Journal
APPLIED SURFACE SCIENCE
Volume 582, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.152442
Keywords
Defect-rich carbon; Electron-deficient palladium; Oxygen vacancy; Zn-air battery
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1A2C2010445]
- MSIT (Ministry of Science and ICT), Korea, under the ITRC (Information Technology Research Center) [IITP-2020-2020-0-01655]
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The use of defect-rich carbon with oxidized palladium and cobalt oxide improves the oxygen reduction and evolution reactions in zinc-air batteries, resulting in superior catalytic activity and stability.
Using defect-rich carbon with slightly oxidized palladium and oxygen-vacancy-induced cobalt oxide from ZIF-67 improves the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), which are crucial reactions for air cathodes of desirable Zn-air batteries. Electron-deficient palladium and free electron at oxygen vacancies facilitate the adsorption of oxygen species, thereby enhancing the OER performance. Moreover, hybridization of defect-rich N-doped carbon with catalytically active Pd nanoparticles advances the ORR activity. Through a delicate synthetic method, we synthesized the bi-functional catalysts, Pd and CoOx embedded in defect-rich and N-doped carbon materials (Pd/CoOx/d-NC), for rechargeable Zn-air battery. Pd/CoOx/d-NC exhibits superior activities and robust durability for both the ORR and OER. In addition, it shows higher performance than the benchmark Pt/C + IrO2 when applied to the Zn-air battery. The robust durability for ORR and OER of Pd/CoOx/d-NC results in charge-discharge cycle stability. The outstanding catalytic activities and stable cycle life of Pd/CoOx/d-NC verifies its potential as a catalyst for air cathode in practical Zn-air battery application.
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