Heazlewoodite, Ni3S2: A Potent Catalyst for Oxygen Reduction to Water under Benign Conditions

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• 作者：Joseph M. Falkowski ; Nolan M. Concannon ; Bing Yan ; Yogesh Surendranath
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：July 1, 2015
• 年：2015
• 卷：137
• 期：25
• 页码：7978-7981
• 全文大小：285K
• ISSN：1520-5126

文摘

Electrodeposited thin films and nanoparticles of Ni₃S₂ are highly active, poison- and corrosion-resistant catalysts for oxygen reduction to water at neutral pH. In pH 7 phosphate buffer, Ni₃S₂ displays catalytic onset at 0.8 V versus the reversible hydrogen electrode, a Tafel slope of 109 mV decade^鈥?, and high faradaic efficiency for four-electron reduction of O₂ to water. Under these conditions, the activity and stability of Ni₃S₂ exceeds that of polycrystalline platinum and manganese, nickel, and cobalt oxides, illustrating the catalytic potential of pairing labile first-row transition metal active sites with a more covalent sulfide host lattice.