Band offsets of novel CoTiO3/Ag3VO4 heterojunction measured by X-ray photoelectron spectroscopy

Wangkawong, Kanlayawat; Tantraviwat, Doldet; Phanichphant, Sukon; Inceesungvorn, Burapat

doi:10.1016/j.apsusc.2014.11.020

Cited by 26 publications

(17 citation statements)

References 28 publications

(55 reference statements)

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“…Herein, we present a brief overview on the recent progress of g-C 3 N 4 -based photocatalysts. Many methods, such as doping [6][7][8], the introduction of nitrogen deficient [9,10], forming composite with graphene [11][12][13][14], metal [15][16][17], metal oxide [18][19][20][21][22][23] and others [24][25][26][27], can effectively improve the dissociation efficiency of water. The g-C 3 N 4 nanosheets not only can enhance the photoabsorption but can provide high specific surface areas [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

The role of the defect on the adsorption and dissociation of water on graphitic carbon nitride

Liu

Zhao

2015

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

The role of the defect on the adsorption and dissociation of water on graphitic carbon nitride

Liu

Zhao

2015

Applied Surface Science

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“…Brunauer-Emmett-Teller specific surface area (SSA BET ) was investigated by Autosorp 1 MP, Quantachrome analyzer with N 2 adsorption isotherm. Details on the microstructures of Ag 3 VO 4 , CoTiO 3 and 50% CoTiO 3 /Ag 3 VO 4 composite from scanning electron microscopy (SEM, JEOL JSM-6335F) and transmission electron microscopy (TEM, FEI TECNAI G2 F20) studies were reported in our previous studies [17,18]. Photocatalytic activity of the samples was evaluated via the MB degradation under visible light irradiation (k > 400 nm) by using a 50 W Halogen lamp as a light source (Phillips, an intensity of $640 W/m 2 ).…”

Section: Methodsmentioning

confidence: 99%

“…Compared with that of pure Ag 3 VO 4 , the scavenging effect in the composite system is more pronounced, implying that the formation rates of the active species are higher than those in the Ag 3 VO 4 system. This may be ascribed to a high generation of active species as a result of an improved visible light absorption and an efficient e À -h + separation upon the heterojunction formation between CoTiO 3 and Ag 3 VO 4 [17,18]. The strongest inhibition effect of Na 2 EDTA on the photodegradation activity suggests that h + is the predominant active species and the degradation of MB in the CoTiO 3 /Ag 3 VO 4 system is mainly governed by direct hole oxidation, which is consistent with literatures [1,12,14,15].…”

Section: Role Of Active Speciesmentioning

confidence: 98%

“…The enhanced activity was partially ascribed to an efficient electron-hole (e À -h + ) separation of the CoTiO 3 /Ag 3 VO 4 composite as evidenced by photoluminescence (PL) measurement [17]. Energy band alignment from X-ray photoelectron spectroscopy (XPS) study also suggested that the composite was a type-II heterojunction where e À -h + can be effectively separated [18]. This very well supports the PL results and helps explain such enhanced photocatalytic performance observed from the hybrid catalyst.…”

Section: Introductionmentioning

confidence: 95%

“…However, its photocatalytic performance was significantly improved upon coupling the material with cobalt titanate (CoTiO 3 ) [17,18]. The enhanced activity was partially ascribed to an efficient electron-hole (e À -h + ) separation of the CoTiO 3 /Ag 3 VO 4 composite as evidenced by photoluminescence (PL) measurement [17].…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

CoTiO3/Ag3VO4 composite: A study on the role of CoTiO3 and the active species in the photocatalytic degradation of methylene blue

Wangkawong

Phanichphant

Tantraviwat

et al. 2015

Journal of Colloid and Interface Science

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Crystalline Mesoporous Complex Oxides: Porosity‐Controlled Electromagnetic Response

Liu

Shi

et al. 2020

Adv Funct Materials

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A colloidal-amphiphile-templated growth is developed to synthesize mesoporous complex oxides with highly crystalline frameworks. Organosilane-containing colloidal templates can convert into thermally stable silica that prevents the overgrowth of crystalline grains and the collapse of the mesoporosity. Using ilmenite CoTiO 3 as an example, the high crystallinity and the extraordinary thermal stability of its mesoporosity are demonstrated at 800 °C for 48 h under air. This synthetic approach is general and applicable to a series of complex oxides that are not reported with mesoporosity and high crystallinity, such as NiTiO . Those novel materials make it possible to build up correlations between mesoscale porosity and surfacesensitive physicochemical properties, e.g., electromagnetic response. For mesoporous CoTiO 3 , there is a 3 K increase of its antiferromagnetic ordering temperature, compared with that of nonporous one. This finding provides a general guideline to design mesoporous complex oxides that allow exploring their unique properties different from bulk materials.complex oxides, in general, has associated kinetic barriers from the slow diffusion in solids. [15] When there are two metal cations involved in crystallization of complex oxides like ABO 3 , their nonuniform distribution can result in spontaneous phase separation to form simple oxides. [16] A delicate balance of their sol-gel rates and the precautious control of thermal annealing procedure is needed. On the other hand, ordering competition between the crystallization of oxides and the mesoscale porosity brings profound difficulties to synthesize complex oxides (e.g., perovskites and ilmenites) with mesoporous structures. Crystallization usually leads to the formation of large crystalline grains that will create strong interfacial energies between crystalline walls and pores (e.g., air or templates). For any templated growth of mesoporous oxides using hydrocarbon-based surfactants or block copolymers (BCPs) as soft templates, [17][18][19] mesoscale nanostructures collapse prior to the crystallization of oxides, [20][21][22] because these soft templates are not mechanically strong and thermally stable under elevated temperatures (i.e., >500 °C).Nanostructures show a profound impact on the magnetic properties of materials as well and a few theoretical models have been proposed to understand magnetic behavior of nanoscale particles. [23][24][25][26][27][28][29][30] The magnetic ordering temperature (Curie temperature or Néel temperature) in magnetic materials

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Band offsets of novel CoTiO3/Ag3VO4 heterojunction measured by X-ray photoelectron spectroscopy

Cited by 26 publications

References 28 publications

The role of the defect on the adsorption and dissociation of water on graphitic carbon nitride

The role of the defect on the adsorption and dissociation of water on graphitic carbon nitride

CoTiO3/Ag3VO4 composite: A study on the role of CoTiO3 and the active species in the photocatalytic degradation of methylene blue

Crystalline Mesoporous Complex Oxides: Porosity‐Controlled Electromagnetic Response

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