Single Co Atoms Anchored in Porous N-Doped Carbon for Efficient Zinc−Air Battery CathodesClick to copy article linkArticle link copied!
- Wenjie ZangWenjie ZangDepartment of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574More by Wenjie Zang
- Afriyanti SumbojaAfriyanti SumbojaInstitute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #8-13, Singapore 138634Material Science and Engineering Research Group, Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, IndonesiaMore by Afriyanti Sumboja
- Yuanyuan MaYuanyuan MaDepartment of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #8-13, Singapore 138634More by Yuanyuan Ma
- Hong ZhangHong ZhangDepartment of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574More by Hong Zhang
- Yue WuYue WuDepartment of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574More by Yue Wu
- Sisi WuSisi WuDepartment of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574More by Sisi Wu
- Haijun WuHaijun WuDepartment of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574More by Haijun Wu
- Zhaolin Liu*Zhaolin Liu*E-mail: [email protected]Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #8-13, Singapore 138634More by Zhaolin Liu
- Cao Guan*Cao Guan*E-mail: [email protected]Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574More by Cao Guan
- John Wang*John Wang*E-mail: [email protected]Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574More by John Wang
- Stephen J. Pennycook*Stephen J. Pennycook*E-mail: [email protected]Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574More by Stephen J. Pennycook
Abstract

Exploration of cheap, efficient, and highly durable transition-metal-based electrocatalysts is critically important for the renewable energy chain, including both energy storage and energy conversion. Herein, we have developed cobalt (Co) single atoms anchored in porous nitrogen-doped carbon nanoflake arrays, synthesized from Co-MOF precursor and followed by removal of the unwanted Co clusters. The well-dispersed Co single atoms are attached to the carbon network through N–Co bonding, where there is extra porosity and active surface area created by the removal of the Co metal clusters. Interestingly, compared with those electrocatalysts containing excess Co nanoparticles, a single Co atom alone demonstrates a lower oxygen evolution reaction (OER) overpotential and much higher oxygen reduction reaction (ORR) saturation current, showing that the Co metal clusters are redundant in driving both OER and ORR. Given the bifunctional electrocatalytic activity and mechanical flexibility, the electrocatalyst assembled on carbon cloth is employed as the air cathode in a solid-state Zn–air battery, which presents good cycling stabilities (2500 min, 125 cycles) as well as a high open circuit potential (1.411 V).
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