5 years ago

IrO2–ZnO Hybrid Nanoparticles as Highly Efficient Trifunctional Electrocatalysts

IrO2–ZnO Hybrid Nanoparticles as Highly Efficient Trifunctional Electrocatalysts
Ik Seon Kwon, Jundong Kim, Kidong Park, Jin-Gyu Kim, Jeunghee Park, Seung Jo Yoo, Inhye Kwak, Jae-Pyoung Ahn
Development of high-performance catalysts is very crucial for the commercialization of sustainable energy conversion technologies. Searching for stable, highly active, and low-cost multifunctional catalysts has become a critical issue. In this study, we report the synthesis of IrO2–ZnO hybrid nanoparticles and their highly efficient electrocatalytic activities toward oxygen/hydrogen evolution reaction (OER/HER) as well as oxygen reduction reaction (ORR). For comparison, we synthesized RuO2–ZnO, showing a smaller catalytic activity than IrO2–ZnO, which provides robust evidence for the unique synergic effect of these hybrid structures. IrO2–ZnO and RuO2–ZnO exhibit excellent OER catalytic performance with Tafel slopes of 57 and 59 mV decade–1, respectively. For HER, IrO2–ZnO shows a higher catalytic activity than RuO2–ZnO. The numbers of electrons involved in the ORR were 3.7 and 2.8, respectively, for IrO2–ZnO and RuO2–ZnO. The remarkable catalytic performance of IrO2–ZnO would be ascribed to the abundant oxygen vacancies and the metallic states of Ir, which ensure excellent catalytic activity and stability.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b03844

DOI: 10.1021/acs.jpcc.7b03844

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