Plasma modification of a Ni based metal-organic framework for efficient hydrogen evolution
Plasma modification of a Ni based metal-organic framework for efficient hydrogen evolution
复制标题
用于高效析氢的镍基金属有机骨架的等离子体改性
DOI：
10.1039/c9ta00696f
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发表时间：
2019
影响因子：
11.9
通讯作者：
Li Xingguo
中科院分区：
文献类型：
--
作者：
Guo Yanru;Gao Xing;Zhang Chunmei;Wu Yong;Chang Xinghua;Wang Teng;Zheng Xingyao;Du Aijun;Wang Bo;Zheng Jie;Ostrikov Kostya;Li Xingguo
金属-有机骨架（MOFs）的热分解被广泛用于制备用于各种应用的金属催化剂。在大多数情况下，由于分解温度高，会发生严重的金属附聚，这会导致活性催化位点的损失。在这项工作中，我们报告了一个独特的分解模式的镍基MOF（镍MOF-74）在低温NH3等离子体。在Ni泡沫上生长的Ni MOF-74被转化成具有由封装在N掺杂碳薄层中的超细Ni纳米晶体（直径仅2.5 nm）组成的杨桃状分级3D结构的单片电极。这种独特的结构归因于高活性N物种和低温NH3等离子体的低热效应的组合。将该催化剂应用于太阳能电池驱动的水电解-氢燃料电池系统中，结果表明，该催化剂对水电解析氢反应具有良好的催化性能。
Thermal decomposition of metal–organic frameworks (MOFs) is widely used to prepare metal catalysts for various applications. In most cases, severe metal agglomeration occurs due to the high decomposition temperature, which causes loss of active catalytic sites. In this work, we report a distinct decomposition pattern of a Ni based MOF (Ni MOF-74) in low temperature NH3 plasma. Ni MOF-74 grown on Ni foam is converted into a monolithic electrode with a carambola-like hierarchical 3D structure composed of ultrafine Ni nanocrystals (only 2.5 nm in diameter) encapsulated in a thin layer of N-doped carbon. The unique structure is attributed to the combination of highly reactive N species and the low thermal effect of low temperature NH3 plasma. High catalytic performance for the hydrogen evolution reaction from water electrolysis is demonstrated for this MOF-derived catalyst, which is applied in a solar cell driven water electrolysis-hydrogen fuel cell system.