Ni/Co-based nanosheet arrays for efficient oxygen evolution reaction
Ni/Co-based nanosheet arrays for efficient oxygen evolution reaction
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DOI：
10.1016/j.nanoen.2018.08.010
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发表时间：
2018-10-01
期刊：
影响因子：
17.6
通讯作者：
Lee, Lawrence Yoon Suk
中科院分区：
文献类型：
--
作者：
Li, Yong;Hu, Liangsheng;Lee, Lawrence Yoon Suk
由地球丰富的元素组成的高效析氧反应（OER）催化剂对于开发实用且环保的水分解系统至关重要。在此，NiCoO2/CoO/Ni3N 纳米片阵列（NiCoON NSAs/NF）是在 3D 泡沫镍上原位制造的。在碱性溶液中，NiCoON纳米复合材料具有优异的催化OER性能，例如247 mV的小过电势（10 mA cm(-2)）和35 mV dec(-1)的塔菲尔斜率，优于NixCo3-xO4和大多数镍基和钴基催化剂。经过 NH3 处理后，NiCoON NSA 上有更多的氧空位活性位点，并且在电化学过程中，与脊柱 NixCo3-xO4 相比，面心立方 NiCoO2 增强了活性 Ni-Co 层状氢氧化物/羟基氧化物 (NiOOH) 的形成。此外，富含 Ni3+ 的表面与 Co 的掺入一起促进了 β-NiOOH 的形成。我们的研究表明，控制 NiCoON NSA/NF 上的活性物质可以提高 OER 催化的活性和稳定性。
Efficient oxygen evolution reaction (OER) catalysts composed of earth-abundant elements are crucial to the development of practical and environmentally friendly water splitting systems. Herein, NiCoO2/CoO/Ni3N nanosheet arrays (NiCoON NSAs/NF) are fabricated in situ on the 3D nickel foam. In the alkaline solution, the NiCoON nanocomposite has excellent catalytic OER properties such as a small overpotential of 247 mV (at 10 mA cm(-2)) and Tafel slope of 35 mV dec(-1), which are better than those of NixCo3-xO4 and most Ni- and Co-based catalysts. There are more active sites with oxygen vacancies on NiCoON NSAs after the treatment with NH3 and the face-centered cubic NiCoO2 enhances the formation of active Ni-Co layered hydroxide/oxyhydroxide species (NiOOH) in comparison with spinal NixCo3-xO4 during the electrochemical process. In addtion, the Ni3+-rich surface together with Co incorporation facilitates the formation of beta-NiOOH. Our study reveals that control of active species on NiCoON NSAs/NF leads to high activity and stability in OER catalysis.