Controllable synthesis of WO3·nH2O microcrystals with various morphologies by a facile inorganic route and their photocatalytic activities

Shi, Jichao; Hu, Gujin; Cong, Rui; Bu, Hongmei; Dai, Ning

doi:10.1039/c3nj41159a

Cited by 63 publications

(42 citation statements)

References 51 publications

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“…By comparing the annealing temperature effect, the

{normalC normalu normalW normalO}_{4}

/CuO (800 °C) showed that slightly higher k than that of

{normalC normalu normalW normalO}_{4}

/CuO (700 °C) due to better crystallinity attained and more CuO formation. By comparing the W‐rich

{normalC normalu normalW normalO}_{4}

nanocomposites, the

{C u W O}_{4} / {W O}_{3} {\cdot 0.33 H}_{2} O

showed more k compared to

{C u W O}_{4} / {W O}_{3}

ascribed to more dye molecule absorption by

{W O}_{3} {\cdot 0.33 H}_{2} O

than

{normalW normalO}_{3}

…”

Section: Resultsmentioning

confidence: 99%

“…By comparing the W-rich CuWO 4 nanocomposites, the CuWO 4 =WO 3 Á0:33H 2 O showed more k compared to CuWO 4 =WO 3 ascribed to more dye molecule absorption by WO 3 Á0:33H 2 O than WO 3 . [52] To understand the photocatalytic degradation, the conduction and valence bands position in the prepared samples were determined using the following equations (4) and (5).…”

Section: Photocatalytic Analysismentioning

confidence: 99%

See 1 more Smart Citation

Preparation of Bifunctional CuWO₄‐Based Heterostructure Nanocomposites for Noble‐Metal‐Free Photocatalysts

2017

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This article describes the preparation of copper tungstate (normalCnormalunormalWnormalO4 )‐based heterostructured nanocomposites by facile two‐step polyol assisted hydrothermal‐annealed process. A series of characterization techniques (FESEM, EDS, HRTEM, XPS, XRD and FTIR etc.) were confirmed the formation of type‐I(CuWO4/WO3·0.33H2O, CuWO4/WO3 ) and type‐II (CuWO4/Cu2O,CuWO4/Cu2O/normalCnormalunormalO,CuWO4/normalCnormalunormalO) heterojunction as function of pH and annealing temperatures. Also WO3·0.33H2O , normalWnormalO3 , Cu2O , Cu2O/normalCnormalunormalO and CuO were found as secondary phases with normalCnormalunormalWnormalO4 . These nanocomposites exhibited the enhanced visible light absorption and the band gap (ca. 1.7 eV) of normalCnormalunormalWnormalO4 is smaller than the early reported value (2.1‐2.3 eV). In photocatalytic degradation, the normalCnormalunormalWnormalO4 /Cu2O/normalCnormalunormalO and CuWO4/WO3·0.33H2O were showed 1.66 fold times higher and nearly equal apparent rate constant respectively than that of normalCnormalunormalWnormalO4 . In photoelectrochemical (PEC) studies, the CuWO4/Cu2O , normalCnormalunormalWnormalO4 /Cu2O/normalCnormalunormalO , CuWO4/WO3 and CuWO4/normalCnormalunormalO nanocomposites showed more photocurrent density of 3.5, 2.2, 0.71 and 0.41 mA/cm2 at 1.23 VRHE respectively than CuWO4. The existence of dual co‐catalysts (Cu2O and CuO) with CuWO4, strongly promote the electron‐hole pair separation and migration. Among the nanocomposite, the CuWO4/normalCnormalunormalO was showed the similar static photocurrent as that of normalCnormalunormalWnormalO4 under 1 Sun illumination. The advantage of present work is noble‐metal‐free photocatalysts prepared with binder free, less time, low energy consumption and cost, and environmental benign.

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“…By comparing the annealing temperature effect, the

{normalC normalu normalW normalO}_{4}

/CuO (800 °C) showed that slightly higher k than that of

{normalC normalu normalW normalO}_{4}

/CuO (700 °C) due to better crystallinity attained and more CuO formation. By comparing the W‐rich

{normalC normalu normalW normalO}_{4}

nanocomposites, the

{C u W O}_{4} / {W O}_{3} {\cdot 0.33 H}_{2} O

showed more k compared to

{C u W O}_{4} / {W O}_{3}

ascribed to more dye molecule absorption by

{W O}_{3} {\cdot 0.33 H}_{2} O

than

{normalW normalO}_{3}

…”

