On the determination of the flat-band potential of a semiconductor in contact with a metal or an electrolyte from the Mott-Schottky plot

Cardon, F.; Gomes, W. P.

doi:10.1088/0022-3727/11/4/003

Cited by 374 publications

(267 citation statements)

References 12 publications

Supporting

Mentioning

253

Contrasting

Unclassified

Order By: Relevance

“…In order to further investigate the role of WS 2 , the flat band potentials of the TiSi 2 and WS 2 -1/TiSi 2 -723 electrodes were measured respectively. The flat band potential (E fb ) was determined by the onset potential of the Mott-Schottky (M-S) plots [37]. As demonstrated in Figure 5B, both TiSi 2 and WS 2 -1/TiSi 2 -723 electrodes exhibit a positive slope, indicating an n-type semiconductor feature [38].…”

Section: Optical and Photoelectrochemical Propertiesmentioning

confidence: 99%

WS2 as an Effective Noble-Metal Free Cocatalyst Modified TiSi2 for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

et al. 2016

View full text Add to dashboard Cite

Abstract:A noble-metal free photocatalyst consisting of WS 2 and TiSi 2 being used for hydrogen evolution under visible light irradiation, has been successfully prepared by in-situ formation of WS 2 on the surface of TiSi 2 in a thermal reaction. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results demonstrate that WS 2 moiety has been successfully deposited on the surface of TiSi 2 and some kind of chemical bonds, such as Ti-S-W and Si-S-W, might have formed on the interface of the TiSi 2 and WS 2 components. Optical and photoelectrochemical investigations reveal that WS 2 /TiSi 2 composite possesses lower hydrogen evolution potential and enhanced photogenerated charge separation and transfer efficiency. Under 6 h of visible light (λ > 420 nm) irradiation, the total amount of hydrogen evolved from the optimal WS 2 /TiSi 2 catalyst is 596.4 µmol·g −1 , which is around 1.5 times higher than that of pure TiSi 2 under the same reaction conditions. This study shows a paradigm of developing the effective, scalable and inexpensive system for photocatalytic hydrogen generation.

show abstract

Section: Optical and Photoelectrochemical Propertiesmentioning

confidence: 99%

WS2 as an Effective Noble-Metal Free Cocatalyst Modified TiSi2 for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Figure 6 shows the plots of 1/C 2 against the applied potential V (i.e., Mott Schottky plots) obtained at two frequencies (3000 and 5000 Hz). The MottSchottky equation is given by 42) 1…”

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic performance of Au nanoparticles-modified rose flower-like Bi<sub>2</sub>WO<sub>6</sub> hierarchical architectures

Zheng

Yang

Cui

2017

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

Rose flower-like Bi 2 WO 6 hierarchical architectures with average diameter of 7¯m were synthesized via a hydrothermal route. The as-synthesized Bi 2 WO 6 hierarchical architectures were decorated with Au nanoparticles (20110 nm in size) by a photocatalytic reduction method. The prepared samples were systematically investigated by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, ultravioletvisible diffuse reflectance spectroscopy, electrochemical impedance spectroscopy and photocurrent response. The photocatalytic performance of the samples was evaluated by the degradation of RhB in aqueous solution under simulated sunlight irradiation. It is observed that AuBi 2 WO 6 composite exhibits a photocatalytic activity much higher (about 2.7 times higher) than that of bare Bi 2 WO 6 . The enhanced photocatalytic activity of AuBi 2 WO 6 can be attributed to the enhanced separation of photogenerated electronhole pairs due to the electron migration from Bi 2 WO 6 hierarchical architectures to Au nanoparticles. As a result, more electrons and holes are able to participate in the photocatalytic reactions. The underlying photocatalytic mechanism was discussed.

show abstract

“…7 For pure anatase TiO 2 (the free charge carrier density is smaller than 10 19 cm -3 ), the ideal Mott-Schottky equation obtained by applying Boltzmann statistics is written as:…”

Section: Resultsmentioning

confidence: 99%

“…Further in this regime the application of Mott-Schottky equation might not be valid any more. 7 To address this issue, it was proposed that epitaxial film rather than polycrystalline porous film should be used. 8 In the present work, we have used the model system of pulsed laser deposited Ta incorporated anatase TiO 2 epitaxial thin films to examine the shift of band positions as a function of Ta concentration.…”

Section: Introductionmentioning

confidence: 99%

Scaling of flat band potential and dielectric constant as a function of Ta concentration in Ta-TiO2 epitaxial films

et al. 2011

View full text Add to dashboard Cite

Electrochemical impedance spectroscopy measurements of pulsed laser deposited single crystal anatase TiO2 thin films with various concentrations of Ta substituting for Ti were carried out. The qualities of the films were characterized by X-ray diffraction and Rutherford back scattering-channeling measurements. UV-visible measurements show a systematic increase of the bandgap with Ta incorporation. Corresponding Mott-Schottky plot was applied to obtain a continuous shift of the flat band potential with increasing free charge carrier (provided by Ta) concentration. This was verified theoretically by ab initio calculation which shows that extra Ta d-electrons occupy Ti t2g orbital with increasing Ta concentration, thereby pushing up the Fermi level. The Mott-Schottky results were consistent when compared with Hall effect and temperature dependent resistivity measurements. From the measured deviation of carrier densities from Hall and Mott-Schottky measurements we have estimated the static dielectric constant of the TiO2 as a function of Ta incorporation, not possible from capacitive measurements

show abstract

On the determination of the flat-band potential of a semiconductor in contact with a metal or an electrolyte from the Mott-Schottky plot

Cited by 374 publications

References 12 publications

WS2 as an Effective Noble-Metal Free Cocatalyst Modified TiSi2 for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

WS2 as an Effective Noble-Metal Free Cocatalyst Modified TiSi2 for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

Enhanced photocatalytic performance of Au nanoparticles-modified rose flower-like Bi<sub>2</sub>WO<sub>6</sub> hierarchical architectures

Scaling of flat band potential and dielectric constant as a function of Ta concentration in Ta-TiO2 epitaxial films

Contact Info

Product

Resources

About