Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 1, Pages 343-350Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b05492
Keywords
Oxygen reduction; Nitrogen-doped graphene; Zinc-air batteries; Cobalt oxide
Categories
Funding
- National Natural Science Foundation of China [21705058]
- Six Talent Peaks Project of Jiangsu Province [XNY-009]
- Provincial Natural Science Foundation of Jiangsu [BK20170524]
- Chinese Postdoctoral Foundation [2018T110450]
- High-tech Research Key laboratory of Zhenjiang [SS2018002]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Environmentally friendly and inexpensive oxygen catalysts with high-efficient activity are paramount for powering zinc-air batteries. Here, cobalt oxide nanoparticles confined in nitrogen-doped graphene (CoO/NG) were produced as the oxygen reduction electrocatalyst for zinc-air batteries by hydro thermal and high-temperature calcination. During the hydro thermal process, the graphitic carbon nitride as the self-sacrificing template can be partially converted into a carbanion (CO32-) in the presence of cobalt-based ionic liquid ([N-1444]Cl/CoCl2), which can generate cobalt carbonate (CoCO3) with Co2+. During the high-temperature calcination, CoCO3 is decomposed into CoO embedded into nitrogen-doped graphene and escaped CO2, which can increase specific surface areas of oxygen reduction electrocatalysts. The as-prepared CoO/NG shows not only abundant mesoporous structures but also large specific surface area. The CoO/NG exhibits outstanding oxygen reduction performance (E-12 approximate to 0.830 V versus RHE). Additionally, the zinc-air battery manufactured by CoO/NG generates a specific capacity of 815.6 mA h g(-1). It is verified that the CoO/NG catalyst as the air-cathode is promising in actual application of zinc air batteries.
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