Confined Synthesis of Oriented Two-Dimensional Ni3(hexaiminotriphenylene)2 Films for Electrocatalytic Oxygen Evolution Reaction
Confined Synthesis of Oriented Two-Dimensional Ni3(hexaiminotriphenylene)2 Films for Electrocatalytic Oxygen Evolution Reaction
复制标题
用于电催化析氧反应的定向二维Ni-3(六亚氨基苯并菲)2薄膜的受限合成
DOI：
10.1021/acs.langmuir.0c01128
复制
发表时间：
2020-07-07
期刊：
影响因子：
3.9
通讯作者：
Wang, Dong
中科院分区：
文献类型：
--
作者：
Liu, Xuan-He;Yang, Ya-Wen;Wang, Dong
金属有机骨架可以为电催化反应提供原子分散的金属活性配位位点（M-N-X、M-S-X和M-O-X）。其中，具有M-N-X基序或类似物的mof有望成为有前途的析氧反应活性电极材料。与大块mof相反，二维mof通常具有高表面积、完全暴露的活性位点和特定的电性能。本文利用自下而上的液/液/凝胶三相界面体系在电极表面构建了二维Ni-3（己胺-三苯）(2)[Ni-3(HITP)(2)]薄膜，并探索了其在电催化OER中的潜在应用。二维Ni-3(HITP)(2)薄膜的厚度可控制在5nm左右。制备的二维Ni-3(HITP)(2)薄膜具有取向多晶特性，在OER中表现出优异的性能。在1.62 V下，三层Ni-3(HITP)(2)薄膜电极的电流密度为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分析表明，三层Ni-3(HITP)(2)膜具有较好的OER性能是由于其具有较高的电化学活性表面积、较好的动力学过程和快速的离子扩散和输运。
Metal-organic frameworks (MOFs) can provide atomically dispersed metal active coordination sites (M-N-X, M-S-X and M-O-X) for electrocatalytic reactions. Among them, MOFs with motif M-N-X 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 Ni-3 (hexaimino-triphenylene)(2) [Ni-3(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 Ni-3(HITP)(2) films can be controlled to be about 5 nm. The prepared 2D Ni-3(HITP)(2) films had oriented polycrystalline character and showed excellent performance in OER. A current density of 10 mA cm(-2) for 3-layer Ni-3(HITP)(2) film electrodes was obtained at 1.62 V, which was 20 mV lower than that for the commercial Iro(2) catalyst. Electrochemical tests and electrochemical impedance spectroscopy showed that better OER performance of 3-layer Ni-3(HITP)(2) films was ascribed to their high electrochemically active surface area, better kinetic process, and fast ion diffusion and transport.