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Main Title: Experimental Activity Descriptors for Iridium-based Catalysts for the Electrochemical Oxygen Evolution Reaction (OER)
Author(s): Spöri, Camillo Wolfgang
Briois, Pascal
Nong, Hong Nhan
Reier, Tobias
Billard, Alain
Kühl, Stefanie
Teschner, Detre
Strasser, Peter
Type: Article
Is Part Of: 10.14279/depositonce-8601
Language Code: en
Abstract: Recent progress in the activity improvement of anode catalysts for acidic electrochemical water splitting was largely achieved through empirical studies of iridium-based bimetallic oxides. However, practical, experimentally accessible, yet general predictors of catalytic OER activity are lacking. This study investigates iridium and iridium-nickel thin film model electrocatalysts for the OER and identifies a set of general ex situ properties that allow the reliable prediction of their OER activity. Well defined Ir-based catalysts of various chemical nature and composition were synthesized by magnetron sput-tering. Correlation of physico-chemical and electrocatalytic properties revealed two experimental OER activity descriptors that are able to predict trends in the OER activity of unknown Ir based catalyst systems. More specifically, our study demonstrates that the IrIII+ and OH-surface concentration of the oxide catalyst constitute closely correlated, and generally applicable OER activity predictors. Based on these, an experimental volcano relationship of Ir-based OER electrocatalysts is presented and discussed.
Issue Date: 13-Jun-2019
Date Available: 19-Aug-2019
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Subject(s): electrolysis
figures of merit
water splitting
catalyst design
volcano relationship
oxide formation and growth
Journal Title: ACS catalysis
Publisher: American Chemical Society
Publisher Place: Washington, DC
Volume: 9
Issue: 8
Publisher DOI: 10.1021/acscatal.9b00648
Page Start: 6653
Page End: 6663
EISSN: 2155-5435
Appears in Collections:FG Technische Chemie » Publications

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