Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 51, Pages 61098-61106Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c18081
Keywords
oxygen reduction reaction; oxygen evolution reaction; perovskite oxide; Zn-air battery; electronic structure regulation
Funding
- PhD Fellowship of Research Grant Council, University Grants Committee, HK SAR
- Collaborative Research Fund (CRF) of Research Grant Council, University Grants Committee, HK SAR [C5031-20G]
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The bifunctional electrocatalyst LSMC-Ru shows outstanding activity with a low dose of ruthenium, achieving synergy between ORR and OER through electronic interaction. It delivers excellent performance and cycling stability in Zn-air battery applications.
La0.8Sr0.2Mn0.5Co0.5O3 (LSMC) perovskite anchored with RuOx (LSMC-Ru) is fabricated as a new bifunctional electrocatalyst, with low dosage (2.43 wt %) and high utilization of noble metal Ru. The LSMC-Ru exhibits outstanding bifunctional activity with a low potential gap of 0.72 V between the oxygen evolution reaction (OER) potential at 10 mA cm(-2) and the oxygen reduction reaction (ORR) half-wave potential. The strong electronic interaction between RuOx and LSMC is confirmed by both experiments and theoretical calculations. Consequently, the electron-rich Mn centers promote ORR, while the electron-deficient Ru centers facilitate OER. A Zn-air battery using the LSMC-Ru air electrode delivers a peak power density of 159 mINT cm(-2) and a low charge-discharge potential gap of 0.58 V at 2 mA cm(-2). The high round-trip energy efficiency of 60.6% is retained after 300 cycles. This strategy of anchoring a low dosage noble metal catalyst to perovskite can be extended to other systems of noble metal-non-noble metal composite electrocatalysts to achieve both competitive performance and low cost.
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