BIC-EAST, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
Nanoscale. 2017 Jun 22;9(24):8102-8106. doi: 10.1039/c7nr00988g.
Developing efficient and economical noble-metal free catalysts for oxygen reduction reaction (ORR) is one of the essential factors for the industrialization of fuel cells. Recent studies on transition metal ORR catalysts have become the priority to practical low-temperature fuel cells. Herein, we proposed a novel in situ design, FeN nanoparticles (NPs) in an N doped porous carbon matrix (FeN@NPC) derived from metal organic frameworks (MOFs) as high-performance ORR catalysts. The decorated FeN NPs increase the amount of Fe-N/C bonding as catalytic site. Meanwhile, the coated NPC facilitates the mass transport of the reaction and improves the conductivity simultaneously. The catalyst exhibits an onset potential of -0.038 V, a half-wave potential of -0.175 V in 0.1 M KOH, and superior stabilities and methanol tolerance performances to commercial Pt/C catalysts. More importantly, the proposed in situ 'two-step' annealing route provides potential possibilities for producing other non-precious metal catalysts for ORR.
开发高效、经济的非贵金属氧还原反应（ORR）催化剂是燃料电池产业化的关键因素之一。近年来，过渡金属 ORR 催化剂的研究成为实用低温燃料电池的重点。本文提出了一种新的原位设计方法，即由金属有机框架（MOFs）衍生的氮掺杂多孔碳基质中的 FeN 纳米颗粒（NPs）（FeN@NPC）作为高性能 ORR 催化剂。这种方法可以增加 Fe-N/C 键的数量，作为催化位点。同时，涂层 NPC 促进了反应的质量传输，同时提高了电导率。该催化剂在 0.1 M KOH 中表现出起始电位为-0.038 V，半波电位为-0.175 V，具有优于商业 Pt/C 催化剂的稳定性和甲醇耐受性。更重要的是，所提出的原位“两步”退火路线为制备其他非贵金属 ORR 催化剂提供了潜在的可能性。
