NDLI: Bifunctional TiO2 underlayer for α-Fe2O3 nanorod based photoelectrochemical cells: enhanced interface and Ti4+ doping

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Inside back cover

Back cover

Journal of Materials Chemistry A Vol - 3 Issue - 8

Journal of Materials Chemistry A Vol - 3 Issue - 7

Journal of Materials Chemistry A Vol - 3 Issue - 6

Journal of Materials Chemistry A Vol - 3 Issue - 5

Journal of Materials Chemistry A Vol -2

Journal of Materials Chemistry A Vol -1

Bifunctional TiO₂ underlayer for α-Fe₂O₃ nanorod based photoelectrochemical cells: enhanced interface and Ti⁴⁺ doping

Content Provider	Royal Society of Chemistry (RSC)
Author	Choi, Sun Hee Kim, Jin Hyun Lee, Jae Sung Subramanian, Arunprabaharan Jang, Jum Suk Annamalai, Alagappan Shinde, Pravin S. Kim, Jae Young
Copyright Year	2015
Abstract	A thin, compact TiO2 underlayer for hematite-based photoelectrochemical cells was prepared by simple spin coating and showed a dramatic increase in device performance and photocurrent density. The introduction of TiO2 underlayers induced a noticeable change in the nanostructure. In contrast to the conventional strategies based on underlayers, the compact TiO2 underlayers can act as both a charge recombination barrier and also as a source for titanium dopants. One could simply take advantage of fortuitous doping of Sn from FTO into hematite lattice during the activation step, and is converted into intentional doping of Ti4+ from the TiO2 underlayer into the hematite lattice. Ti4+ doping in hematite lattice is highly probable during the sintering of FTO/TiO2/α-Fe2O3 photoanodes at 800 °C, which has been confirmed by XPS measurements. Based on electrochemical studies, it is evident that the TiO2 underlayer effectively suppresses charge recombination at the FTO/α-Fe2O3 interface and provides possible Ti4+ doping apart from Sn diffusion from FTO substrates when sintered at high temperature (800 °C). In contrast, only charge recombination was suppressed at lower sintering temperature (550 °C). This is the first report on the elemental doping of Ti4+ from the TiO2 underlayer when sintered at high temperature.
Starting Page	5007
Ending Page	5013
Page Count	7
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	9
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta06315e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	FTO Photoelectrochemical cell Spin coating Photocurrent Nanostructure Carrier generation and recombination Titanium Dopant Hematite Crystal structure Sintering Electrochemistry Diffusion
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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Facile post-growth doping of nanostructured hematite photoanodes for enhanced photoelectrochemical water oxidation

Systematic comparison of different dopants in thin film hematite (α-Fe₂O₃) photoanodes for solar water splitting

Charge carrier trapping, recombination and transfer in hematite (α-Fe₂O₃) water splitting photoanodes

Bifunctional TiO 2 Underlayer for α – Fe 2 O 3 Nanorod based Photoelectrochemical Cells : Enhanced Interface and Ti 4 + Doping

Photoelectrochemical Detection of Calcium Ions Based on Hematite Nanorod Sensors.

Probing the photoelectrochemical properties of hematite (α-Fe₂O₃) electrodes using hydrogen peroxide as a hole scavenger

Effect of bulk doping and surface-trapped states on water splitting with hematite photoanodes

Doping of TiO₂ as a tool to optimize the water splitting efficiencies of titania–hematite photoanodes

Effects of Film Thickness and Coating Techniques on the Photoelectrochemical Behaviour of Hematite Thin Films

Bifunctional TiO₂ underlayer for α-Fe₂O₃ nanorod based photoelectrochemical cells: enhanced interface and Ti⁴⁺ doping

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