草酸和Ti(OBu)_(4)协同增强α-Fe_(2)O_(3)光阳极光电化学性能研究  

Oxalic acid and Ti(OBu)_(4)synergistic enhancement of photoelectrochemical response of hematite photoanode for water splitting

作　　者：李龙珠[1,2] 田大香[3] 陈智栋 陈玉伟 杨蓉[1] 丁玉婕[1] LI Long-zhu;TIAN Da-xiang;CHEN Zhi-dong;CHEN Yu-wei;YANG Rong;DING Yu-je(School of Chemical and Pharmaceutical Engineering,Changzhou Vocational Institute of Engineering,Changzhou 213164,China;Jiangsu Province Engineering Research Center of Intelligent Manufacturing Technology for the New Energy Vehicle Power Battery,Changzhou University,Changzhou 213164,China;School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州工程职业技术学院化工与制药工程学院,江苏常州213164 [2]常州大学江苏省新能源汽车动力电池智能制造技术工程研究中心,江苏常州213164 [3]常州大学材料科学与工程学院,江苏常州2131642

出　　处：《化学研究与应用》2024年第11期2615-2623,共9页Chemical Research and Application

基　　金：江苏省高职院校教师专业带头人高端研修项目(2023GRFX003)资助;国家自然科学基金项目(22178031、22378029)资助;江苏省青蓝工程项目资助

摘　　要：α-Fe_(2)O_(3),光阳极材料具有电导率差,表面反应速率慢,空穴扩散长度短等缺点,导致了光生载流子的快速复合,导致其光电化学性能较差。本文创新性地提出通过草酸无表面活性剂自腐蚀技术对电沉积Fe膜进行改性,获得草酸修饰α-Fe_(2)O_(3),光阳极(Fe_(2)O_(3)-H_(2)C_(2)O_(4)),具有纳米结构形貌,使其表面电荷注入效率(η_(surface))得到提高。然后联合Ti(OBu)_(4)协同改性获得草酸与Ti(OBu)_(4)共改性α-Fe_(2)O_(3)光阳极(Fe_(2)O_(3)-H_(2)C_(2)O_(4)+TBT),在1.23V时其光电流密度增加一倍达到0.59mA·cm^(-2),在1.5V时光电流密度增加两倍至1.5mA·cm^(-2)。Fe_(2)O_(3),-H_(2)C_(2)O_(4)+TBT样品性能提升的主要原因是其表面积和表面态的增加提高了表面电荷注入效率。同时,本文通过系统表征研究了草酸和Ti(OBu)_(4)对α-Fe_(2)O_(3)光阳极光电性能、形貌和晶体结构的影响。Since theα-Fe_(2)O_(3)photoanode material has poor conductivity,slow surface reaction rate and small hole diffusion length,its photoelectrochemical performance is limited.In this paper,Oxalic acid modifiedα-Fe,O3 photoanodes(Fe_(2)O_(3)-H_(2)C_(2)O_(4))are prepared by the surfactant-free self-corrosion process of oxalic acid on electrodeposited Fe film,and its surface charge injection efficiency(nsurtee)is improved,mainly due to the change in morphology.Through the synergistic action of Ti(OBu)_(4),the photocurent density of oxalic acid and Ti(OBu)_(4)co-modifiedα-Fe_(2)O_(3)photoanode(Fe_(2)O_(3)-H_(2)C_(2)O_(4)+TBT)is doubled to 0.59 mA·cm^(2)at 1.23 V vs.RHE,and tripled to 1.5 mA·cm-2 at 1.5 V vs.RHE.The performance improvement of the Fe_(2)O_(3)-H,C,O+TBT sample is mainly attributed to the increase of surface area and surface state,which leads to the improvement of surface charge injection efficiency.In this paper,the effects of oxalic acid and Ti(OBu)_(4)on photoelectric properties,morphology and crystal structure of hematite photoanodes are investigated through system characterization.

关 键 词：氧化铁 光阳极 阴极电沉积 草酸和Ti(OBu)4共改性 

分 类 号：O614.4[理学—无机化学]