Rechargeable aqueous zinc-ion batteries are recently gaining incremental attention because of low cost and material abundance, but their development is plagued by limited choice of cathode materials with satisfactory ...Rechargeable aqueous zinc-ion batteries are recently gaining incremental attention because of low cost and material abundance, but their development is plagued by limited choice of cathode materials with satisfactory cycling performance. Here, we report a porous V2O5 nanofibers cathode with high Znstorage performance in an aqueous Zn(CF3SO3)2 electrolyte. We propose a reaction mechanism based on phase transition from orthorhombic V2O5 to zinc pyrovanadate on first discharging and reversible Zn^2+ (de)intercalation in the open-structured hosts during subsequent cycling. This open and stable architecture enables a high reversible capacity of 319 mAh g^-1 at 20 mAg^-1 and a capacity retention of 81% over 500 cycles. The remarkable electrochemical performance makes V2O5 a promising cathode for aqueous zinc-ion batteries.展开更多
Supported Pd/VSiO catalyst and Ag/SiO 2 TiO 2/K M composite ceramic membrane tube have been prepared. Membrane catalytic reaction of C 2H 6 oxydehydrogenation to ethene by carbon dioxide has been investigated, and the...Supported Pd/VSiO catalyst and Ag/SiO 2 TiO 2/K M composite ceramic membrane tube have been prepared. Membrane catalytic reaction of C 2H 6 oxydehydrogenation to ethene by carbon dioxide has been investigated, and thermodynamic property and kinetic regulation of the inorganic membrane catalytic reaction have been discussed to supply some experimental bases to optimize the membrane reactor design and the operation of the inorganic membrane reaction.展开更多
基金financially supported by Tianjin Natural Science Foundation (No. 18JCZDJC31100)MOST(2017YFA0206700 and 2016YFA0202503)+1 种基金MOE(B12015)the Fundamental Research Funds for the Central Universities
文摘Rechargeable aqueous zinc-ion batteries are recently gaining incremental attention because of low cost and material abundance, but their development is plagued by limited choice of cathode materials with satisfactory cycling performance. Here, we report a porous V2O5 nanofibers cathode with high Znstorage performance in an aqueous Zn(CF3SO3)2 electrolyte. We propose a reaction mechanism based on phase transition from orthorhombic V2O5 to zinc pyrovanadate on first discharging and reversible Zn^2+ (de)intercalation in the open-structured hosts during subsequent cycling. This open and stable architecture enables a high reversible capacity of 319 mAh g^-1 at 20 mAg^-1 and a capacity retention of 81% over 500 cycles. The remarkable electrochemical performance makes V2O5 a promising cathode for aqueous zinc-ion batteries.
文摘Supported Pd/VSiO catalyst and Ag/SiO 2 TiO 2/K M composite ceramic membrane tube have been prepared. Membrane catalytic reaction of C 2H 6 oxydehydrogenation to ethene by carbon dioxide has been investigated, and thermodynamic property and kinetic regulation of the inorganic membrane catalytic reaction have been discussed to supply some experimental bases to optimize the membrane reactor design and the operation of the inorganic membrane reaction.
