Photocatalytic hydrogen evolution from Hexaniobate nanoscrolls and calcium niobate nanosheets sensitized by ruthenium(II) bipyridyl complexes

Kazuhiko Maeda, Miharu Eguchi, Seung Hyun Anna Lee, W. Justin Youngblood, Hideo Hata, Thomas E. Mallouk

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

Hexaniobate nanoscrolls (NS-H 4Nb 6O 17) and acid-restacked calcium niobate nanosheets (R-HCa 2Nb 3O 10) were compared as oxide semiconductors in photocatalytic assemblies for H 2 production using ethylenediaminetetraacetic acid (EDTA) as a sacrificial electron donor and platinum (Pt) nanoparticles as catalysts. Ru(bpy) 3 2+ and Ru(bpy) 2(4,4'- (PO 3H 2) 2bpy) 2+ (bpy = 2,2'-bipyridine) were employed as visible light sensitizers (abbreviated as Ru 2+ and RuP 2+, respectively). RuP 2+, which is anchored by a covalent linkage to the NS- H 4aNb 6O 17 surface, functions more efficiently than the electrostatically bound Ru 2+ complex, because of more efficient electron injection from the excited sensitizer to NS-H 4Nb 6O 17. RuP 2+-sensitized NS-H 4Nb 6O 17 and R-HCa 2Nb 3O 10 both produce H 2 photocatalytically using visible light (λ > 420 nm) with initial apparent quantum yields of 20-25%. At the optimum sensitizer concentration and Pt loading, the photochemical hydrogen evolution process is primarily limited by the efficiency of light absorption and charge injection from the photoexcited sensitizer into the oxide semiconductor particles. The dependence of the hydrogen evolution rate on Pt loading suggests that the scavenging of conduction band electrons by Pt is substantially faster than charge recombination or EDTA reduction of the oxidized sensitizer under optimized conditions.

Original languageEnglish (US)
Pages (from-to)7962-7969
Number of pages8
JournalJournal of Physical Chemistry C
Volume113
Issue number18
DOIs
StatePublished - May 7 2009

Fingerprint

2,2'-Dipyridyl
Ruthenium
Nanosheets
niobates
Platinum
ruthenium
calcium
Hydrogen
Calcium
platinum
ethylenediaminetetraacetic acids
Ethylenediaminetetraacetic acid
hydrogen
Edetic Acid
injection
Charge injection
Electron injection
electrons
oxides
Electrons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Maeda, Kazuhiko ; Eguchi, Miharu ; Lee, Seung Hyun Anna ; Youngblood, W. Justin ; Hata, Hideo ; Mallouk, Thomas E. / Photocatalytic hydrogen evolution from Hexaniobate nanoscrolls and calcium niobate nanosheets sensitized by ruthenium(II) bipyridyl complexes. In: Journal of Physical Chemistry C. 2009 ; Vol. 113, No. 18. pp. 7962-7969.
@article{d4c16f773ca54e1696fe71b935212486,
title = "Photocatalytic hydrogen evolution from Hexaniobate nanoscrolls and calcium niobate nanosheets sensitized by ruthenium(II) bipyridyl complexes",
abstract = "Hexaniobate nanoscrolls (NS-H 4Nb 6O 17) and acid-restacked calcium niobate nanosheets (R-HCa 2Nb 3O 10) were compared as oxide semiconductors in photocatalytic assemblies for H 2 production using ethylenediaminetetraacetic acid (EDTA) as a sacrificial electron donor and platinum (Pt) nanoparticles as catalysts. Ru(bpy) 3 2+ and Ru(bpy) 2(4,4'- (PO 3H 2) 2bpy) 2+ (bpy = 2,2'-bipyridine) were employed as visible light sensitizers (abbreviated as Ru 2+ and RuP 2+, respectively). RuP 2+, which is anchored by a covalent linkage to the NS- H 4aNb 6O 17 surface, functions more efficiently than the electrostatically bound Ru 2+ complex, because of more efficient electron injection from the excited sensitizer to NS-H 4Nb 6O 17. RuP 2+-sensitized NS-H 4Nb 6O 17 and R-HCa 2Nb 3O 10 both produce H 2 photocatalytically using visible light (λ > 420 nm) with initial apparent quantum yields of 20-25{\%}. At the optimum sensitizer concentration and Pt loading, the photochemical hydrogen evolution process is primarily limited by the efficiency of light absorption and charge injection from the photoexcited sensitizer into the oxide semiconductor particles. The dependence of the hydrogen evolution rate on Pt loading suggests that the scavenging of conduction band electrons by Pt is substantially faster than charge recombination or EDTA reduction of the oxidized sensitizer under optimized conditions.",
author = "Kazuhiko Maeda and Miharu Eguchi and Lee, {Seung Hyun Anna} and Youngblood, {W. Justin} and Hideo Hata and Mallouk, {Thomas E.}",
year = "2009",
month = "5",
day = "7",
doi = "10.1021/jp900842e",
language = "English (US)",
volume = "113",
pages = "7962--7969",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "18",

