催化作用
钴
金属有机骨架
甲醇
材料科学
热解
氧还原反应
化学工程
碳纤维
化学
电化学
氧气
无机化学
有机化学
物理化学
吸附
电极
复合材料
工程类
复合数
作者
Jiaojiao Gao,Yixuan Hu,Yu Wang,Xiaorong Lin,Kailong Hu,Xi Lin,Guoqiang Xie,Xingjun Liu,Kolan Madhav Reddy,Qunhui Yuan,Huajun Qiu
出处
期刊:Small
[Wiley]
日期:2021-11-05
卷期号:17 (49)
被引量:111
标识
DOI:10.1002/smll.202104684
摘要
Single-atom cobalt-based CoNC are promising low-cost electrocatalysts for oxygen reduction reaction (ORR). However, further increasing the single cobalt-based active sites and the ORR activity remain a major challenge. Herein, an acetate (OAc) assisted metal-organic framework (MOF) structure-engineering strategy is developed to synthesize hierarchical accordion-like MOF with higher loading amount and better spatial isolation of Co and much higher yield when compared with widely reported polyhedron MOF. After pyrolysis, the accordion-structured CoNC (CoNC (A)) is loaded with denser CoN4 active sites (Co: 2.88 wt%), approximately twice that of Co in the CoNC reported. The presence of OAc in MOF also induces the generation of big pores (5-50 nm) for improving the accessibility of active sites and mass transfer during catalytic reactions. Consequently, the CoNC (A) catalyst shows an admirable ORR activity with a E1/2 of 0.89 V (40 mV better than Pt/C) in alkaline electrolytes, outstanding durability, and absolute tolerance to methanol in both alkaline and acidic media. The CoNC-based Zn-air battery exhibits a high specific capacity (976 mAh g-1Zn ), power density (158 mW cm-2 ), rate capability, and long-term stability. This work demonstrates a reliable approach to construct single atom doped carbon catalysts with denser accessible active sites through MOF structure engineering.
科研通智能强力驱动
Strongly Powered by AbleSci AI