金属有机骨架(ZIF-8@ZIF-67)衍生的Co/N共掺杂碳基催化剂在氧还原反应(ORR)中的应用

A carbon catalyst doped with Co and N derived from the metal-organic framework hybrid (ZIF-8@ZIF-67) for efficient oxygen reduction reaction

  • 摘要: 在燃料电池中,碳基氧还原反应 (ORR) 催化剂被认为是昂贵的铂基催化剂的潜在替代品。近年来,由过渡金属和氮原子共掺杂的碳基材料 (M-N-C) 以其低成本和优异的活性而受到研究人员的广泛关注。在此,通过精心设计的杨桃状MOF (ZIF-8@ZIF-67) 为前驱体,采用简单的一步热解法制备钴、氮共掺杂多孔炭材料 (命名为Co-N@CNT-C800)。Co-N@CNT-C800产生了大量碳纳米管 (CNT),独特的三维结构保证了较高的比表面积和孔隙率,有利于ORR的传质和电子传递。同时,Co-N@CNT-C800在碱性介质中表现出优异的半波电位和极限电流密度,分别为0.841 V和5.07 mA·cm−2。此外,与商用Pt/C材料相比,Co-N@CNT-C800还表现出优异的电化学稳定性和耐甲醇毒性。该策略为制备低成本、高活性的能量转换电催化剂提供了一种有效的方法。

     

    Abstract: Carbon-based catalysts for the oxygen reduction reaction (ORR) are considered potential substitutes for the expensive platinum-based catalysts. Recently, transition metal and nitrogen co-doped carbon materials (M-N-C) have attracted much attention from researchers due to their low cost and excellent activity. A cobalt- and nitrogen-co-doped porous carbon material (Co-N@CNT-C800) was prepared by the simple one-step pyrolysis of a star fruit-like MOF hybrid (ZIF-8@ZIF-67) at 800 °C. It consisted of CNTs with substantial Co and N co-doping and had a large surface area (428 m2·g−1). It had an excellent half-wave potential and good current density in alkaline media in the ORR with values of 0.841 V and 5.07 mA·cm−2, respectively. Compared with commercial Pt/C materials it also had excellent electrochemical stability and methanol tolerance. This research provides an effective way to fabricate low cost, high activity electrocatalysts for use in energy conversion.

     

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