
ZIF-8衍生高效Fe-N-C催化剂的制备及其氧还原性能
张赛航, 姚赢赢, 李钊, 邹建新
ZIF-8衍生高效Fe-N-C催化剂的制备及其氧还原性能
Synthesis of ZIF-8 derived high-efficiency Fe-N-C catalyst and its oxygen reduction reaction performance
为推动燃料电池的大规模商业化应用,开发高效、稳定和低成本的氧还原(ORR)催化剂具有重要意义。本工作以Fe掺杂ZIF-8为前驱体,通过球磨、高温氩气气氛下煅烧、酸洗后,在氨气气氛下进行二次煅烧,得到Fe-N-C非贵金属催化剂,多种表征手段的结果显示Fe原子均匀分散在氮掺杂的碳骨架上,从而形成丰富的Fe-N x 催化活性位点。电化学性能测试结果表明,通过制备工艺和金属比例优化后的Fe-N-C-5%催化剂,在0.1 mol/L HClO4的酸性溶液中表现出优异的ORR活性,半波电位为0.845 V,同时兼具良好的稳定性,在20000次循环后半波电位没有明显下降,这些结果为合理设计非贵金属ORR催化剂提供了有效的策略。
To promote the large-scale commercial application of fuel cells, efficient, stable, and low-cost oxygen reduction reaction (ORR) catalysts should be developed. In this study, a Fe-doped ZIF-8 is used as the precursor, and the Fe-N-C non-precious metal catalyst is obtained by ball milling, calcination under a high-temperature argon atmosphere, pickling, and secondary calcination under an ammonia atmosphere. The results of various characterization methods show that Fe atoms are uniformly dispersed on the nitrogen-doped carbon framework, thus forming abundant Fe-N x active sites. The electrochemical performance test results show that the Fe-N-C-5% catalyst with optimized preparation process and metal contents exhibits excellent ORR activity in 0.1 mol/L HClO4 acidic solution, with a half-wave potential of 0.845 V. Meantime, it has good stability, and the half-wave potential does not drop significantly after 20000 cycles. These results provide an effective strategy for the rational design of precious metal-free ORR catalysts in the future.
氧还原反应 / 非贵金属催化剂 / 质子交换膜燃料电池 / 电催化 / 金属有机框架材料
oxygen reduction reaction / non-precious metal catalyst / proton exchange membrane fuel cell / electrocatalysis / metal-organic framework
TB34 / TQ426
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