}

Photocatalytic hydrogen evolution from Hexaniobate nanoscrolls and calcium niobate nanosheets sensitized by ruthenium(II) bipyridyl complexes. / Maeda, Kazuhiko; Eguchi, Miharu; Lee, Seung Hyun Anna; Youngblood, W. Justin; Hata, Hideo; Mallouk, Thomas E.

In: Journal of Physical Chemistry C, Vol. 113, No. 18, 07.05.2009, p. 7962-7969.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Photocatalytic hydrogen evolution from Hexaniobate nanoscrolls and calcium niobate nanosheets sensitized by ruthenium(II) bipyridyl complexes

AU - Maeda, Kazuhiko

AU - Eguchi, Miharu

AU - Lee, Seung Hyun Anna

AU - Youngblood, W. Justin

AU - Hata, Hideo

AU - Mallouk, Thomas E.

PY - 2009/5/7

Y1 - 2009/5/7

N2 - Hexaniobate nanoscrolls (NS-H 4Nb 6O 17) and acid-restacked calcium niobate nanosheets (R-HCa 2Nb 3O 10) were compared as oxide semiconductors in photocatalytic assemblies for H 2 production using ethylenediaminetetraacetic acid (EDTA) as a sacrificial electron donor and platinum (Pt) nanoparticles as catalysts. Ru(bpy) 3 2+ and Ru(bpy) 2(4,4'- (PO 3H 2) 2bpy) 2+ (bpy = 2,2'-bipyridine) were employed as visible light sensitizers (abbreviated as Ru 2+ and RuP 2+, respectively). RuP 2+, which is anchored by a covalent linkage to the NS- H 4aNb 6O 17 surface, functions more efficiently than the electrostatically bound Ru 2+ complex, because of more efficient electron injection from the excited sensitizer to NS-H 4Nb 6O 17. RuP 2+-sensitized NS-H 4Nb 6O 17 and R-HCa 2Nb 3O 10 both produce H 2 photocatalytically using visible light (λ > 420 nm) with initial apparent quantum yields of 20-25%. At the optimum sensitizer concentration and Pt loading, the photochemical hydrogen evolution process is primarily limited by the efficiency of light absorption and charge injection from the photoexcited sensitizer into the oxide semiconductor particles. The dependence of the hydrogen evolution rate on Pt loading suggests that the scavenging of conduction band electrons by Pt is substantially faster than charge recombination or EDTA reduction of the oxidized sensitizer under optimized conditions.

AB - Hexaniobate nanoscrolls (NS-H 4Nb 6O 17) and acid-restacked calcium niobate nanosheets (R-HCa 2Nb 3O 10) were compared as oxide semiconductors in photocatalytic assemblies for H 2 production using ethylenediaminetetraacetic acid (EDTA) as a sacrificial electron donor and platinum (Pt) nanoparticles as catalysts. Ru(bpy) 3 2+ and Ru(bpy) 2(4,4'- (PO 3H 2) 2bpy) 2+ (bpy = 2,2'-bipyridine) were employed as visible light sensitizers (abbreviated as Ru 2+ and RuP 2+, respectively). RuP 2+, which is anchored by a covalent linkage to the NS- H 4aNb 6O 17 surface, functions more efficiently than the electrostatically bound Ru 2+ complex, because of more efficient electron injection from the excited sensitizer to NS-H 4Nb 6O 17. RuP 2+-sensitized NS-H 4Nb 6O 17 and R-HCa 2Nb 3O 10 both produce H 2 photocatalytically using visible light (λ > 420 nm) with initial apparent quantum yields of 20-25%. At the optimum sensitizer concentration and Pt loading, the photochemical hydrogen evolution process is primarily limited by the efficiency of light absorption and charge injection from the photoexcited sensitizer into the oxide semiconductor particles. The dependence of the hydrogen evolution rate on Pt loading suggests that the scavenging of conduction band electrons by Pt is substantially faster than charge recombination or EDTA reduction of the oxidized sensitizer under optimized conditions.

UR - http://www.scopus.com/inward/record.url?scp=65549127879&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=65549127879&partnerID=8YFLogxK

U2 - 10.1021/jp900842e

DO - 10.1021/jp900842e

M3 - Article

AN - SCOPUS:65549127879

VL - 113

SP - 7962

EP - 7969

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 18

ER -