XPS studies and photocurrent applications of alkali-metals-doped ZnO nanoparticles under visible illumination conditions

Saáedi, Abdolhossein; Yousefi, Ramin; Jamali‐Sheini, Farid; Zak, A. Khorsand; Cheraghizade, Mohsen; Mahmoudian, M.R.; Baghchesara, Mohammad Amin; Dezaki, Abbas Shirmardi

doi:10.1016/j.physe.2015.12.002

Cited by 105 publications

(31 citation statements)

References 29 publications

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“…It indicates that this oxygen is in an environment of lower electron cloud (O x− ) around it ( x < 2). This O1s signal (P2) has been assigned to the oxygen vacancies generated by the incorporation of foreign cations into the lattice of ZnO . In fact, as can be seen in Figure c, the intensity of the O1s (P2) increases as the Eu concentration went from 0 to 4%.…”

Section: Resultsmentioning

confidence: 99%

Effect of Eu Doping on the Physical, Photoluminescence, and Photocatalytic Characteristics of ZnO Thin Films Grown by Sol–Gel Method

Rayes

Kumar

Cortés-Jácome

et al. 2017

Physica Status Solidi (a)

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Eu doping concentration driven effect on the morphological, electrical, and optical properties of ZnO films prepared by sol gel method have been studied systematically. The properties of the films were studied using various experimental tools such as XRD, AFM, XPS, photoconductivity, UV–vis spectroscopy, photoluminescence (PL), and photocatalytic activity. Eu incorporation into the ZnO lattice was confirmed by XPS analysis. A decrease in crystallite size with increasing Eu concentration was observed. PL spectra showed that Eu‐ related light emission intensity reached a maximum at 6 wt.%. Photoconductivity measurements showed maximum photosensitivity for 4 wt.% Eu doped film. The photocatalytic activity of Eu‐ doped films was evaluated for methylene blue degradation and is found to be maximum for 6 wt.% Eu doped film.

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Section: Resultsmentioning

confidence: 99%

Effect of Eu Doping on the Physical, Photoluminescence, and Photocatalytic Characteristics of ZnO Thin Films Grown by Sol–Gel Method

Rayes

Kumar

Cortés-Jácome

et al. 2017

Physica Status Solidi (a)

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“…The photoemission peak located at around 1068.8 eV for Na 1s shows the doping of Na impurities in the atomic structure of ZnO. Therefore, the XPS results confirm that the Na element substituting for Zn [25]. The low binding energy component centered at 529.5 eV may be attributed to the oxygen atoms position of Na 2 O.…”

Section: Fig 1 Xrd Patterns Of the Zno Filmsmentioning

confidence: 56%

Synthesis and Characterization of Na Doped ZnO Rods Grown by Simple Chemical Method

Karadeniz

Çiplak²,

Ekinci³

2020

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In this study, the effects of Na doped on the structure, morphology, and optical properties of the ZnO films deposited on glass substrate were investigated. The films were synthesized on glass substrates via a simple chemical method. Undoped and Na-doped ZnO films were obtained from an aqueous solution of the Zinc nitrate hexahydrate (Zn(NO3)2·6H2O), Sodium Nitrate (NaNO3) and hexamethylenetetramine-HMT (C6H12N4). Characterization of the films was examined using a Scanning electron microscope (SEM) and X-ray diffractometer (XRD), Ultraviolet-Visible spectrophotometer (UV-Vis) and X-Ray Photoelectron (XPS). The structure, morphology, and optical properties of the films were presented. The wurtzite ZnO films showed rod arrays morphology. The optical band gap increased with the doping of Na metal. The result shows that Na addition affected the properties of the ZnO films.

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“…So the 533.79 eV peak does not represent the O of the organic framework of Nafion ® . The Yusefi Group (Saáedi et al, 2016) in their study for alkali-metal-doped ZnO assigned the O-vacancy peak at 533.25 eV. Xie et al (Lei et al, 2014) in their work on In 2 O 3 clearly showed the O-vacancy peaks to be at 531.5 eV.…”

Section: Resultsmentioning

confidence: 97%

X-ray photoelectron spectroscopy study of the degradation of Pt/ITO electrocatalyst in an operating polymer electrolyte fuel cell

Wang

Bhattacharyya

Parrondo

et al. 2016

Chemical Engineering Science

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We investigate the performance and stability of a platinum (Pt) supported on indium tin oxide (ITO) electrocatalyst. ITO was synthesized using the co-precipitation method and uniform particles with a B.E.T. surface area larger than 40 m 2 /g were obtained. Pt was dispersed onto the ITO by colloidal deposition followed by reduction with formaldehyde. Previous rotating disk electrode (RDE) work has shown that Pt/ITO possesses high activity and stability for the oxygen reduction reaction (ORR). However, this catalyst exhibited very poor performance and stability in an operating polymer electrolyte fuel cell (PEFC) membrane electrode assembly (MEA). For H 2 /O 2 PEFC operation at 80 ºC and 75% relative humidity (RH), the current density obtained at 0.55V was only 90 mA/cm 2 , and the maximum current density was only 150-160 mA/cm 2 , when Pt/ITO was used at the cathode, whereas a limiting current density of 3900 mA/cm 2 was readily obtained using a benchmark Pt/C catalyst under identical conditions. The low performance with Pt/ITO was primarily due to the high overall cell resistance of the MEA (> 400 mOhm-cm 2). X-ray photoelectron spectroscopy (XPS) was employed to investigate the degradation of the Pt/ITO catalyst in the PEFC electrode during operation. The deconvolution of the indium 3d XPS peak revealed the presence of two peaks: the first was assigned to indium oxide in ITO (at 445.6eV), while the second was assigned to indium hydroxide (at 446.6 eV). We observed an increase in surface hydroxide concentration (compared to pristine Pt/ITO) after the Pt/ITO catalyst was used either at the cathode or anode of an operating PEFC. We postulate that the surface hydroxides form a passivating layer that increases the electrode resistance and undermines PEFC performance.

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XPS studies and photocurrent applications of alkali-metals-doped ZnO nanoparticles under visible illumination conditions

Cited by 105 publications

References 29 publications

Effect of Eu Doping on the Physical, Photoluminescence, and Photocatalytic Characteristics of ZnO Thin Films Grown by Sol–Gel Method

Effect of Eu Doping on the Physical, Photoluminescence, and Photocatalytic Characteristics of ZnO Thin Films Grown by Sol–Gel Method

Synthesis and Characterization of Na Doped ZnO Rods Grown by Simple Chemical Method

X-ray photoelectron spectroscopy study of the degradation of Pt/ITO electrocatalyst in an operating polymer electrolyte fuel cell

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