Electrochemical Oxidation of Nitrogen towards Direct Nitrate Production on Spinel Oxides

Abstract

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Protagonists and spectators during photocatalytic solar water splitting with SrTaOxNy oxynitride

“…Dai et al 40 recently looked at the nitrogen oxidation reaction (NOR) catalysed by Fe/Co spinel oxides in alkaline electrolyte. Where they show that adsorbed N 2 is oxidised to intermediate NO x species by the adsorbed OH and the OER intermediate O(OOH) according to eqn (3) and (4):…”

“…This supercial CoO(OH) enriched surface layer has a benecial effect on the OER for the oxides. 40,41 However, in the presence of surface nitrogen based species, the stabilised CoO(OH) contribute to both the NOR and OER. 40 Kato and Kudo 42 looked at numerous tantalate oxide photocatalysts, and the authors observed nitrate reduction under UV irradiation in an aqueous environment.…”

Electrosynthesis of Nitrate via the Oxidation of Nitrogen on Tensile‐Strained Palladium Porous Nanosheets

“…[5] Very recently, Xu and Zhang et al further validated the promising potential of this strategy by adopting spinel oxide and Fe-SnO 2 as electrocatalysts. [6] However, the competitive oxygen evolution reaction (OER) and the complicated fiveelectron oxidation course retarded the development of this technology. Moreover, the structure of electrocatalysts may evolve during the electrooxidation process, and thus probing the active species for NOR is critical for the rational design and synthesis of efficient nitrogen-to-nitrate electrocatalysts.…”

Rational design on photo(electro)catalysts for artificial nitrogen looping

“…Reproduced with permission: Copyright 2020, Wiley-VCH. Co 2−x O 4 spinel oxides were also utilized as catalysts to carry out electrocatalytic NOR,123 which achieved the direct synthesis of nitrate with high yield (130 ± 12 μmol/ hr/g MO at 1.6 V vs RHE) by iron catalysts (Figure8B,C). Besides, modified MXene electrocatalysts have also been utilized as electrocatalyst for NOR, which achieved 2.80 μg/hr/mg cat yield of nitrate (Figure…”

“…123 D, Scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy images of prepared Pd-MXene, respectively. Reproduced with permission: Copyright 2020, The Royal Society of Chemistry124 Currently, the main catalysts are metal oxides and their composites.…”