High-Index Faceted Ni3S2 Nanosheet Arrays as Highly Active and Ultrastable Electrocatalysts for Water Splitting
High-Index Faceted Ni3S2 Nanosheet Arrays as Highly Active and Ultrastable Electrocatalysts for Water Splitting
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高折射率多面 Ni3S2 纳米片阵列作为高活性和超稳定的水分解电催化剂
DOI：
10.1021/jacs.5b08186
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发表时间：
2015-11-11
影响因子：
15
通讯作者：
Zou, Xiaoxin
中科院分区：
文献类型：
--
作者：
Feng, Liang-Liang;Yu, Guangtao;Zou, Xiaoxin
从地球上丰富的元素中精心设计出高活性和稳定的催化剂，具有巨大的潜力，可以生产出替代在一系列有用的（电）化学过程中常用的贵金属基催化剂的材料。本文首次报道了在泡沫镍（NF）上原位生长{210}高折射率多面Ni3S2纳米片阵列的合成方法。结果表明，所制备的Ni3S2/NF材料在析氢反应（HER）和析氧反应（OER）中均可作为高活性、无粘结剂的双功能电催化剂。研究发现，Ni3S2/NF对HER和OER的法拉第产率接近100%，并表现出显著的催化稳定性（持续200 h）。实验结果和理论计算表明，Ni3S2/NF具有优异的催化活性主要是由于其纳米片阵列和暴露的{210}高指数面在其中产生的协同催化作用。
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 {210} 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 electro catalyst for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). Ni3S2/NF is found to give similar to 100% 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's excellent catalytic activity is mainly due to the synergistic catalytic effects produced in it by its nanosheet arrays and exposed {210} high-index facets.