Affordable Access

deepdyve-link
Publisher Website

A new hematite photoanode doping strategy for solar water splitting: oxygen vacancy generation.

Authors
  • Yang, Tae-Youl
  • Kang, Ho-Young
  • Sim, Uk
  • Lee, Young-Joo
  • Lee, Ji-Hoon
  • Koo, Byungjin
  • Nam, Ki Tae
  • Joo, Young-Chang
Type
Published Article
Journal
Physical Chemistry Chemical Physics
Publisher
The Royal Society of Chemistry
Publication Date
Feb 14, 2013
Volume
15
Issue
6
Pages
2117–2124
Identifiers
DOI: 10.1039/c2cp44352j
PMID: 23288103
Source
Medline
License
Unknown

Abstract

The enhancement of the electrical conductivity by doping is important in hematite (α-Fe(2)O(3)) photoanodes for efficient solar water oxidation. However, in spite of many successful demonstrations using extrinsic dopants, such as Sn, Ti, and Si, the achieved photocurrent is still lower than the practical requirement. There is still lack of our understanding of how intrinsic oxygen defects can change the photocurrent and interact with the extrinsic dopants. In this study, we systematically investigate the interplay of oxygen vacancies and extrinsic Sn dopants in the context of photoanodic properties. As a result, we demonstrate that the controlled generation of oxygen vacancies can activate the photoactivity of pure hematite remarkably and further enhance the Sn doping effects synergistically. Furthermore, the correlated behavior of oxygen vacancies and Sn dopants is closely linked to the variation of electrical conductance and results in the optimum concentration region to show the high photocurrent and low onset voltage.

Report this publication

Statistics

Seen <100 times