High-efficiency electrosynthesis of ammonia with selective reduction of nitrite over an Ag nanoparticle-decorated TiO₂ nanoribbon array

Abstract

Electrochemical nitrite (NO2–) reduction can yield value-added ammonia (NH3) while remove NO2– as enviromental pollutant in wastewater; however, it involves six-electron transfer process and requires highly efficient and selective electrocatalysts....

Core–shell heterojunction engineering of Co3O4/NiFe LDH nanosheets as bifunctional electrocatalysts for efficient reduction of nitrite to ammonia

“…NH 3 is one of the most essential industrial raw materials for synthesizing substantially all nitrogen-based fertilizers, accounting for 5% of the chemical market value. [1][2][3] Recently, NH 3 has also been acknowledged as an intriguing carbon-free energy carrier due to the merits of competitive delivery cost, large hydrogen capacity, and excellent energy density. 4 However, with the unceasing employment of the industrial Haber-Bosch route for NH 3 production characterized by high energy consumption and large carbon dioxide emission, the global energy crisis will inevitably be aggravated and the achievement of carbon neutrality will be hindered.…”

“…1 In contrast to the extensively studied electrochemical N 2 reduction system with bleak performance, the electrocatalytic NO 2 − reduction reaction (NO 2 − RR) has cast new light on renewable NH 3 synthesis as NO 2 − exhibits substantially increased solubility in water and lower cleavage energy than N 2 . [2][3][4] In addition, NO 2 − represents one of the severest contaminants of the aquatic ecosystem owing to its poisonous nature and high concentration, potentially jeopardizing public health and disrupting the nitrogen cycle. Apparently, electrocatalytic NO 2 − reduction can also contribute to the treatment of NO 2 − -contaminated aquatic ecosystems, thus restoring the damage caused by the disturbed nitrogen cycle.…”

Selective Electrocatalytic Oxidation of Nitrogen to Nitric Acid Using Manganese Phthalocyanine

“…This process is extremely energy demanding and produces an extravagant amount of greenhouse gases (CO 2 ) into the atmosphere. , To produce NH 3 in the industrial scale, the Haber–Bosch process is employed, where raw materials (N 2 and H 2 ) are treated at a high temperature (700 K) and pressure (150 atm). This process consumes 1% of the total global energy and produces 1.9 metric ton of greenhouse gas (CO 2 ) per metric ton of NH 3 synthesis. , Current studies on ammonia synthesis (computational study and experimental investigation) may substitute the Haber–Bosch process. − The deletion of the dual step HNO 3 synthesis method forms a mandatory requirement to address the issue and provide an alternate sustainable solution yet catering to the demand of the market . Electrocatalytic dinitrogen oxidation reaction (N 2 OR) using an electrocatalyst under ambient conditions is an optimistically promising alternative to develop a sustainable nitrate product using various heterogeneous catalysts. − Electrocatalytic N 2 oxidation processes follow a two-step pathway.…”

Biofabrication of Titanium Dioxide Nanoparticles Catalyzed by Solanum surattense: Characterization and Evaluation of their Antiepileptic and Cytotoxic Activities

“…They have been detrimental to human and animal health. Using sophisticated metal oxide nanoparticles in a photocatalytic technique, the pharmaceutical medicines are removed from water. , Different methods are used to synthesize TiO 2 NPs, e.g., chemical, physical, and green synthesis methods. − The physical and chemical methods used toxic substances that are hazardous to the environment, as well as high pressure and temperature, and require sufficient space to set up the reaction conditions. Thus, the synthesis of TiO 2 NPs using the biological method has gained more attention because it does not require expensive equipment, high temperatures, and toxic chemicals.…”