钴、碳共掺杂氮化碳的制备及其光催化分解水产氢性能  

Cobalt and Carbon Co-doped Carbon Nitride for Enhanced Photocatalytic Hydrogen Evolution

作　　者：郑富凯 李宗霖 曹煜祺 张慧 曹鑫 孙建华 ZHENG Fu-Kai;LI Zong-Lin;CAO Yu-Qi;ZHANG Hui;CAO Xin;SUN Jian-Hua(School of Chemistry and Environmental Engineering,Institute of Advanced Functional Materials for Energy,Jiangsu University of Technology,Changzhou,Jiangsu 213001,China)

机构地区：[1]江苏理工学院化学与环境工程学院,先进能源功能材料研究所,常州213001

出　　处：《无机化学学报》2021年第11期2029-2036,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.51702134);江苏省自然科学基金(No.BK20170310);江苏理工学院研究生实践创新计划(No.XSJCX21_75)资助。

摘　　要：针对氮化碳可见光利用率低和在光催化过程中光生电子与空穴易于复合的缺点,通过钴、碳共掺杂提升其光催化性能。以尿素为前驱体,维生素B12(VB12)为钴源和碳源,将二者的混合物进行一步煅烧,制备钴、碳共掺杂氮化碳(CNCoC)。结果表明,钴、碳共掺杂对氮化碳的微观形貌、骨架结构和官能团都没有造成明显影响;但是增大了产物的比表面积,调节了产物的能带结构,增加了其对可见光的吸收。更重要的是,相比于单一元素碳的掺杂,钴、碳共掺杂具有协同作用,能够更有效地提升光生电子和空穴的分离和传递效率。因此,加入6 mg VB12制备的CNCoC-6的可见光光催化分解水产氢速率达到了56.1μmol·h^(-1),是纯氮化碳(CN)的3.05倍;而碳掺杂氮化碳(CNC-6)的产氢速率仅为CN的2.55倍。The photocatalytic activity of carbon nitride is greatly limited by the low visible-light utilization and fast photocarries recombination.Here,a new cobalt and carbon co-doped carbon nitride(CNCoC) was prepared via a one-step thermal condensation method using vitamin B12(VB12) as the cobalt and carbon source mixed with urea.The characterization results indicate that the cobalt and carbon co-doping does not change the morphology,skeleton stmcture or functional groups of carbon nitride.However,the co-doping contributes to the enhanced surface area,optimized band stmcture and increased visible-light absorption.More importantly,compared to carbon doping,the synergistic effect of cobalt and carbon co-doping leads to more efficient photocarrier separation and transport.As a result,the photocatalytic hydrogen evolution rate of CNCoC-6 prepared with 6 mg VB12 reached 56.1 μmol·h;under visible light irradiation,which was 3.05 times that of pure carbon nitride(CN).While the carbon doped carbon nitride(CNC-6) only exhibited a hydrogen evolution rate to be 2.55 times that of CN.

关 键 词：氮化碳 光催化 共掺杂 分解水 产氢 

分 类 号：O614.812[理学—无机化学] TB333[理学—化学]