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

  • Park, Shin-Ae (School of Mechanical Engineering, Pusan National University) ;
  • Shim, Kyubin (Department of Materials Science and Engineering, Pohang University of Science and Technology) ;
  • Kim, Kyu-Su (School of Mechanical Engineering, Pusan National University) ;
  • Moon, Young Hoon (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Yong-Tae (School of Mechanical Engineering, Pusan National University)
  • Received : 2019.05.08
  • Accepted : 2019.07.05
  • Published : 2019.12.31

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 ㎠), which is 90 fold higher than a bulk Ir surface (0.9 ㎠). 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.

Acknowledgement

Supported by : Pusan National University

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