Section: Resultsmentioning

confidence: 99%

Section: Photocatalytic Analysismentioning

confidence: 99%

Preparation of Bifunctional CuWO₄‐Based Heterostructure Nanocomposites for Noble‐Metal‐Free Photocatalysts

2017

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“…Moreover, a selected area electron diffraction (SAED) pattern reveals that the rod is hexagonal phase with the <0 0 1> growth direction (inset of Fig. 2f) [23]. The more detailed SAED pattern as shown in Supporting Information ( Figure SI1) supports that a compact homojunction consisted of hexagonal and cubic phases is achieved via a one-step hydrothermal method.…”

Section: Material's Characterizationmentioning

confidence: 86%

“…Furthermore, the tungsten oxide-based materials appear some different crystal structures including tungsten bronze-type hexagonal, pyrochlore-type cubic and so on, which suggests a potential in constructing homojunction photocatalysts. In the previous studies, both tungsten bronze-type hexagonal phase and pyrochlore-type cubic phase have received attentions for application to photocatalyst and show a high activity for degrading pollution and splitting water [22][23][24]. It should be emphasized that the realization of efficient homojunction demands the energy structure match between two different phases, which has been used as the standard to constitute homojunction from a series of existing phases.…”

Section: Introductionmentioning

confidence: 98%

Fabrication of hexagonal/cubic tungsten oxide homojunction with improved photocatalytic activity

Kong

Sun

Zhao

et al. 2015

Applied Catalysis A: General

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“…22 Su and co-workers respectively used equal amounts of L(+)-tartaric acid and citric acid as assistant agents and adjusted the initial pH of the solution to 1 using hydrochloric acid, and accordingly to obtain the hexagonal phase and orthorhombic phase of tungsten trioxide. 35 This shows that the chemical composition in the solution can also have an impact on the crystal structure in addition to the factor of pH.…”

Section: Phase Composition and Microstructurementioning

confidence: 99%

Solvothermal synthesis of pyrochlore-type cubic tungsten trioxide hemihydrate and high photocatalytic activity

Zheng

Chen

et al. 2014

New J. Chem.

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Pyrochlore-type cubic phase tungsten trioxide hemihydrate (c-WO 3 Á0.5H 2 O) has been synthesized for the first time via a simple solvothermal process. The photocatalytic properties have been investigated firstly by the photodegradation of RhB, where the c-WO 3 Á0.5H 2 O sample demonstrated high photocatalytic activity, indicating that c-WO 3 Á0.5H 2 O is a promising candidate for tungsten oxide-based photocatalytic materials. The investigation result of the crystal water effects on the photocatalytic activity showed that crystal water of c-WO 3 Á0.5H 2 O played a key role in the photocatalytic activity. The novel method reported in this study has great potential for the development of tungsten trioxide-based functional materials preparation, to improve their photocatalytic efficiency in the elimination of hazardous substance applications as well as for energy materials.

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Controllable synthesis of WO3·nH2O microcrystals with various morphologies by a facile inorganic route and their photocatalytic activities

Cited by 63 publications

References 51 publications

Preparation of Bifunctional CuWO₄‐Based Heterostructure Nanocomposites for Noble‐Metal‐Free Photocatalysts

Preparation of Bifunctional CuWO₄‐Based Heterostructure Nanocomposites for Noble‐Metal‐Free Photocatalysts

Fabrication of hexagonal/cubic tungsten oxide homojunction with improved photocatalytic activity

Solvothermal synthesis of pyrochlore-type cubic tungsten trioxide hemihydrate and high photocatalytic activity

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Controllable synthesis of WO3·nH2O microcrystals with various morphologies by a facile inorganic route and their photocatalytic activities

Cited by 63 publications

References 51 publications

Preparation of Bifunctional CuWO4‐Based Heterostructure Nanocomposites for Noble‐Metal‐Free Photocatalysts

Preparation of Bifunctional CuWO4‐Based Heterostructure Nanocomposites for Noble‐Metal‐Free Photocatalysts

Fabrication of hexagonal/cubic tungsten oxide homojunction with improved photocatalytic activity

Solvothermal synthesis of pyrochlore-type cubic tungsten trioxide hemihydrate and high photocatalytic activity

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Preparation of Bifunctional CuWO₄‐Based Heterostructure Nanocomposites for Noble‐Metal‐Free Photocatalysts

Preparation of Bifunctional CuWO₄‐Based Heterostructure Nanocomposites for Noble‐Metal‐Free Photocatalysts