Abstract
Advanced catalysts for clean hydrogen generation and storage offer an attractive possibility for developing a sustainable and ecofriendly future energy system. Transition metal oxides (TMO) are appealing candidates to be largely considered as electrode catalysts. However, for practical applications, there are still challenges—the intrinsic catalytic properties of TMOs should be further improved and TMOs should be synthesized by practical routes for cost-effective and scalable production of catalysts. Therefore, finding promising ways to fabricate highly active TMOs with outstanding electrochemical hydrogen evolution performance is required. Here, we present a direct and facile synthetic approach to successfully provide highly efficient MoO3−X catalysts with electrochemically active oxygen vacancies through a one-step thermal activation process on a Mo metal mesh. Variations in the oxidation states of molybdenum oxides can significantly increase the active sites of the catalysts and improve the electrochemical activity, making these oxide compounds suitable for hydrogen evolution reaction (HER). Compared to the bare Mo mesh and fully oxidized Mo (MoO3) electrodes, the fabricated MoO3−X electrode exhibits better electrochemical performance in terms of overpotentials and Tafel slope, as well as the electrochemical 1000 cycling stability, confirming the improved HER performance of MoO3−X. This provides new insight into the simple procedure suitable for the large-production supply.
Highlights
IntroductionIt is expected that hydrogen gas and corresponding energy applications from water-splitting reactions should be capable of providing both high energy capacity and renewable (ecofriendly) resources [1,2,3]
The development of new materials for efficient energy generation is of paramount importance in order to meet ever-increasing energy demands and to provide environmentally friendly energy sources.It is expected that hydrogen gas and corresponding energy applications from water-splitting reactions should be capable of providing both high energy capacity and renewable resources [1,2,3].Further research on catalytic electrode materials for an efficient hydrogen evolution reaction (HER) are needed to maximize its catalytic performance
Earth abundant transition metal-based oxides (TMOs) have emerged as promising alternative electrocatalysts for noble metal replacement based on theories and experiments on their metal active sites, electrical structures, and surface properties
Summary
It is expected that hydrogen gas and corresponding energy applications from water-splitting reactions should be capable of providing both high energy capacity and renewable (ecofriendly) resources [1,2,3]. Further research on catalytic electrode materials for an efficient hydrogen evolution reaction (HER) are needed to maximize its catalytic performance. Earth abundant transition metal-based oxides (TMOs) have emerged as promising alternative electrocatalysts for noble metal replacement based on theories and experiments on their metal active sites, electrical structures, and surface properties. Those electrode materials have demonstrated their catalytic efficiency and high catalyst stability during. There are still a lot of challenges involved in using these materials as industrial electrode candidates due to their relatively low catalyst performance compared
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