摘要
α-Fe_(2)O_(3)是一种最具潜力的光阳极材料,但其电导率差、表面反应速率慢、空穴扩散长度短等限制了其光电化学性能的进一步提高。本文采用在水热过程中加入Zr^(4+)的方法成功制备了Zr原位掺杂的α-Fe_(2)O_(3)光阳极,系统表征研究了Zr改性对α-Fe_(2)O_(3)光阳极光电性能、形貌和晶体结构的影响。研究表明,Zr掺杂α-Fe_(2)O_(3)光阳极光电流密度比纯α-Fe_(2)O_(3)光阳极都有一定的提升,在偏压1.23 V(vs.RHE)下,1.5Zr-Fe光阳极(Zr含量为1.5.%)的光电流密度达到0.95 mA·cm^(-2),是纯α-Fe_(2)O_(3)光阳极光电流密度值的2倍。主要原因是离子半径较大的Zr^(4+)取代了离子半径较小的Fe^(3+)进入氧化铁晶格后,电极材料保持了(110)晶面择优取向生长,同时促进了(104)方向上定向生长,增加了电极体内载流子浓度。
α-Fe_(2)O_(3)is one of the most promising photoanode materials.However,its poor conductivity,slow surface reaction rate,and short hole diffusion length limit the further improvement of its photoelectrochemical performance.In this paper,Zr in-situ doped α-Fe_(2)O_(3)photoanodes are successfully prepared by adding Zr during the hydrothermal process.The effects of Zr modification on the photoelectrochemical performance,morphology and crystal structure of a-Fe_(2)O_(3)photoanodes are systematically characterized and studied.The research shows that the photocurrent density of Zr-doped α-Fe_(2)O_(3)photoanodes is improved to a certain extent compared with that of pure α-Fe_(2)O_(3)photoanodes.Under a bias of 1.23 V(vs.RHE),the photocurrent density of the 1.5Zr-Fe photoanode with a Zr content of 1.5 at.%reaches 0.95 mA·cm^(2),which is twice the photocurrent density value of the pure α-Fe_(2)O_(3)photoanode.The main reason is that after Zr^(4+) with a larger ionic radius replaces Fe^(3+)with a smaller ionic radius and enters the iron oxide lattice,the electrode material maintains the preferential orientation growth of the(110)crystal plane and at the same time promotes the directional growth in the(104)direction,increasing the carrier concentration in the electrode.
作者
李龙珠
田大香
陈智栋
陈玉伟
杨蓉
丁玉婕
LI Long-zhu;TIAN Da-xiang;CHEN Zhi-dong;CHEN Yu-wei;YANG Rong;DING Yu-jie(School of Chemical and Pharmaceutical Engineering,Changzhou Vocational Institute of Engineering,Changzhou 213164,China;School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China)
出处
《化学研究与应用》
北大核心
2025年第9期2676-2683,共8页
Chemical Research and Application
基金
江苏省青蓝工程项目资助。
关键词
氧化铁
光阳极
水热法
Zr改性
hematite
photoanode
hydrothemal method
Zr modification
