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Surface Modification of α-Fe2O3 Nanorod Array Photoanodes for Improved Light-Induced Water Splitting

Published online by Cambridge University Press:  07 July 2011

Shaohua Shen
Affiliation:
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
Coleman X. Kronawitter
Affiliation:
Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA94720, USA
Jiangang Jiang
Affiliation:
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
Liejin Guo
Affiliation:
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
Samuel S. Mao
Affiliation:
Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA94720, USA
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Abstract

α-Fe2O3 nanorod arrays were fabricated by a low-temperature aqueous chemical growth (ACG) technique and followed by an annealing process. For the surface doping of α-Fe2O3 nanorods, β-FeOOH nanorods obtained via ACG were coated with a thin layer of Cr3+ precursor solution by spin coating, and then underwent the annealing treatment in air. Conducting polymer polypyrrole (PPy) decorated α-Fe2O3 nanorods were prepared by electrodeposition method using malic acid contained pyrrole aqueous solution. Primary results showed that the photocurrents of α-Fe2O3 nanorod array photoanodes were greatly enhanced by surface doping of Cr3+, as well as PPy decoration. This might be due to the retarded charge recombination and promoted surface reaction rate of photogenerated holes with water. Further investigation on surface modification of α-Fe2O3 nanorod array photoanodes is currently conducted in our group.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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References

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