Suppressed photoelectrochemistry at carbon-surface-modified mesoporous TiO 2 films

Anne Vuorema; James J. Walsh; Mika Sillanpää; Wim Thielemans; Robert J. Forster; Frank Marken

doi:10.1016/j.electacta.2011.10.025

Suppressed photoelectrochemistry at carbon-surface-modified mesoporous TiO ₂ films

Anne Vuorema, James J. Walsh, Mika Sillanpää, Wim Thielemans, Robert J. Forster, Frank Marken

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Cellulose nano-whiskers or nanocrystals are used as a carbon source in a vacuum graphitisation process to surface-modify nano-TiO ₂ and influence its photoreactivity. In sharp contrast to bulk carbon-modified TiO ₂ materials, introducing cellulose in a controlled way, i.e., a layer-by-layer deposition process, allows thin film materials to be created with low graphite content, but with strongly suppressed responses to light. The effect is explained by highly effective surface recombination and demonstrated for the I ₃ ^-/I ^- redox system in acetonitrile and for the photo-oxidation of acetate in aqueous media.

Original language	English
Pages (from-to)	31-35
Number of pages	5
Journal	Electrochimica Acta
Volume	73
DOIs	https://doi.org/10.1016/j.electacta.2011.10.025
Publication status	Published - 1 Jul 2012
Externally published	Yes

Keywords

Anatase
Carbon film
Carbonization
Cellulose
Electrochemistry
Graphene
Graphite
Nano-whisker
Photocurrent
Pyrolysis
Thin films
TiO
Titania
Voltammetry

ASJC Scopus subject areas

General Chemical Engineering
Electrochemistry

Access to Document

10.1016/j.electacta.2011.10.025

Cite this

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title = "Suppressed photoelectrochemistry at carbon-surface-modified mesoporous TiO 2 films",

abstract = "Cellulose nano-whiskers or nanocrystals are used as a carbon source in a vacuum graphitisation process to surface-modify nano-TiO 2 and influence its photoreactivity. In sharp contrast to bulk carbon-modified TiO 2 materials, introducing cellulose in a controlled way, i.e., a layer-by-layer deposition process, allows thin film materials to be created with low graphite content, but with strongly suppressed responses to light. The effect is explained by highly effective surface recombination and demonstrated for the I 3 -/I - redox system in acetonitrile and for the photo-oxidation of acetate in aqueous media.",

keywords = "Anatase, Carbon film, Carbonization, Cellulose, Electrochemistry, Graphene, Graphite, Nano-whisker, Photocurrent, Pyrolysis, Thin films, TiO, Titania, Voltammetry",

author = "Anne Vuorema and Walsh, {James J.} and Mika Sillanp{\"a}{\"a} and Wim Thielemans and Forster, {Robert J.} and Frank Marken",

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AU - Vuorema, Anne

AU - Walsh, James J.

AU - Sillanpää, Mika

AU - Thielemans, Wim

AU - Forster, Robert J.

AU - Marken, Frank

PY - 2012/7/1

Y1 - 2012/7/1

N2 - Cellulose nano-whiskers or nanocrystals are used as a carbon source in a vacuum graphitisation process to surface-modify nano-TiO 2 and influence its photoreactivity. In sharp contrast to bulk carbon-modified TiO 2 materials, introducing cellulose in a controlled way, i.e., a layer-by-layer deposition process, allows thin film materials to be created with low graphite content, but with strongly suppressed responses to light. The effect is explained by highly effective surface recombination and demonstrated for the I 3 -/I - redox system in acetonitrile and for the photo-oxidation of acetate in aqueous media.

AB - Cellulose nano-whiskers or nanocrystals are used as a carbon source in a vacuum graphitisation process to surface-modify nano-TiO 2 and influence its photoreactivity. In sharp contrast to bulk carbon-modified TiO 2 materials, introducing cellulose in a controlled way, i.e., a layer-by-layer deposition process, allows thin film materials to be created with low graphite content, but with strongly suppressed responses to light. The effect is explained by highly effective surface recombination and demonstrated for the I 3 -/I - redox system in acetonitrile and for the photo-oxidation of acetate in aqueous media.

KW - Anatase

KW - Carbon film

KW - Carbonization

KW - Cellulose

KW - Electrochemistry

KW - Graphene

KW - Graphite

KW - Nano-whisker

KW - Photocurrent

KW - Pyrolysis

KW - Thin films

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KW - Titania

KW - Voltammetry

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