It is essential to develop a methanol gas sensor with high selectivity and low working temperature for human health and environmental monitoring.In this work,a blend of PEDOT:PSS and Ti3C2Tx with the mass ratio of 4:1...It is essential to develop a methanol gas sensor with high selectivity and low working temperature for human health and environmental monitoring.In this work,a blend of PEDOT:PSS and Ti3C2Tx with the mass ratio of 4:1 is used to fabricate a methanol gas sensor.It possesses a high response ratio of the largest response and the second largest response(5.54)and an enhanced response compared to pure PEDOT:PSS and pure Ti3C2Tx tested at room temperature.These findings may pave the way towards design of the MXenes based high-performance gas-sensing materials in the future.展开更多
In this work,a PEDOT:PSS/Sn:α-Ga_(2)O_(3) hybrid heterojunction diode(HJD)photodetector was fabricated by spin-coat-ing highly conductive PEDOT:PSS aqueous solution on the mist chemical vapor deposition(Mist-CVD)grow...In this work,a PEDOT:PSS/Sn:α-Ga_(2)O_(3) hybrid heterojunction diode(HJD)photodetector was fabricated by spin-coat-ing highly conductive PEDOT:PSS aqueous solution on the mist chemical vapor deposition(Mist-CVD)grown Sn:α-Ga_(2)O_(3) film.This approach provides a facile and low-cost p-PEDOT:PSS/n-Sn:α-Ga_(2)O_(3) spin-coating method that facilitates self-powering per-formance through p-n junction formation.A typical type-Ⅰheterojunction is formed at the interface of Sn:α-Ga_(2)O_(3) film and PEDOT:PSS,and contributes to a significant photovoltaic effect with an open-circuit voltage(Voc)of 0.4 V under the 254 nm ultra-violet(UV)light.When operating in self-powered mode,the HJD exhibits excellent photo-response performance including an outstanding photo-current of 10.9 nA,a rapid rise/decay time of 0.38/0.28 s,and a large on/off ratio of 91.2.Additionally,the HJD also possesses excellent photo-detection performance with a high responsivity of 5.61 mA/W and a good detectivity of 1.15×1011 Jones at 0 V bias under 254 nm UV light illumination.Overall,this work may explore the potential range of self-pow-ered and high-performance UV photodetectors.展开更多
Theα-Ga2 O_(3)nanorod array is grown on FTO by hydrothermal and annealing processes.And a self-powered PEDOT:PSS/α-Ga_(2)O_(3)nanorod array/FTO(PGF)photodetector has been demonstrated by spin coating PEDOT:PSS on th...Theα-Ga2 O_(3)nanorod array is grown on FTO by hydrothermal and annealing processes.And a self-powered PEDOT:PSS/α-Ga_(2)O_(3)nanorod array/FTO(PGF)photodetector has been demonstrated by spin coating PEDOT:PSS on theα-Ga_(2)O_(3)nanorod array.Successfully,the PGF photodetector shows solar-blind UV/visible dual-band photodetection.Our device possesses comparable solar-blind UV responsivity(0.18 mA/W at 235 nm)and much faster response speed(0.102 s)than most of the reported self-poweredα-Ga_(2)O_(3)nanorod array solar-blind UV photodetectors.And it presents the featured and distinguished visible band photoresponse with a response speed of 0.136 s at 540 nm.The response time is also much faster than the other non-self-poweredβ-Ga_(2)O_(3)DUV/visible dual-band photodetectors due to the fast-speed separation of photogenerated carries by the built-in electric field in the depletion regions of PEDOT:PSS/α-Ga_(2)O_(3)heterojunction.The results herein may prove a promising way to realize fast-speed self-poweredα-Ga_(2)O_(3)photodetectors with solar-blind UV/visible dual-band photodetection by simple processes for the applications of multiple-target tracking,imaging,machine vision and communication.展开更多
