Photoelectrochemistry of n-type bismuth oxyiodide

Kwolek, Przemysław; Szaciłowski, Konrad

doi:10.1016/j.electacta.2012.10.001

Cited by 63 publications

(42 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It depends on the pH and decreases with the increasing pH with 59 mV per pH unit [21]. Therefore, at the pH equal to 1, the flat band potential is higher and equals to −0.114 ± 0.01 V. Taking into account the kT/e correction for 298 K gives −0.140 ± 0.01 V. Detailed description of the applied procedure is given in our previous work [18].…”

Section: Determination Of the Electronic Structure Of Applied Tiomentioning

confidence: 99%

“…However, due to the thermal fluctuations, structural disorder as well as the surface states, semiconductor may absorb photons slightly below the absorption edge within a so called Urbach tail region [17]. Detailed description of the applied procedure may be find in our previous work [18]. Electrochemical impedance spectroscopy (Mott-Schottky analysis) is frequently applied to determine the type of conductivity, the flatband potential and the density of donors of TiO 2 made by Ti anodization [19,20].…”

Section: Determination Of the Electronic Structure Of Applied Tiomentioning

confidence: 99%

See 1 more Smart Citation

Kinetic Study of The Photoelectrochemical Gold Recovery from Diluted Chloride Solutions

Wojnicki¹,

Tokarski²,

Kwolek³

2013

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

Au(III) was recovered from an acidic aqueous solution via a photoreduction technique under UV light irradiation. Titanium dioxide nanopowder was applied as a photocatalyst. Gold was deposited onto TiO 2 surface in the form of nanoparticles with average dimensions between 20 and 30 nm. The influence of the Au(III), TiO 2 and methanol initial concentrations on the reaction rate was determined. It was shown, that the rate of the gold photoreduction strongly depends on the concentration of TiO 2 and methanol. The recovery of gold from the diluted acidic solutions containing as much as 1.97 and 0.197 mg/dm 3 of Au(III) was also carried out. Obtained results suggest, that it is possible to recover about 45% of gold. Besides the losses during the filtration process due to the application of very fine TiO 2 particles, oxygen dissolved in the solution as well as the hydrogen ions may take part in parasitic reactions and thus decrease the Au yield.Keywords: Gold, recovery, photoreduction, TiO 2 , aqueous solutions Przeprowadzono odzysk jonów Au(III) z kwaśnych, chlorkowych roztworów wodnych metodą fotoredukcji pod wpływem światła UV. Jako fotokatalizator wykorzystano proszek dwutlenku tytanu o rozmiarach nanometrycznych. W wyniku redukcji kompleksu chlorkowego Au(III), na powierzchni TiO 2 otrzymano fazę metaliczną w formie nanocząstek o rozmiarach w zakresie od 20 do 30 nm. Zbadano wpływ stężeń początkowych Au(III), TiO 2 i metanolu. Badania wykazały, że szybkość fotoredukcji Au(III) silnie zależy od stężenia dwutlenku tytanu i metanolu. Przeprowadzono również badania nad odzyskiem złota z rozcieńczonych roztworów zawierających 1.97 i 0.197 mg/dm 3 Au(III). Otrzymane wyniki wskazują, że przyjęta metoda pozwala odzyskać około 45% złota z roztworu. Niska wydajność procesu może być spowodowana stratami w procesie filtracji związanymi z zastosowaniem nanokrystalicznego TiO 2 , tlenem rozpuszczonym w roztworze oraz jonami H + , które mogą ulegać redukcji w konkurencyjnych, równoległych reakcjach.

show abstract

Section: Determination Of the Electronic Structure Of Applied Tiomentioning

confidence: 99%

Section: Determination Of the Electronic Structure Of Applied Tiomentioning

confidence: 99%

Kinetic Study of The Photoelectrochemical Gold Recovery from Diluted Chloride Solutions

Wojnicki¹,

Tokarski²,

Kwolek³

2013

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

show abstract

“…[68] They have investigated the n-typeb ehavior of BiOI and report that it exhibits switching behavior between n-type and p-type BiOI. [68] They have investigated the n-typeb ehavior of BiOI and report that it exhibits switching behavior between n-type and p-type BiOI.…”

Section: Pec Water Splitting Of Bismuth-based Nanomaterials 21 Bismmentioning

confidence: 99%

“…Kwolek and Szaciłowski report the synthesis of BiOI by the economically benign microwave-assisted hydrothermal methodf or the first time to yield microplatelets of BiOI. [68] They have investigated the n-typeb ehavior of BiOI and report that it exhibits switching behavior between n-type and p-type BiOI. They predictt hat the cathodic nature is caused by dissolved oxygen in the electrolyte.…”

Section: Pec Water Splitting Of Bismuth-based Nanomaterials 21 Bismmentioning

confidence: 99%

Recent Advances in Bismuth‐Based Nanomaterials for Photoelectrochemical Water Splitting

2017

View full text Add to dashboard Cite

In recent years, bismuth-based nanomaterials have drawn considerable interest as potential candidates for photoelectrochemical (PEC) water splitting owing to their narrow band gaps, nontoxicity, and low costs. The unique electronic structure of bismuth-based materials with a well-dispersed valence band comprising Bi 6s and O 2p orbitals offers a suitable band gap to harvest visible light. This Review presents significant advancements in exploiting bismuth-based nanomaterials for solar water splitting. An overview of the different strategies employed and the new ideas adopted to improve the PEC performance of bismuth-based nanomaterials are discussed. Morphology control, the construction of heterojunctions, doping, and co-catalyst loading are several approaches that are implemented to improve the efficiency of solar water splitting. Key issues are identified and guidelines are suggested to rationalize the design of efficient bismuth-based materials for sunlight-driven water splitting.

show abstract

“…We can distinguish unmodified and surface-modified semiconductors. For the first group the photocurrent switching effect was observed mainly for unmodified oxide semiconductors such as bismuth orthovanadate, 30,31 BixLa1−xVO4 solid solutions (x between 0.23 and 0.93), 9 lead molybdate, 10 V-VI-VII semiconductors: bismuth oxyiodide, 7,11 bismuth oxynitrate 12 and antimony sulfoiodide 13 as well as cadmium sulphide 14,15 and lead sulphide. 16 For unmodified semiconductors, the observation of the switching effect is possible only for sufficiently low potential barrier Ebi at the solid-liquid junctionthis may be achieved by the reduction in grain sizes of the semiconductor and the decrease in the doping level, 17 TiO2 pentacyanoferrates(II), L=H2O, NH3, thiamine, thiodiethanol, thiodipropanol, thiodiacetic acid, thiodipropionic acid, thiodipropionitrile, 1,3-dithiane, 1,3-dithiolene, thiamine 23,24 TiO2 Alizarin 25,26 TiO2 dihydroxyanthraquinones 25 TiO2 alizarin complexone 27 TiO2 Ferrocene CrO4 2-, CrO3F - 32 CdS Prussian Blue 8 CdS Fullerene-oligothiophene 33 When considering the examples presented in Table 1 we may formulate some general principles that must be met in order to observe the PEPS effect.…”

Section: Semiconductors Molecules and Lightmentioning

confidence: 99%