Electrodeposition of Silver Vanadate Films: A Tale of Two Polymorphs.

Author(s) Rajeshwar, K.; Vali, A.; Sarker, H.; Hyung-Woo, J.; Kormanyos, A.; Firouzan, F.; Huda, M.; Csaba, J.
Journal Chemphyschem
Date Published 2019 Aug 13

Two polymorphs of AgVO3, namely the α- and β- forms, were prepared and their physical, structural, optical, electrochemical, and photoelectrochemical characteristics were compared using a battery of experimental and theoretical tools. A two-step method, previously developed in the Rajeshwar laboratory for the electrodeposition of inorganic semiconductor films, was applied to the electrosynthesis of silver vanadate (AgVO3) films on transparent, conducting oxide surfaces. In the first step, silver was cathodically-deposited from a non-aqueous bath containing silver nitrate. In the second step, the silver film was anodically-stripped in an aqueous medium containing ammonium metavanadate solution. The anodically-generated silver ions at the interface underwent a precipitation reaction with the vanadate species to generate the desired product in situ. Each of these steps were mechanistically corroborated via the use of electrochemical quartz crystal microgravimetry, used in conjunction with voltammetry and coulometry. As-deposited films were crystalline and showed p-type semiconductor behavior. Theoretical insights are provided for the electronic origin of the α → β phase transformation in AgVO3. Finally, implications for the application of this material in solar cells are provided.

DOI 10.1002/cphc.201900558
ISSN 1439-7641
Citation Rajeshwar K, Vali A, Sarker H, Hyung-Woo J, Kormanyos A, Firouzan F, et al. Electrodeposition of Silver Vanadate Films: A Tale of Two Polymorphs. Chemphyschem. 2019.

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