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Type: Journal article
Title: Transition-metal-doped ruIr bifunctional nanocrystals for overall water splitting in acidic environments
Author: Shan, J.
Ling, T.
Davey, K.
Zheng, Y.
Qiao, S.
Citation: Advanced Materials, 2019; 31(17):e1900510
Publisher: Wiley
Issue Date: 2019
ISSN: 0935-9648
Statement of
Jieqiong Shan, Tao Ling, Kenneth Davey, Yao Zheng, Shi‐Zhang Qiao
Abstract: The establishment of electrocatalysts with bifunctionality for efficient oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in acidic environments is necessary for the development of proton exchange membrane (PEM) water electrolyzers for the production of clean hydrogen fuel. RuIr alloy is considered to be a promising electrocatalyst because of its favorable OER performance and potential for HER. Here, the design of a bifunctional electrocatalyst with greatly boosted water-splitting performance from doping RuIr alloy nanocrystals with transition metals that modify electronic structure and binding strength of reaction intermediates is reported. Significantly, Co-RuIr results in small overpotentials of 235 mV for OER and 14 mV for HER (@ 10 mA cm-2 current density) in 0.1 m HClO4 media. Therefore a cell voltage of just 1.52 V is needed for overall water splitting to produce hydrogen and oxygen. More importantly, for a series of M-RuIr (M = Co, Ni, Fe), the catalytic activity dependence at fundamental level on the chemical/valence states is used to establish a novel composition-activity relationship. This permits new design principles for bifunctional electrocatalysts.
Keywords: Acidic environment; bifunctional electrocatalysis; composition-activity relationship; overall water splitting; transition metal doping
Rights: © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
RMID: 0030110138
DOI: 10.1002/adma.201900510
Grant ID:
Appears in Collections:Chemical Engineering publications

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