Electronic structures of MRhO2, MRh2O4, RhMO4 and Rh2MO6 on the basis of X-ray spectroscopy and ESCA data

Нефедов, В. И.; Firsov, M. N.; Shaplygin, I. S.

doi:10.1016/0368-2048(82)87006-0

Cited by 317 publications

(137 citation statements)

References 4 publications

Supporting

Mentioning

116

Contrasting

Order By: Relevance

“…This would be in line with the higher W to O ratio, and also with the fact that the W 4f and O 1s signals are slightly shifted towards higher B.E. compared to data reported in the literature [54,55]. The HR-XPS spectra in Fig.…”

Section: à2supporting

confidence: 87%

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Upadhyay

Altomare

Eugénio

et al. 2017

Electrochimica Acta

View full text Add to dashboard Cite

Keywords: electrochemical anodization WO 3 nanostructure phosphoric acid supercapacitor energy storage A B S T R A C T Herein we illustrate the functionality as pseudocapacitive material of tungsten trioxide (WO 3 ) nanochannel layers fabricated by electrochemical anodization of W metal in pure hot ortho-phosphoric acid (o-H 3 PO 4 ). These layers are characterized by a defined nanochannel morphology and show remarkable pseudocapacitive behaviour in the negative potential (À0.8-0.5 V) in neutral aqueous electrolyte (1 M Na 2 SO 4 ). The maximum volumetric capacitance of 397 F cm À3 is obtained at 2 A cm À3. The WO 3 nanochannel layers display full capacitance retention (up to 114%) after 3500 charge-discharge cycles performed at 10 A cm À3 . The relatively high capacitance and retention ability are attributed to the high surface area provided by the regular and defined nanochannel morphology. Kinetic analysis of the electrochemical results for the best performing WO 3 structures, i.e., grown by 2 h-long anodization, reveals the occurrence of pseudocapacitance and diffusional controlled processes. Electrochemical impedance spectroscopy measurements show for the same structures a relatively low electrical resistance, which is the plausible cause for the superior electrochemical behaviour compared to the other structures.

show abstract

Section: à2supporting

confidence: 87%

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Upadhyay

Altomare

Eugénio

et al. 2017

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…3. The binding energies of Bi4f 7∕2 (159.0 eV), V2p 3∕2 (516.7 eV), and O1s (529.7 eV) of the BiVO 4 thin film calcined at 673 K were coincident with literature's data of BiVO 4 (s-m) (48,49). The deconvoluted O1s peak at 531.6 eV was assigned to surface hydroxyl groups (50,51).…”

supporting

confidence: 75%

Facile fabrication of an efficient BiVO ₄ thin film electrode for water splitting under visible light irradiation

Jia

Iwashina²,

Kudo³

2012

Proc. Natl. Acad. Sci. U.S.A.

