An Ultrastable Bifunctional Electrocatalyst Derived from a Co2+-Anchored Covalent-Organic Framework for High-Efficiency ORR/OER and Rechargeable Zinc-Air Battery

被引：11

作者：

Li, Mengfei ^{[1
]}

Yang, QianQian ^{[1
]}

Fan, Lili ^{[1
]}

Dai, Xiaojie ^{[1
]}

Kang, Zixi ^{[1
]}

Wang, Rongming ^{[1
]}

Sun, Daofeng ^{[1
]}

机构：

[1] China Univ Petr East China, Sch Mat Sci & Engn, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2023年 / 15卷 / 33期

基金：

中国国家自然科学基金;

关键词：

covalent-organic frameworks; bifunctional electrocatalyst; oxygen reduction; oxygen evolution; zinc-airbattery; DOPED CARBON; OXYGEN ELECTROCATALYSIS; COBALT; SITES;

D O I：

10.1021/acsami.3c09114

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Itremains a great challenge to develop alternative electrocatalystswith high stability for the oxygen reduction reaction (ORR) and oxygenevolution reaction (OER). Herein, a bifunctional electrocatalyst composedof hollow CoO x (Co3O4/CoO) nanoparticles embedded in lamellar carbon nanofibers is derivedfrom a Co2+-anchored covalent-organic framework.The as-fabricated electrocatalyst (CoO x @NC-800) exhibits a half-wave potential (E (1/2)) of 0.89 V with ultrahigh long-term stability (100% current retentionafter 3000 CV cycles). Together with promising OER performance, theCoO( x )@NC-800 based reversible Zn-airbattery displays a small potential gap (0.70 V), superior to thatof the commercial 20% Pt/C + RuO2. The density functionaltheory (DFT) calculations reveal that the remarkable electrocatalyticperformance and stability of CoO x @NC-800are attributed to the optimized adsorption of the *OOH intermediateand reduced free energy of the potential-limiting step. This studyestablishes the functionalization of COF structure for fabricationof high-performance carbon-based electrocatalysts.

引用

页码：39448 / 39460

页数：13

共 69 条

[1] Controllable tuning of Fe-N nanosheets by Co substitution for enhanced oxygen evolution reaction [J].