Titanium-based catalysts are needed to achieve electrocatalytic N reduction to NH with a large NH yield and a high Faradaic efficiency (FE). One of the cheapest and most abundant metals on earth, iron, is an effective dopant for greatly improving the nitrogen reduction reaction (NRR) performance of TiO nanoparticles in ambient N -to-NH conversion. In 0.5 m LiClO , Fe-doped TiO catalyst attains a high FE of 25.6 % and a large NH yield of 25.47 μg h mg at -0.40 V versus a reversible hydrogen electrode. This performance compares favorably to those of all previously reported titanium- and iron-based NRR electrocatalysts in aqueous media. The catalytic mechanism is further probed with theoretical calculations.
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