CoS_(2)/TCN肖特基结的构筑及其光催化还原CO_(2)性能  

Construction of CoS_(2)/TCN Schottky junction andits photocatalytic reduction of CO_(2)

作　　者：何玲珑 曾祥会 刘勇政 赵雷[1] 方伟[1] 何漩[1] 杜星[1] 李薇馨 王大珩 陈辉[1] HE Linglong;ZENG Xianghui;LIU Yongzheng;ZHAO Lei;FANG Wei;HE Xuan;DU Xing;LI Weixin;WANG Daheng;CHEN Hui(The State Key Laboratory of Refractories and Metallurgy,Wuhan University ofScience&Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《功能材料》2023年第10期10117-10124,共8页Journal of Functional Materials

基　　金：国家级大学生创新训练项目(202110488001);国家自然科学基金(22105151,51802234);湖北省自然科学基金(2021CFB469,2021CFB124);武汉市知识创新专项(2022010801010306)。

摘　　要：以三聚氰胺为主要原料,通过水热结合热聚合的方法制备了g-C_(3)N_(4)微米管(TCN),并以TCN作为基体材料,将二硫化钴负载在TCN管状表面构筑CoS_(2)/TCN肖特基结。通过XRD、SEM、TEM、FLS以及光电化学工作站对所得样品进行了表征,并在无牺牲剂条件下,采用光催化活性评价系统考察了CoS_(2)/TCN肖特基结的光催化还原CO_(2)性能。结果表明,CoS_(2)在TCN管状表面均匀分布,CoS_(2)的引入增强了TCN对可见光的利用。由于CoS_(2)费米能级电位低于TCN的费米能级电位,在基态下异质结界面附近电子由TCN向CoS_(2)发生转移,使界面处费米能级达到平衡。此外,异质界面处的空间电势差有利于CoS_(2)通过肖特基结快速提取TCN产生的光生电子,促进光生电荷分离。在350~780 nm光照下,试样2CSTCN的CO产率达到16.04μmol/(g·h),与Pt/TCN产率(16.70μmol/(g·h))相近,是TCN的5.14倍。g-C_(3)N_(4)microtubes(TCN)were prepared by hydrothermal combined with thermal polymerization using melamine as the main raw material.And then CoS_(2)/TCN Schottky junctions were constructed by loading cobalt sulfide on the tubular surface of prepared TCN.The obtained samples were characterized by XRD,SEM,TEM,FLS and photoelectrochemical workstation,and their photocatalytic activity was investigated by photocatalytic activity evaluation system in absence of sacrificial agent.The results show that CoS_(2)is uniformly distributed on the tubular surface of TCN,and the loading of CoS_(2)enhances the utilization of visible light by TCN.As the Fermi level potential of CoS_(2)is lower than that of TCN,the electrons near the heterojunction interface transfer from TCN to CoS_(2)in the ground state,resulting in equilibrium of the Fermi level at the interface.Taking advantage of the spatial potential difference at the heterojunction interface,the photogenerated electrons from TCN can be quickly extracted by CoS_(2)through Schottky junction,so as to promote the separation of photogenerated electrons and holes.Under the illumination of 350-780 nm,the CO yield of the optimal performance sample reached 16.04μmol/(g·h),similar to that of Pt/TCN(16.70μmol/(g·h)),and 5.14 times of TCN.

关 键 词：光催化还原CO_(2) 肖特基异质结 二硫化钴 g-C_(3)N_(4)微管 

分 类 号：TQ128[化学工程—无机化工]