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Fabrication of nanostructured α-Fe2O3 films for solar-driven hydrogen generation using hybrid heating

journal contribution
posted on 19.10.2011 by Bala Vaidhyanathan, Sina Saremi-Yarahmadi, Upul Wijayantha-Kahagala-Gamage
Electrodeposited thin films of Fe were oxidised using a novel conventional/microwave hybrid heating method. The photo-performance of hematite electrodes was investigated and the results are compared with regards to the amount of microwave power applied. The findings showed significant improvement in the performance of hematite electrodes when microwave heating was used. The genuine ‘microwave effect’ observed in this case is confirmed by using hybrid heating experiments at identical time-temperature profiles. The photocurrent density obtained at 0.23 V vs. VAg/AgCl increased significantly from 7 to 126 μA.cm-2 when microwave power was raised from 0 to 300 W. The films prepared by pure conventional annealing showed high recombination and photocurrent onset of around 0.4 V vs VAg/AgCl while the onset showed a negative shift to 0.1 V vs VAg/AgCl for the hybrid samples. The results obtained from Raman spectroscopy indicated a highly defective crystalline nature for the conventionally-annealed samples while microwave-assisted annealing resulted in fewer defects in the oxygen sublattice of hematite structure. It suggests that microwave heating improves surface properties of hematite films thus enhancing the photoelectrochemical performance of the photoelectrodes. Hybrid heating was found to provide a unique opportunity to control/tailor the oxidation kinetics and in turn the photo-performance of hematite electrodes using microwave power.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Citation

VAIDHYANATHA, B., SAREMI-YARAHMADI, S. and WIJAYANTHA, K.G.U., 2011. Fabrication of nanostructured α-Fe2O3 films for solar-driven hydrogen generation using hybrid heating. IN: Widjaja, S. and Singh, D. (volume eds). Nanostructured Materials and Nanotechnology V. Wiley, pp. 11-22

Publisher

Wiley © American Ceramic Society

Version

AM (Accepted Manuscript)

Publication date

2011

Notes

This article is closed access.

ISBN

9781118059920

Book series

Ceramic Engineering and Science Proceedings;Vol. 32 Pt. 7

Language

en

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