Effect of Water/Acetonitrile Ratio on Dye-Sensitized Photocatalytic H2 Evolution under Visible Light Irradiation

H 2 production in a water-acetonitrile solution containing iodide as an electron donor was investigated over dye-sensitized Pt∕TiO2 photocatalysts under visible light irradiation, as a potential water-splitting system based on an iodide redox mediator. The rates of H2 evolution decreased with increasing proportion of water in the solutions, because of a decrease in the energy gap between the redox potential of I3−∕I− and the highest occupied molecular orbital levels of the dyes, which decreases the efficiency of electron transfer from I− to dye.

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Dye-Sensitized Photocatalyst System for Water Splitting Into H2 and O2 Under Visible Light Irradiation

Solar Energy ◽

10.1115/isec2004-65070 ◽

2004 ◽

Author(s):

Ryu Abe ◽

Kazuhiro Sayama ◽

Hironori Arakawa

Keyword(s):

Visible Light ◽

Water Splitting ◽

Visible Light Irradiation ◽

Energy Gap ◽

H2 Production ◽

Light Irradiation ◽

Mixed Solution ◽

Tio2 Photocatalysts ◽

Dye Sensitized ◽

Splitting System

H2 production from a water-acetonitrile mixed solution containing iodide electron donor was investigated over dye-sensitized Pt/TiO2 photocatalysts under visible light irradiation, as a part of water splitting system using iodide redox mediator. The rates of H2 evolution were decreased with the increase of the water ratio in the mixed solutions, because of the decrease in energy gap between the redox potential of I3−/I− and the HOMO levels of the dyes, which lowing the efficiency of electron transfer from I− to dye.

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Highly active dye-sensitized photocatalytic H2 evolution catalyzed by a single-atom Pt cocatalyst anchored onto g-C3N4 nanosheets under long-wavelength visible light irradiation

New Journal of Chemistry ◽

10.1039/c8nj02933d ◽

2018 ◽

Vol 42 (17) ◽

pp. 14083-14086 ◽

Cited By ~ 19

Author(s):

Yuan Xue ◽

Yonggang Lei ◽

Xiangyu Liu ◽

Yanan Li ◽

Wanan Deng ◽

...

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Light Irradiation ◽

Single Atom ◽

Eosin Y ◽

H2 Evolution ◽

Long Wavelength ◽

Dye Sensitized ◽

Highly Active ◽

Photocatalytic H2 Evolution

A single-atom Pt cocatalyst anchored onto g-C3N4 nanosheets could efficiently catalyze H2 evolution from an Eosin Y-sensitized system under 520 nm irradiation.

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Photosensitization of Ruthenium(II) Complex on Titania for Photocatalytic H2 Evolution Under Visible-Light Irradiation

Volume 12: Mechanics of Solids, Structures and Fluids ◽

10.1115/imece2008-69172 ◽

2008 ◽

Author(s):

Tianyou Peng ◽

Ke Dai ◽

Huabing Yi ◽

Dingning Ke ◽

Ping Cai

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Dynamic Equilibrium ◽

Irradiation Time ◽

Light Irradiation ◽

H2 Evolution ◽

Conjugation System ◽

Antenna Effect ◽

Dye Sensitized ◽

Photocatalytic H2 Evolution

Hydrogen production over dye-sensitized Pt/P25 under visible-light irradiation was investigated by using methanol or TEOA as an electron donor. The binuclear Ru(II) dye (Ru2(bpy)4L1-PF6) shows the best photosensitization in both sacrificial reagent solutions due to its larger conjugation system and “antenna effect”, which is loosely linked with TiO2 and exhibits more steady and higher increases in H2 evolution upon prolonging the irradiation time in comparison with the tightly linked N719. The dynamic equilibrium between the linkage of ground dye and divorce of oxidized dye from TiO2 can enhance the electron injection and hinder the backward transfer, and then improve the H2 evolution efficiency.

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