Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 1, Pages 46-55Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.10.179
Keywords
Oxygen evolution reaction; Mixed RuxIr1-xO2 nano-catalyst; Acidic media; Alkaline media; Wet-chemical synthesis
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Funding
- Singapore Ministry of Education Tier 1 Grant [RG131/14]
- Singapore Ministry of Education Tier 2 Grant [MOE2015-T21-020]
- Singapore National Research Foundation under its Campus for Research Excellence And Technological Enterprise (CREATE) program
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IrO2 and RuO2 are known as two of the best catalysts for the oxygen evolution reaction (OER) in acidic electrolyte. It is reported that RuO2 has higher OER catalytic activity, while IrO2 possesses better electrochemical stability during the OER process in acid. Therefore, many combined strategies have been proposed to utilize the advantages of both IrO2 and RuO2 catalysts in water electrolysis applications. In this article we describe how, by tuning the wet-chemical synthesis process in which the Ir precursor is added after the synthesis of RuO2 nanoparticles (NPs) (two-step), the Ru0.5Ir0.5O2 NPs have been synthesized to improve the OER catalytic activity in both acidic and alkaline media. In detail, the specific OER activity of the Ru0.5Ir0.5O2 NPs (with a particle size of ca. 10 nm) is 48.9 mu A cm(-2) at an overpotential eta = 0.22 V (vs. RHE) and 21.7 mu A cm(-2) at eta = 0.27 V (vs. RHE) in 0.1 M HClO4 and 0.1 M KOH, respectively. These values are higher than those for the one-step (Ir-0.5+Ru-0.5)O-2 NPs (obtained by contemporaneously adding both Ru and Ir precursors), which are 19.5 and 15.5 mu A cm(-2) at the same measuring conditions, respectively. Additionally, with more IrO2 component distributed on the particle surface, the two-step Ru0.5Ir0.5O2 NPs show better OER catalytic stability than RuO2 NPs. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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