The MnO2–Ti3C2Tx MXene nanohybrid is efficient for ambient electrocatalytic N2-to-NH3 fixation with an NH3 yield of 34.12 μg h−1 mgcat−1 and a faradaic efficiency of 11.39%.
WO3 nanosheets rich in oxygen vacancies are efficient for electrocatalytic N2-to-NH3 fixation under ambient conditions with a NH3 yield of 17.28 μg h−1 mgcat.−1 and a faradaic efficiency of 7.0% in 0.1 M HCl.
Industrial ammonia production depends heavily on the traditional Haber−Bosch method at the expense of CO 2 emissions and large energy consumptions. Artificial fixation of nitrogen to ammonia is therefore regarded as a promising path to yield ammonia in energy-saving conditions. However, a competent electrocatalyst is highly desired, owing to the extremely stable bond of NN. In this work, we report Fe 2 (MoO 4 ) 3 nanoparticles as a non-noble-metal electrocatalyst, inspired by nitrogenase enzymes for electrochemically converting nitrogen into ammonia, which achieves a Faradic efficiency of 9.1% and an excellent NH 3 yield of 18.16 μg h −1 mg −1 cat in 0.1 M sodium sulfate at −0.6 V vs reversible hydrogen electrode. Also, it has a better ammonia yield rate of 20.09 μg h −1 mg −1 cat in 0.1 M hydrochloric acid. Moreover, this noblemetal-free catalyst exhibits a unique reaction process selectivity and stability compared with the other catalysts working in harsh conditions. The specific reaction processes are analyzed by density functional theoretical calculations to gain insights into the nitrogen reduction reaction (NRR) by this catalyst.
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