Synthesis of self-renewing Fe(0)-dispersed ordered mesoporous carbon for electrocatalytic reduction of nitrates to nitrogen

Iron‐Based Nanocatalysts for Electrochemical Nitrate Reduction

“…Because of its unstable 3D orbit, iron is a relatively active transition metal compared to other highly active metal catalysts for nitrate reduction, such as copper-based Copper and other metals may exhibit strong NOH* adsorption and weak NH 3 * adsorption compared to iron, and tend to produce ammonia due to differences in coordination environment and electronic states of surface atoms. [56][57][58][59]…”

“…Based on environmental concerns, most studies in the published literature prefer to obtain N 2 as the final product, which is nontoxic and harmless and can be directly emitted into the atmosphere. [57,[133][134][135][136][137][138] According to the "breakpoint chlorination" theory combined with the mechanism diagram analysis, ClOcan react with NH 4…”

“…Although a variety of iron-based nanocatalysts have achieved relatively high nitrogen selectivity for nitrate conversion, the nitrogen selectivity in some catalytic systems, such as Fe(0)dispersed ordered mesoporous carbon, is close to 100 percent (Figure 9a-c), the utilization value of N 2 is not high in terms of active nitrogen utilization rate. [57] When compared to N 2 reduction, electrochemical NO 3 RR produces more ammonia (NH 3 ) and has a higher Faradaic efficiency, which is an important component in agriculture and a promising clean energy source as a hydrogen carrier. Under realistic conditions of massive global energy consumption, nitrate, as a rich nitrogen source, is expected to turn waste into treasure through product directional regulation.…”

“…Reproduced with permission. [57] Copyright 2022, Elsevier. d) SEM, e) selectivity from −0.2 to −0.6 V in 0.1 m KNO 3 aqueous electrolyte, and f) electrocatalytic NO 3 RR activity of Fe-cyano-R NSs.…”

Mesoporous carbon-based materials and their applications as non-precious metal electrocatalysts in the oxygen reduction reaction

“…1(b), with diameters varying from 4.4 to 13.0 nm depending on the calcination temperature and metal ion (nickel) concentrations. Other commonly used cross-linking ions are Fe(III) [59].…”