Experimental Photographic Systems Based on Phosphotungstic Acid

Chalkley, Lyman

doi:10.1364/josa.44.000699

Cited by 12 publications

(5 citation statements)

References 3 publications

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“…An amorphous molybdenum blue is obtained upon photolysis of strongly acidic, aqueous molybdate solutions and may be related to Na 15 [Mo 144 O 409 (OH) 28 (H 2 O) 56 ]·∼250H 2 O which is reductively prepared using iron powder . Other reduced polyoxometalates, such as the two-electron-reduced anions, α-[H 2 AsMo 12 O 40 ] − …”

Section: Photoinduced Formation Of Heteropoly Bluesmentioning

confidence: 99%

“…1,2 The photoredox reactions of H 4 [SiW 12 O 40 ] and H 3 [PW 12 O 40 ] proceeded effectively in the presence of primary and secondary alcohols, their ethers and aldehydes, and proteins, but less effectively in the presence of tertiary alcohols, ketones, esters, the fatty acids above formic acid, and simple amines. 3,4 The basic photoredox reaction involving ethanol is illustrated by eq 1.…”

Section: A Historical Backgroundmentioning

confidence: 99%

“…The photochemistry of polyoxometalates is of great interest to inorganic chemists. More than 80 years ago, it was found that the α-Keggin tungstate H 3 [PW 12 O 40 ] was reduced photochemically to yield a blue-colored species which was reoxidized by air and by various other oxidizing agents such as Fe 3+ , AgNO 3 , and H 2 O 2 . , The photoredox reactions of H 4 [SiW 12 O 40 ] and H 3 [PW 12 O 40 ] proceeded effectively in the presence of primary and secondary alcohols, their ethers and aldehydes, and proteins, but less effectively in the presence of tertiary alcohols, ketones, esters, the fatty acids above formic acid, and simple amines. , The basic photoredox reaction involving ethanol is illustrated by eq 1 In this reaction, one molecule of ethanol photochemically reduces two molecules of H 3 PW 12 O 40 and is itself oxidized to acetaldehyde.…”

Section: Introductionmentioning

confidence: 99%

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Photo- and Electrochromism of Polyoxometalates and Related Materials

1998

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ContentsI. Introduction 307 A. Historical Background 307 B. Scope and Limitations 308 II. Photochromism and Electrochromism of Metal Oxides 309 A. Photoinduced Coloration of Metal Oxides Due to Impurity Effects 309 B. Electrochromism 310 1. WO 3 310 2. Other Metal Oxides 310 III. Photochromism of Polyoxometalate Solids 311 A. Alkylammonium Polyoxomolybdates 311 B. Other Polyoxometalates 314 IV. Electrochromism of Polyoxometalates 314 A. H 3 PW 12 O 40 314 B. K 0.33 WO 3.165 and Peroxopolytungstic Acids 314 V. Photoluminescence and Intramolecular Energy Transfer in Polyoxometalate Solids 315 A. Polyoxometalloeuropates 315 1. Structural Feature 315 2. Intramolecular Energy Transfer from the OfM LMCT States to Eu 3+ 316 B. OfM LMCT Triplet Emission 317 VI. Photoinduced Formation of Heteropoly Blues 318 A. Polyoxomolybdates 318 B. Polyoxotungstates 319 C. Polyoxovanadates and Self-Assembly Encapsulation 321 VII. Conclusions 322 VIII. Acknowledgments 323 IX. References 323

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Section: Photoinduced Formation Of Heteropoly Bluesmentioning

confidence: 99%

Section: A Historical Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photo- and Electrochromism of Polyoxometalates and Related Materials

1998

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“…It is well known that the redox properties depend on the energy and composition of the LUMO, as LUMO formally delocalizes over the metal atoms, which determine the redox properties of POMs [21]. Therefore, it can be proposed that both Ti and Nb have the probability to accept extra electron when [Ti 12 11Ϫ was performed in both the gas phase and solution. When calculation is carried out in the gas phase, the FMO usually have positive energies, but in solution, they are strongly stabilized by the effect of the solvent [38,39] 10Ϫ is connected to acid strength.…”

Section: Resultsmentioning

confidence: 99%

Theoretical studies on redox properties, protonation sites, and electronic spectrum of a new type of polyoxometalate [Ti₁₂Nb₆O₄₄]¹⁰⁻ by DFT

Chen

Wang

2009

Int J of Quantum Chemistry

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The 9Ϫ are discussed. The results reveal that the preferred protonation sites correspond to bridging oxygens NbOOOTi. In addition, the calculation of electronic spectrum shows that there is an obvious intramolecular charge transfer from oxygen to metal. The solvent effects were also considered in the calculations by using a conductor-like screening model (COSMO) of solvation with the solvent-excluding surface.

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“…Literature suggests that the blackening is due to transformation of [PW 12 O 40 ] 3− (phosphotungstic acid) to [PW 12 O 40 ] 4− (phosphotungstous acid) which is black in colour. 28 Other than the charge/discharge behaviour, the i-V curve and the power density were also obtained for 0.10 M PTA 3− . This has been depicted in Fig.…”

Section: Cv-expmentioning

confidence: 91%

Iron-Tungsten Redox Flow Battery

Anwar¹,

Sarkar²

2021

J. Electrochem. Soc.

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A redox flow battery based on phosphotungstic acid as anolyte and ferrous sulphate as catholyte has been investigated. The configuration allows for higher capacity due to the presence of multiple oxidation states of the phosphotungstate ion. The reactions at both electrodes have been found to be kinetically facile with high Coulombic efficiency. Along with basic electrochemical investigation of the two redox couples by means of cyclic voltammetry and polarization experiments using rotating disc electrodes, simulation of the cyclic voltammograms was also performed to determine the kinetic parameters and the diffusion coefficients specially for the phosphotungstate anions. In addition, a flow cell of 6.25 cm2 active area was constructed and assembled in house using a normal single cell fuel cell setup and then charge/discharge and i–V polarization studies were performed. The maximum discharge current of 160 mA cm−2 and maximum power density of 49.43 mW cm−2 were obtained from the i–V polarization curve. Meanwhile, an average Coulombic efficiency of 90.94% and maximum specific capacity of 620 mAh l−1 at 50 mA cm−2 was realized from the charge/discharge experiments.

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Experimental Photographic Systems Based on Phosphotungstic Acid

Cited by 12 publications

References 3 publications

Photo- and Electrochromism of Polyoxometalates and Related Materials

Photo- and Electrochromism of Polyoxometalates and Related Materials

Theoretical studies on redox properties, protonation sites, and electronic spectrum of a new type of polyoxometalate [Ti₁₂Nb₆O₄₄]¹⁰⁻ by DFT

Iron-Tungsten Redox Flow Battery

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Experimental Photographic Systems Based on Phosphotungstic Acid

Cited by 12 publications

References 3 publications

Photo- and Electrochromism of Polyoxometalates and Related Materials

Photo- and Electrochromism of Polyoxometalates and Related Materials

Theoretical studies on redox properties, protonation sites, and electronic spectrum of a new type of polyoxometalate [Ti12Nb6O44]10− by DFT

Iron-Tungsten Redox Flow Battery

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Theoretical studies on redox properties, protonation sites, and electronic spectrum of a new type of polyoxometalate [Ti₁₂Nb₆O₄₄]¹⁰⁻ by DFT