4.7 Article

Strain-modulated Ni3Al alloy promotes oxygen evolution reaction

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 844, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156094

Keywords

Ni3Al alloy; Annealing; Acid oxidation; gamma' precipitates; High-valent Ni sites

Funding

  1. National Natural Science Foundation of China [51771132]

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Oxygen evolution reaction (OER) is crucial for electrochemical water splitting. However, corrosive issues in the alkaline environment impede its applications. Here, we explore the corrosion-resistant multiphase Ni3Al-based intermetallic alloy (Ni3Al alloy) as self-supported OER catalysts for the first time. A two-step treatment, annealing at high-temperature followed by acid oxidation is performed to improve the catalytic activity. Further investigations demonstrate that the annealing process can tune the size of gamma' precipitates, which will modify the strain effects caused by gamma/gamma' lattice mismatch to boost the OER activity. The oxidation of Ni during the acid pretreatment can facilitate the formation of active high-valent Ni sites during the OER process, and further enhance the OER performance. The optimized electrode exhibits a low overpotential of 280 mV at 10 mA cm(-2), a small Tafel slope of 73.5 mV dec(-1) and long-term stability of 180 h in 1 M KOH solution. The findings in this paper will inspire the exploration of high stability OER catalysts and the functional application of Ni3Al alloy. (C) 2020 Elsevier B.V. All rights reserved.

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