Morphology-controlled synthesis of tungsten oxide hydrates crystallites via a facile, additive-free hydrothermal process

Li, Jiayin; Huang, Jianfeng; Wu, Jianpeng; Cao, Liyun; Yanagisawa, Kazumichi

doi:10.1016/j.ceramint.2012.02.025

Cited by 17 publications

(14 citation statements)

References 25 publications

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“…An aqueous solution of peroxopolytungstic acid (PTA) [78,79] with controlled acidity [2] (addition of HCl) was used as a source of tungsten. Selected precursor was then subjected to hydrothermal conditions in Teflon-lined stainless-steel autoclave, which imply elevated temperature (180 C) and high vapor pressure (~1.1 MPa) for a certain period of time enabling nucleation and growth of crystallites.…”

Section: Structure and Morphology Of Synthesized Productsmentioning

confidence: 99%

Metal Oxide Nanoparticle Engineering for Printed Electrochemical Applications

Wójcik

Pereira

Martins

et al. 2015

Handbook of Nanoelectrochemistry

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Engineering procedures governing the selection or development of printable nanostructured metal oxide nanoparticles for chromic, photovoltaic, photocatalytic, sensing, electrolyte-gated TFTs, and power storage applications are established in this chapter. The main focus is given on how to perform the material selection and formulation of printable dispersion in order to develop functional films for electrochemical applications.This chapter is divided into four main parts. Firstly, a brief introduction on electrochemically active nanocrystalline metal oxide films developed via printing techniques is given. This is followed by the description of the film morphology, structure, and required functionality. A theoretical approach to understand the impact of size and shape of nanoparticles on an ink formulation and electrochemical performance being the subject of the third section provides a greater control over the material selection. We attempt to describe these properties and show that for a given material, geometry and size of the nanoparticles have a major influence on the electrochemical reactivity and response time. This gives the ability to tune the performance of the film simply by varying the morphology of incorporated nanostructures. This section is completed by the recommendations on each major step of an ink formulation, together with imposed critical constraints concerning the fluid control. Finally, the performance of the ink-jet-printed dual-phase electrochromic films is discussed as a case study.By providing such a rather systematic survey, we aim to stress the importance of proper design strategy that would result in both improved physicochemical properties of nanoparticle-loaded inks and enhanced electrochemical performance of printed functional films.

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Section: Structure and Morphology Of Synthesized Productsmentioning

confidence: 99%

Metal Oxide Nanoparticle Engineering for Printed Electrochemical Applications

Wójcik

Pereira

Martins

et al. 2015

Handbook of Nanoelectrochemistry

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“…[48] Further, Borgarello et al demonstrated that oxygen has a negative influence on the reduction of Rh III , but not on Pd II , but that both reactions benefit from the sacrifial agent methanol. [49] Different pH dependencies in the removal rate of an ionic metal compound were found as well for different aqueous metal ion mixtures. [49,61] Through a modelling study it was demonstrated that the extent of influence of a sacrificial agent (citric acid) can be different for the reduction of Cu II , Ni II , Zn II and Pb II .…”

Section: Figure 23 Photocatalytic Hydrogen Production In An Aqueousmentioning

confidence: 92%

“…[49] Different pH dependencies in the removal rate of an ionic metal compound were found as well for different aqueous metal ion mixtures. [49,61] Through a modelling study it was demonstrated that the extent of influence of a sacrificial agent (citric acid) can be different for the reduction of Cu II , Ni II , Zn II and Pb II . [62] Borgarello et al even showed that it is possible to selectively remove each metal compound from a solution containing multiple metal compounds by changing photodeposition parameters.…”

Section: Figure 23 Photocatalytic Hydrogen Production In An Aqueousmentioning

confidence: 92%

“…Nevertheless, there is some controversy in literature, as there are also studies which claim that the {001} facet does not necessarily have to be more active than the {101} facet. [49,50] Aside from TiO 2 anatase, crystal facet engineering has been performed on many other materials as well, for example on BiVO 4 [51] or perovskite oxides. [52] A very good overview of work performed in crystal facet engineering (up to 2011) can be found in the review article of Liu et al (Ref.…”

Section: Basics Of Crystal Facet Engineeringmentioning

confidence: 99%

“…Photodeposition of nanoparticles on TiO 2 has been employed by many researchers. The nanoparticles studied include noble metals such as Pt, [15,25,[32][33][34][35][36][37][38][39][40][41][42][43] Ag, [24,44,45] Au [31,46,47] and Pd, [48,49] metal oxides such as PbO 2 [50] and RuO 2 [51] and more complex nanoparticles such as CoPi. [52] Even the photodeposition of another photocatalyst, CdS, on TiO 2 has been performed.…”

Section: Photodeposition Of Particles On Tiomentioning

confidence: 99%

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Photodeposition of platinum nanoparticles on wel-defined tungsten oxide : controlling oxidation state, particle size and geometrical distribution

