Ultrathin Cobalt Oxide Layers as Electrocatalysts for High-Performance Flexible Zn-Air Batteries

Advanced Materials
Tianpei ZhouYi Xie

Abstract

Synergistic improvements in the electrical conductivity and catalytic activity for the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) are of paramount importance for rechargeable metal-air batteries. In this study, one-nanometer-scale ultrathin cobalt oxide (CoOx ) layers are fabricated on a conducting substrate (i.e., a metallic Co/N-doped graphene substrate) to achieve superior bifunctional activity in both the ORR and OER and ultrahigh output power for flexible Zn-air batteries. Specifically, at the atomic scale, the ultrathin CoOx layers effectively accelerate electron conduction and provide abundant active sites. X-ray absorption spectroscopy reveals that the metallic Co/N-doped graphene substrate contributes to electron transfer toward the ultrathin CoOx layer, which is beneficial for the electrocatalytic process. The as-obtained electrocatalyst exhibits ultrahigh electrochemical activity with a positive half-wave potential of 0.896 V for ORR and a low overpotential of 370 mV at 10 mA cm-2 for OER. The flexible Zn-air battery built with this catalyst exhibits an ultrahigh specific power of 300 W gcat-1 , which is essential for portable devices. This work provides a new design pathway for electrocatalysts ...Continue Reading

References

Dec 1, 2010·Physical Chemistry Chemical Physics : PCCP·María Paz Fernández-GarcíaJesús A Blanco
Sep 11, 2012·Journal of the American Chemical Society·Yongye LiangHongjie Dai
May 9, 2013·Nature Communications·Yanguang LiHongjie Dai
May 16, 2014·Journal of the American Chemical Society·Changlin ZhangZhenmeng Peng
Sep 14, 2016·Advanced Materials·Yi JiaXiangdong Yao
Jun 13, 2017·ACS Nano·Fandi NingXiaochun Zhou
Feb 7, 2018·ACS Applied Materials & Interfaces·Renjie WeiJohnny C Ho

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Citations

Jun 26, 2020·Advanced Materials·Longsheng ZhangHuisheng Peng
May 18, 2021·Chemical Science·Menglei YuanGuangjin Zhang
Nov 26, 2020·ACS Applied Materials & Interfaces·Shengxiang QuWenbin Hu

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