Lateral Size Effects of Two-dimensional IrO<sub>2</sub> Nanosheets towards the Oxygen Evolution Reaction Activity

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  • TAKIMOTO Daisuke
    Interdisciplinary Graduate School of Science and Technology, Shinshu University
  • AYATO Yusuke
    Faculty of Textile Science and Technology, Shinshu University Center for Energy and Environmental Science, Shinshu University
  • MOCHIZUKI Dai
    Interdisciplinary Graduate School of Science and Technology, Shinshu University Faculty of Textile Science and Technology, Shinshu University Center for Energy and Environmental Science, Shinshu University
  • SUGIMOTO Wataru
    Interdisciplinary Graduate School of Science and Technology, Shinshu University Faculty of Textile Science and Technology, Shinshu University Center for Energy and Environmental Science, Shinshu University

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  • Lateral Size Effects of Two-dimensional IrO₂ Nanosheets towards the Oxygen Evolution Reaction Activity

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Description

The oxygen evolution reaction of anode catalyst is an important reaction in polymer electrolyte membrane water electrolysis. Recent research has focused on understanding the factors governing the catalytic properties of nanostructured IrO2 in order to decrease the use of expensive and precious IrO2. We demonstrate here the equivalent diameter (De) effect (lateral size effect) of IrO2 nanosheets for the oxygen evolution reaction. IrO2 nanosheets with four different De from 110 to 260 nm and same thickness (∼1.5 nm) were prepared. The electrical double layer capacitance, which should be proportional to the electrochemically active surface area, of IrO2 nanosheets was independent of De. On the other hand, the pseudo-capacitance, which is related to surface redox processes, and the oxygen evolution reaction activity increased with decreasing De. The enhanced oxygen evolution reaction activity is discussed based on the electrochemically active surface area and edge effect.

Journal

  • Electrochemistry

    Electrochemistry 85 (12), 779-783, 2017

    The Electrochemical Society of Japan

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