293

186

View full text Add to dashboard Cite

An efficient BiVO 4 thin film electrode for overall water splitting was prepared by dipping an F-doped SnO 2 (FTO) substrate electrode in an aqueous nitric acid solution of BiðNO 3 Þ 3 and NH 4 VO 3 , and subsequently calcining it. X-ray diffraction of the BiVO 4 thin film revealed that a photocatalytically active phase of scheelite-monoclinic BiVO 4 was obtained. Scanning electron microscopy images showed that the surface of an FTO substrate was uniformly coated with the BiVO 4 film with 300-400 nm of the thickness. The BiVO 4 thin film electrode gave an excellent anodic photocurrent with 73% of an IPCE at 420 nm at 1.0 V vs. Ag∕AgCl. Modification with CoO on the BiVO 4 electrode improved the photoelectrochemical property. A photoelectrochemical cell consisting of the BiVO 4 thin film electrode with and without CoO, and a Pt counter electrode was constructed for water splitting under visible light irradiation and simulated sunlight irradiation. Photocurrent due to water splitting to form H 2 and O 2 was confirmed with applying an external bias smaller than 1.23 V that is a theoretical voltage for electrolysis of water. Water splitting without applying external bias under visible light irradiation was demonstrated using a SrTiO 3 ∶Rh photocathode and the BiVO 4 photoanode.hydrogen production | solar energy conversion | visible light response T he development of powdered photocatalysts and semiconductor photoelectrodes for water splitting have been studied extensively in view of utilization of solar energy, since the report of the Honda-Fujishima effect (1). There are advantageous and disadvantageous points for water splitting using the powdered photocatalysts and photoelectrochemical cells. Although a powdered photocatalyst system is simple, H 2 and O 2 are produced as a mixture. In contrast to it, photoelectrochemical cells give H 2 separately from O 2 gas. Moreover, even if powdered photocatalysts do not possess band potentials suitable for water splitting (the bottom of the conduction band <0 V and the top of the valence band >1.23 V vs. NHE at pH 0), water splitting may be achieved by application of these powdered photocatalysts to photoelectrodes with applying some external bias. However, the electrical conductivity of semiconductor electrode is indispensable, resulting in that the number of the photoelectrode materials is limited.It has been reported that many metal oxides are active photocatalysts for water splitting into H 2 and O 2 stoichiometrically under UV light irradiation (2). Photoelectrodes, such as TiO 2 (1, 3, 4), SrTiO 3 (5, 6), BaTiO 3 (7), and KTaO 3 (8) have been reported for photoelectrochemical water splitting under UV light irradiation. Development of a photoelectrode material with visible light response has been sought for efficient utilization of solar energy. It has been reported that Fe 2 O 3 (9-11), WO 3 (12-14), BiVO 4 (15-24), and SrTiO 3 ∶Rh (25) of metal oxide electrodes respond to visible light. Recently, some (oxy) nitride materials such as TaON (26,27), Ta 3 N 5 (27, 28), SrN...

show abstract

“…Three fairly well resolved peaks might be seen in Fig. 1, indicating that three different data sets (corresponding to V 2 O 5 , 516.3 [14,17] 516.4 [18] 516.45 [19] 516.5 [20] 516.55 [13, 517.3 [28] 517.4 [20,[29][30][31] 517.45 [19] 517.6 [13] 517.65 [32] 517.7 [32][33][34] VO 2 , and V 2 O 3 reference samples) are involved in the distribution function. Further analysis was done assuming that the reference data for individual oxides are distributed according to the Gaussian law:…”

Section: Literature Analysismentioning

confidence: 99%

“…2. It is evident that either CS 45 and CS 43 may be approximated by the individual Gaussian distribution (X in (2) denote CS) with the centres located at −0.4 and 1.0 eV for CS 34 and CS 54 , respectively. These values are in good agreement with the previously obtained results (Fig.…”

Section: Literature Analysismentioning

confidence: 99%

Valence of vanadium in hydrated compounds

Bondarenka¹

2007

Lithuanian J. Phys.

View full text Add to dashboard Cite

Problems of the definition of vanadium chemical states in the mixed valency compounds are examined. The statistical analysis of the literature data on the values of binding energy and full width at half maximum (FWHM) of V 2p 3/2 peaks in different vanadium oxides is carried out.X-ray photoelectron spectroscopy was used to determine the chemical shift and FWHM of V 2p peaks of V 4+ and V 5+cations in the vanadium pentoxide matrix of hydrated vanadium compounds HV12O31·nH2O and (VO)V12O31·nH2O, prepared by using sol-gel technology. It was found that the binding energy of V 4+ ions shifts to the lower energy side of about 1.3 eV as compared to the main V 5+ ions in the matrix. The V 2p 3/2 line width for tetra-valent vanadium ions in xerogels is actually the same as for penta-valent ions.

show abstract

Electronic structures of MRhO2, MRh2O4, RhMO4 and Rh2MO6 on the basis of X-ray spectroscopy and ESCA data

Cited by 317 publications

References 4 publications

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Facile fabrication of an efficient BiVO ₄ thin film electrode for water splitting under visible light irradiation

Valence of vanadium in hydrated compounds

Contact Info

Product

Resources

About

Electronic structures of MRhO2, MRh2O4, RhMO4 and Rh2MO6 on the basis of X-ray spectroscopy and ESCA data

Cited by 317 publications

References 4 publications

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Facile fabrication of an efficient BiVO 4 thin film electrode for water splitting under visible light irradiation

Valence of vanadium in hydrated compounds

Contact Info

Product

Resources

About

Facile fabrication of an efficient BiVO ₄ thin film electrode for water splitting under visible light irradiation