Monitoring oxygen-vacancy ratio in NiFe-based electrocatalysts during oxygen evolution reaction in alkaline electrolyte

초록

High oxygen-vacancy ratio has been recognized as an important criterion for oxygen evolving electrocatalysts to achieve high catalytic performance. Herein, we report changes in the oxygen-vacancy ratio during long-term stability tests. NiFe-based electrocatalysts containing various anions were prepared by a simple electrodeposition. After the fabrication procedure was optimized, the S-doped NiFe oxide electrocatalyst exhibited higher intrinsic activity than others in an alkaline electrolyte because it had the highest oxygen-vacancy ratio. During oxygen evolution at a constant positive potential, the intrinsic activity of the S-doped NiFe oxide electrocatalyst showed a significant correlation with the oxygen-vacancy ratio and surface morphology as a function of time. (C) 2018 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

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