锌
纳米孔
碱性电池
材料科学
电化学
电极
电解质
氢氧化锌
氢氧化物
氧化镍
镍
过渡金属
化学工程
无机化学
氧化物
纳米技术
冶金
化学
催化作用
物理化学
工程类
生物化学
作者
Liangyu Li,Yung Chak Anson Tsang,Diwen Xiao,Guoyin Zhu,Chunyi Zhi,Qing Chen
标识
DOI:10.1038/s41467-022-30616-w
摘要
Abstract Secondary alkaline Zn batteries are cost-effective, safe, and energy-dense devices, but they are limited in rechargeability. Their short cycle life is caused by the transition between metallic Zn and ZnO, whose differences in electronic conductivity, chemical reactivity, and morphology undermine uniform electrochemical reactions and electrode structural stability. To circumvent these issues, here we propose an electrode design with bi-continuous metallic zinc nanoporous structures capable of stabilizing the electrochemical transition between metallic Zn and ZnO. In particular, via in situ optical microscopy and electrochemical impedance measurements, we demonstrate the kinetics-controlled structural evolution of Zn and ZnO. We also tested the electrochemical energy storage performance of the nanoporous zinc electrodes in alkaline zinc-nickel oxide hydroxide (NiOOH) and zinc-air (using Pt/C/IrO 2 -based air-electrodes) coin cell configurations. The Zn | |NiOOH cell delivers an areal capacity of 30 mAh/cm 2 at 60% depth of discharging for 160 cycles, and the Zn | |Pt/C/IrO 2 air cell demonstrates 80-hour stable operation in lean electrolyte condition.
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