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Characterization of Nano‐Titania Modified CdS /Polysulfide Electrolyte Interface by Utilizing MottSchottky and Electrochemical Impedance Spectroscopy
Author(s) -
Pareek Alka,
Paik Pradip,
Borse Pramod H.
Publication year - 2014
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201400241
Subject(s) - dielectric spectroscopy , materials science , electrolyte , photocurrent , electrochemistry , electrode , semiconductor , spectroscopy , nanoparticle , band gap , optoelectronics , chemical engineering , analytical chemistry (journal) , nanotechnology , chemistry , engineering , physics , quantum mechanics , chromatography
Photoelectrochemical (PEC) H 2 generation is a green energy solution to upcoming energy crises. We have modified photo‐unstable CdS thin film with TiO 2 ‐nanoparticles. Semiconductor electrolyte interface (SEI) of modified CdS surface using MottSchottky (MS) analysis is used to evaluate the relative band edge positions and flat‐band potential (V FB ). Effect of applied AC‐frequency, electrolyte pH and electrode surface modification, on V FB and carrier‐concentration is studied. Modified photoanode shows high photocurrent and stability, than bare CdS photoanode. Improved performance of modified photoanode is attributed to the higher recombination lifetime of the charge carrier as deduced by electrochemical impedance spectroscopy.