High-Index Faceted Ni3S2 Nanosheet Arrays as Highly Active and Ultrastable Electrocatalysts for Water Splitting

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• 作者：Liang-Liang Feng ; Guangtao Yu ; Yuanyuan Wu ; Guo-Dong Li ; Hui Li ; Yuanhui Sun ; Tewodros Asefa ; Wei Chen ; Xiaoxin Zou
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：137
• 期：44
• 页码：14023-14026
• 全文大小：318K
• ISSN：1520-5126

文摘

Elaborate design of highly active and stable catalysts from Earth-abundant elements has great potential to produce materials that can replace the noble-metal-based catalysts commonly used in a range of useful (electro)chemical processes. Here we report, for the first time, a synthetic method that leads to in situ growth of {2虆10} high-index faceted Ni₃S₂ nanosheet arrays on nickel foam (NF). We show that the resulting material, denoted Ni₃S₂/NF, can serve as a highly active, binder-free, bifunctional electrocatalyst for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). Ni₃S₂/NF is found to give 鈭?00% Faradaic yield toward both HER and OER and to show remarkable catalytic stability (for >200 h). Experimental results and theoretical calculations indicate that Ni₃S₂/NF鈥檚 excellent catalytic activity is mainly due to the synergistic catalytic effects produced in it by its nanosheet arrays and exposed {2虆10} high-index facets.