双功能
过电位
电催化剂
材料科学
化学工程
析氧
催化作用
电池(电)
电解质
纳米复合材料
碳纤维
纳米技术
无机化学
电化学
电极
化学
复合数
有机化学
复合材料
功率(物理)
物理
物理化学
量子力学
工程类
作者
Yuping Chen,Shi-Yi Lin,Ruimin Sun,Ai‐Jun Wang,Lu Zhang,Xinbin Ma,Jiu‐Ju Feng
标识
DOI:10.1016/j.jcis.2021.07.082
摘要
Currently, it is critical but a tricky point to develop economical, high-efficiency, and durable non-precious metal electrocatalysts towards oxygen reduction and oxygen evolution reaction (ORR/OER) in rechargeable Zn-air batteries. Herein, N, Mn-codoped three-dimensional (3D) fluffy porous carbon nanostructures encapsulating FeCo/FeCoP alloyed nanoparticles (FeCo/FeCoP@NMn-CNS) are prepared by one-step pyrolysis of the metal precursors and polyinosinic acid. The optimized hybrid nanocomposite (obtained at 800 °C, named as FeCo/FeCoP@NMn-CNS-800) exhibits outstanding catalytic performance in the alkaline electrolyte with a half-wave potential (E1/2) of 0.84 V for the ORR and an overpotential of 325 mV towards the OER at 10 mA cm-2. Impressively, the FeCo/FeCoP@NMn-CNS-800-assembled rechargeable Zn-air battery presents an open-circuit voltage of 1.522 V (vs. RHE), a peak power density of 135.0 mW cm-2, and long-term durability by charge-discharge cycling for 200 h, surpassing commercial Pt/C + RuO2 based counterpart. This work affords valuable guidelines for exploring advanced bifunctional ORR and OER catalysts in rational construction of high-quality Zn-air batteries.
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