Aqueous metal-H_(2)O_(2)cells are emerging as power batteries because of their large theoretical energy densities and multiple application scenarios,especially in underwater environments.However,the peak power densiti...Aqueous metal-H_(2)O_(2)cells are emerging as power batteries because of their large theoretical energy densities and multiple application scenarios,especially in underwater environments.However,the peak power densities are less than 300 mW cm^(-2)for most reported metal-H_(2)O_(2)cells based on Mg/Al or their alloys due to the self-corrosion.Herein,we reported a Zn-H_(2)O_(2)cell with ultrafine bean-pod-like ZnCo/N-doped electrocatalysts that were synthesized via multifunctional single-cell-chain biomass.The electrocatalyst provides abundant active sites on the crinkly interface and offers a shortened pathway for electron/ion transfer due to the desired root-like carbon nanotube(CNT)arrays.Therefore,the optimized electrocatalyst exhibited outstanding oxygen reduction reaction(ORR)activity,with high E_(1/2)(0.90 V)and E_(onset)(1.01 V)values.More importantly,Zn-H_(2)O_(2)batteries achieve a record-breaking peak-power density of 510 mW cm^(-2)and a high specific energy density of 953 Wh kg^(-1).展开更多
基金supported by the National Natural Science Foundation of China(U1832136 and 21303038)the Intelligent Manufacturing Institute of Hefei University of Technology Project for Scientific and Technological Achievements+1 种基金the Fundamental Research Funds for the Central Universities(JZ2020HGQA0149,PA2022GDGP0029 and PA2023GDGP0042)the Anhui Natural Science Foundation Project(2308085ME140)。
文摘Aqueous metal-H_(2)O_(2)cells are emerging as power batteries because of their large theoretical energy densities and multiple application scenarios,especially in underwater environments.However,the peak power densities are less than 300 mW cm^(-2)for most reported metal-H_(2)O_(2)cells based on Mg/Al or their alloys due to the self-corrosion.Herein,we reported a Zn-H_(2)O_(2)cell with ultrafine bean-pod-like ZnCo/N-doped electrocatalysts that were synthesized via multifunctional single-cell-chain biomass.The electrocatalyst provides abundant active sites on the crinkly interface and offers a shortened pathway for electron/ion transfer due to the desired root-like carbon nanotube(CNT)arrays.Therefore,the optimized electrocatalyst exhibited outstanding oxygen reduction reaction(ORR)activity,with high E_(1/2)(0.90 V)and E_(onset)(1.01 V)values.More importantly,Zn-H_(2)O_(2)batteries achieve a record-breaking peak-power density of 510 mW cm^(-2)and a high specific energy density of 953 Wh kg^(-1).
