摘要
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).
水系金属-H_(2)O_(2)电池作为新兴的动力电池,因其理论能量密度大,在各种应用领域受到关注,特别是水下环境.然而,由于金属的自腐蚀现象,大多数基于Mg/Al或其合金的金属-H_(2)O_(2)电池的峰值功率密度小于300 mW cm^(-2).本文报道了一种基于多功能单细胞链生物质合成超细豆荚状ZnCo/N掺杂电催化剂的方法,并成功应用于高功率Zn-H_(2)O_(2)电池.电催化剂在皱褶界面上提供了丰富的催化活性位点,并且,由于采用的根状碳纳米管阵列,缩短了电子/离子转移路径.因此,优化后的电催化剂表现出优异的ORR活性,具有较高的E_(1/2)(0.90 V)和E_(onset)(1.01 V)值.更重要的是,Zn-H_(2)O_(2)电池实现了创纪录的510mWcm^(-2)的最大功率密度和953 Wh kg^(-1)的高比能密度.
作者
Meng Zhou
Kui Fu
Yihai Xing
Jianling Liu
Fancheng Meng
Xiangfeng Wei
Jiehua Liu
周猛;符奎;邢沂海;刘建灵;孟凡成;魏香凤;刘节华(Future Energy Laboratory,School of Materials Science and Engineering,Hefei University of Technology,Hefei,230009,China;Key Laboratory of Advanced Functional Materials and Devices of Anhui Province,Hefei,230009,China;Engineering Research Center of High-Performance Copper Alloy Materials and Processing,Ministry of Education,Hefei,230009,China)
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
the Fundamental Research Funds for the Central Universities(JZ2020HGQA0149,PA2022GDGP0029 and PA2023GDGP0042)
the Anhui Natural Science Foundation Project(2308085ME140)。
