Piezoelectric silicon carbide(SiC)has been quite attractive due to its superior chemical and physical properties as well as wide potential applications.However,the inherent brittleness and unsatisfactory piezoelectric...Piezoelectric silicon carbide(SiC)has been quite attractive due to its superior chemical and physical properties as well as wide potential applications.However,the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified applications.Here,flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators(PENGs)and stress/temperature/light sensors.The open cir-cuit voltage(V_(oc))and the density of short circuit current(I_(sc))of the PENG based on the PVDF/5 wt%6H-SiC composite fiber films reach 28.94 V and 0.24μA cm^(-2),showing a significant improvement of 240%and 300%compared with that based on the pure PVDF films.The effect of 6H-SiC nanoparticles(NPs)on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element analysis.The stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding stimuli.This study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.展开更多
Ultra-stable piezoelectric nanogenerator(PENG)driven by environmental actuation sources with all-weather service capability is highly desirable.Here,the PENG based on N doped 4H-SiC nanohole arrays(NHAs)is proposed to...Ultra-stable piezoelectric nanogenerator(PENG)driven by environmental actuation sources with all-weather service capability is highly desirable.Here,the PENG based on N doped 4H-SiC nanohole arrays(NHAs)is proposed to harvest ambient energy under low/high temperature and relative humidity(RH)conditions.Finite element method simulation of N doped 4H-SiC NHAs in compression mode is developed to evaluate the relationship between nanohole diameter and piezoelectric performance.The density of short circuit current of the assembled PENG reaches 313 nA cm^(-2),which is 1.57 times the output of PENG based on N doped 4H-SiC nanowire arrays.The enhancement can be attributed to the existence of nanohole sidewalls in NHAs.All-weather service capability of the PENG is verified after being treated at-80/80℃and 0%/100%RH for 50 days.The PENG is promising to be widely used in practice worldwide to harvest biomechanical energy and mechanical energy.展开更多
Dear Editor,Although effective vaccines and antiviral therapies are available,hepatitis B virus(HBV)infection is still a serious global health threat.Persistent HBV infection remains the principal cause of liver cirrh...Dear Editor,Although effective vaccines and antiviral therapies are available,hepatitis B virus(HBV)infection is still a serious global health threat.Persistent HBV infection remains the principal cause of liver cirrhosis and hepatocellular carcinoma(HCC).HBV is a small DNA virus,owning a~3.2 kb genome that encodes several proteins:viral DNA polymerase,core antigen(HBcAg),E antigen(HBeAg),three surface antigens(PreS1/PreS2/HBsAg),and a regulatory X protein(HBx)(Lamontagne et al.,2016).X protein,named for its lack of homology with any known proteins,is a 154 aa protein that plays an essential role in HBV biology and regulates the development of HCC(Yang et al.,2022).Although previous studies have strongly expanded our understanding of HBx,the regulation of HBx is not completely elucidated.展开更多
Continuous seawater electrolysis is efficient for green hydrogen production,but some key issues have been overlooked.For example,the accumulated to saturated NaCl in electrolyte is poison to cathode by covering its su...Continuous seawater electrolysis is efficient for green hydrogen production,but some key issues have been overlooked.For example,the accumulated to saturated NaCl in electrolyte is poison to cathode by covering its surface and available active sites.Herein we demonstrate Pt/NiFe Prussian blue analogue(Pt/NiFePBA)electrode can continuously catalyze hydrogen evolution effectively at−500 mA·cm^(−2)in a 6 M NaOH electrolyte containing saturated NaCl,without being impeded by the formation of NaCl crystals on the electrode surface,which is in distinct contrast to commercial electrodes.Experimental results indicate that Fe(CN)_(6)^(4−)spontaneously released by Pt/NiFePBA blocks the traditionally preferred basal plane growth of NaCl along{100}facets,but favors its growth along{110}basal plane.This alteration leads to an increased crystallization difficulty of NaCl near the electrode,rendering it halophobic(anti-NaCl precipitation)property.This investigation should shed light on general salt involving process besides the practical implementation of seawater electrolysis.展开更多
Copper-based catalysts play a pivotal role in CO_(2) electroreduction(CER)toward multi-carbon(C_(2+))products.However,achieving a high selectivity for C_(2+)products remains a formidable challenge.In this work,a facil...Copper-based catalysts play a pivotal role in CO_(2) electroreduction(CER)toward multi-carbon(C_(2+))products.However,achieving a high selectivity for C_(2+)products remains a formidable challenge.In this work,a facile electrochemical oxidation-reduction technique was developed to modulate the surface morphology of a copper foil using sulfur and oxygen as auxiliary atoms.Optimization of this approach resulted in an atomically reconstructed copper electrode(denoted as Cu-50)with a surface tensile strain of 1.1%and preferential exposure of Cu(100)facets.Cu-50 delivered remarkable Faradaic efficiencies(up to 72%)for C_(2+)products during CER,with a 53%selectivity for ethylene(10-fold higher than for a non-reconstructed Cu foil).This work guides the design of advanced copper-based catalysts that promote C-C coupling,demonstrating the potential of tailored copper structures for efficient conversion of CO_(2) to valuable C_(2+)products.展开更多
