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Confined Synthesis of Oriented Two-Dimensional Ni3(hexaiminotriphenylene)2 Films for Electrocatalytic Oxygen Evolution Reaction.
Langmuir ( IF 3.7 ) Pub Date : 2020-06-09 , DOI: 10.1021/acs.langmuir.0c01128
Xuan-He Liu 1 , Ya-Wen Yang 1, 2 , Xiao-Ming Liu 1 , Qing Hao 2 , Li-Mei Wang 2 , Bing Sun 1 , Jing Wu 1 , Dong Wang 2
Affiliation  

Metal–organic frameworks (MOFs) can provide atomically dispersed metal active coordination sites (M–NX, M–SX, and M–OX) for electrocatalytic reactions. Among them, MOFs with motif M–NX or analogues are expected to be promising active electrode materials for oxygen evolution reaction (OER). Contrary to bulk MOFs, two-dimensional (2D) MOFs usually have high surface areas, fully exposed active sites, and specific electrical properties. Herein, we constructed 2D Ni3(hexaiminotriphenylene)2 [Ni3(HITP)2] films on the electrode surface by utilizing the bottom-up liquid/liquid/gel tri-phase interface system and explored their potential applications in electrocatalytic OER. The thickness of the 2D Ni3(HITP)2 films can be controlled to be about 5 nm. The prepared 2D Ni3(HITP)2 films had oriented polycrystalline character and showed excellent performance in OER. A current density of 10 mA cm–2 for 3-layer Ni3(HITP)2 film electrodes was obtained at 1.62 V, which was 20 mV lower than that for the commercial IrO2 catalyst. Electrochemical tests and electrochemical impedance spectroscopy showed that better OER performance of 3-layer Ni3(HITP)2 films was ascribed to their high electrochemically active surface area, better kinetic process, and fast ion diffusion and transport.

中文翻译:

定向二维Ni3(六亚氨基三亚苯基)2薄膜的电催化氧分解反应的有限合成。

金属有机框架(MOF)可以为电催化反应提供原子分散的金属活性配位点(M–N X,M–S X和M–O X)。其中,以基序M-N的MOF X或类似物预期将有希望的析氧反应(OER)活性电极材料。与体MOF相反,二维(2D)MOF通常具有高的表面积,完全暴露的活性位点和特定的电特性。在此,我们构建了2D Ni 3(六亚氨基三亚苯基)2 [Ni 3(HITP)2利用自下而上的液/液/凝胶三相界面系统在电极表面形成一层薄膜,并探索了它们在电催化OER中的潜在应用。2D Ni 3(HITP)2膜的厚度可以控制为约5 nm。制备的2D Ni 3(HITP)2薄膜具有取向的多晶特性,在OER中表现出优异的性能。三层Ni 3(HITP)2膜电极的电流密度为1.62 V,电流密度为10 mA cm -2,比商用IrO 2催化剂低20 mV 。电化学测试和电化学阻抗谱表明,三层镍的OER性能更好3(HITP)2膜归因于其高电化学活性表面积,更好的动力学过程以及快速的离子扩散和传输。
更新日期:2020-07-07
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