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Electrodeposition of Silver Vanadate Films: A Tale of Two Polymorphs

Electrodeposition of Silver Vanadate Films: A Tale of Two Polymorphs

Abbas Vali, Hori P Sarker, Hyung-Woo Jee, Attila Kormányos, Farinaz Firouzan, Noseung Myung, Ki-Jung Paeng, Muhammad N Huda, Csaba Janáky, Krishnan Rajeshwar

Chemphyschem. 2019 Oct 16;20(20):2635-2646.

PMID: 31410949

Abstract:

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 our 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. 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 and the disparate optical band gaps of the two polymorphs. Finally, implications for the application of this material in solar cells are provided.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13497944	Silver metavanadate		13497-94-4	Price

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