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Photoelectrochemical Splitting of Water at Nanocrystalline n-Fe2O3 Thin-Film Electrodes
Abstract
Semiconducting nanocrystalline thin films of n -Fe 2 O 3 were synthesized by a spray−pyrolytic method. These films were used for the photoelectrochemical splitting of water to hydrogen and oxygen gases. The rates of photoelectrochemical splitting of water at these thin-film electrodes were found to depend on the spray time, substrate temperature, solvent composition in the spray solution, and the concentration of the spray solution. The maximum photocurrent density of 3.7 mA cm -2 at 0.7 V/saturated calomel electrode (SCE) was obtained at the n -Fe 2 O 3 film synthesized using the optimum condition of substrate temperature of 350 °C, the spray time of 60 s, and the spray solution of 0.11 M FeCl 3 in 100% ethanol. The band gap energy of this film was found 2.05 eV. The flatband potential of −0.74 V/SCE and the apparent donor density of 2.2 × 10 20 cm -3 were found from the Mott−Schottky plots at the AC frequency of 1000 Hz. The n -Fe 2 O 3 films synthesized using the optimum conditions gave rise to a total conversion efficiency of 4.92% and a practical photoconversion efficiency of 1.84% at an applied potential of 0.2 V/SCE at pH 14.
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Cited by
Carbon as catalyst and support for electrochemical energy conversion
Trogadas, P., Fuller, T. F., & Strasser, P. (2014) · Carbon · doi:10.1016/j.carbon.2014.04.005 · Cited by 522
Metadata
- Authors
- Khan, S. U. M., & Akikusa, J.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 1999-08-01
- Volume
- 103
- Issue
- 34
- Pages
- 7184-7189
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2313796063
- Cited by
- 368
- References
- 0
- FWCI
- 3.93
- Type
- journal article
- Language
- en
- Open access
- closed
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