【摘要】 金属-氮-碳(M-N-C)化合物作为非贵金属催化剂具有优异的氧还原(ORR)性能,在燃料电池和金属-空气电池等电化学能源转化方面展现了广阔的应用前景。开发出能够与贵金属铂催化剂相媲美的高效且廉价的催化剂以解决ORR缓慢动力学问题具有重要意义。选用金属有机骨架材料ZIF-67作为碳源和氮源,其中,二价钴离子、2-甲基咪唑和高分子聚合物聚乙烯亚胺(PEI)在室温下快速原位合成催化剂,PEI不仅能避免ZIF-67的团聚还提高了催化剂的氮含量。所制备出的纳米材料Co-N-C(ZIF-67+PEI)催化剂在碱性电解质中拥有优于商业Pt/C的ORR性能及稳定性和抗甲醇性能。更多还原

【Abstract】 Metal-nitrogen-carbon(M-N-C) compounds have excellent oxygen reduction(ORR) properties as non-noble metal catalysts, and have shown wide application prospects in electrochemical energy conversion, such as metal-air batteries and fuel cells. It is of great significance to develop an efficient and inexpensive catalyst comparable to the noble metal platinum catalyst to solve the ORR slow kinetics problem. In this work, metal organic skeleton material ZIF-67 is selected as carbon source and nitrogen source. Among them, cobalt divalent ion, 2-methylimidazole and polymer polyethylenimine(PEI) are used to rapidly synthesize catalysts in situ at room temperature. PEI not only avoids the agglomeration of ZIF-67 but also increases the nitrogen content of catalysts. The prepared nano-material Co-N-C(ZIF-67+PEI) catalyst has better ORR performance, stability and methanol resistance than commercial Pt/C in alkaline electrolyte.更多还原