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Enhanced Activity for Oxygen Evolution Reaction of Nanoporous IrNi thin film Formed by Electrochemical Selective Etching Process

Title
Enhanced Activity for Oxygen Evolution Reaction of Nanoporous IrNi thin film Formed by Electrochemical Selective Etching Process
Authors
KIM, YONG TAE
Date Issued
2019-12
Publisher
The Korean Electrochemical Society
Abstract
Water electrolysis is known as the most sustainable and clean technology to produce hydrogen gas, however, a serious drawback to commercialize this technology is due to the slow kinetics in oxygen evolution reaction (OER). Thus, we report on the nanoporous IrNi thin film that reveals a markedly enhanced OER activity, which is attained through a selective etching of Os from the IrNiOs alloy thin film. Interestingly, electrochemical selective etching of Os leads to the formation of 3-dimensionally interconnected nanoporous structure providing a high electrochemical surface area (ECSA, 80.8 cm(2)), which is 90 fold higher than a bulk Ir surface (0.9 cm(2)). The overpotential at the nanoporous IrNi electrode is markedly lowered to be 289 mV at 10 mA cm(-2), compared with bulk Ir (375 mV at 10 mA cm(-2)). The nanoporous IrNi prepared through the selective de-alloying of Os is promising as the anode material for a water electrolyzer.
URI
https://oasis.postech.ac.kr/handle/2014.oak/103087
ISSN
2093-8551
Article Type
Article
Citation
Journal of Electrochemical Science and Technology, vol. 10, no. 4, page. 402-407, 2019-12
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