-sectional images are obtained.Pore structures are segmented by the U-shaped network(U-Net)neural network integrated with the Canny edge detection operator,ensuring accurate pore delineation and edge extraction.The trained U-Net achieves 98.55%accuracy.The 2D data are superimposed and processed into 3D point clouds,enabling reconstruction of the pore structure and aluminum skeleton.Analysis of pore 01 shows the cross-sectional area initially increases,and then decreases with milling depth,with a uniform point distribution of 40 per layer.The reconstructed model exhibits a porosity of 77.5%,with section overlap rates between the 2D pore segmentation and the reconstructed model exceeding 96%,confirming high fidelity.Equivalent sphere diameters decrease with size,averaging 1.95 mm.Compression simulations reveal that the stress-strain curve of the 3D reconstruction model of aluminum foam exhibits fluctuations,and the stresses in the reconstruction model concentrate on thin cell walls,leading to localized deformations.This method accurately restores the aluminum foam’s complex internal structure,improving reconstruction preci-sion and simulation reliability.The approach offers a cost-efficient,high-precision technique for optimizing material performance in engineering applications.展开更多
The rise of smart wearable devices has driven the demand for flexible,high-performance optoelectronic devices with low power and easy high-density integration.Emerging Two-dimensional(2D)materials offer promising solu...The rise of smart wearable devices has driven the demand for flexible,high-performance optoelectronic devices with low power and easy high-density integration.Emerging Two-dimensional(2D)materials offer promising solutions.However,the use of 3D metal in traditional 2D devices often leads to Fermi-level pinning,compromising device performance.2D metallic materials,such as graphene and 2H-phase NbSe_(2),present a new avenue for addressing this issue and constructing high-performance,low-power photodetectors.In this work,we designed an all-2D asymmetric contacts photodetector using Gr and NbSe_(2)as electrodes for the 2D semiconductor WSe_(2).The asymmetric Schottky barriers and built-in electric fields facilitated by this architecture resulted in outstanding photovoltaic characteristics and self-powered photodetection.Under zero bias,the device exhibited a responsivity of 287 mA/W,a specific detectivity of 5.3×10^(11)Jones,and an external quantum efficiency of 88%.It also demonstrated an ultra-high light on/offratio(1.8×10^(5)),ultra-fast photoresponse speeds(80/72μs),broad-spectrum responsiveness(405980 nm),and exceptional cycling stability.The applications of the Gr/WSe_(2)/NbSe_(2)heterojunction in imaging and infrared optical communication have been explored,underscoring its significant potential.This work offers an idea to construct all-2D ultrathin optoelectronic devices.展开更多
Membrane technology has thus far played an essential role in promoting environmental sustainability through improving the quality of water.Taking into account the current growth rate of membrane products along with th...Membrane technology has thus far played an essential role in promoting environmental sustainability through improving the quality of water.Taking into account the current growth rate of membrane products along with the market capacity,a tremendous rise in the amount of end-of-life(EoL)membranes is inevitable.In 2022,the global records of EoL membranes reached 35,000 tons.Recycling and resource utilization of EoL membranes is a viable option and hold significant promises for energy conservation and carbon neutralization.The present work provides an extensive overview of the latest progress in the field in relation with the prominent application cases.Furthermore,the avenues for the contributions of membrane recycling treatment technology within the framework of“carbon neutrality”are discussed with emphasis on permeability,pollutant interception capacity,and other relevant factors associated with the recycled membranes.This review strives to summarize the recycling and efficient utilization of EoL membranes,aiming at providing technical support to reduce operational costs and promote the low-carbon development of membrane technology.展开更多