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) incorporated with nanocrystalline TiO2 powder (PEDOT:PSS+nc-TiO2) films were prepared by spin-coating technique. SEM surface morphology, UV-Vis spectra and NH3 g...Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) incorporated with nanocrystalline TiO2 powder (PEDOT:PSS+nc-TiO2) films were prepared by spin-coating technique. SEM surface morphology, UV-Vis spectra and NH3 gas sensing of were studied. Results showed that the PEDOT:PSS+nc-TiO2 film with a content of 9.0 wt% of TiO2 is most suitable for both the hole transport layer and the NH3 sensing. The responding time of the sensor made from this composite film reached a value as fast as 20 s. The rapid responsiveness to NH3 gas was attributed to the efficient movement of holes as the major charge carriers in PEDOT:PSS+nc-TiO2 composite films. Useful applications in organic electronic devices like light emitting diodes and gas thin film sensors can be envisaged.展开更多
Can the modulation effect of charge-carrier transfer be inherited from a single layer to its heterojunction structure?Certainly,the answer is yes.Herein,we experimentally verify that the photodetection performance mod...Can the modulation effect of charge-carrier transfer be inherited from a single layer to its heterojunction structure?Certainly,the answer is yes.Herein,we experimentally verify that the photodetection performance modulation effect of oxygen vacancy(Vo)is transmitted from theε-Ga_(2)O_(3)layer to the PEDOT:PSS/ε-Ga_(2)O_(3)(PGO)hybrid heterojunction.By adopting the annealedε-Ga_(2)O_(3)films,whose Voconcentrations are remolded by annealing ambients,the constructed PGO photodetectors(PDs)demonstrate regulable self-powered performance.As the V_(o)defects decrease,the photodetection properties are effectively enhanced with a high photo-to-dark current ratio of 2.37×10^(7),an excellent on/off switching ratio of 6.45×10^(5),fast rise/decay time of 121/72 ms,a large responsivity of 67.9 m A/W,superior detectivity of 9.2×10^(13)Jones,an outstanding external quantum efficiency of 33.2%,and a high rejection ratio(R_(250)/R_(400))of 5.96×10^(6)at 0 V in PGO-O;PD.The better photoresponse is attributed to the less V_(o)defect concentration in theε-Ga_(2)O_(3)layer,which could favor the lower electron-trapping probability and a more efficient charge-carrier transfer.Considering the universality of V_(o)defects in oxide materials,the proposed regulation strategy of photoresponse will open the route of high self-powered performance for next-generation ultraviolet PDs.展开更多
A versatile sensing platform employing inorganic MoS_(2) nanoflowers and organic poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)has been investigated to develop the resistive and capacitive force-...A versatile sensing platform employing inorganic MoS_(2) nanoflowers and organic poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)has been investigated to develop the resistive and capacitive force-sensitive devices.The microstructure of the sensing layer heightens the sensitivity and response time of the dual-mode pressure sensors by augmenting electron pathways and inner stress in response to mechanical stimuli.Consequently,the capacitive and resistive sensors exhibit sensitivities of 0.37 and 0.12 kPa^(-1),respectively,while demonstrating a remarkable response time of approximately 100 ms.Furthermore,it is noteworthy that the PEDOT:PSS layer exhibits excellent adhesion to polydimethylsiloxane(PDMS)substrates,which contributes to the development of highly robust force-sensitive sensors capable of enduring more than 10000loading/unloading cycles.The combination of MoS_(2)/PEDOT:PSS layers in these dual-mode sensors has shown promising results in detecting human joint movements and subtle physiological signals.Notably,the sensors have achieved a remarkable precision rate of 98%in identifying target objects.These outcomes underscore the significant potential of these sensors for integration into applications such as electronic skin and human-machine interaction.展开更多
