Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 16, Pages 5359-5364Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201901109
Keywords
cobalt; electrocatalysis; metal-air batteries; oxygen reduction; zeolites; cobalt; electrocatalysis; metal-air batteries; oxygen reduction; zeolites
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Funding
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- National Natural Science Foundation of China [U1601216, 51602216, 51571151, 51671143, 21805117]
- Tianjin Natural Science Foundation [17JCQNJC02100]
- Jiangsu Province Science Foundation for Youths [BK20181014]
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The size effect of transition-metal nanoparticles on electrocatalytic performance remains ambiguous especially when decreasing the size to the atomic level. Herein, we report the spatial isolation of cobalt species on the atomic scale, which was achieved by tuning the zinc dopant content in predesigned bimetallic Zn/Co zeolitic imidazole frameworks (ZnCo-ZIEs), and led to the synthesis of nanoparticles, atomic clusters, and single atoms of Co catalysts on N-doped porous carbon. This synthetic strategy allowed an investigation of the size effect on electrochemical behavior from nanometer to angstrom ngstrom dimensions. Single-atom Co catalysts showed superior bifunctional ORR/OER activity, durability, and reversibility in Zn-air batteries compared with the other derivatives and noble-metal Pt/C + RuO2, which was attributed to the high reactivity and stability of isolated single Co atoms. Our findings open up a new avenue to regulate the metal particle size and catalytic performance of MOF derivatives.
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