Surface Sulfurization of NiCo-Layered Double Hydroxide Nanosheets Enable Superior and Durable Oxygen Evolution Electrocatalysis

Surface Sulfurization of NiCo-Layered Double Hydroxide Nanosheets Enable Superior and Durable Oxygen Evolution Electrocatalysis
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NiCo层状双氢氧化物纳米片的表面硫化可实现卓越且持久的析氧电催化

DOI:
10.1021/acsaem.8b00723
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发表时间:
2018-08
影响因子:
6.4
通讯作者:
Ding Weiping
Ding Weiping
中科院分区:
材料科学3区
文献类型:
--
作者:
Xiang Kun;Guo Jia;Xu Jia;Qu Tingting;Zhang Yu;Chen Shanyong;Hao Panpan;Li Muhong;Xie Mingjiang;Guo Xuefeng;Ding Weiping

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开发用于析氧反应(OER)的地球资源丰富、高活性和耐用的电催化剂对于许多可再生能源转换过程非常重要。本文报道了一种新型的NiCo层状双氢氧化物@ NiCo-羟基硫化物(NiCo-LDH@HOS)纳米片阵列的OER电催化剂,该催化剂是通过在泡沫镍上生长的NiCo-LDH纳米片表面进行快速室温硫化而制备的。表面硫化对NiCo-LDH的结构、组成、表面性质和化学性质产生重要影响。表面硫化后,NiCo-羟基硫化物层的导电性和耐碱性提高,在0.1 M KOH溶液中,过电位为293 mV时,电流密度稳定在10.0 mA cm-2,62 h稳定性良好。所实现的增强的析氧活性和改进的耐久性优于NiCo-LDH纳米片和基准商业RuO 2纳米片的那些上级。
Developing earth-abundant, highly active, and durable electrocatalysts for the oxygen evolution reaction (OER) is very important for many renewable energy conversion processes. Herein, we report a novel OER electrocatalyst of NiCo layered double hydroxide@NiCo-hydroxysulfide (NiCo-LDH@HOS) nanosheet arrays, which are prepared by a rapid room-temperature sulfurization of the surface of NiCo-LDH nanosheets grown on Ni foam. The surface sulfurization exerts important influences/changes on the structure, composition, surface properties and chemistry of NiCo-LDH. After surface sulfurization, the resulted NiCo-hydroxysulfide layer armor improved electrical conductivity and chemical resistance to alkaline electrolyte, delivers a stable current density of 10.0 mA cm–2 at a low overpotential of 293 mV in 0.1 M KOH solution, maintaining high stability during a 62 h test. The achieved enhanced oxygen evolution activity and improved durability are superior to those of NiCo-LDH nanosheets and benchmark commercial RuO2...
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