Ru/La2S3 nanorods as an electrocatalyst for efficient N2 fixation under ambient conditions?

Reaction Chemistry & Engineering Pub Date: 2023-05-10 DOI: 10.1039/D3RE00123G

Abstract

Electrochemical ammonia synthesis has advantages over the conventional Haber–Bosch process in terms of environment friendliness, sustainability, and cleanliness. However, this process is facing challenges such as low ammonia yield and low Faraday efficiency due to the low solubility and the difficulty in activation of nitrogen in aqueous solutions. To overcome these limitations, finding a catalyst of high efficiency, stability, and selectivity is crucial. Inspired by the concept of noble metal doping and two-dimensional layered catalysts, we have designed a novel catalyst for nitrogen reduction by incorporating ruthenium into lanthanum sulfide. In this context, the inclusion of ruthenium serves to optimize the electron transfer interface, enhance the low conductivity of lanthanum sulfide, and increase the number of active sites. Furthermore, the synergistic effect between the ruthenium and lanthanum ions significantly improves the activity of the catalyst. As a catalyst for the N2 reduction reaction (NRR), Ru/La2S3 demonstrates a superior NH3 formation rate of 19.40 μg h?1 mgcat?1 and a faradaic efficiency of 7.77% at ?0.5 V versus the reversible hydrogen electrode (RHE). These values are significantly higher compared to those of La2O3 (1.4%; 12.5 μg h?1 mgcat?1) and La2S3 (2.3%; 10.7 μg h?1 mgcat?1), and most reported values in this field.

Graphical abstract: Ru/La2S3 nanorods as an electrocatalyst for efficient N2 fixation under ambient conditions
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