In recent years,a novel PEDOT:PSS/n-Si planar heterojunction solar cell has been extensively studied in the photovoltaic field.Different V_(2)O_(5)-IPA concentrations mixed in PEDOT:PSS samples as hole transport layer...In recent years,a novel PEDOT:PSS/n-Si planar heterojunction solar cell has been extensively studied in the photovoltaic field.Different V_(2)O_(5)-IPA concentrations mixed in PEDOT:PSS samples as hole transport layer were prepared by means of spin coating technique and mechanical mixing of organic and inorganic materials.V_(2)O_(5)was studied for its effects on the surface morphology,chemical composition,and optical transmittance of PEDOT:PSS films.The findings of the study show that the addition of V_(2)O_(5)particles changes the surface morphology of PEDOT:PSS films and promotes its superior ohmic contact with the Si interface.Furthermore,PEDOT:PSS incorporated with V_(2)O_(5)particles that have outstanding optical and semiconductor properties reduces the rate of carrier recombination at the device interface and blocks electron transport to the anode in the fabricated Si-based solar cells.When compared to conventional PEDOT:PSS/Si planar heterojunction solar cells,the fill factor,photoelectric conversion efficiency,open-circuit voltage,and short-circuit current density of the devices prepared in this study can be significantly improved,reaching up to 70.98%,15.17%,652 mV and 32.8 mA/cm^(2),respectively.This research provides a promising and effective method for improving the photoelectric conversion performance of PEDOT:PSS/Si heterojunction solar cells,which enables the application of V_(2)O_(5)in Si solar cells.展开更多
In this study, organic solar cells (OSCs) with an active layer, a blend of polymer of non-fullerene (NFA) Y6 as an acceptor, and donor PBDB-T-2F as donor were simulated through the one-dimensional solar capacitance si...In this study, organic solar cells (OSCs) with an active layer, a blend of polymer of non-fullerene (NFA) Y6 as an acceptor, and donor PBDB-T-2F as donor were simulated through the one-dimensional solar capacitance simulator (SCAPS-1D) software to examine the performance of this type of organic polymer thin-film solar cell by varying the thickness of the active layer. PFN-Br interfacial layer entrenched in OPV devices gives overall enhanced open-circuit voltage, short-circuit current density and fill factor thus improving device performance. PEDOT: PSS is an electro-conductive polymer solution that has been extensively utilized in solar cell devices as a hole transport layer (HTL) due to its strong hole affinity, good thermal and mechanical stability, high work function, and high transparency in the visible range. The structure of the organic solar cell is ITO/PEDOT: PSS/BTP-4F: PBDB-T-2F/PFN-Br/Ag. Firstly, the active layer thickness was optimized to 100 nm;after that, the active-layer thickness was varied up to 900 nm. The results of these simulations demonstrated that the active layer thickness improves efficiency significantly up to 500 nm, then it decreased with increasing the thickness of the active layer from 600 nm, also notice that the short circuit current and the fill factor decrease with increasing the active layer from 600 nm, while the open voltage circuit increased with increasing the thickness of the active layer. The optimum thickness is 500 nm.展开更多
Benefiting from features such as high-voltage platforms,superior energy density,and cost-effectiveness,Zinc-bromine flow batteries(ZBFBs)demonstrate significant potential for large-scale energy storage applications.Ho...Benefiting from features such as high-voltage platforms,superior energy density,and cost-effectiveness,Zinc-bromine flow batteries(ZBFBs)demonstrate significant potential for large-scale energy storage applications.However,their practical implementation faces critical challenges:sluggish Br_(2)/Br^(-)redox reactions and severe shuttle effects,which lead to diminished energy efficiency and self-discharge.Here,we develop an innovative electrochemical self-induced catalyst gel encapsulation strategy.Under electrochemical driving,the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS,abbreviated as PES)catalyst spontaneously undergoes gelation and coating on carbon fibers,thereby forming a PES@C composite cathode with enhanced bromine conversion reversibility.This innovative strategy effectively addresses three critical challenges in existing ZBFBs:shuttle effect,low bromine utilization,and poor energy efficiency.PES@C with sulfur sites and C–O-C group enable efficient bromine/poly-bromide anchoring through