Structural and electrochemical properties of opaque sol–gel deposited WO3 layers

Leftheriotis, G.; Papaefthimiou, Spiros; Yianoulis, P.; Siokou, A.; Kefalas, Dimitris

doi:10.1016/s0169-4332(03)00616-0

Cited by 105 publications

(71 citation statements)

References 16 publications

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“…This is induced by the nanostructure and the rough surface of films b and c. During the CV, the color of the film changes reversibly from pale yellow to dark blue on reduction, and it reverts to pale yellow during anodization. These effects are due to the reversible changes between WO 3 and the blue-colored tungsten bronze (H x WO 3 ) [5].…”

Section: Resultsmentioning

confidence: 99%

“…Tungsten trioxide (WO 3 ) is an n-type semiconductor with a range of potential applications including: gas sensing [1,2], electrochromic windows and displays [3][4][5][6], catalysis [7] and photooxidation of water [8][9][10][11][12][13]. The ultimate of this study is to prepare efficient, adherent, chemicallyand electrochemically-stable WO 3 films with high photocatalytic activity which can be used for water splitting using sun light.…”

Section: Introductionmentioning

confidence: 99%

“…Tungsten trioxide films can be synthesized by several different physical and chemical techniques such as vapor deposition, sputtering, electrodeposition [13][14][15] and solgel processing [4][5][6]16]. The sol-gel method in particular has several advantages, namely: low cost, ease with which large surfaces can be coated, control of film thickness, and the ability to prepare a range of mesoporous structures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tungsten Trioxide Films with Controlled Morphology and Strong Photocatalytic Activity via a Simple Sol–Gel Route

Yang

Barnes²,

Zhang

et al. 2007

Catal Lett

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Novel nanostructured tungsten trioxide (WO 3 ) films with strong photocatalytic activity, have been prepared by a simple sol-gel route from aqueous peroxopolytungstic acid (PTA) precursor solutions. We demonstrate that films with different morphologies can be synthesized by simply adjusting the pH of this precursor solution using different mineral acids such as HCl and HC1O 4 , and that this control of film texture represents a way of optimizing photocurrent yield. The best films produced using these methods generated anodic photocurrents of 3.8 mA/cm 2 for oxidiation of methanol and 2.2 mA/cm 2 for water splitting, under AM1.5 simulated solar illumination.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tungsten Trioxide Films with Controlled Morphology and Strong Photocatalytic Activity via a Simple Sol–Gel Route

Yang

Barnes²,

Zhang

et al. 2007

Catal Lett

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“…7e f, respectively. The binding energy of O1s of oxygen atoms O 2− is located at 530.87 and 530.6 eV in the bleached and colored states, respectively [35,36]. This O 1s peak is assigned to the oxygen atoms that form the strong W=O bonds in the oxide.…”

Section: Electrochemical Properties Of Wo 3 Film Annealed At 250°cmentioning

confidence: 97%

Efficient electrochromic device based on sol–gel prepared WO3 films

Zhao

Zhang

Dong

et al. 2015

Ionics

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Tungsten oxide (WO 3 ) films were prepared on indium-tin oxide (ITO) glass by sol-gel method. The influence of annealing temperature on the structural, morphological, optical, electrochemical, and electrochromic properties has been investigated. The film annealed at 250°C with an amorphous structure exhibits a noticeable electrochromic performance, such as the highest optical modulation of 58.5 % at 550 nm, high electrochemical stability, and excellent reversibility (Q b /Q c =96.3 %). An electrochromic (EC) device based on WO 3 /NiO complementary structure shows improved performance. It exhibits high optical transmittance modulation of 62 % at 550 nm, excellent cycling stability, and relatively fast electrochromic response time (10 s for coloration and 19 s for bleaching).

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“…We developed laboratory prototypes with dimensions up to 40 cm × 40 cm, exhibiting great uniformity and excellent properties. Details on all this work can be found in the literature [20][21][22][23][24][25][26][27][28]. The equipment used is shown in Figure 2.…”

Section: Electrochromic Smart Windows and Passive Solar And Energy Comentioning

confidence: 99%

Thin Solid Films and Nanomaterials for Solar Energy Conversion and Energy Saving Applications

Yianoulis

Giannouli

2008

JNanoR

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Important new applications are possible today in the fields of energy conversion and storage by the application of thin and nanostructured solid films on surfaces. These special films, or multiple films, will be integral parts of the energy systems in the near future for the production of useful thermal and electrical energy and for energy saving applications, especially in buildings. We review the research in this direction. As we are facing the threats of insufficient energy supply and the greenhouse gas emissions from the intense use of fossil sources, we realize that the impacts as well as the future of the solar energy systems have been greatly underestimated. We review the work on solar thermal systems and energy saving applications. The efficient use of solar thermal technologies is very important for the introduction of a sizeable share of environmentally friendly renewable energy sources. New and nano structured materials along with the design and the geometry of advanced systems, capable of achieving high temperatures, as well as on integrated collection and storage systems have been proposed. Recent progress in high-vacuum technology and new materials had a remarkable effect in thin-film quality and cost. As a result new thermal absorbers have appeared along with new evaluation methods. We also present work on low-e coatings and electrochromic thin films that are very important for thermal energy savings in buildings and increase the efficiency of devices. For the photovoltaic solar energy conversion we present results on thin film solar cells and the efforts on dye sensitized nanostructured and organic solar cells. IntroductionIn the near future nanotechnology may contribute to efficient and low-cost systems for generating, storing, and transporting energy. Materials and structures that are designed and fabricated at the nanoscale level and thin films can offer the potential to produce new devices and processes that may enhance efficiencies and reduce costs in many areas, as solar photovoltaic systems, hydrogen production, fuel cells, solar thermal systems and energy saving technologies as low e-coatings and electrochromic devices for smart windows. It is often overlooked that the portion of contribution of renewable energy sources to the total energy budget will come from all possible forms of applications and sources and to be effective it must be combined with energy saving technological breakthroughs.It is essential to evaluate the energy sources and technologies of conversion, realizing that we may underestimate the contribution and the potential for some of them. For example, wind power is commonly considered more important than solar thermal. However, in terms of worldwide installed capacities and overall energy produced, solar thermal surpasses both wind power and photovoltaic. It is usually less expensive and more energy efficient to exploit the thermal uses of solar energy,

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Structural and electrochemical properties of opaque sol–gel deposited WO3 layers

Cited by 105 publications

References 16 publications

Tungsten Trioxide Films with Controlled Morphology and Strong Photocatalytic Activity via a Simple Sol–Gel Route

Tungsten Trioxide Films with Controlled Morphology and Strong Photocatalytic Activity via a Simple Sol–Gel Route

Efficient electrochromic device based on sol–gel prepared WO3 films

Thin Solid Films and Nanomaterials for Solar Energy Conversion and Energy Saving Applications

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