期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 47, 期 12, 页码 7949-7960出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.12.118
关键词
Carbon based electrocatalysts; Non-noble metal electrocatalysts; Oxygen reduction reaction; Zinc-air battery
资金
- National Natural Science Foundation of China [21406191]
- Natural Science Foundation of Hebei Province [B2018203297]
- Youth Top-notch Talent Support Program of Higher Education in Hebei Province [BJ2016053]
- Youth Independent Project of Yanshan University [13LGA015]
- Open Project Program of Key Laboratory of Preparation and Application of Environmentally Friendly Materials (Jilin Normal University), Ministry of Education, China [2017009]
Bamboo-like carbonitride nanotubes with high-density multi-type active sites are synthesized to omni-directionally utilize carbon-based material in nanoscale and improve its catalytic activity. The CoO@Co-N-bCNT electrocatalyst exhibits high catalytic activity for ORR with high stability, showing great potential for practical applications.
To omni-directionally utilize carbon-based material in nanoscale and improve its catalytic activity for oxygen reduction reaction (ORR), bamboo-like carbonitride nanotubes (bCNTs) with high-density multi-type active sites (CoO@Co-N-bCNT) are facilely synthesized via a multi-step method referring to thermal pyrolysis of Co2+ complexed melamine, acid leaching and second annealing. Multi-type active sites including encapsulated Co nanoparticles, intercalated Co/CoO species, Co-N x coordinated sites and defect-rich surface are present in the as-prepared CoO@Co-N-bCNT electrocatalyst. The types and densities of these active sites are easily tuned via the ratio of melamine to Co2+ in precursors and subsequent treatment. Due to the high-density multi-type active sites and bamboo-like tubular structure, CoO@Co-N-bCNT electrocatalyst exhibits high catalytic activity for ORR with high stability in both alkaline and acid electrolytes. Quasi-solid-state zinc air battery (ZAB) assembled with the CoO@Co-N-bCNT as the cathode exhibits open circle voltage of 1.39 V and peak power density of 14.9 mW cm(-2). Two-cell series of quasi-solid-state ZABs can light LED indicator for 7 h, suggesting its promising practical application. The studies provide facile strategy to design the carbon-based electrocatalysts with high performance and tune their active sites. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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