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Atomically Ordered RuGa Intermetallic Electrocatalyst Enables High-Efficiency Nitrate-to-Ammonia Conversion
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DOI：10.1002/adfm.202524120.png)
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Abstract
En 中文
Electrocatalytic nitrate reduction represents a green and sustainable route for ammonia synthesis. However, its practical application is still hindered by unsatisfactory selectivity, activity, energy efficiency, and stability, especially under low nitrate concentrations. Here a carbon-supported atomically ordered ruthenium-gallium intermetallic compound (RuGa IMC/C) is reported, characterized by orderly isolated Ru sites surrounded by catalytically inert Ga, which can serve as a highly efficient cathodic catalyst for nitrate-to-ammonia reduction, achieving a remarkable ammonia yield rate of 31.73 mg h−1 mgRu−1 and an ammonia Faradaic efficiency of 97.03% as well as half-cell energy efficiency of 40.94% at an ultralow potential of −0.05 V under a low nitrate concentration of 2000 ppm (0.032 M). Impressively, the RuGa IMC/C catalyst exhibits excellent Faradaic efficiencies (>90%) across a wide range of nitrate concentrations from 0.01 to 0.1 M at 0 V and a superior stability. Theoretical calculations reveal that incorporating Ga into Ru causes a shift of the d-band toward the Fermi level, optimizing the adsorption and activation of N-containing intermediates while suppressing the competing hydrogen evolution reaction on the RuGa IMC/C. Furthermore, the assembled zinc–nitrate battery displays a maximum power density of 52.74 mW cm−2 and a long-term durability of over 300 h.
Keywords:
intermetallic electrocatalyst
nitrate reduction to ammonia
stability
suppression of hydrogen evolution
zinc-nitrate battery
Journal
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19
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3.4W
Citations:
32.1W
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