In this work,the synthesis of uniform zeolitic imidazolate framework-coated Mo-glycerate spheres and their subsequent conversion into hierarchical architecture containing bimetallic selenides heterostructures and nitr...In this work,the synthesis of uniform zeolitic imidazolate framework-coated Mo-glycerate spheres and their subsequent conversion into hierarchical architecture containing bimetallic selenides heterostructures and nitrogen-doped carbon shell are reported.Selenization temperature plays a significant role in determining the phases,morphology,and lithium-ion storage performance of the composite.Notably,the optimal electrode demonstrates an ultrahigh reversible capacity of 1298.2 mAh/g after 100 cycles at 0.2 A/g and an outstanding rate capability with the capacity still maintained 505.7 mAh/g after 300 cycles at 1.0 A/g,surpassing the calculated theoretical capacity according to individual component and most of the reported MoSe@C-or ZnSe@C-based anodes.Furthermore,ex-situ X-ray diffraction patterns reveal the combined conversion and alloying reaction mechanisms of the composite.展开更多
Improving the comprehensive performance of anion exchange membranes(AEMs)has a decisive impact on the wide application of anion exchange membrane fuel cells(AEMFCs).Herein,we prepared a series of new poly(phenanthrene...Improving the comprehensive performance of anion exchange membranes(AEMs)has a decisive impact on the wide application of anion exchange membrane fuel cells(AEMFCs).Herein,we prepared a series of new poly(phenanthrene-co-p-terphenyl piperidinium)(PPTP3F_(x)-DIL)AEMs with different fluorinated monomers for high performance AEMFCs.The polymerization of fluorinated monomers with other aryl monomers can effectively promote the separation of microphase in the membrane.It also has a high OH-conductivity at a low swelling.The membrane(PPTP3F_(4)-DIL)prepared by polycondensation of 2,2,2-trifluoro-1-(p-tolyl)ethan 1-one monomer achieves a high conductivity of 168.5 mS cm^(-1)at 80℃.At the same time,the water uptake is 40.0%and the swelling ratio is 12.1%.In addition,these membranes also have good mechanical properties and alkaline stability.After 1440 h of treatment in a NaOH(2 M)solution at 80℃,PPTP3F_(x)-DIL still maintains excellent tensile strength(>30.3 MPa)and elongation at break(>43.4%),and the conductivity retention of the PPTP3F_(1)-DIL membrane is 90.3%.The PPTP3F_(4)-DIL-based single cell exhibits a high peak power density(918.1 mW cm^(-2))and excellent durability(100 h)at 80℃.Therefore,these PPTP3F_(x)-DIL membranes have a wide range of applications in AEMFCs.展开更多
Research on hard carbon(HC)anodes for sodium-ion storage has focused on sodium storage mechanisms in both the high-potential slope and low-potential plateau regions,with the latter being particularly critical for enha...Research on hard carbon(HC)anodes for sodium-ion storage has focused on sodium storage mechanisms in both the high-potential slope and low-potential plateau regions,with the latter being particularly critical for enhancing energy density.Herein,a novel approach that combines ion exchange with low-temperature pyrolysis is presented to develop a closed-pore structure within HC.Leveraging a hard-template design,this approach precisely controls pore distribution and morphology,leading to a significant increase in the proportion of closed pores.In-situ characterization,density functional theory(DFT)calculations,and multi-scale simulations are used to investigate the micropore filling by sodium ions and the formation of clusters within the closed-pore structure.The findings underscore the crucial role of these structural features in enhancing electrochemical performance and offer a quantitative framework for the design of advanced HC materials.The optimized HC demonstrates a high reversible capacity of 413 mAh g^(-1)at a current density of 0.1 A g^(-1),excellent rate capability,and exceptional stability over 10,000 cycles.This study offers valuable insights into sodium-ion storage mechanisms in closed-pore HC and lays the groundwork for developing efficient and durable sodium storage materials.展开更多
