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.

中文翻译：

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低温热解异双金属大环-N4 Corrole配合物用于氧还原的协同双原子分子催化剂

一种由氧还原反应（ORR）活性非贵金属Co和Fe组成的异双金属corrole配合物，具有corrole-N4中心（PhFCC），成功合成并用于制备双原子分子催化剂（DAMC）。温度热解。这种低温热解电催化剂在酸性和碱性条件下表现出令人印象深刻的 ORR 性能，起始电位分别为 0.86 和 0.94 V，半波电位分别为 0.75 和 0.85 V。在电位循环期间，该 DAMC 在 3000 次循环后在酸性和碱性条件下分别显示出仅 25 mV 和 5 mV 的半波电位损失，证明了其出色的稳定性。使用该 DAMC 作为阴极催化剂的基于单电池 Nafion 的质子交换膜燃料电池的性能显示最大功率密度为 225 mW cm^-2，几乎接近大多数基于金属-N4 大环的催化剂。本研究表明，保留定义的 CoN4 结构与共催化 Fe-Cx 位点协同充当双 ORR 活性中心，以提高整体 ORR 性能。使用低温热解的异双金属 CoN4-大环系统开发 DAMC 也有利于实际应用。