Efficient ammonia synthesis via electroreduction of nitrite using single-atom Ru-doped Cu nanowire arrays

Abstract

Here, we report the highly active and selective electrocatalytic reduction of NO2- ionic to value-added NH3 over a single atom Ru-modified Cu nanowire array on a three-dimensional copper foam (Ru-Cu...

Roles of Copper in Nitrate Reduction at Copper-Modified Ru/C Catalysts

“…Recent studies by Tran et al and Zhang et al revealed that the activity for subsequent NO 2 – /NO reduction at Cu–Ru catalysts can be improved as a result of the reduced barrier of the PDS and RDS; , this is consistent with our result in nitrite reduction. For pure Cu electrodes, the reduction of nitrite to NH 3 is proceeding via *NOH/*NHO process in alkaline media. ,− Wang et al calculated the thermodynamic and kinetic parameters of the nitrate reduction at Cu electrode.…”

“…Recent studies by Tran et al and Zhang et al revealed that the activity for subsequent NO 2 – /NO reduction at Cu–Ru catalysts can be improved as a result of the reduced barrier of the PDS and RDS; , this is consistent with our result in nitrite reduction. For pure Cu electrodes, the reduction of nitrite to NH 3 is proceeding via *NOH/*NHO process in alkaline media. ,− Wang et al calculated the thermodynamic and kinetic parameters of the nitrate reduction at Cu electrode. On the Cu(111), the PDS of *NOH pathway is the reduction of *NO to *NOH, and the *NHO pathway is the reduction of *NH 2 O to *NH 2 OH, with the same △G of 0.18 eV; on the Cu(100), the PDS of *NOH process is the reduction of *NO to *NOH with a △G of 0.21 eV, which is slightly higher than the other pathway (0.16 eV).…”

“…Recent studies by /NO reduction at Cu−Ru catalysts can be improved as a result of the reduced barrier of the PDS and RDS; 63,64 this is consistent with our result in nitrite reduction. For pure Cu electrodes, the reduction of nitrite to NH 3 is proceeding via *NOH/*NHO process in alkaline media.…”

NiWO4nanoparticles with oxygen vacancies: high-efficiency electrosynthesis of ammonia with selective reduction of nitrite

“…In contrast, nitrite/nitrate has lower solvation energy and higher water solubility, making it a better nitrogen source for electrochemical ammonia synthesis. [16][17][18][19][20][21][22][23][24][25][26] In recent years, industrial wastewater discharge has led to a significant accumulation of nitrite, severely threatening human health. [27][28][29] So far, the electrochemical conversion of nitrite not only removes waste nitrite but also produces NH 3 , a wasteto-energy solution.…”

Cobalt-Nanoparticles-Decorated 3D Porous Nitrogen-Doped Carbon Network for Electrocatalytic Nitrite Reduction to Ammonia

“…Noble-metal-based catalysts exhibit high catalytic activity toward NO 2 – RR, but their limited availability and high expense pose challenges for widespread use. − Researchers have thus concentrated their efforts on exploring earth-abundant transition-metal-based alternatives, with specific attention on cobalt (Co)-based catalysts. − Homogeneous Co macrocyclic catalysts can drive the six-electron NO 2 – RR, but they often suffer from limited NH 3 yield and separation difficulties. − To address these limitations, we have developed a heterogeneous catalyst consisting of Co-nanoparticle-decorated 1D tubular fibers that demonstrates high efficiency for NH 3 generation . A poly­(vinylpyrrolidone) (PVP)-blowing method is typically employed to fabricate 3D porous nitrogen (N)-doped carbon network comprised of layer-to-layer interconnected 2D carbon nanosheets, which facilitates the exposure of more electrochemically active surfaces, resulting in enhanced performance for applications. − It is thus expected that Co/3D porous N-doped carbon network could be an efficient NO 2 – RR catalyst for NH 3 electrosynthesis.…”