Interface Engineering a High Content of Co3+ Sites on Co3O4 Nanoparticles to Boost Acidic Oxygen Evolution

被引：4

作者：

Liu, Ziyi ^{[1
]}

Ji, Qianqian ^{[1
]}

Li, Na ^{[1
]}

Tang, Bing ^{[1
]}

Lv, Liyang ^{[1
]}

Liu, Yuying ^{[1
]}

Wang, Huijuan ^{[2
]}

Hu, Fengchun ^{[1
]}

Cai, Liang ^{[3
]}

Yan, Wensheng ^{[1
]}

机构：

[1] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China

[2] Univ Sci & Technol China, Expt Ctr Engn & Mat Sci, Hefei 230026, Peoples R China

[3] Tokyo Inst Technol, MDX Res Ctr Element Strategy, Int Res Frontiers Initiat, Yokohama 2268503, Japan

来源：

LANGMUIR | 2023年 / 39卷 / 46期

基金：

中国国家自然科学基金;

关键词：

OXIDATION; COBALT; WATER; CATALYST;

D O I：

10.1021/acs.langmuir.3c02171

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Non-noble metal oxides have emerged as potential candidate electrocatalysts for acidic oxygen evolution reactions (OERs) due to their earth abundance; however, improving their catalytic activity and stability simultaneously in strong acidic electrolytes is still a major challenge. In this work, we report Co3O4@carbon core-shell nanoparticles on 2D graphite sheets (Co3O4@C-GS) as mixed-dimensional hybrid electrocatalysts for acidic OER. The obtained Co3O4@C-GS catalyst exhibits a low overpotential of 350 mV and maintains stability for 20 h at a current density of 10 mA cm(-2) in H2SO4 (pH = 1) electrolyte. X-ray photoelectron and X-ray absorption spectroscopies illustrate that the higher content of Co3+ sites boosts acidic OER. Operando Raman spectroscopy reveals that the catalytic stability of Co3O4@C nanoparticles during the acidic OER is enhanced by the introduction of graphite sheets. This interface engineering of non-noble metal sites with high valence states provides an efficient approach to boost the catalytic activity and enhance the stability of noble-metal-free electrocatalysts for acidic OER.

引用

页码：16415 / 16421

页数：7