strong polar interactions,effectively suppressing shuttling effects.Furthermore,the abundant active sites exhibit exceptional catalytic activity towards Br_(2)/Br^(-)redox reactions.This synergistic adsorption-catalysis mechanism significantly enhances the electrochemical performance of ZBFBs.The ZBFBs with PES@C achieve stable operation under ultrahigh current density(200 mA cm^(-2))and high areal capacity(40 mA h cm^(-2)),delivering outstanding voltage efficiency(84.91%)and energy efficiency(81.78%).Notably,the proposed strategy demonstrates universal applicability for performance enhancement in various bromine-based battery systems,providing an efficient pathway to improve energy efficiency and cycling durability in bromine-based flow batteries.展开更多
Carbon fiber-reinforced plastics (CFRPs) possess pronounced anisotropic properties, necessitating advancements in through-thickness electrical conductivity and other functionalities without compromising mechanical int...Carbon fiber-reinforced plastics (CFRPs) possess pronounced anisotropic properties, necessitating advancements in through-thickness electrical conductivity and other functionalities without compromising mechanical integrity. MXenes, as an emerging family of two-dimensional nanomaterials, have demonstrated significant potential for enhancement modification in this area. However, achieving uniform distribution and effective utilization on a large scale with low filler content has posed a significant challenge. Herein, a highly lightweight, flexible, and functional Ti_(3)C_(2)T_(x)/ poly(3,4-ethylene-dioxythiophene) poly (styrene sulfonate) (PEDOT: PSS) /Ammonium polyphosphate (APP) reclaimed carbon fiber (rCF) veil reinforced plastics (MPA-rCFRPs) was fabricated through large-scale vacuum-assisted filtration and autoclave technology. The modified MPA-rCFRPs have exhibited substantial improvements in electromagnetic shielding with MXene additive amounts as low as 0.24 %-1.07 %, increasing the electro-magnetic interference shielding effectiveness (EMI SE) to 87.12 dB, improved by 350.02 %. Remarkably, the through-thickness electrical conductivity of MPA-rCFRPs exhibited a 767.14 % improvement, escalating from 19.73 S/m to 151.41 S/m. Meanwhile, the modified composites have exhibited enhanced photothermal, electrothermal, and flame-retardant properties, and the above improvements have not shown a significant impact on the mechanical properties of the material. This work represents a practical solution for the construction of large-scale MXene-based carbon fiber composites and opens the door to functional reutilization of rCF materials.展开更多
基金supported by the National Natural Science Foundation of China(No.51602035)State Scholarship Fund of China,Liaoning Provincial Natural Science Foundation of China(No.20180510036)the Fundamental Research Funds for the Central Universities(No.DUT19JC41)。
文摘It is essential to develop a methanol gas sensor with high selectivity and low working temperature for human health and environmental monitoring.In this work,a blend of PEDOT:PSS and Ti3C2Tx with the mass ratio of 4:1 is used to fabricate a methanol gas sensor.It possesses a high response ratio of the largest response and the second largest response(5.54)and an enhanced response compared to pure PEDOT:PSS and pure Ti3C2Tx tested at room temperature.These findings may pave the way towards design of the MXenes based high-performance gas-sensing materials in the future.
基金supported by the National Key Research and Development Program of China (Grant No.2022YFB3605404)the Young Scientists Fund of the National Natural Science Foundation of China (Grant Nos.62204125,62305171,62204126,and 62304113)+3 种基金the Joints Fund of the National Natural Science Foundation of China (Grant No.U23A20349)the Natural Science Foundation of Jiangsu Province (Grant No.BK20230361)the Natural Science Research Startup Foundation of Recuring Talents of Nanjing University of Posts and Telecommunications (Grant No.XK1060921119)the Jiangsu Provincial Team of Innovation and Entrepreneurship (Grant No.JSSCTD202351).
