3D star-like atypical hybrid MOF derived single-atom catalyst boosts oxygen reduction catalysis

Lei Zhou; Peng Zhou; Yelong Zhang; Bingyao Liu; Peng Gao; Shaojun Guo

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3D star-like atypical hybrid MOF derived single-atom catalyst boosts oxygen reduction catalysis

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Developing high-efficiency,stable and non-precious electrocatalysts for oxygen reduction reaction(ORR)is highly important for energy conversion and storage.Single atom catalysts(SACs)show good potential in enhancing ORR,however,the specifical control over the coordination surroundings around single metal center to intrinsically modify the electron structure is still a great challenge.Herein,we demonstrate that a 3 D hybrid MOF composed of cobalt doped ZIF-L and ZIF-8,featuring star morphology with six equal branches,can be used as an advanced precursor for making the Co SACs for greatly boosted ORR.The as-synthesized Co_(SA)-N-C exhibits excellent ORR activity with E_(1/2) of 0.891 V in alkaline medium,outperforming the commercial Pt/C by 39 m V.Moreover,the E_(1/2) of Co_(SA)-N-C(0.790 V)is merely 15 m V,less than that of Pt/C(0.805 V)in acid medium,which is among the best in the reported state-of-the-art SACs.DFT calculations demonstrate that the enhanced ORR performance is assigned to the formation of atomically isolated cobalt atom coordinated three N atoms and one C atom,which is easier to decrease the free energy of rate determining step and accelerate the ORR process than that of traditional cobalt atom coordinated four N atoms.In addition,a primary Zn-air battery with Co_(SA)-N-C cathode reveals a maximum power density of 92.2 m W cm^(-2) at 120.0 m A cm^(-2),far higher than that of commercial catalysts(74.2 m W cm^(-2) at 110.0 m A cm^(-2)).

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《能源化学：英文版》 |2021年第4期|P.355-360|共6页
作者
Lei Zhou; Peng Zhou; Yelong Zhang; Bingyao Liu; Peng Gao; Shaojun Guo;
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作者单位

BIC-ESAT College of Engineering Peking University Beijing 100871 ChinaDepartment of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China;

Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China;

School of Applied Physics and Materials Wuyi University Jiangmen 529020 Guangdong China;

International Center for Quantum Materials and Electron Microscopy Laboratory School of Physics Peking University Beijing 100871 China;

International Center for Quantum Materials and Electron Microscopy Laboratory School of Physics Peking University Beijing 100871 China;

BIC-ESAT College of Engineering Peking University Beijing 100871 ChinaDepartment of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China;

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原文格式 PDF
正文语种 chi
中图分类物理化学（理论化学）、化学物理学;
关键词
Single atom catalysts; Oxygen reduction reaction; Metal-organic frameworks; Zn-air battery;

机译：单个原子催化剂;氧还原反应;金属有机框架;Zn-air电池;

3D star-like atypical hybrid MOF derived single-atom catalyst boosts oxygen reduction catalysis

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