摘要
通过逐步合成法制备了具有储存电子和物理阻隔功能的CeO2/CdS纳米复合材料,并用于光电阴极保护。通过XRD,TEM,UV-Vis和PL等手段对制备的纳米复合材料进行表征。在模拟白光照射下研究不同质量比的CeO2/CdS复合材料的光电化学性质。在黑暗条件下,涂有CeO2/CdS(质量比0.2:1.0)的304不锈钢涂层的电位比CeO2/CdS(质量比0.2:1.0)粒子涂层更正。在白光照射下,CeO2/CdS(质量比0.2:1.0)复合材料的最大光电流密度为700μA·cm–2,涂有CeO2/CdS(质量比0.2:1.0)的304不锈钢涂层的电位为–650 mV(vs.SCE),明显低于304不锈钢腐蚀电位(–200 mV vs.SCE),表明片状CdS具有物理阻隔性能及CeO2/CdS复合材料具有显著的光电化学性能。这主要是由于CeO2纳米颗粒和CdS纳米片之间形成了异质结,促进了光致电子和空穴的有效分离,从而提高了光电转换效率。此外,由于CeO2具有储存电子的功能,在黑暗条件下可以继续释放电子,能够提供12 h的阴极保护性能。
CeO2/CdS nanocomposites with the function of storing electrons and physical barrier were fabricated for photocathodic protection through a stepwise synthetic route.The obtained smples were characterized by XRD,TEM,UV-Vis and PL.The photoelectrochemical properties of CeO2/CdS with different mass ratios were investigated under white light irradiation.The maximum photocurrent density of CeO2/Cd S(mass ratio 0.2:1.0)is 700μA·cm-2 and the potential of the 304 stainless steel coated with CeO2/Cd S(mass ratio 0.2:1.0)shifts to–650 mV(vs.SCE),which is significantly lower than the corrosion potential(–200 mV vs.SCE).The above results indicate that the CeO2/CdS composites exhibit remarkable photo cathodic properties which are attributed to the heterostructure of CeO2 nanoparticles and CdS nanosheets,and the structure facilitates the separation of photo-induced electron and hole.Furthermore,the CeO2/CdS composites can also provide cathodic protection for 12 h in the dark.
作者
魏科年
刘展
左士祥
严向玉
吴凤芹
李霞章
姚超
刘孝恒
WEI Ke-Nian;LIU Zhan;ZUO Shi-Xiang;YAN Xiang-Yu;WU Feng-Qin;LI Xia-Zhang;YAO Chao;LIU Xiao-Heng(Key Laboratory for Soft Chemistry and Functional Materials,Ministry of Education,Nanjing University of Science and Technology,Nanjing 210094,China;Advanced Catalysis and Green Manufacturing Collaborative Innovation Center,School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第12期1334-1340,共7页
Journal of Inorganic Materials
基金
Fundamental Research Funds for the Central Universities(30916014103)
Key R&D Programs of Jiangsu Province(BE2018649)
Innovation Team of Six Talent Peaks of Jiangsu Province(XCL-CXTD-029)
Key R&D Programs of Changzhou City(CE20185007)
