Journal
ELECTROCHIMICA ACTA
Volume 295, Issue -, Pages 966-977Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.11.142
Keywords
Oxygen evolution reaction; Oxygen reduction reaction; Zinc-air battery; Metal organic framework; Co-CoO-Co3O4/N-doped carbon
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Funding
- National Natural Science Foundation of China [21706010, 21276018]
- Natural Science Foundation of Jiangsu Province of China [BK20161200]
- Fundamental Research Funds for the Central Universities [buctrc201526, PYCC1706]
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University [ACGM2016-06-02, ACGM2016-06-03]
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Electrocatalysts with high activity toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are essential and desired for metal-air batteries, fuel cells, water-splitting and CO2 reduction. Here, a series of Co-CoxO/N-doped Carbon (NC) is developed as bifunctional electrocatalysts via the pyrolysis of a simple physical mixture of cobalt-based metal-organic framework (MOF) and carbon black (CB). The obtained electrocatalysts exhibit considerably enhanced bifunctional activity as compared to the pure MOF derived counterpart. The essential roles of added CB in boosting the bifunctional activity are investigated. With the addition of CB, the surface concentrations of active pyridinic-N and graphitic-N for ORR and the surface CoIII/CoII ratios for OER are increased. Furthermore, the charge transfer efficiency and the electrochemically active surface areas (ECSAs) are also enhanced for the resulting electrocatalyst. The optimized Co-CoO-Co3O4/NC exhibits excellent bifunctional activity and durability, surpassing the commercial 20 wt% Pt/C (for ORR) and IrO2 (for OER). When applied in an air electrode, the corresponding Zn-air battery with Co-CoO-Co3O4/NC presents the better performance than that with 20 wt% Pt/C. (C) 2018 Elsevier Ltd. All rights reserved.
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