Semiconducting properties of ZnO/TiO2 composites by electrochemical measurements and their relationship with photocatalytic activity

Ramírez-Ortega, David; Meléndez, Ángel M.; Acevedo–Peña, Próspero; González, Ignacio; Arroyo, R.

doi:10.1016/j.electacta.2014.06.060

Cited by 104 publications

(61 citation statements)

References 43 publications

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“…9a (iii)). The OCP variation in the dark after illumination indicates the lifetime of the photogenerated electrons, since they must recombine or transfer toward either the solution, substrate, or trap states [40], to recover the values of OCP. A slow decay after illumination can be related to lower recombination rate, higher resistance for back transfer reaction, abundance of trap states, etc.…”

Section: Impact Of Contact Properties On Photoelectrochemical Performmentioning

confidence: 99%

Improving the contact properties of CdS-decorated TiO2 nanotube arrays using an electrochemical/thermal/chemical approach

Carrera-Crespo

Rincón

González

et al. 2016

J Solid State Electrochem

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Decoration of TiO 2 nanotube films (TiO 2 nanotube arrays (TNAs)) with CdS nanoparticles has been pursued for a broad range of applications that goes from solar cells to biological sensors. In most synthesis methods, the scale-up of devices has been challenging due to the poor contact at the chalcogenide/oxide interface. In this work, we validate the electrochemical/thermal/chemical route as a superior strategy to sensitize TNAs with CdS nanoparticles when compared with conventional methods. The process consisted of (i) electrodeposition of cadmium on TNAs to ensure strong bonding between TiO 2 and Cd precursor particles, (ii) air annealing of Cd-decorated TNAs to thermally oxidize cadmium to cadmium oxide, and (iii) total sulfurization of cadmium oxide to obtain CdS in an hexagonal phase matching that of TNAs. X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) analyses indicated the complete transformation of cadmium precursor particles into CdS and a good surface coverage of the internal/ external walls of TNAs. When compared to samples prepared by successive ionic layer adsorption and reaction (SILAR), electrochemical impedance spectroscopy data revealed the improvement of the electrical properties of the TNA matrix due to the sulfurization process and a lower contact resistance at the CdS/TNA interface. These improvements explain the superior photoelectrochemical response of CdS/TNA photoelectrodes obtained by the electrochemical/thermal/ chemical route.

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Section: Impact Of Contact Properties On Photoelectrochemical Performmentioning

confidence: 99%

Improving the contact properties of CdS-decorated TiO2 nanotube arrays using an electrochemical/thermal/chemical approach

Carrera-Crespo

Rincón

González

et al. 2016

J Solid State Electrochem

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“…This reduced effective band gap is lower than those of both pure TiO 2 and ZnO. Moreover, this band gap narrowing and extension of the absorption edge toward higher wavelengths enable visible light driven photocatalytic and photoelectrochemical water splitting which is a hot research topic in recent years [14,[22][23][24]. In order to investigate the impact of ZnO interfacial layer in the device PV performance, current-voltage (J-V) characteristics of different cells are measured by a Keithley 2440 source meter (AM1.5 G, 100 mW/cm 2 ).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Performance of Nanowire-Based All-TiO2 Solar Cells using Subnanometer-Thick Atomic Layer Deposited ZnO Embedded Layer

Ghobadi

Yavuz

Ghobadi

et al. 2015

Electrochimica Acta

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In this paper, the effect of angstrom-thick atomic layer deposited (ALD) ZnO embedded layer on photovoltaic (PV) performance of Nanowire-Based All-TiO 2 solar cells has been systematically investigated. Our results indicate that by varying the thickness of ZnO layer the efficiency of the solar cell can be significantly changed. It is shown that the efficiency has its maximum for optimal thickness of 1 ALD cycle in which this ultrathin ZnO layer improves device performance through passivation of surface traps without hampering injection efficiency of photogenerated electrons. The mechanisms contributing to this unprecedented change in PV performance of the cell have been scrutinized and discussed.

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“…A significant redox current peaks of FeII/FeIII was observed using nano ZnO-TiO 2 -GP modified GCE by K 4 [Fe(CN) 6 ] solution in normal saline as supporting electrolyte. The results also reveal that the new modified electrode with nanoparticles has good sensitivity and enhanced the oxidation current peak of FeII/FeIII in acidic pH and inhibited of alkaline medium.…”

Section: Discussionmentioning

confidence: 99%

“…Enhancement in photocatalytic activity was obtained using nano ZnO/TiO 2 in an electrochemical study [6]. CV analysis was studied for the degradation of methylene blue on photo-catalysts using ZnO/ TiO 2 nanoparticles in the average dimension of 30-100 nm.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticles of TiO2-ZnO Modified Polystyrene-Acrylonitrile Characterization Using Glassy Carbon Electrode

Al-Mulla¹

2018

Nano BioMed ENG

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Grafted polystyrene with acrylonitrile modified nanoparticles of TiO 2 -ZnO was successfully prepared to study its electrochemical characterization by cyclic voltammetric (CV) method. It was found the new modified copolymer had good electrochemical properties and was a semi-conductor material. The ratio redox current peak (Ipa/Ipc) was equal to 2; the separation potential peak (Epa-Epc) was equal to 113 mV. Normal saline was used as a good electrolyte to enhance the solution of peaks of redox current for K 4 Fe(CN) 6 . Different concentrations, scan rates, and pH values were studied of the modified glassy carbon electrode (GCE). Diffusion coefficient values of the ions were determined using Randles-Sevcik equation. Scanning electron microscope (SEM) and atomic force microscope (AFM) images for the new grafted polymer modified nanoparticles were studied. The product could be used in various industrial applications due to its electrochemical properties.

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Semiconducting properties of ZnO/TiO2 composites by electrochemical measurements and their relationship with photocatalytic activity

Cited by 104 publications

References 43 publications

Improving the contact properties of CdS-decorated TiO2 nanotube arrays using an electrochemical/thermal/chemical approach

Improving the contact properties of CdS-decorated TiO2 nanotube arrays using an electrochemical/thermal/chemical approach

Enhanced Performance of Nanowire-Based All-TiO2 Solar Cells using Subnanometer-Thick Atomic Layer Deposited ZnO Embedded Layer

Nanoparticles of TiO2-ZnO Modified Polystyrene-Acrylonitrile Characterization Using Glassy Carbon Electrode

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