On January 7,2021,a 32-year-old returning employee arrived in Chengdu from Algeria via airplane and tested positive for coronavirus disease 2019(COVID-19)by nucleic acid tests.He was transferred to the designated hosp...On January 7,2021,a 32-year-old returning employee arrived in Chengdu from Algeria via airplane and tested positive for coronavirus disease 2019(COVID-19)by nucleic acid tests.He was transferred to the designated hospital for further diagnosis and treatment.The patient was diagnosed as a mild COVID-19 case on January 16.After medical treatment,this patient recovered and left the hospital on February 18.展开更多
On May 9,2022,3 local residents in Guang’an City,Sichuan Province,tested positive for severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)and were diagnosed as asymptomatic infections with coronavirus disease ...On May 9,2022,3 local residents in Guang’an City,Sichuan Province,tested positive for severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)and were diagnosed as asymptomatic infections with coronavirus disease 2019(COVID-19)in a local outbreak,and as of May 14,a total of 20 confirmed cases and 398 asymptomatic infections were reported.Whole genome sequencing was performed directly on the nasal and throat swab specimens from the initial three asymptomatic infected individuals using the Illumina MiSeq platform(Illumina,San Diego,CA,USA).The complete genome sequences of 3 SARSCoV-2 strains,named SC1215,SC1216,and SC1217,were obtained.The sequence of SC1217 has been deposited in the GISAID database(under the accession number EPI_ISL_12725020).展开更多
基金supported by the National Science Fund for Distinguished Young Scholars(No.52025041)the National Natural Science Foundation of China(Nos.51902020,51974021,and 52250091)+2 种基金the Fundamental Research Funds for the Central Universities of NO.FRF-TP-20-02C2This project is supported by the S tate Key Laboratory of Featured Metal Materials and Lifecycle Safety for Composite Structures,Guangxi University(Grant No.2021GXYSOF12)the Interdisciplinary Research Project for Young Teachers of USTB(Fundamental Research Funds for the Central Universities)(No.FRF-IDRY-21-028).
文摘Piezoelectric silicon carbide(SiC)has been quite attractive due to its superior chemical and physical properties as well as wide potential applications.However,the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified applications.Here,flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators(PENGs)and stress/temperature/light sensors.The open cir-cuit voltage(V_(oc))and the density of short circuit current(I_(sc))of the PENG based on the PVDF/5 wt%6H-SiC composite fiber films reach 28.94 V and 0.24μA cm^(-2),showing a significant improvement of 240%and 300%compared with that based on the pure PVDF films.The effect of 6H-SiC nanoparticles(NPs)on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element analysis.The stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding stimuli.This study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.
基金This work was supported by the National Science Fund for Distinguished Young Scholars(No.52025041)the National Natural Science Foundation of China(No.51974021,51902020,51904021)+2 种基金the Fundamental Research Funds for the Central Universities of NO.FRF-TP-18-045A1 and FRF-TP-19-004B2Zthe National Postdoctoral Program for Innovative Talents(BX20180034)This project is supported by open foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials,Guangxi University(Grant No.2021GXYSOF12).
文摘Ultra-stable piezoelectric nanogenerator(PENG)driven by environmental actuation sources with all-weather service capability is highly desirable.Here,the PENG based on N doped 4H-SiC nanohole arrays(NHAs)is proposed to harvest ambient energy under low/high temperature and relative humidity(RH)conditions.Finite element method simulation of N doped 4H-SiC NHAs in compression mode is developed to evaluate the relationship between nanohole diameter and piezoelectric performance.The density of short circuit current of the assembled PENG reaches 313 nA cm^(-2),which is 1.57 times the output of PENG based on N doped 4H-SiC nanowire arrays.The enhancement can be attributed to the existence of nanohole sidewalls in NHAs.All-weather service capability of the PENG is verified after being treated at-80/80℃and 0%/100%RH for 50 days.The PENG is promising to be widely used in practice worldwide to harvest biomechanical energy and mechanical energy.
基金funded by the National Science and Technology Innovation 2030 Major Project of China(No.2021ZD0203900)the Ministry of Science and Technology of China(No.2019YFA0802103)+3 种基金the National Natural Science Foundation of China(No.92253302)the Department of Science and Technology of Zhejiang Province(No.2021C03104)the Guangzhou Science Innovation and Development Program(No.201803010092)athe Shenzhen-Hong Kong Institute of Brain Science(No.NYKFKT2019006).