Wenderich¹

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Chapter 2-Principles, mechanism, and applications of photodeposition in (photo)catalysis 2.1 Introduction to photodeposition 2.2 Photodeposition of particles on TiO 2 2.3 Photodeposition of Ag on ZnO 2.4 Photodeposition of particles on WO 3 2.4.1 Photodeposition of Pt on WO 3 2.4.2 Photodeposition of other metals on WO 3 2.4.3 Photodeposition of Ag/AgX (X = Cl or Br) particles on WO 3 2.4.4 Photodeposition on composite photocatalysts containing WO 3 2.5 Structure-directed photodeposition 2.6 Points for improvement in photodeposition studies 2.6.1 Loading vs. doping 2.6.2 Verification of the valence state of as-deposited particles 2.6.3 Verification of wt loading 2.6.4 Measuring of the photon flux 2.6.5 Conclusions about bandgap change 2.6.6 Conclusions on favored reductive and oxidative sites 2.6.7 High temperature treatment 2.7 Summary and future perspectives of photodeposition 2.8 Bibliography Chapter 3-Towards temperature-dependent crystal facet engineering of hydrate-free WO 3 with plate-like morphology 3.1 Introduction 3.2 Materials and methods 3.3 Results and discussion 3.3.1 Characterization of as-synthesized WO 3 samples 3.3.2 Photocatalytic performance of synthesized WO 3 samples 3.4 Conclusions 3.5 Bibliography 3.6 Appendix Chapter 4-Phase transformations in citric acid-assisted hydrothermal growth of WO 3 and implications for photocatalytic performance 4.1 Introduction 4.2 Materials and methods 4.3 Results and discussion 4.3.1 In situ Raman spectroscopy of crystal phases during hydrothermal synthesis of WO 3 4.3.2 Microwave-assisted hydrothermal synthesis experiments 4.3.3 Photocatalytic activity tests 4.4 Conclusions 4.5 Bibliography 4.6 Appendix Chapter 5-Photodeposition mechanism of platinum on tungsten oxide and its corresponding stability upon aqueous phase illumination 5.

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Structure and Morphologic Influence of WO₃ Nanoparticles on the Electrochromic Performance of Dual‐Phase a‐WO₃/WO₃ Inkjet Printed Films

Santos

Wójcik

Pinto

et al. 2015

Adv Elect Materials

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The optimization of tungsten trioxide (WO3) nanoparticles produced via hydrothermal synthesis for application in electrochromic (EC) devices is reported. The structure and morphology of the nanoparticles are controlled by changing the acidity of the aqueous solvent added to the sol‐gel precursor (peroxopolytungstic acid) during synthesis. Orthorhombic hydrated WO3 nanorods or monoclinic WO3 nanoslabs are obtained when HCl is added, while synthesis only in aqueous medium results in a mixture of both types of polymorphs. Dual‐phase thin films are processed by inkjet printing deposition of the nanoparticles in flexible polyethylene terephthalate substrate with indium tin oxide coating (ITO PET) followed by the deposition of the precursor solution. When compared with purely amorphous tungsten oxide films, the dual phase ones present higher optical densities and improved capacity, and cyclability stability. The best results, obtained for orthorhombic hydrated nanoparticles (ortho‐WO3·0.33H2O), are due to its high surface area and improved conductivity. Additionally, the ex situ X‐ray diffraction (XRD) lithiation studies show evidence of a higher distortion of the monoclinic when compared with the orthorhombic crystallographic structure, which contribute to the inferior EC performance. These results validate the use of inkjet printing deposition with low processing temperatures for EC dual‐phase thin films containing optimized nanoparticles which are compatible with low‐cost substrates.

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Morphology-controlled synthesis of tungsten oxide hydrates crystallites via a facile, additive-free hydrothermal process

Cited by 17 publications

References 25 publications

Metal Oxide Nanoparticle Engineering for Printed Electrochemical Applications

Metal Oxide Nanoparticle Engineering for Printed Electrochemical Applications

Photodeposition of platinum nanoparticles on wel-defined tungsten oxide : controlling oxidation state, particle size and geometrical distribution

Structure and Morphologic Influence of WO₃ Nanoparticles on the Electrochromic Performance of Dual‐Phase a‐WO₃/WO₃ Inkjet Printed Films

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Morphology-controlled synthesis of tungsten oxide hydrates crystallites via a facile, additive-free hydrothermal process

Cited by 17 publications

References 25 publications

Metal Oxide Nanoparticle Engineering for Printed Electrochemical Applications

Metal Oxide Nanoparticle Engineering for Printed Electrochemical Applications

Photodeposition of platinum nanoparticles on wel-defined tungsten oxide : controlling oxidation state, particle size and geometrical distribution

Structure and Morphologic Influence of WO3 Nanoparticles on the Electrochromic Performance of Dual‐Phase a‐WO3/WO3 Inkjet Printed Films

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Structure and Morphologic Influence of WO₃ Nanoparticles on the Electrochromic Performance of Dual‐Phase a‐WO₃/WO₃ Inkjet Printed Films