Boosting electrochemical oxidation of As(Ⅲ)on Fe-doped RuO_(2)/PEDOT/SnO_(2) nanocomposite anode:Fabrication,performance and mechanism

作     者：Xinyu Miao Jiao Shen Wenlan Ji Tian CZhang Ying Liang Shaojun Yuan Xinyu Miao;Jiao Shen;Wenlan Ji;Tian C.Zhang;Ying Liang;Shaojun Yuan

作者机构：Low-carbon Technology&Chemical Reaction Engineering LabCollege of Chemical EngineeringSichuan UniversityChengdu 610065China College of Architecture and Environmental EngineeringSichuan UniversityChengdu 610065China Civil&Environmental Engineering DepartmentUniversity of Nebraska-LincolnOmahaNE 68182-0178United States of America 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2024年第180卷第13期

页      面：243-258页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：National Natural Science Foundation of China(No.21978182) 

主　　题：Arsenite Electrocatalytic oxidation Iron-doped ruthenium oxide Anode Reactive oxygen species 

摘      要：Design of electrode materials for stable and efficient electrocatalytic oxidation of As(Ⅲ)in arsenic-contaminated groundwater poses a great challenge due to the rapid deactivation of catalysts resulting from the high oxygen evolution potential(OEP)and considerable barrier to generating reactive oxygen species(ROS).Herein,an innovative TNAs/SnO_(2)/PEDOT/Fe(Ⅲ)-RuO_(2) multilayer electrode was synthesized by utilizing a PEDOT-coated SnO_(2) interlayer as a supportive framework to combine Fe-doped amorphous RuO_(2) catalytic layer with TiO_(2) nanotube array *** electrode exhibited high activity and sta-bility for the oxidation of As(Ⅲ)to As(V)due to the large surface area provided by the TiO_(2) nanotube arrays and the SnO_(2)/PEDOT interlayer for facilitating the growth of the catalytic *** electrochem-ically active surface area of the electrode reached as high as 31.7 mF/cm^(2).Impressively,the doping of Fe into RuO_(2) layer led to a remarkable increase in the OEP value to 3.12 V,which boosted the indirect oxidation process mediated by ROS at a lower potential to achieve the As(Ⅲ)oxidation ratio of 98.5%.DFT calculations revealed that the Fe-doped amorphous RuO_(2) weakened the adsorption strength of·OH ***4-intermediates and lowered the energy barrier for generating *** with ESR results,the formation of·OH and·SC4-with strong oxidizing properties was fully verified,providing further evi-dence for the involvement of ROS as the main mediator of the oxidation mechanism of As(Ⅲ).This work may provide valuable perspectives into the design of catalytic layer structures and heteroatom doping modifications for composite-coated electrodes.