▎ 摘　　要

NOVELTY - Preparing copper-based catalyst for the electrocatalytic reduction of nitrate to ammonia, comprises (i) placing cut carbon cloth in a round-bottom flask containing concentrated nitric acid, placing flask in an oil bath and boiling, rinsing with water and soaking in distilled water, (ii) dissolving copper(II) sulfate pentahydrate, silver nitrate, sodium hydroxide in a mixed solvent of ethanol and water, and stirring, (iii) using a three-electrode system for electrodeposition on a CHI 660E electrochemical workstation, (iv) place the electro deposited carbon cloth in a ceramic boat, placing in the center of a tube furnace, and introducing argon gas at a flow rate of 190-210 ml/minutes, venting, heating up to 550 °C at a rate of 5 °C/minute and sintering for 2 hours, cooling to room temperature, the CuxO/Ag-CC heterojunction electrode material supported on carbon cloth is obtained, denoted as CuxO/Ag-CC. USE - The method is useful for preparing copper-based catalyst for electro-catalytic reduction of nitrate radical as ammonia, which is useful as fertilizer and precursor of various chemicals, fuel and energy carrier. ADVANTAGE - The copper-based catalyst has excellent NO3RR catalytic activity and NH3-N selectivity. The metal silver is a good conductor of the electricity, the introduction of the silver can improve the conductivity of the catalyst, and carbonaceous material such as reduction graphene (rGO). The use of carbon cloth and carbon nano sheet not only can provide support for metal-based nano structure, but also can enhance conductivity and prevent the agglomeration, based on the characteristics material. The catalyst provides a high catalyst activity, ammonia yield, high Faraday efficiency, high ammonia selectivity and high conversion rate of electro-catalytic reduction of nitrate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a copper-based catalyst for electrocatalytic reduction of nitrate radical as ammonia.