Zinc ion batteries(ZIBs)are promising for large-scale energy storage applications,but the technology lacks high-capacity and high-stability cathode materials.Herein,oxygen vacancy-VN/V_(2)O_(3)/C(Ov-VN/V_(2)O_(3)/C)he...Zinc ion batteries(ZIBs)are promising for large-scale energy storage applications,but the technology lacks high-capacity and high-stability cathode materials.Herein,oxygen vacancy-VN/V_(2)O_(3)/C(Ov-VN/V_(2)O_(3)/C)heterostructural composite was successfully designed and synthesized as high-stability cathode to promote reversible ZIBs.Thanks to the oxygen-vacancy heterojunction features and the transformed amorphous new phase V_(10)O_(24)·12H_(2)O,Ov-VN/V_(2)O_(3)/C provides abundant channels and active sites for Zn^(2+)diffusion and adsorption.Thus,Ov-VN/V_(2)O_(3)/C as a cathode material for aqueous ZIBs exhibits excellent a high reversible capacity of 531mAh g^(-1)at 0.3 A g^(-1),good rate performance(446 mAh g^(-1)at a high current density of 10 A g^(-1)),and good stability(115 mAh g^(-1)at 20 A g^(-1)after 5000 cycles).More importantly,Ov-VN/V_(2)O_(3)/C//Zn assembled quasi-solidstate batteries also have excellent long-term cycling performance.This work not only obtains high-performance cathode materials,but also provides a new idea for the development of the synthesis of transformational new materials with the synergistic effect of vacancies(defects)and heterojunctions.展开更多
文摘目的探讨急性缺血性脑卒中血管内介入治疗术后感染的影响因素。方法选取2021年1月至2023年10月在单县东大医院重症监护病房行血管内介入治疗术的160例急性缺血性脑卒中患者作为研究对象。统计术后14 d感染发生情况,采用Spearman分析探讨术后感染与临床资料的相关性,采用多因素Logistic回归分析术后感染的影响因素。结果160例患者中,发生术后感染20例(12.50%),分离得到病原菌26株,多为头状葡萄球菌、表皮葡萄球菌、耐甲氧西林金黄色葡萄球菌等。感染患者年龄大于非感染患者,美国国立卫生院神经功能缺损(National Institute of Health stroke scale,NIHSS)评分、急性生理学和慢性健康状况评价Ⅱ(acute physiology and chronic health evaluationⅡ,APACHEⅡ)评分、糖尿病占比、低蛋白血症占比均高于非感染患者,重症监护病房住院时间长于非感染患者,差异有统计学意义(P<0.05)。Spearman相关分析显示,急性缺血性脑卒中血管内介入治疗术后感染的发生与NIHSS评分、APACHEⅡ评分、糖尿病、年龄、低蛋白血症、重症监护病房住院时间均呈正相关(r>0,P<0.05)。多因素Logistic回归分析结果显示,NIHSS评分、APACHEⅡ评分、糖尿病占比、年龄、低蛋白血症占比较高、重症监护病房住院时间较长为急性缺血性脑卒中血管内介入治疗术后感染发生的独立危险因素(P<0.05)。结论急性缺血性脑卒中血管内介入治疗术后感染的发生率较高,病原菌多为头状葡萄球菌、表皮葡萄球菌、耐甲氧西林金黄色葡萄球菌等,NIHSS评分、APACHEⅡ评分、糖尿病、低蛋白血症、年龄、重症监护病房住院时间为术后感染发生的主要影响因素。
基金supported by the National Natural Science Foundation of China(42167068,22269020)the Gansu Province Higher Education Industry Support Plan Project(2023CYZC-68)the Central Guidance for Local Science and Technology Development Funds Project(YDZX20216200001007)。
文摘Rationally regulating the porosity of hard carbon(HC),especially the closed pores matching the low potential plateau and the ultra-microporous structure suitable for Na+embedding,has been shown to be the key to improving the sodium storage performance and initial coulombic efficiency(ICE).However,the preparation of such HC materials with specific pore structures still faces great challenges.Herein,a simple pre-oxidation strategy is employed to construct abundant closed ultra-microporous structures in soy protein powder-derived HC material,achieving a significant improvement in its ICE and platform capacity.The pre-oxidation process promotes the cross-linking degree of the soy protein,thereby hindering the directional growth of graphite domains during the carbonization process.The optimized HC exhibits ultra-high platform capacity(329 mAh g^(-1))and considerable energy density(148.5 Wh kg^(-1)).Based on the ex-situ Raman and X-ray photoelectron spectroscopy characterization results,the excellent sodium storage capacity of the HC material is attributed to the synergistic effect of adsorption-intercalation/filling.The presented work provides novel insights into the synthesis of other biomass-derived HC materials with abundant closed ultra-micro pores.
基金Supported by Hunan Innovative Province Construction Special Task Book,No.2021SK4050Innovation Platform and Talent Program of Hunan Province,No.2023JJ30609.
