电催化剂
材料科学
析氧
电池(电)
双功能
煅烧
化学工程
碳纤维
纳米技术
催化作用
电化学
氧化物
电极
化学
复合数
冶金
物理
工程类
量子力学
物理化学
复合材料
功率(物理)
生物化学
作者
Xingwen Lu,Ye Chen,Sibo Wang,Shuyan Gao,Xiong Wen David Lou
标识
DOI:10.1002/adma.201902339
摘要
Abstract Rational design and synthesis of highly active and robust bifunctional non‐noble electrocatalysts for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are urgently required for efficient rechargeable metal–air batteries. Herein, abundant MnO/Co heterointerfaces are engineered in porous graphitic carbon (MnO/Co/PGC) polyhedrons via a facile hydrothermal‐calcination route with a bimetal–organic framework as the precursor. The in situ generated Co nanocrystals not only create well‐defined heterointerfaces with high conductivity to overcome the poor OER activity but also promote the formation of robust graphitic carbon. Owing to the desired composition and formation of the heterostructures, the resulting MnO/Co/PGC exhibits superior activity and stability toward both OER and ORR, which makes it an efficient air cathode for the rechargeable Zn–air battery. Importantly, the homemade Zn–air battery is able to deliver excellent performance including a peak power density of 172 mW cm −2 and a specific capacity of 872 mAh g −1 , as well as excellent cycling stability (350 cycles), outperforming commercial mixed Pt/C||RuO 2 catalysts. This work highlights the synergy from heterointerfaces in oxygen electrocatalysis, thus providing a promising approach for advanced metal–air cathode materials.
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