Separating bulk and surface processes in NiOxelectrocatalysts for water oxidation

被引：40

作者：

Corby, Sacha ^{[1
,2
]}

Tecedor, Miguel-Garcia ^{[3
]}

Tengeler, Sven ^{[4
]}

Steinert, Celine ^{[4
]}

Moss, Benjamin ^{[1
,2
]}

Mesa, Camilo A. ^{[1
,2
]}

Heiba, Hany F. ^{[5
]}

Wilson, Anna A. ^{[1
,2
]}

Kaiser, Bernhard ^{[4
]}

Jaegermann, Wolfram ^{[4
]}

Francas, Laia ^{[1
,2
]}

Gimenez, Sixto ^{[3
]}

Durrant, James R. ^{[1
,2
]}

机构：

[1] Imperial Coll London, Dept Chem, London SW7 2AZ, England

[2] Imperial Coll London, Ctr Plast Elect, London SW7 2AZ, England

[3] Univ Jaume 1, Inst Adv Mat INAM, Castellon de La Plana 12071, Spain

[4] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt, Germany

[5] Imperial Coll London, Earth Sci & Engn, London SW7 2AZ, England

来源：

SUSTAINABLE ENERGY & FUELS | 2020年 / 4卷 / 10期

关键词：

OXYGEN EVOLUTION REACTION; NICKEL-OXIDE; ELECTROCHEMICAL EVOLUTION; THIN-FILMS; FE; CATALYSTS; ELECTROCATALYSTS; NI; ELECTROLYTE; REDOX;

D O I：

10.1039/d0se00977f

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：

Nickel oxide-based catalysts currently represent the state of the art in electrochemical water oxidation in alkaline pH. However, much of their functionality remains poorly understood, particularly regarding catalytically active sites and mechanism. Herein, we conduct a thickness dependent study of sputter deposited NiO(x)films by electrochemical impedance spectroscopy and spectroelectrochemistry in order to differentiate bulk oxidation from catalytic activation. We find that while catalytic activation occurs throughout the film bulk, only the upper <= 5 nm of these films are able to participate in the water oxidation reaction, a result that may be critical in the design of next generation co-catalysts to maximise performance and minimise light absorption losses.

引用

页码：5024 / 5030

页数：7

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