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Photoelectrochemical behaviour of CuBi2O4@MoS2 photocathode for solar water splitting
K. Varunkumar,
Published in Elsevier Ltd
Volume: 261
In this work, the role of MoS2 co-catalyst on the CuBi2O4 photocathode was studied for solar water splitting. CuBi2O4 was synthesized on to the FTO substrate by a facile drop-casting technique. The presence of deposited film was confirmed by XRD and RAMAN characterizations. The estimated bandgap from the optical absorbance characterization was 1.30 eV and 1.49 eV for CuBi2O4 and CuBi2O4@MoS2, respectively. Photoelectrochemical studies showed an enhanced photocurrent of 0.182 mA/cm2 at 0.6 V vs RHE for CuBi2O4@MoS2 in comparison to bare CuBi2O4 (0.082 mA/cm2). Electrochemical impedance spectroscopy further supported that the enhanced photocurrent of CuBi2O4@MoS2 was due to small interfacial charge transfer resistance in comparison to bare CuBi2O4. The flat band potential extracted from Mott-Schottky studies was 1.18 V and 1.19 V vs RHE for CuBi2O4@MoS2 and CuBi2O4, respectively. The photocathode system can be used as a better alternative to other similar copper-based photocathode systems since p-type CuBi2O4 has high positive flat band potential. © 2021 Elsevier B.V.
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JournalData powered by TypesetMaterials Chemistry and Physics
PublisherData powered by TypesetElsevier Ltd