2023年日本表面真空学会学術講演会

講演情報

口頭発表

[1Ga01-10] Thin Film (TF)

2023年10月31日(火) 09:45 〜 12:30 中会議室231 (3階)

Chair:中塚 理(名古屋大学)

11:30 〜 11:45

[1Ga07] Low-potential-application-induced activity recovery observed in LiNi0.5Mn1.5O4(111) thin film catalysts for oxygen evolution reaction

*Kentaro Hatagami1, Kazunori Nishio1, Ryota Shimizu2, Taro Hitosugi1,2 (1. Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2. Department of Chemistry, School of Science, University of Tokyo)

Cathode materials in Li-ion secondary batteries have attracted much attention as oxygen evolution reaction (OER) catalysts in water splitting. In this study, we focused on LiNi0.5Mn1.5O4 (LNMO) among the cathode materials. We utilized LNMO(111)/Au(111)/Al2O3(0001) oriented thin films to define the reaction area. OER was performed on the LNMO(111) thin film by sweeping the potential to +2.0 V vs. reversible hydrogen electrode (RHE) (pH 13.0). While a current density of 15.7 mAcm-2 was obtained in the first cycle, the current density decreased to 6.70 mAcm-2 in the eighth cycle, suggesting the degradation of OER activity. Surprisingly, we found that the OER activity was recovered to 16.5 mAcm-2 by applying a low-potential to -0.8 V vs. RHE, and then re-sweeping to +2.0 V vs. RHE.

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