文摘In this work,a PEDOT:PSS/Sn:α-Ga_(2)O_(3) hybrid heterojunction diode(HJD)photodetector was fabricated by spin-coat-ing highly conductive PEDOT:PSS aqueous solution on the mist chemical vapor deposition(Mist-CVD)grown Sn:α-Ga_(2)O_(3) film.This approach provides a facile and low-cost p-PEDOT:PSS/n-Sn:α-Ga_(2)O_(3) spin-coating method that facilitates self-powering per-formance through p-n junction formation.A typical type-Ⅰheterojunction is formed at the interface of Sn:α-Ga_(2)O_(3) film and PEDOT:PSS,and contributes to a significant photovoltaic effect with an open-circuit voltage(Voc)of 0.4 V under the 254 nm ultra-violet(UV)light.When operating in self-powered mode,the HJD exhibits excellent photo-response performance including an outstanding photo-current of 10.9 nA,a rapid rise/decay time of 0.38/0.28 s,and a large on/off ratio of 91.2.Additionally,the HJD also possesses excellent photo-detection performance with a high responsivity of 5.61 mA/W and a good detectivity of 1.15×1011 Jones at 0 V bias under 254 nm UV light illumination.Overall,this work may explore the potential range of self-pow-ered and high-performance UV photodetectors.
基金Project supported by the National Natural Science Foundation of China(Grant No.61705155)。
文摘Theα-Ga2 O_(3)nanorod array is grown on FTO by hydrothermal and annealing processes.And a self-powered PEDOT:PSS/α-Ga_(2)O_(3)nanorod array/FTO(PGF)photodetector has been demonstrated by spin coating PEDOT:PSS on theα-Ga_(2)O_(3)nanorod array.Successfully,the PGF photodetector shows solar-blind UV/visible dual-band photodetection.Our device possesses comparable solar-blind UV responsivity(0.18 mA/W at 235 nm)and much faster response speed(0.102 s)than most of the reported self-poweredα-Ga_(2)O_(3)nanorod array solar-blind UV photodetectors.And it presents the featured and distinguished visible band photoresponse with a response speed of 0.136 s at 540 nm.The response time is also much faster than the other non-self-poweredβ-Ga_(2)O_(3)DUV/visible dual-band photodetectors due to the fast-speed separation of photogenerated carries by the built-in electric field in the depletion regions of PEDOT:PSS/α-Ga_(2)O_(3)heterojunction.The results herein may prove a promising way to realize fast-speed self-poweredα-Ga_(2)O_(3)photodetectors with solar-blind UV/visible dual-band photodetection by simple processes for the applications of multiple-target tracking,imaging,machine vision and communication.
文摘Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) incorporated with nanocrystalline TiO2 powder (PEDOT:PSS+nc-TiO2) films were prepared by spin-coating technique. SEM surface morphology, UV-Vis spectra and NH3 gas sensing of were studied. Results showed that the PEDOT:PSS+nc-TiO2 film with a content of 9.0 wt% of TiO2 is most suitable for both the hole transport layer and the NH3 sensing. The responding time of the sensor made from this composite film reached a value as fast as 20 s. The rapid responsiveness to NH3 gas was attributed to the efficient movement of holes as the major charge carriers in PEDOT:PSS+nc-TiO2 composite films. Useful applications in organic electronic devices like light emitting diodes and gas thin film sensors can be envisaged.
基金supported by the National Natural Science Foundation of China(Grant Nos.61774019,61704153)。
文摘Can the modulation effect of charge-carrier transfer be inherited from a single layer to its heterojunction structure?Certainly,the answer is yes.Herein,we experimentally verify that the photodetection performance modulation effect of oxygen vacancy(Vo)is transmitted from theε-Ga_(2)O_(3)layer to the PEDOT:PSS/ε-Ga_(2)O_(3)(PGO)hybrid heterojunction.By adopting the annealedε-Ga_(2)O_(3)films,whose Voconcentrations are remolded by annealing ambients,the constructed PGO photodetectors(PDs)demonstrate regulable self-powered performance.As the V_(o)defects decrease,the photodetection properties are effectively enhanced with a high photo-to-dark current ratio of 2.37×10^(7),an excellent on/off switching ratio of 6.45×10^(5),fast rise/decay time of 121/72 ms,a large responsivity of 67.9 m A/W,superior detectivity of 9.2×10^(13)Jones,an outstanding external quantum efficiency of 33.2%,and a high rejection ratio(R_(250)/R_(400))of 5.96×10^(6)at 0 V in PGO-O;PD.The better photoresponse is attributed to the less V_(o)defect concentration in theε-Ga_(2)O_(3)layer,which could favor the lower electron-trapping probability and a more efficient charge-carrier transfer.Considering the universality of V_(o)defects in oxide materials,the proposed regulation strategy of photoresponse will open the route of high self-powered performance for next-generation ultraviolet PDs.
