NiCo-DH nanodots anchored on amorphous NiCo-Sulfide sheets as efficient electrocatalysts for oxygen evolution reaction

NiCo-DH nanodots anchored on amorphous NiCo-Sulfide sheets as efficient electrocatalysts for oxygen evolution reaction
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锚定在非晶镍钴硫化物片上的 NiCo-DH 纳米点作为析氧反应的有效电催化剂

DOI:
10.1016/j.electacta.2018.11.150
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发表时间:
2019-02
影响因子:
6.6
通讯作者:
Zhang Xin
Zhang Xin
中科院分区:
材料科学2区
文献类型:
--
作者:
Zhao Huihui;Yang Yang;Dai Xiaoping;Qiao Hongyan;Yong Jiaxi;Luan Xuebin;Yu Lei;Luan Chenglong;Wang Yao;Zhang Xin

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提出了一种层状反胶束定向组装策略,通过一步溶剂热法集成镍钴层状氢氧化物(NiCoDH)纳米点和镍钴硫化物(NiCoS)纳米片(NiCoDH/NiCoS)。 NiCoDH/NiCoS 具有互连的 3D 结构,由超薄非晶 NiCoS 纳米片(~1.5 nm)组成,并由超小 NiCoDH 纳米点(2-3 nm)装饰。最佳NiCoDH/NiCoS在电流密度为20mAcm−2时表现出303mV的低过电势,以及77.6mV dec−1的小塔菲尔斜率、约95%的高法拉第效率以及良好的稳定性。优异的OER性能和增强的稳定性应归功于NiCoDH纳米点/NiCoS纳米片的强界面耦合、双金属Co和Ni的高度协同效应、暴露更多活性位点的非晶态结构以及用于有效传质和结构稳定性的互连3D结构。这项工作提供了关于 OER 电催化中强界面耦合效应的重要见解,并提供了设计高效 OER 催化剂的新策略。
A lamellar reverse micelle directed assembly strategy was proposed to integrate NiCo layered hydroxides (NiCoDH) nanodots and NiCo sulfide (NiCoS) nanosheets (NiCoDH/NiCoS) by one-step solvothermal method. The NiCoDH/NiCoS features with an interconnected 3D architecture composed of ultrathin amorphous NiCoS nanosheets (∼1.5 nm), decorated by ultra-small NiCoDH nanodots (2–3 nm). The optimal NiCoDH/NiCoS exhibits a low overpotential of 303 mV at current density of 20 mA cm−2, together with a small Tafel slope of 77.6 mV dec−1, the high Faraday efficiency of about 95% as well as good stability. The excellent OER performance and enhanced stability should be ascribed to the strong interface-coupling of NiCoDH nanodots/NiCoS nanosheets, highly synergistic effect of bimetal Co and Ni, amorphous-like structure to expose more active sites, and interconnected 3D architecture for effective mass transport and structural stability. This work provides a significant insight regarding the strong interface-coupling effect on OER electrocatalysis, and offers a new strategy to design highly efficient OER catalysts.
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