Low-Temperature Atomic Layer Deposition Synthesis of Vanadium Sulfide (Ultra)Thin Films for Nanotubular Supercapacitors
Loading...
Date
2024-04-01
Authors
Zazpe Mendioroz, Raúl
Sepúlveda Sepúlveda, Lina Marcela
Rodriguez Pereira, Jhonatan
Hromádko, Luděk
Michalička, Jan
Kolíbalová, Eva
Kurka, Michal
Thalluri, Sitaramanjaneya Mouli
Sopha, Hanna Ingrid
Macák, Jan
0000-0001-6231-0061Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
WILEY
Altmetrics
Abstract
Herein, the synthesis of vanadium sulfide (VxSy) by atomic layer deposition (ALD) based on the use of tetrakis(dimethylamino) vanadium (IV) and hydrogen sulfide is presented for the first time. The (ultra)thin films VxSy are synthesized in a wide range of temperatures (100-225 degrees C) and extensively characterized by different methods. The chemical composition of the VxSy (ultra)thin films reveals different vanadium oxidation states and sulfur-based species. Extensive X-ray photoelectron spectroscopy analysis studies the effect of different ALD parameters on the VxSy chemical composition. Encouraged by the rich chemistry properties of vanadium-based compounds and based on the variable valences of vanadium, the electrochemical properties of ALD VxSy (ultra)thin films as electrode material for supercapacitors are further explored. Thereby, nanotubular composites are fabricated by coating TiO2 nanotube layers (TNTs) with different numbers of VxSy ALD cycles at low temperature (100 degrees C). Long-term cycling tests reveal a gradual decline of electrochemical performance due to the progressive VxSy thin films dissolution under the experimental conditions. Nevertheless, VxSy-coated TNTs exhibit significantly superior capacitance properties as compared to the blank counterparts. The enhanced capacitance properties exhibited are derived from the presence of chemically stable and electrochemically active S-based species on the TNTs surface.
Description
Citation
Small Structures. 2024, vol. 5, issue 4, 10 p.
https://onlinelibrary.wiley.com/doi/10.1002/sstr.202300512
https://onlinelibrary.wiley.com/doi/10.1002/sstr.202300512
Document type
Peer-reviewed
Document version
Published version
Date of access to the full text
Language of document
en