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Copper Selenide Nanosheet with Adjustable Cation Vacancy for Boosting Nitrogen Electroreduction
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DOI：10.1021/acsami.5c20585.png)
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Abstract
En 中文
The electrochemical nitrogen reduction reaction (NRR) offers a sustainable pathway for ammonia synthesis under ambient conditions. Among these, vacancy engineering has emerged as an effective approach to accelerate nitrogen-to-ammonia conversion and enhance electrocatalytic performance. However, the controllable synthesis of catalysts with precise cation vacancy concentrations remains a significant challenge. In this study, we address this by employing a combined thermal treatment and plasma approach to fabricate copper selenide nanosheets with precisely tuned copper vacancy (VCu) concentrations. The resulting p-Cu1.8Se/Cu2Se/C-5 catalyst, possessing the highest VCu concentration, demonstrated superior NRR activity, achieving an NH3 production rate of 21.81 mu g h-1 mgcat. -1 at -0.7 V vs the reversible hydrogen electrode (RHE), a value more than 3-fold higher than that of its vacancy-free counterpart. These results indicate that VCu sites serve as active centers that optimize nitrogen adsorption and activation, thereby significantly lowering the energy barrier of the rate-determining step. This work provides a new avenue for designing next-generation, high-performance NRR electrocatalysts through precise defect engineering.
Keywords:
metal-organic framework derivative
cation vacancy
plasma etching
nitrogen reductionreaction
defect engineering
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Papers:
65
Citations:
1