基金supported by the Natural Science Foundation of Guangdong Province(Grant No.2021A1515010691)the College Innovation Team Project of Guangdong Province(Grant No.2021KCXTD042)Wuyi University-Hong Kong-Macao Joint Research and Development Fund(Grant No.2019WGALH06)。
文摘A versatile sensing platform employing inorganic MoS_(2) nanoflowers and organic poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)has been investigated to develop the resistive and capacitive force-sensitive devices.The microstructure of the sensing layer heightens the sensitivity and response time of the dual-mode pressure sensors by augmenting electron pathways and inner stress in response to mechanical stimuli.Consequently,the capacitive and resistive sensors exhibit sensitivities of 0.37 and 0.12 kPa^(-1),respectively,while demonstrating a remarkable response time of approximately 100 ms.Furthermore,it is noteworthy that the PEDOT:PSS layer exhibits excellent adhesion to polydimethylsiloxane(PDMS)substrates,which contributes to the development of highly robust force-sensitive sensors capable of enduring more than 10000loading/unloading cycles.The combination of MoS_(2)/PEDOT:PSS layers in these dual-mode sensors has shown promising results in detecting human joint movements and subtle physiological signals.Notably,the sensors have achieved a remarkable precision rate of 98%in identifying target objects.These outcomes underscore the significant potential of these sensors for integration into applications such as electronic skin and human-machine interaction.
基金supported by the National Natural Science Foundation of China(Grant No.52164050,51762043,61764009,51974143)National Key R&D Program of China(No.2018YFC1901801,No.2018YFC1901805)+1 种基金Major Science and Technology Project of Yunnan Province(202202AB080010,2019ZE00703)Yunnan University“Double First-class”Construction Joint Special Project-major project(202201BF070001-018).
文摘In recent years,a novel PEDOT:PSS/n-Si planar heterojunction solar cell has been extensively studied in the photovoltaic field.Different V_(2)O_(5)-IPA concentrations mixed in PEDOT:PSS samples as hole transport layer were prepared by means of spin coating technique and mechanical mixing of organic and inorganic materials.V_(2)O_(5)was studied for its effects on the surface morphology,chemical composition,and optical transmittance of PEDOT:PSS films.The findings of the study show that the addition of V_(2)O_(5)particles changes the surface morphology of PEDOT:PSS films and promotes its superior ohmic contact with the Si interface.Furthermore,PEDOT:PSS incorporated with V_(2)O_(5)particles that have outstanding optical and semiconductor properties reduces the rate of carrier recombination at the device interface and blocks electron transport to the anode in the fabricated Si-based solar cells.When compared to conventional PEDOT:PSS/Si planar heterojunction solar cells,the fill factor,photoelectric conversion efficiency,open-circuit voltage,and short-circuit current density of the devices prepared in this study can be significantly improved,reaching up to 70.98%,15.17%,652 mV and 32.8 mA/cm^(2),respectively.This research provides a promising and effective method for improving the photoelectric conversion performance of PEDOT:PSS/Si heterojunction solar cells,which enables the application of V_(2)O_(5)in Si solar cells.
文摘In this study, organic solar cells (OSCs) with an active layer, a blend of polymer of non-fullerene (NFA) Y6 as an acceptor, and donor PBDB-T-2F as donor were simulated through the one-dimensional solar capacitance simulator (SCAPS-1D) software to examine the performance of this type of organic polymer thin-film solar cell by varying the thickness of the active layer. PFN-Br interfacial layer entrenched in OPV devices gives overall enhanced open-circuit voltage, short-circuit current density and fill factor thus improving device performance. PEDOT: PSS is an electro-conductive polymer solution that has been extensively utilized in solar cell devices as a hole transport layer (HTL) due to its strong hole affinity, good thermal and mechanical stability, high work function, and high transparency in the visible range. The structure of the organic solar cell is ITO/PEDOT: PSS/BTP-4F: PBDB-T-2F/PFN-Br/Ag. Firstly, the active layer thickness was optimized to 100 nm;after that, the active-layer thickness was varied up to 900 nm. The results of these simulations demonstrated that the active layer thickness improves efficiency significantly up to 500 nm, then it decreased with increasing the thickness of the active layer from 600 nm, also notice that the short circuit current and the fill factor decrease with increasing the active layer from 600 nm, while the open voltage circuit increased with increasing the thickness of the active layer. The optimum thickness is 500 nm.
