MOF derived catalysts for electrochemical oxygen reduction
MOF derived catalysts for electrochemical oxygen reduction
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用于电化学氧还原的 MOF 衍生催化剂
DOI：
10.1039/c4ta01506a
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发表时间：
2014-01-01
影响因子：
11.9
通讯作者：
Li, Xingguo
中科院分区：
文献类型：
--
作者：
Wang, Xiaojuan;Zhou, Junwen;Li, Xingguo
开发用于氧还原反应（ORR）的无贵金属催化剂对于生产低成本聚合物电解质膜燃料电池至关重要。本文以金属有机骨架（MOFs）为前驱体，在惰性气氛下热解制备了ORR催化剂。ORR性能被发现与金属/配体组合在MOFs中密切相关。基于Co-咪唑的M0 F（ZIF-67）衍生的催化剂在碱性和酸性电解质中均表现出最好的ORR活性。由ZIF-67中的芳族氮配体配位的Co阳离子可有助于在衍生催化剂中形成ORR活性位点。通过优化热解温度和酸浸过程，当衍生催化剂的孔隙率最大化时，获得最佳的ORR性能。最好的MOF衍生的催化剂的性能与Pt/C在碱性和酸性电解质中的性能相当。
Developing noble metal free catalysts for the oxygen reduction reaction (ORR) is of critical importance for the production of low cost polymer electrolyte membrane fuel cells. In this paper, metal organic frameworks (MOFs) are used as precursors to synthesize ORR catalysts via pyrolysis in an inert atmosphere. The ORR performance is found to be closely associated with the metal/ligand combination in MOFs. The Co-imidazole based MOF (ZIF-67) derived catalyst exhibits the best ORR activity in both alkaline and acidic electrolytes. The Co cations coordinated by the aromatic nitrogen ligands in ZIF-67 may assist the formation of ORR active sites in the derived catalyst. The best ORR performance is obtained when the porosity of the derived catalyst is maximized, by optimizing the pyrolysis temperature and the acid leaching process. The performance of the best MOF derived catalyst is comparable to that of Pt/C in both alkaline and acidic electrolytes.