Zhang Chuanxiang, Wu Chao, Gao Yong, Gong Yun, Liu Huiying, He Jianping
School of Materials Science and Engineering, Nanjing Institute of Technology, 211167, Nanjing, P. R. China.
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 211106, Nanjing, P. R. China.
Chem Asian J. 2021 Jun 14;16(12):1592-1602. doi: 10.1002/asia.202100347. Epub 2021 May 13.
High-performance and low-cost bifunctional catalysts are crucial to energy conversion and storage devices. Herein, a novel oxygen electrode catalyst with high oxygen evolution reaction and oxygen reduction reaction (OER/ORR) performance is reported based on bimetal FeNi nanoparticles anchored on N-doped graphene-like carbon (FeNi/N-C). The complete 2D ultrathin carbon nanosheet is induced by etching and stripping of molten sodium chloride and its ions in the carbonization process at suitable temperature. The obtained FeNi/N-C catalyst exhibits rapid reaction kinetics for OER, efficient four electron transfer for ORR, and outstanding bifunctional performance with reversible oxygen electrode index of 0.87 V for OER/ORR. Zn-air batteries with a high open-circuit voltage of 1.46 V and a stable discharge voltage of 1.23 V are assembled using liquid electrolytes, zinc sheet as Zn-electrode and FeNi/N-C coating on carbon cloth as air-electrode. The specific capacity is as high as 816 mAh g and there is extremely little decay after charge-discharge cycle time of 275 h for the FeNi/N-C as oxygen electrode catalyst in Zn-air battery, which are much better than that assembled with Pt/C-RuO catalyst.
高性能且低成本的双功能催化剂对于能量转换和存储设备至关重要。在此，报道了一种基于锚定在氮掺杂类石墨烯碳（FeNi/N-C）上的双金属FeNi纳米颗粒的具有高析氧反应和氧还原反应（OER/ORR）性能的新型氧电极催化剂。在合适温度下的碳化过程中，通过熔融氯化钠及其离子的蚀刻和剥离诱导出完整的二维超薄碳纳米片。所获得的FeNi/N-C催化剂表现出OER的快速反应动力学、ORR的高效四电子转移以及出色的双功能性能，OER/ORR的可逆氧电极指数为0.87 V。使用液体电解质、锌片作为锌电极以及碳布上的FeNi/N-C涂层作为空气电极组装了开路电压高达1.46 V且稳定放电电压为1.23 V的锌空气电池。在锌空气电池中，作为氧电极催化剂的FeNi/N-C的比容量高达816 mAh g，在275 h的充放电循环时间后衰减极小，这比用Pt/C-RuO催化剂组装的电池要好得多。
