Superstructured Carbon with Enhanced Kinetics for Zinc‐Air Battery and Self‐Powered Overall Water Splitting

Author:

Wei Jiamin1,Lou Jiali1,Hu Weibo2,Song Xiaokai1,Wang Haifeng3,Yang Yang1,Zhang Yaqi1,Jiang Ziru1,Mei Bingbao4,Wang Liangbiao1,Yang Tinghai1,Wang Qing5,Li Xiaopeng3ORCID

Affiliation:

1. Institute of Advanced Functional Materials for Energy School of Chemistry and Chemical Engineering Jiangsu University of Technology Changzhou 213001 China

2. School of New Energy Ningbo University of Technology Ningbo 315336 China

3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Materials Science and Engineering Donghua University Shanghai 201620 China

4. Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201800 PR China

5. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Changzhou University Changzhou 213164 China

Abstract

AbstractThe present study proposes a novel engineering concept for the customization of functionality and construction of superstructure to fabricate 2D monolayered N‐doped carbon superstructure electrocatalysts decorated with Co single atoms or Co2P nanoparticles derived from 2D bimetallic ZnCo‐ZIF superstructure precursors. The hierarchically porous carbon superstructure maximizes the exposure of accessible active sites, enhances electron/mass transport efficiency, and accelerates reaction kinetics simultaneously. Consequently, the Co single atoms embedded N‐doped carbon superstructure (Co‐NCS) exhibits remarkable catalytic activity toward oxygen reduction reaction, achieving a half‐wave potential of 0.886 V versus RHE. Additionally, the Co2P nanoparticles embedded N‐doped carbon superstructure (Co2P‐NCS) demonstrates high activity for both oxygen evolution reaction and hydrogen evolution reaction, delivering low overpotentials of 292 mV at 10 mA cm−2 and 193 mV at 10 mA cm−2 respectively. Impressively, when employed in an assembled rechargeable Zn‐air battery, the as‐prepared 2D carbon superstructure electrocatalysts exhibit exceptional performance with a peak power density of 219 mW cm−2 and a minimal charge/discharge voltage gap of only 1.16 V at 100 mA cm−2. Moreover, the cell voltage required to drive an overall water‐splitting electrolyzer at a current density of 10 mA cm−2 is merely 1.69 V using these catalysts as electrodes.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Publisher

Wiley

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