文摘BACKGROUND Extramedullary plasmacytoma(EMP)represents one of the rarer forms of plasma cell malignancies,capable of impacting a variety of tissues and organs throughout the body.The majority of EMP cases are predominantly found in the head and neck region,especially within the laryngopharynx,as well as in the gastrointestinal tract.While there have been documented instances of oropharyngeal involvement in EMP cases in the academic literature,it is important to note that EMP specifically affecting the uvula is exceedingly uncommon.Furthermore,it is noteworthy that over 60% of epithelial carcinomas in the upper respiratory tract and oropharynx tend to metastasize to the cervical lymph nodes,indicating a propensity for regional spread in these types of cancers.In this context,we present a rare case of extramedullary plasmacytoma where the uvula served as the initially affected site.This case emphasizes the need for heightened awareness among clinicians regarding such unusual comorbidities,as early recognition and diagnosis can significantly influence patient management and treatment outcomes.In addition,a review of the relevant literature is included to further educate and inform healthcare professionals about this rare presentation,ultimately aiming to enhance clinical understanding and improve patient care in similar situations.CASE SUMMARY A 51-year-old man was admitted to our hospital because of a slowly enlarging neck mass.A physical examination revealed a palpable left lymph node,and magnetic resonance imaging(MRI)of the oropharynx and the neck showed a soft tissue mass in the oropharynx and enlargement of multiple lymph nodes in the neck.The soft tissue mass was diagnosed as plasmacytoma by immunohistochemical analysis.Monoclonal immunoglobulins and bone marrow biopsy showed normal results.Therefore,we diagnosed that as EMP of the uvula.After four cycles of adjuvant chemotherapy dominated by bortezomib,MRI reexamination showed a significant reduction of the mass in the oropharynx and the cervical lymph nodes.Afterwards,the λ light chain returned to normal levels.There was no evidence of evolution to multiple myeloma.CONCLUSION We have reported a rare case of extramedullary plasmacytoma with the uvula as the first affected site and the relevant literature is reviewed to improve clinicians'awareness of such rare comorbidities.
基金Supported by National Natural Science Foundation of China,No.82072204 and No.81701874Natural Science Foundation of Guangdong Province,China,No.2021A1515010990 and No.2025A1515012493.
文摘BACKGROUND The gut-vascular barrier(GVB)is critical for maintaining intestinal homeostasis,but its involvement in intestinal obstruction(IO)remains unclear.AIM To investigate GVB disruption in patients with IO and its association with perioperative infection,organ injury,and clinical prognosis.METHODS Intestinal tissues from surgical patients with IO(IO group)and without obstruction(control group)were analyzed for PV1,a biomarker of GVB disruption.In the IO group,PV1 expression correlated with clinical data.Patients were further stratified into PV1-high and PV1-low subgroups,and clinical parameters were compared.RESULTS PV1 expression was significantly elevated in the IO group.In the IO group,PV1 levels were positively correlated with perioperative infection markers,liver and kidney injury indices,and adverse prognostic indicators,including prolonged hospitalization,antibiotic use,fever duration,and postoperative complications.Several of these outcomes were significantly worse in the PV1-high subgroup than in the PV1-low subgroup,although severe postoperative complications and mortality did not differ.CONCLUSION Our findings demonstrate that IO induces GVB damage,and the extent of impairment is closely associated with infection,organ injury,and adverse clinical outcomes in surgical patients,suggesting a pathogenic role for GVB disruption in IO.
基金supported by the Key Research and DevelopmentPlan in Shanxi Province of China(No.201803D421045)the Natural Science Foundation of Shanxi Province(No.2021-0302-123104)。
文摘This study introduces a novel method for reconstructing the 3D model of aluminum foam using cross-sectional sequence images.Combining precision milling and image acquisition,high-qual-ity cross-sectional images are obtained.Pore structures are segmented by the U-shaped network(U-Net)neural network integrated with the Canny edge detection operator,ensuring accurate pore delineation and edge extraction.The trained U-Net achieves 98.55%accuracy.The 2D data are superimposed and processed into 3D point clouds,enabling reconstruction of the pore structure and aluminum skeleton.Analysis of pore 01 shows the cross-sectional area initially increases,and then decreases with milling depth,with a uniform point distribution of 40 per layer.The reconstructed model exhibits a porosity of 77.5%,with section overlap rates between the 2D pore segmentation and the reconstructed model exceeding 96%,confirming high fidelity.Equivalent sphere diameters decrease with size,averaging 1.95 mm.Compression simulations reveal that the stress-strain curve of the 3D reconstruction model of aluminum foam exhibits fluctuations,and the stresses in the reconstruction model concentrate on thin cell walls,leading to localized deformations.This method accurately restores the aluminum foam’s complex internal structure,improving reconstruction preci-sion and simulation reliability.The approach offers a cost-efficient,high-precision technique for optimizing material performance in engineering applications.
