Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 41, Pages 37701-37707Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b12232
Keywords
Janus air electrode; bifunctional electrocatalyst; selective electrodeposition; excellent rechargeability; zinc-air battery
Funding
- National Natural Science Foundation of China [21776154]
- China-Japan Key Science and Technology Cooperation Program [2018YFE0202001]
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MnO2 has been considered as the most promising bifunctional electrocatalyst toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Despite their highly active ORR performance, the OER catalytic activity of MnO2 species is still far from satisfying. Herein, for the first time, highly active OER catalytic NiFe layered double hydroxides (NiFe LDHs) are combined with MnO2 via a selective electrodeposition method to form a Janus electrode in which the MnO2 and NiFe LDHs are in situ grown on two sides of a porous nickel foam (MnO2-NiFe/Ni). The MnO2-NiFe/Ni electrode exhibits excellent bifunctional catalytic activity and stability for both ORR and OER compared to bare MnO2 on account of the rational design of the Janus bifunctional configuration separating OER and ORR active materials. Moreover, such a Janus MnO2-NiFe air electrode endows the zinc-air battery with better cycling stability and energy efficiency than the bare MnO2 electrode. Our work demonstrates a novel Janus electrode configuration to design high-performance electrocatalysts for energy storage and conversion applications.
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