化学
催化作用
光化学
咔咯
无机化学
材料科学
Atom(片上系统)
氧还原
作者
Satyanarayana Samireddi,V. Aishwarya,Indrajit Shown,Saravanakumar Muthusamy,Sreekuttan M. Unni,Ken-Tsung Wong,Kuei-Hsien Chen,Li-Chyong Chen
出处
期刊:Small
[Wiley]
日期:2021-10-19
卷期号:17 (46): 2103823-
标识
DOI:10.1002/smll.202103823
摘要
A heterobimetallic corrole complex, comprising oxygen reduction reaction (ORR) active non-precious metals Co and Fe with a corrole-N4 center (PhFCC), is successfully synthesized and used to prepare a dual-atom molecular catalyst (DAMC) through subsequent low-temperature pyrolysis. This low-temperature pyrolyzed electrocatalyst exhibited impressive ORR performance, with onset potentials of 0.86 and 0.94 V, and half-wave potentials of 0.75 and 0.85 V, under acidic and basic conditions, respectively. During potential cycling, this DAMC displayed half-wave potential losses of only 25 and 5 mV under acidic and alkaline conditions after 3000 cycles, respectively, demonstrating its excellent stability. Single-cell Nafion-based proton exchange membrane fuel cell performance using this DAMC as the cathode catalyst showed a maximum power density of 225 mW cm-2 , almost close to that of most metal-N4 macrocycle-based catalysts. The present study showed that preservation of the defined CoN4 structure along with the cocatalytic Fe-Cx site synergistically acted as a dual ORR active center to boost overall ORR performance. The development of DAMC from a heterobimetallic CoN4-macrocyclic system using low-temperature pyrolysis is also advantageous for practical applications.
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