基金Liming Gao acknowledges funding from the National Natural Science Foundation of China(No.61727805).
文摘The rise of smart wearable devices has driven the demand for flexible,high-performance optoelectronic devices with low power and easy high-density integration.Emerging Two-dimensional(2D)materials offer promising solutions.However,the use of 3D metal in traditional 2D devices often leads to Fermi-level pinning,compromising device performance.2D metallic materials,such as graphene and 2H-phase NbSe_(2),present a new avenue for addressing this issue and constructing high-performance,low-power photodetectors.In this work,we designed an all-2D asymmetric contacts photodetector using Gr and NbSe_(2)as electrodes for the 2D semiconductor WSe_(2).The asymmetric Schottky barriers and built-in electric fields facilitated by this architecture resulted in outstanding photovoltaic characteristics and self-powered photodetection.Under zero bias,the device exhibited a responsivity of 287 mA/W,a specific detectivity of 5.3×10^(11)Jones,and an external quantum efficiency of 88%.It also demonstrated an ultra-high light on/offratio(1.8×10^(5)),ultra-fast photoresponse speeds(80/72μs),broad-spectrum responsiveness(405980 nm),and exceptional cycling stability.The applications of the Gr/WSe_(2)/NbSe_(2)heterojunction in imaging and infrared optical communication have been explored,underscoring its significant potential.This work offers an idea to construct all-2D ultrathin optoelectronic devices.
基金supported by the National Natural Science Foundation of China(Nos.52322001,52070183,and 52330001)the National Key R&D Program of China(No.2023YFE0113800)the Excellent Member of the Youth Innovation Promotion Association,Chinese Academy of Sciences(No.Y2023010).
文摘Membrane technology has thus far played an essential role in promoting environmental sustainability through improving the quality of water.Taking into account the current growth rate of membrane products along with the market capacity,a tremendous rise in the amount of end-of-life(EoL)membranes is inevitable.In 2022,the global records of EoL membranes reached 35,000 tons.Recycling and resource utilization of EoL membranes is a viable option and hold significant promises for energy conservation and carbon neutralization.The present work provides an extensive overview of the latest progress in the field in relation with the prominent application cases.Furthermore,the avenues for the contributions of membrane recycling treatment technology within the framework of“carbon neutrality”are discussed with emphasis on permeability,pollutant interception capacity,and other relevant factors associated with the recycled membranes.This review strives to summarize the recycling and efficient utilization of EoL membranes,aiming at providing technical support to reduce operational costs and promote the low-carbon development of membrane technology.
基金supported by the National Natural Science Foundation of China(No.22265017)the Open Fund of Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education(No.KF-21-04).
文摘In this work,the synthesis of uniform zeolitic imidazolate framework-coated Mo-glycerate spheres and their subsequent conversion into hierarchical architecture containing bimetallic selenides heterostructures and nitrogen-doped carbon shell are reported.Selenization temperature plays a significant role in determining the phases,morphology,and lithium-ion storage performance of the composite.Notably,the optimal electrode demonstrates an ultrahigh reversible capacity of 1298.2 mAh/g after 100 cycles at 0.2 A/g and an outstanding rate capability with the capacity still maintained 505.7 mAh/g after 300 cycles at 1.0 A/g,surpassing the calculated theoretical capacity according to individual component and most of the reported MoSe@C-or ZnSe@C-based anodes.Furthermore,ex-situ X-ray diffraction patterns reveal the combined conversion and alloying reaction mechanisms of the composite.
