三维ZnO/CdS光电极的制备及其光电化学性能研究
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摘要
采用两步水热法,在FTO基底上制备了ZnO/CdS阵列薄膜。利用扫描电镜(SEM)和透射电镜(TEM)对样品的形貌和结构进行了表征,发现通过改变水热前驱体溶液中的表面活性剂,可以有效改变ZnO/CdS光电极的形貌。制备了一维和三维结构的ZnO/CdS薄膜,以制备的薄膜作为光电极,研究了其光电化学性能,发现三维ZnO/CdS电极具有更高的光电流密度和能量转化效率,分析了电极光电化学性能提升的内在机制。
Two-step hydrothermal method was developed to synthesize ZnO/CdS heterojunction film on FTO substrate.The scanning electron microscope(SEM)and transmission electron microscope(TEM)were used to characterize its morphology and structure.It is found that the morphology of ZnO/CdS nanorods will change by changing the surfactant of precursor solution,then one dimensional or three dimensional ZnO/CdS films were obtained.Then by using the films as photoelectrocdes,their photoelectrochemical properties were investigated.It is found that three dimensional ZnO/CdS photoelectrodes own higher photocurrent density and energy exchange efficiency.The internal mechanism for improving the photoelectrochemical properties was also discussed.
Two-step hydrothermal method was developed to synthesize ZnO/CdS heterojunction film on FTO substrate.The scanning electron microscope(SEM)and transmission electron microscope(TEM)were used to characterize its morphology and structure.It is found that the morphology of ZnO/CdS nanorods will change by changing the surfactant of precursor solution,then one dimensional or three dimensional ZnO/CdS films were obtained.Then by using the films as photoelectrocdes,their photoelectrochemical properties were investigated.It is found that three dimensional ZnO/CdS photoelectrodes own higher photocurrent density and energy exchange efficiency.The internal mechanism for improving the photoelectrochemical properties was also discussed.
引文
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[4]Wang M,Ren F,Zhou J,et al.N doping to ZnO nanorods for photoelectrochemical water splitting under visible light:Engineered impurity distribution and terraced band structure[J].Sci.Rep.,2015(5):12925.
[5]Bu Y,Chen Z,Li W,et al.High-efficiency photoelectrochemical properties by a highly crystalline CdS-sensitized ZnO nanorod array[J].ACS Appl.Mater.Inter.,2013,5(11):5097-5104.
[6]Apte S K,Garaje S N,Valant M,et al.Eco-friendly solar light driven hydrogen production from copious waste H2S and organic dye degradation by stable and efficient orthorhombic CdS quantum dots-GeO2 glass photocatalyst[J].Green Chem.,2012,14(5):1455-1462.
[7]Qi X,She G,Liu Y,et al.Electrochemical synthesis of CdS/ZnO nanotube arrays with excellent photoelectrochemical properties[J].Chem.Commun.,2012,48(2):242-244.
[8]Guo C X,Xie J,Yang H,et al.Au@CdS core-shell nanoparticles-modified ZnO nanowires photoanode for efficient photoelectrochemical water splitting[J].Adv.Sci.,2016,2(12):2084-2088.
[9]Shen Q,Zhao X,Zhou S,et al.ZnO/CdS hierarchical nanospheres for photoelectrochemical sensing of Cu2+[J].J.Phys.Chem.C,2011,115(36):17958-17964.
[10]Anthony S P,Lee J I,Kim J K.Tuning optical band gap of vertically aligned ZnO nanowire arrays grown by homoepitaxial electrodeposition[J].Appl.Phys.Lett.,2007,90(10):103103-103107.
[11]Cho I S,Chen Z,Forman A J,et al.Branched TiO2nanorods for photoelectrochemical hydrogen production[J].Nano.Lett.,2011,11(11):4978-4984.
[12]Chen W,Qiu Y,Yang S.Branched ZnO nanostructures as building blocks of photoelectrodes for efficient solar energy conversion[J].Phys.Chem.,2012,14(31):10872-10881.
[13]Yang C,Li M,Zhang W H,et al.Controlled growth,properties,and application of CdS branched nanorod arrays on transparent conducting oxide substrate[J].Sol.Energ.Mat.and Sol.C.,2013,115(8):100-107.
[14]Chen Z,Jaramillo T F,Deutsch T G,et al.Accelerating materials development for photoelectrochemical hydrogen production:Standards for methods,definitions,and reporting protocols[J].J.Mater.Res.,2011,25(1):3-16.
[15]Wang X,Liu G,Chen Z G,et al.Enhanced photocatalytic hydrogen evolution by prolonging the lifetime of carriers in ZnO/CdS heterostructures[J].Chem.Commun.,2009,23(23):3452-3454.
[16]Peng Q,Kalanyan B,Hoertz P G,et al.Solutionprocessed,antimony-doped tin oxide colloid films enable high-performance TiO2 photoanodes for water splitting[J].Nano.Lett.,2013,13(4):1481-1488.