Photocatalytic water splitting for O2 production under visible-light irradiation on BiVO4 nanoparticles in different sacrificial reagent solutions

Ke, Deping; Peng, Tianyou; Ma, Liang; Cai, Ping; Jiang, Ping

doi:10.1016/j.apcata.2008.08.003

Cited by 146 publications

(85 citation statements)

References 26 publications

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“…This indicates that the reduced Ag atoms serve as the electron traps to reduce surrounding Ag + ECS Transactions, 41 (40) 7-26 (2012) ions for nanoparticle growth. [71][72][73] This also shows that the Ag + ions cannot serve as a charging agent to improve dispersion of GO sheets and, thus, to avoid mutual photocatalytic reduction.…”

Section: Resultsmentioning

confidence: 99%

“…This indicates that the reduced Ag atoms serve as the electron traps to reduce surrounding Ag ions for nanoparticle growth. [71][72][73] This also shows that the Ag + ions cannot serve as a charging agent to improve dispersion of GO sheets and, thus, to avoid mutual photocatalytic reduction.In addition to the AgNO 3 solution, we also suspended the GO specimens in an NaIO 3 solution for O 2 evolution under mercury−lamp irradiation. The IO 3 − ions serve as a sacrificial reagent to scavenge electrons generated from light irradiation on GO according to [74][75][76] IO 3 − + 3H 2 O + 6e Figure 11 shows that the evolution of O 2 was strong from the NaIO 3 solutions containing mGO and hGO.…”

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confidence: 99%

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Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Yeh¹,

Teng²

2012

ECS Trans.

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Graphite oxide (GO) photocatalysts were derived from graphite oxidation. Absorption spectroscopy shows the increasing band gap of GO with the oxygen content. Electrochemical analysis along with the Mott-Schottky equation show that the conduction and valence band edge levels of GO from appropriate oxidation are suitable for both the reduction and oxidation of water. The photocatalytic activity of GO specimens with various oxygen contents was measured in methanol and AgNO 3 solutions for H 2 and O 2 evolution, respectively. The H 2 evolution was strong and stable over time whereas the O 2 evolution was negligibly small due to mutual photocatalytic reduction of the GO with upward shift of the valence band edge under illumination. The conduction band edge of GO showed negligibly change with the oxygen content. When NaIO 3 was used as a sacrificial reagent to suppress the mutual reduction mechanism under illumination, strong O 2 evolution was observed over the GO specimens. The present study demonstrates that chemical modification can easily modify the electronic properties of GO for specific photosynthetic applications. IntroductionHydrogen generation from water decomposition under light irradiation has received much attention.1-7 Photolysis of water using semiconducting photocatalyst powders is considered a prospective candidate because of the low cost in instrumentation and high interfacial contact area for reaction. [8][9][10][11][12][13][14][15][16][17] The essential requirements for an effective semiconducting photocatalyst are more negative conduction band edge and more positive valence band edge, to facilitate respectively reduction and oxidation of water. Additionally, the contact area between the catalyst and water should be large enough to execute photochemical reactions at sufficiently high gas-evolution rates. Most photocatalysts are metal-containing inorganic solids for H 2 and/or O 2 evolution from water. [18][19][20][21][22][23][24][25][26][27][28] High temperature calcination of these metal-containing photocatalysts is generally conducted for high crystallinity, 29 but it shrinks the contacting surface area with water. Molecule-like materials with accurate electronic band structure, high surface area, and stability are an alternative to the crystalline solid. [19][20][21]30,31 Graphite oxide (GO) is a polymer-like material made of carbon, oxygen, and hydrogen, having a large exposable surface area after being dispersed in water to molecular scale. 32 We demonstrated that GO can serve as a photocatalyst for H 2 evolution from water. 33 However, the conduction and valence band levels relative to those for water reduction and oxidation are yet to be explored.GO is derived from extensive oxidation of graphite and contains hydrophilic oxygen functional groups on constituting graphene sheets. [34][35][36][37][38][39][40] Therefore, GO easily disperses in aqueous solutions and exfoliates in the manner of wrinkled paper. The electronic properties of GO are related to the composition of oxygen bonding on grap...

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Yeh¹,

Teng²

2012

ECS Trans.

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“…Moreover, all the samples show the characteristic peak splitting diffractions at 2θ = 18.5, 35 and 46⁰ [20]. Even though monoclinic phase was observed at every calcination temperature, splitting of the these characteristics peaks becomes more pronounced as the calcination temperature increases, which is most likely a sign of the increasing crystallinity degree of the (s-m) phase in BiVO 4 samples [20], [21]. In order to calculate the electronic states of the semiconductor materials diffuse reflectance spectra (DRS) is used.…”

Section: A Characterization and Photocatalytic Activity Evaluationmentioning

confidence: 95%

Insights from Crystal Size and Band Gap on the Catalytic Activity of Monoclinic BiVO4

Thalluri¹,

Martinez-Suarez²,

Virga³

et al. 2013

IJCEA

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“…Previous work with BiVO 4 nanoparticles has shown that particles with larger dimension have decreased photocatalytic activity toward oxygen evolution associated with the distance electron-hole pairs must travel through the material. 53 When electron-hole pairs are generated in an irradiated solid, the charge carriers must move through the material and reach the surface in order to perform the desired redox reactions. If the pair is generated deep inside a large particle, the probability of the electron and hole recombining before they reach the surface is increased substantially compared to a nanostructured material.…”

Section: Scheme 1: Mechanism Of Particle Formation For Bivo 4 Powder mentioning

confidence: 99%

BiVO₄ as a Visible-Light Photocatalyst Prepared by Ultrasonic Spray Pyrolysis

2009

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BiVO 4 powders with unique particle architectures have been synthesized using ultrasonic spray pyrolysis (USP). Gases created from the evaporation of solvent and the decomposition of precursor materials shape the morphology of the particles as the solids are formed in the heated aerosol. The BiVO 4 powder was tested as oxygen evolving photocatalysts by monitoring the kinetics of O 2 formation from a AgNO 3 solution irradiated with λ > 400 nm light. USP prepared BiVO 4 was found to have significantly superior photocatalytic activity compared to commercial BiVO 4 and WO 3 , likely due to differences in particle morphology.

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Photocatalytic water splitting for O2 production under visible-light irradiation on BiVO4 nanoparticles in different sacrificial reagent solutions

Cited by 146 publications

References 26 publications

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Insights from Crystal Size and Band Gap on the Catalytic Activity of Monoclinic BiVO4

BiVO₄ as a Visible-Light Photocatalyst Prepared by Ultrasonic Spray Pyrolysis

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Photocatalytic water splitting for O2 production under visible-light irradiation on BiVO4 nanoparticles in different sacrificial reagent solutions

Cited by 146 publications

References 26 publications

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Insights from Crystal Size and Band Gap on the Catalytic Activity of Monoclinic BiVO4

BiVO4 as a Visible-Light Photocatalyst Prepared by Ultrasonic Spray Pyrolysis

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BiVO₄ as a Visible-Light Photocatalyst Prepared by Ultrasonic Spray Pyrolysis