Surface functionalization of ZIF-8 with ammonium ferric citrate toward high exposure of Fe-N active sites for efficient oxygen and carbon dioxide electroreduction
Surface functionalization of ZIF-8 with ammonium ferric citrate toward high exposure of Fe-N active sites for efficient oxygen and carbon dioxide electroreduction
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使用柠檬酸铁铵对 ZIF-8 进行表面功能化，以实现 Fe-N 活性位点的高暴露，从而实现有效的氧气和二氧化碳电还原
DOI：
10.1016/j.nanoen.2017.05.042
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发表时间：
2017
期刊：
影响因子：
17.6
通讯作者：
Bao Xinhe
中科院分区：
文献类型：
--
作者：
Ye Yifan;Cai Fan;Li Haobo;Wu Haihua;Wang Guoxiong;Li Yanshuo;Miao Shu;Xie Songhai;Si Rui;Wang Jian;Bao Xinhe
孤立的金属-氮位点对于催化氧气和二氧化碳的电还原具有高活性，然而，碳基质中孤立的金属-氮位点的有限含量迫切需要充分暴露表面上的活性位点以进行有效的催化。在此，探索合成后修饰策略以选择性地将柠檬酸铁铵限制在沸石咪唑骨架-8（ZIF-8）纳米颗粒的表面上。热解后，孤立的铁-氮位点产生并位于碳基质表面上。高度暴露的铁-氮位点在酸性介质中对氧还原反应表现出优异的质量活性，优于大多数已报道的非贵金属催化剂，并且与大多数已报道的贵金属催化剂相比，还对二氧化碳电还原表现出优异的上级选择性和质量活性。
Isolated metal-nitrogen sites are highly active to catalyze the oxygen and carbon dioxide electroreduction, however, the limited content of isolated metal-nitrogen sites within carbon matrix urgently requires full exposure of the active sites on the surface for efficient catalysis. Herein, post-synthetic modification strategy is explored to selectively confine ammonium ferric citrate on the surface of zeolitic imidazolate framework-8 (ZIF-8) nanoparticles. After pyrolysis, isolated iron-nitrogen sites are generated and located on the carbon matrix surface. The highly exposed iron-nitrogen sites demonstrate excellent mass activity toward oxygen reduction reaction in acidic medium, outperforming most reported non-noble metal catalysts, and also show superior selectivity and mass activity toward carbon dioxide electroreduction compared to most reported noble metal catalysts.