A novel composite coating of Mn3O4@TiO2 for balanced electrochemical and catalytic performance
Rosy Amalia Kurnia Putri, Wail Al Zoubi, Young Gun Ko*

School of Materials Science and Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea

Abstract

Metal oxide-based catalysts have attracted considerable interest owing to the highly efficient catalytic reactions during the degradation of organic compounds. However, the majority of catalysts in the form of powder suffer from aggregation and sintering on the surface of support, resulting in a significant loss in catalytic activity with increasing catalytic cycles. This work outlined the fabrication of Mn3O4@TiO2 composite coating via electron enhanced plasma electrolysis (EEPE) for electrochemical stability and catalytic application. The catalytic performance revealed that the composite coating outperforms most catalyst among the reported cases in terms of efficiency reaching nearly 100% and reusability up to five cycles. In addition, the composite coating demonstrates electrochemical stability against corrosive environment, which display the dual-features together on account of a synergy between the active species of Mn3O4 and TiO2 as a support. The mechanism of electron transfer between a catalyst surface and free radical molecules were discussed in relation to the efficiency and stability of the composite coating toward the degradation of methylene blue.

Keywords: metal oxide, catalyst, electrochemical stability, composite, degradation

Topic: Industrial and Engineering Chemistry