基金supported by the Baima Lake Laboratory Joint Fund of the Zhejiang Provincial Natural Science Foundation of China(LBMHZ25B030004)the National Natural Science Foundation of China(52172159)the Postdoctoral Fellowship Program of CPSF(GZB20230631)。
文摘Benefiting from features such as high-voltage platforms,superior energy density,and cost-effectiveness,Zinc-bromine flow batteries(ZBFBs)demonstrate significant potential for large-scale energy storage applications.However,their practical implementation faces critical challenges:sluggish Br_(2)/Br^(-)redox reactions and severe shuttle effects,which lead to diminished energy efficiency and self-discharge.Here,we develop an innovative electrochemical self-induced catalyst gel encapsulation strategy.Under electrochemical driving,the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS,abbreviated as PES)catalyst spontaneously undergoes gelation and coating on carbon fibers,thereby forming a PES@C composite cathode with enhanced bromine conversion reversibility.This innovative strategy effectively addresses three critical challenges in existing ZBFBs:shuttle effect,low bromine utilization,and poor energy efficiency.PES@C with sulfur sites and C–O-C group enable efficient bromine/poly-bromide anchoring through strong polar interactions,effectively suppressing shuttling effects.Furthermore,the abundant active sites exhibit exceptional catalytic activity towards Br_(2)/Br^(-)redox reactions.This synergistic adsorption-catalysis mechanism significantly enhances the electrochemical performance of ZBFBs.The ZBFBs with PES@C achieve stable operation under ultrahigh current density(200 mA cm^(-2))and high areal capacity(40 mA h cm^(-2)),delivering outstanding voltage efficiency(84.91%)and energy efficiency(81.78%).Notably,the proposed strategy demonstrates universal applicability for performance enhancement in various bromine-based battery systems,providing an efficient pathway to improve energy efficiency and cycling durability in bromine-based flow batteries.
文摘Carbon fiber-reinforced plastics (CFRPs) possess pronounced anisotropic properties, necessitating advancements in through-thickness electrical conductivity and other functionalities without compromising mechanical integrity. MXenes, as an emerging family of two-dimensional nanomaterials, have demonstrated significant potential for enhancement modification in this area. However, achieving uniform distribution and effective utilization on a large scale with low filler content has posed a significant challenge. Herein, a highly lightweight, flexible, and functional Ti_(3)C_(2)T_(x)/ poly(3,4-ethylene-dioxythiophene) poly (styrene sulfonate) (PEDOT: PSS) /Ammonium polyphosphate (APP) reclaimed carbon fiber (rCF) veil reinforced plastics (MPA-rCFRPs) was fabricated through large-scale vacuum-assisted filtration and autoclave technology. The modified MPA-rCFRPs have exhibited substantial improvements in electromagnetic shielding with MXene additive amounts as low as 0.24 %-1.07 %, increasing the electro-magnetic interference shielding effectiveness (EMI SE) to 87.12 dB, improved by 350.02 %. Remarkably, the through-thickness electrical conductivity of MPA-rCFRPs exhibited a 767.14 % improvement, escalating from 19.73 S/m to 151.41 S/m. Meanwhile, the modified composites have exhibited enhanced photothermal, electrothermal, and flame-retardant properties, and the above improvements have not shown a significant impact on the mechanical properties of the material. This work represents a practical solution for the construction of large-scale MXene-based carbon fiber composites and opens the door to functional reutilization of rCF materials.
