Ultrahigh Energy and Power Density in Ni-Zn Aqueous Battery via Superoxide-Activated Three-Electron Transfer  

作　　者：Yixue Duan Bolong Li Kai Yang Zheng Gong Xuqiao Peng Liang He Derek Ho 

机构地区：[1]School of Mechanical Engineering,State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,People’s Republic of China [2]Department of Materials Science and Engineering,City University of Hong Kong,Kowloon,Hong Kong 999077,People’s Republic of China [3]Hong Kong Centre for Cerebro-Cardiovascular Health Engineering,Hong Kong Science Park,Hong Kong 999077,People’s Republic of China [4]School of Mechanical Engineering,Sichuan University,Chengdu 610065,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第4期63-76,共14页纳微快报(英文版)

基　　金：supported by InnoHK Project at Hong Kong Centre for Cerebro-cardiovascular Health Engineering (COCHE);City University of Hong Kong (7006108)。

摘　　要：Aqueous Ni-Zn microbatteries are safe,reliable and inexpensive but notoriously suffer from inadequate energy and power densities.Herein,we present a novel mechanism of superoxide-activated Ni substrate that realizes the redox reaction featuring three-electron transfers(Ni↔Ni3+).The superoxide activates the direct redox reaction between Ni substrate and KNiO_(2)by lowering the reaction Gibbs free energy,supported by in-situ Raman and density functional theory simulations.The prepared chronopotentiostatic superoxidation-activated Ni(CPS-Ni)electrodes exhibit an ultrahigh capacity of 3.21 mAh cm^(-2)at the current density of 5 mA cm^(-2),nearly 8 times that of traditional one-electron processes electrodes.Even under the ultrahigh 200 mA cm^(-2)current density,the CPS-Ni electrodes show 86.4%capacity retention with a Columbic efficiency of 99.2%after 10,000 cycles.The CPS-Ni||Zn microbattery achieves an exceptional energy density of 6.88 mWh cm^(-2)and power density of 339.56 mW cm^(-2).Device demonstration shows that the power source can continuously operate for more than 7 days in powering the sensing and computation intensive practical application of photoplethysmographic waveform monitoring.This work paves the way to the development of multi-electron transfer mechanisms for advanced aqueous Ni-Zn batteries with high capacity and long lifetime.

关 键 词：Superoxide Multiple electron transfer Ni aqueous battery AIoT power source Wearable health monitoring 

分 类 号：O64[理学—物理化学]