Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 843, Issue -, Pages 1-11Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2019.04.069
Keywords
alpha-Fe2O3; Photocatalyst; Water splitting; Ionic liquid; Graphene oxide; Oxygen evolution
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Funding
- Research Affairs Division at Amirkabir University of Technology (AUT), Tehran [1235/40]
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RGO-alpha-Fe2O3/beta-FeOOH ternary heterostructure composite has been developed as an active photocatalyst for photoelectrochemical water splitting. RGO-alpha-Fe2O3/beta-FeOOH has been successfully synthesized through one-pot hydrothermal-ionic liquid assisted route using tetrabutyl ammonium L-methioninate [TBA][L-Met] and graphene oxide (GO). The electrochemical studies were carried out to demonstrate the oxygen evolution reaction (OER) and photocatalytic activities. The overpotential reduction by rGO-alpha-Fe2O3/beta-FeOOH sample was higher than the nanobean alpha-Fe2O3/beta-FeOOH and pristine alpha-Fe2O3 samples. The photocurrent density enhanced for rGO-alpha-Fe2O3/beta-FeOOH urchin-like structure and obtained as 0.62 mA.cm(-2). The data evidences the idea that the beta-FeOOH layer in the modified morphology acts as an electron donor and the donor density increased substantially. Results from this study indicate that the rGO-alpha-Fe2O3/beta-FeOOH can improve OER performance significantly with a peak shift of 0.13 V in the potential window, revealing its excellent potential as a higher rate and lower energy needed candidate.
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