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Effect of Substrates on the Photoelectrochemical Reduction of Water over Cathodically Electrodeposited p-Type Cu2O Thin Films

IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur

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Title Effect of Substrates on the Photoelectrochemical Reduction of Water over Cathodically Electrodeposited p-Type Cu2O Thin Films
 
Creator Shyamal, S
Hajra, P
Mandal, H
Singh, J K
Satpati, A K
Pande, S
Bhattacharya, C
 
Subject Nanoscience and Nanotechnology
 
Description In this study, we demonstrate development of p-Cu2O thin films through cathodic electrodeposition technique at constant current of 0.1 mA/cm(2) on Cu, Al, and indium tin oxide (ITO) substrates from basic CuSO4 solution containing Triton X-100 as the surfactant at 30-35 degrees C. The optical and morphological characterizations of the semiconductors have been carried out using UV-vis spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy. The band gap energy of similar to 2.1 eV is recorded, whereas SEM reveals that the surface morphology is covered with Cu2O semiconductors. XRD analyses confirm that with change in substrate, the size of Cu2O "cubic" crystallites decreases from ITO to Al to Cu substrates. Photoelectrochemical characterizations under dark and illuminated conditions have been carried out through linear sweep voltammetry, chronoamperometry and electrochemical impedance spectroscopic analysis. The photoelectrochemical reduction of water (H2O -> H-2) in pH 4.9 aqueous solutions over the different substrates vary in the order of Cu > Al > ITO. The highest current of 4.6 rnA/cm(2) has been recorded over the Cu substrate even at a low illumination of 35 mW/cm(2), which is significantly higher than the values (2.4 mA/cm(2) on Au coated FTO or 4.07 mA/cm(2) on Cu foil substrate at an illumination of 100 mW/cm(2)) reported in literature.
 
Publisher American Chemical Society
 
Date 2015-08
 
Type Article
PeerReviewed
 
Relation http://pubs.acs.org/doi/10.1021/acsami.5b04116
http://eprints.nmlindia.org/7333/
 
Identifier Shyamal, S and Hajra, P and Mandal, H and Singh, J K and Satpati, A K and Pande, S and Bhattacharya, C (2015) Effect of Substrates on the Photoelectrochemical Reduction of Water over Cathodically Electrodeposited p-Type Cu2O Thin Films. ACS Applied Materials and Interfaces, 7(33) (IF-6.723). pp. 18344-18352.