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- Title
Bifunctional mesoporous CoO/nitrogen‐incorporated graphene electrocatalysts for high‐power and long‐term stability of rechargeable zinc‐air batteries.
- Authors
Park, Tae Ho; Yeon, Jeong Seok; Sivakumar, Periyasamy; Kim, Youngkwon; Park, Ho Seok
- Abstract
Summary: Despite high energy density, low‐cost, and ecofriendly, rechargeable Zinc‐air batteries (ZABs) suffer from sluggish kinetics stability during oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) at the cathode. Herein, we demonstrate CoO nanoparticles anchored on N‐doped reduced graphene oxide (CoO/N‐rGO) with an excellent bifunctional catalytic activity and stability and facile redox kinetics of ORR and OER for high‐performance rechargeable ZABs. The CoO/N‐rGO catalysts are featured with the abundant active sites, a large accessible area, and high electrochemical conductivity, which are associated with increased oxygen vacancy surface, reduced valence, and mesoporous architecture. The half‐wave potential (E1/2) and electron transfer number for ORR are 0.79 V and 3.72 at 0.40 V (vs RHE), respectively, while OER potential at 10 mA cm−2 (Ej = 10) is 1.61 V (vs RHE). Remarkably, the ZAB cell with CoO/N‐rGO achieves high specific capacity of 545 mAh gzn−1, power density of 41 mW cm−2, and cyclic stabilities with high energy efficiency of 64.44% at 2 mA cm−2. In addition, postmortem analysis validates that the oxidation and aggregation of CoO/N‐rGO catalyst is mitigated while the inactivation of Zn anode is inhibited.
- Subjects
OXYGEN evolution reactions; STORAGE batteries; ALKALINE batteries; CATALYTIC activity; POWER density; ELECTROCATALYSTS; GRAPHENE; ANODES
- Publication
International Journal of Energy Research, 2021, Vol 45, Issue 5, p6698
- ISSN
0363-907X
- Publication type
Article
- DOI
10.1002/er.6263