基金support of the National Natural Science Foundation of China(Grant 22278340&22078272)。
文摘Improving the comprehensive performance of anion exchange membranes(AEMs)has a decisive impact on the wide application of anion exchange membrane fuel cells(AEMFCs).Herein,we prepared a series of new poly(phenanthrene-co-p-terphenyl piperidinium)(PPTP3F_(x)-DIL)AEMs with different fluorinated monomers for high performance AEMFCs.The polymerization of fluorinated monomers with other aryl monomers can effectively promote the separation of microphase in the membrane.It also has a high OH-conductivity at a low swelling.The membrane(PPTP3F_(4)-DIL)prepared by polycondensation of 2,2,2-trifluoro-1-(p-tolyl)ethan 1-one monomer achieves a high conductivity of 168.5 mS cm^(-1)at 80℃.At the same time,the water uptake is 40.0%and the swelling ratio is 12.1%.In addition,these membranes also have good mechanical properties and alkaline stability.After 1440 h of treatment in a NaOH(2 M)solution at 80℃,PPTP3F_(x)-DIL still maintains excellent tensile strength(>30.3 MPa)and elongation at break(>43.4%),and the conductivity retention of the PPTP3F_(1)-DIL membrane is 90.3%.The PPTP3F_(4)-DIL-based single cell exhibits a high peak power density(918.1 mW cm^(-2))and excellent durability(100 h)at 80℃.Therefore,these PPTP3F_(x)-DIL membranes have a wide range of applications in AEMFCs.
基金supported by the National Natural Science Foundation of China(22269020,U23A20582,42167068)the Outstanding Youth Fund of Gansu Province(20JR5RA539)+1 种基金the Gansu Province Higher Education Industry Support Plan Project(2023CYZC-17)2024 Major Cultivation Project for University Research and Innovation Platforms(2024CXPT-10)。
文摘Research on hard carbon(HC)anodes for sodium-ion storage has focused on sodium storage mechanisms in both the high-potential slope and low-potential plateau regions,with the latter being particularly critical for enhancing energy density.Herein,a novel approach that combines ion exchange with low-temperature pyrolysis is presented to develop a closed-pore structure within HC.Leveraging a hard-template design,this approach precisely controls pore distribution and morphology,leading to a significant increase in the proportion of closed pores.In-situ characterization,density functional theory(DFT)calculations,and multi-scale simulations are used to investigate the micropore filling by sodium ions and the formation of clusters within the closed-pore structure.The findings underscore the crucial role of these structural features in enhancing electrochemical performance and offer a quantitative framework for the design of advanced HC materials.The optimized HC demonstrates a high reversible capacity of 413 mAh g^(-1)at a current density of 0.1 A g^(-1),excellent rate capability,and exceptional stability over 10,000 cycles.This study offers valuable insights into sodium-ion storage mechanisms in closed-pore HC and lays the groundwork for developing efficient and durable sodium storage materials.
基金financially supported by the National Natural Science Foundation of China(Nos.22269020 and 42167068)the Central Guidance for Local Science and Technology Development Funds Project(No.YDZX20216200001007)+1 种基金the Project of Key Laboratory of Characteristic Resources Utilization in Hexi Corridor(No.XZ2007)the Industry Support Plan Project from Gansu Provincial Department of Education(No.2023CYZC-68)
文摘Zinc ion batteries(ZIBs)are promising for large-scale energy storage applications,but the technology lacks high-capacity and high-stability cathode materials.Herein,oxygen vacancy-VN/V_(2)O_(3)/C(Ov-VN/V_(2)O_(3)/C)heterostructural composite was successfully designed and synthesized as high-stability cathode to promote reversible ZIBs.Thanks to the oxygen-vacancy heterojunction features and the transformed amorphous new phase V_(10)O_(24)·12H_(2)O,Ov-VN/V_(2)O_(3)/C provides abundant channels and active sites for Zn^(2+)diffusion and adsorption.Thus,Ov-VN/V_(2)O_(3)/C as a cathode material for aqueous ZIBs exhibits excellent a high reversible capacity of 531mAh g^(-1)at 0.3 A g^(-1),good rate performance(446 mAh g^(-1)at a high current density of 10 A g^(-1)),and good stability(115 mAh g^(-1)at 20 A g^(-1)after 5000 cycles).More importantly,Ov-VN/V_(2)O_(3)/C//Zn assembled quasi-solidstate batteries also have excellent long-term cycling performance.This work not only obtains high-performance cathode materials,but also provides a new idea for the development of the synthesis of transformational new materials with the synergistic effect of vacancies(defects)and heterojunctions.
