Increasing the Formation of Active Sites on Highly Crystalline Co Branched Nanoparticles for Improved Oxygen Evolution Reaction Electrocatalysis

被引：7

作者：

Myekhlai, Munkhshur ^{[1
]}

Benedetti, Tania M. ^{[1
]}

Gloag, Lucy ^{[1
]}

Goncales, Vinicius R. ^{[1
]}

Cheong, Soshan ^{[2
]}

Chen, Hsiang-Sheng ^{[1
]}

Gooding, J. Justin ^{[1
,3
]}

Tilley, Richard D. ^{[1
,2
]}

机构：

[1] Univ New South Wales, Sch Chem, Sydney, NSW 2052, Australia

[2] Univ New South Wales, Mark Wainwright Analyt Ctr, Electron Microscope Unit, Sydney, NSW 2052, Australia

[3] Univ New South Wales, Australian Res Council Ctr Excellence Convergent, Sydney, NSW 2052, Australia

来源：

CHEMCATCHEM | 2020年 / 12卷 / 11期

基金：

澳大利亚研究理事会;

关键词：

Cobalt oxide; Electrocatalysis; Nanoparticles; Oxygen evolution reaction; Surface oxide; WATER-OXIDATION; COBALT OXIDE; SURFACE-AREA; VACANCIES; NANOCRYSTALS; STATE; AU; IR;

D O I：

10.1002/cctc.202000224

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electrocatalysis of the oxygen evolution reaction (OER) at the surface of oxidized metal electrocatalysts is highly dependent on the structure and composition of the surface oxide. Here, Au core- Co branched nanoparticles were synthesized using a cubic-core hexagonal-branch growth approach in a slow reductive solution synthesis, resulting in highly crystalline metallic hcp Co branches. Electrochemical surface oxidation of the Co branched nanoparticles resulted in formation of Co(OH)(2) that enable the formation of a higher number of active sites under OER conditions compared to Co3O4. Differently from polycrystalline spherical Au-Co core-shell nanoparticles, the oxidized structure on the Co branched nanoparticle surface is retained with electrochemical cycling, resulting in improved OER activity and stability.

引用

页码：3126 / 3131

页数：6

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