Journal
ADVANCED FUNCTIONAL MATERIALS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202307010
Keywords
acid media; electrocatalysts; heterojunction; oxygen evolution reaction
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Developing green hydrogen energy has driven the progress of proton-exchange membrane water electrolyzers (PEMWE). However, finding cost-effective acidic catalysts for the complex oxygen evolution reaction (OER) in an acidic environment remains a challenging task. In this study, hexagonal-shaped and defect-rich MnOx/RuO2 heterojunction nanosheets (H/d-MnOx/RuO2) were designed, showing efficient performance with low overpotential.
Developing green hydrogen energy to power future societies has driven the progress of proton-exchange membrane water electrolyzers (PEMWE). However, due to the complex anode oxygen evolution reaction (OER) electron transfer process and the strong acidic environment, the most effective catalysts are still Ir-based nanomaterials. Therefore, exploiting low cost acidic OER catalysts to meet the needs of PEMWE remains a challenging and rewarding task. Herein, hexagonal-shaped and defect-rich MnOx/RuO2 heterojunction nanosheets (H/d-MnOx/RuO2) is designed. The oxygen vacancies and heterogeneous structure enable the H/d-MnOx/RuO2 catalyst to reach 10 mA cm(-2) with only overpotential 178 mV in 0.5 m H2SO4. Density functional theory shows that the oxygen vacancies and heterogeneous interface facilitates the reduction of the adsorption energy of *OOH and the reduction of the energy level of Ru-Oads, thus suppressing the involvement of lattice oxygen and enhancing the durability. This study provides an effective way to design efficient catalysts for hydrogen production in PEMWE.
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