Nitrogen Cycle Electrocatalysis

Understanding the Role of Hyponitrite in Nitric Oxide Reduction

“…18 Even before these challenges were recognized, though, there had been considerable interest in understanding the mechanism of heterogeneous NO reduction in catalytic converters. [20][21][22][23][24][25] Many research groups have examined this reaction, and the generally accepted mechanism is thought to involve initial NO dissociation to form surface bound nitride and oxide (Scheme 1a). 18,[24][25][26][27][28][29][30][31] However, more recent experimental work suggests an 4 alternate mechanism could also be operative.…”

Voltammetric determination of nitrate in water samples at copper modified bismuth bulk electrode

“…However, only the reduction peak of NO À 3 can be found at BiB/Cu electrode in deoxygenating solution. As far as the electrode reactions are concerned, the thermodynamically preferred product of NO À 2 reduction is N 2 , but other products such as NO, N 2 O, hydroxylamine and ammonium are also formed [38]. The transformation of product in deoxygenating solution may cause the shift of the reduction peak of NO À 2 .…”

Nitrate and Nitrite Electrocatalytic Reduction at Layer-by-Layer Films Composed of Dawson-type Heteropolyanions Mono-substituted with Transitional Metal Ions and Silver Nanoparticles

“…Being preferred for economical reasons, physico-chemical techniques such as ion exchange, reverse osmosis and electrodialysis do not convert nitrate to harmless compounds but only remove it from the water. Heterogeneously catalyzed nitrate reduction reaction (NRR) to nitrogen for groundwater remediation has been developed [18][19][20] as one of the alternatives. Biological denitrification is costly, complex and a slow process accompanied with a co-production of large quantities of sludge [4 382].…”

“…Electrochemical techniques of denitrification via NRR have attracted special interest because of the possibility of operation in high nitrate concentrations [4,20]. The electrode materials that reveal high activity in NRR are limited to noble metals and their bimetallic alloys [4,20] as well as graphene [21].…”

“…The electrode materials that reveal high activity in NRR are limited to noble metals and their bimetallic alloys [4,20] as well as graphene [21]. However, most of these electrocatalytical systems require high acidity [4] or alkalinity [22,23] for effective NRR.…”