文摘Dear Editor,Although effective vaccines and antiviral therapies are available,hepatitis B virus(HBV)infection is still a serious global health threat.Persistent HBV infection remains the principal cause of liver cirrhosis and hepatocellular carcinoma(HCC).HBV is a small DNA virus,owning a~3.2 kb genome that encodes several proteins:viral DNA polymerase,core antigen(HBcAg),E antigen(HBeAg),three surface antigens(PreS1/PreS2/HBsAg),and a regulatory X protein(HBx)(Lamontagne et al.,2016).X protein,named for its lack of homology with any known proteins,is a 154 aa protein that plays an essential role in HBV biology and regulates the development of HCC(Yang et al.,2022).Although previous studies have strongly expanded our understanding of HBx,the regulation of HBx is not completely elucidated.
基金financially supported by the National Key Research and Development Program of China(No.2021YFA1502200,received by Y.K.)the National Natural Science Foundation of China(No.21935001,received by X.M.S.,No.22175012,received by D.J.Z.)+4 种基金the National Key Beijing Natural Science Foundation(No.Z210016,received by X.M.S.)Young Elite Scientists Sponsorship Program by CAST(No.2022QNRC001,received by D.J.Z.)Shenzhen Science and Technology Program(No.RCJC20231211090051085,received by Y.K.)Shenzhen Science and Technology Program(No.KJZD20230923115759014,received by Y.K.)the longterm subsidy mechanism from the Ministry of Finance and the Ministry of Education of China.
文摘Continuous seawater electrolysis is efficient for green hydrogen production,but some key issues have been overlooked.For example,the accumulated to saturated NaCl in electrolyte is poison to cathode by covering its surface and available active sites.Herein we demonstrate Pt/NiFe Prussian blue analogue(Pt/NiFePBA)electrode can continuously catalyze hydrogen evolution effectively at−500 mA·cm^(−2)in a 6 M NaOH electrolyte containing saturated NaCl,without being impeded by the formation of NaCl crystals on the electrode surface,which is in distinct contrast to commercial electrodes.Experimental results indicate that Fe(CN)_(6)^(4−)spontaneously released by Pt/NiFePBA blocks the traditionally preferred basal plane growth of NaCl along{100}facets,but favors its growth along{110}basal plane.This alteration leads to an increased crystallization difficulty of NaCl near the electrode,rendering it halophobic(anti-NaCl precipitation)property.This investigation should shed light on general salt involving process besides the practical implementation of seawater electrolysis.
基金supported by the National Key Research and Development Program of China(Grant No.2021YFA1502200)the Shenzhen Science and Technology Program(Nos.RCJC2023-1211090051085,KJZD20230923115759014,JCYJ20230807151159002)+3 种基金the National Natural Science Foundation of China(Grant No.21935001,22175012)the National Key Beijing Natural Science Foundation(Grant No.Z210016)the Young Elite Scientists Sponsorship Program by CAST(No.2022QNRC001)the Project of PetroChina Technology Management Department(No.2023ZZ1202).
文摘Copper-based catalysts play a pivotal role in CO_(2) electroreduction(CER)toward multi-carbon(C_(2+))products.However,achieving a high selectivity for C_(2+)products remains a formidable challenge.In this work,a facile electrochemical oxidation-reduction technique was developed to modulate the surface morphology of a copper foil using sulfur and oxygen as auxiliary atoms.Optimization of this approach resulted in an atomically reconstructed copper electrode(denoted as Cu-50)with a surface tensile strain of 1.1%and preferential exposure of Cu(100)facets.Cu-50 delivered remarkable Faradaic efficiencies(up to 72%)for C_(2+)products during CER,with a 53%selectivity for ethylene(10-fold higher than for a non-reconstructed Cu foil).This work guides the design of advanced copper-based catalysts that promote C-C coupling,demonstrating the potential of tailored copper structures for efficient conversion of CO_(2) to valuable C_(2+)products.
基金Sichuan Science and Technology Program(No.2020YFS0015,2020YFS0017,and 2020YFS 0581)the National Natural Science Foundation of China(No.82041033).
文摘On January 7,2021,a 32-year-old returning employee arrived in Chengdu from Algeria via airplane and tested positive for coronavirus disease 2019(COVID-19)by nucleic acid tests.He was transferred to the designated hospital for further diagnosis and treatment.The patient was diagnosed as a mild COVID-19 case on January 16.After medical treatment,this patient recovered and left the hospital on February 18.
基金Sichuan Science and Technology Program(2022ZDZX0017 and 2021YFQ0060).
文摘On May 9,2022,3 local residents in Guang’an City,Sichuan Province,tested positive for severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)and were diagnosed as asymptomatic infections with coronavirus disease 2019(COVID-19)in a local outbreak,and as of May 14,a total of 20 confirmed cases and 398 asymptomatic infections were reported.Whole genome sequencing was performed directly on the nasal and throat swab specimens from the initial three asymptomatic infected individuals using the Illumina MiSeq platform(Illumina,San Diego,CA,USA).The complete genome sequences of 3 SARSCoV-2 strains,named SC1215,SC1216,and SC1217,were obtained.The sequence of SC1217 has been deposited in the GISAID database(under the accession number EPI_ISL_12725020).
