H_(2)O_(2) treatment boosts activity of NiFe layered double hydroxide for electro-catalytic oxidation of urea  

作　　者：Jinshan Wei Jin Wang Xiaoming Sun 

机构地区：[1]College of Materials Science and Engineering,Key Laboratory of Optoelectronic Devices and Systems,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China [2]State Key Laboratory of Chemical Resource Engineering,College of Chemistry,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Journal of Environmental Sciences》2023年第7期152-160,共9页环境科学学报（英文版）

基　　金：This work was supported by the National Key R&D Program of China(No.2021YFA1600800);the Funds fromConstruction of High Level Universities and Key Disciplines of Shenzhen University(No.860-000002110291).

摘　　要：Urea oxidation reaction(UOR)provides a method for hydrogen production besides wastewater treatment,but the current limited catalytic activity has prevented the application.Herein,we develop a novel H_(2)O_(2) treatment strategy for tailoring the surface oxygen ligand of NiFe-layered double hydroxides(NiFe-LDH).The sample after H_(2)O_(2) treatment(NiFeOLDH)shows significant enhancement on UOR efficiency,with the potential of 1.37 V(RHE)to reach a current density of 10 mA/cm^(2).The boost is attributed to the richness adsorption O ligand on NiFeO-LDH as revealed by XPS and Raman analysis.DFT calculation indicates formation of two possible types of oxygen ligands:adsorbed oxygen on the surface and exposed from hydroxyl group,lowered the desorption energy of CO_(2) product,which lead to the lowered onset potential.This strategy is further extended to NiFe-LDH nano sheet on Ni foam to reach a higher current density of 440 mA/cm^(2) of UOR at 1.8 V(RHE).The facile surface O ligand manipulation is also expected to give chance to many other electro-catalytic oxidations.

关 键 词：NiFe-LDH Urea oxidation reaction H_(2)O_(2)treatment ELECTRO-CATALYSIS Hydrogen production 

分 类 号：X703[环境科学与工程—环境工程]