A breakthrough in advancing power density and stability of carbon-based supercapacitors is trapped by inefficient pore structures of electrode materials.Herein,an ultramicroporous carbon with ultrahigh integrated capa...A breakthrough in advancing power density and stability of carbon-based supercapacitors is trapped by inefficient pore structures of electrode materials.Herein,an ultramicroporous carbon with ultrahigh integrated capacitance fabricated via one-step carbonization/activation of dense bacterial cellulose(BC)precursor followed by nitrogen/sulfur dual doping is reported.The microporous carbon possesses highly concentrated micropores(~2 nm)and a considerable amount of sub-micropores(<1 nm).The unique porous structure provides high specific surface area(1554 m^2 g^-1)and packing density(1.18 g cm^-3).The synergistic effects from the particular porous structure and optimal doping effectively enhance ion storage and ion/electron transport.As a result,the remarkable specific capacitances,including ultrahigh gravimetric and volumetric capacitances(430 F g^-1 and 507 F cm^-3 at 0.5 A g^-1),and excellent cycling and rate stability even at a high current density of 10 A g^-1(327 F g^-1 and 385 F cm^-3)are realized.Via compositing the porous carbon and BC skeleton,a robust all-solid-state cellulose-based supercapacitor presents super high areal energy density(~0.77 mWh cm^-2),volumetric energy density(~17.8 W L^-1),and excellent cyclic stability.展开更多
The novel coronavirus(2019 novel coronavirus,2019-nCoV) is a newly emerged virus.Therefore,the nucleic acid detection technology and serum immunological detection technology established urgently in emergencies have ce...The novel coronavirus(2019 novel coronavirus,2019-nCoV) is a newly emerged virus.Therefore,the nucleic acid detection technology and serum immunological detection technology established urgently in emergencies have certain defects inevitably.The efficiency of nucleic acid and antibody detection varies at different stages of disease progression of the novel coronavirus disease(COVID-19).If the two can be used in combination and the results of the analysis can be comprehensively judged,they can be combined to monitor the viral load and disease progress better and improve the diagnostic efficiency.Based on the author’s application experience,this article analyzes and interprets eight common modes of combined detection of nucleic acids and specific antibodies in order to provide a reference for the clinical diagnosis and treatment of COVID-19.展开更多
The electrochemical properties of catalyst materials are highly dependent on the materials structure and architecture. Herein, nano-on-micro Cu electrodes are fabricated by growing Cu microcrystals on Ni foam substrat...The electrochemical properties of catalyst materials are highly dependent on the materials structure and architecture. Herein, nano-on-micro Cu electrodes are fabricated by growing Cu microcrystals on Ni foam substrate, followed by introducing Cu nanocrystals onto the surface of the Cu microcrystals. The introduction of Cu nanocrystals onto the surface of Cu microcrystals is shown to dramatically increase the electrochemically active surface area and thus significantly enhances the catalytic activity of the catalyst electrode towards electro-oxidation of hydrazine. The onset potential （-1.04 V vs. AglAgCI） of the nano-on-micro Cu electrode is lower than those of the reported Cu-based catalysts under similar testing conditions, and a current density of 16 mA-cm-2, which is 2 times that of the microsized Cu electrode, is achieved at a potential of -0.95 V vs. Ag/AgCh Moreover, the nano-on-micro Cu electrode demonstrates good long-term stability.展开更多
文摘A breakthrough in advancing power density and stability of carbon-based supercapacitors is trapped by inefficient pore structures of electrode materials.Herein,an ultramicroporous carbon with ultrahigh integrated capacitance fabricated via one-step carbonization/activation of dense bacterial cellulose(BC)precursor followed by nitrogen/sulfur dual doping is reported.The microporous carbon possesses highly concentrated micropores(~2 nm)and a considerable amount of sub-micropores(<1 nm).The unique porous structure provides high specific surface area(1554 m^2 g^-1)and packing density(1.18 g cm^-3).The synergistic effects from the particular porous structure and optimal doping effectively enhance ion storage and ion/electron transport.As a result,the remarkable specific capacitances,including ultrahigh gravimetric and volumetric capacitances(430 F g^-1 and 507 F cm^-3 at 0.5 A g^-1),and excellent cycling and rate stability even at a high current density of 10 A g^-1(327 F g^-1 and 385 F cm^-3)are realized.Via compositing the porous carbon and BC skeleton,a robust all-solid-state cellulose-based supercapacitor presents super high areal energy density(~0.77 mWh cm^-2),volumetric energy density(~17.8 W L^-1),and excellent cyclic stability.
文摘The novel coronavirus(2019 novel coronavirus,2019-nCoV) is a newly emerged virus.Therefore,the nucleic acid detection technology and serum immunological detection technology established urgently in emergencies have certain defects inevitably.The efficiency of nucleic acid and antibody detection varies at different stages of disease progression of the novel coronavirus disease(COVID-19).If the two can be used in combination and the results of the analysis can be comprehensively judged,they can be combined to monitor the viral load and disease progress better and improve the diagnostic efficiency.Based on the author’s application experience,this article analyzes and interprets eight common modes of combined detection of nucleic acids and specific antibodies in order to provide a reference for the clinical diagnosis and treatment of COVID-19.
基金Z.P. acknowledges the support from the National Science Foundation （DMR1308577）. X.Y. thanks the funds provided by the University of Missouri-Kansas City, School of Graduate Studies.
文摘The electrochemical properties of catalyst materials are highly dependent on the materials structure and architecture. Herein, nano-on-micro Cu electrodes are fabricated by growing Cu microcrystals on Ni foam substrate, followed by introducing Cu nanocrystals onto the surface of the Cu microcrystals. The introduction of Cu nanocrystals onto the surface of Cu microcrystals is shown to dramatically increase the electrochemically active surface area and thus significantly enhances the catalytic activity of the catalyst electrode towards electro-oxidation of hydrazine. The onset potential （-1.04 V vs. AglAgCI） of the nano-on-micro Cu electrode is lower than those of the reported Cu-based catalysts under similar testing conditions, and a current density of 16 mA-cm-2, which is 2 times that of the microsized Cu electrode, is achieved at a potential of -0.95 V vs. Ag/AgCh Moreover, the nano-on-micro Cu electrode demonstrates good long-term stability.
