Pseudocapacitive Charge Storage in Electrochromic Transition-Metal Oxide Thin Films

Dongmei Dong; Tinsley Elizabeth Benhaddouch; Christopher Lloyd Metler; John Marcial; Yaoli Zhao; Vagheeswari Venkadesh; Thomas Thundat; Shekhar Bhansali

doi:10.1149/1945-7111/ac86a5

Pseudocapacitive Charge Storage in Electrochromic Transition-Metal Oxide Thin Films

Dongmei Dong, Tinsley Elizabeth Benhaddouch, Christopher Lloyd Metler, John Marcial, Yaoli Zhao, Vagheeswari Venkadesh, Thomas Thundat, Shekhar Bhansali

Research output: Contribution to journal › Article › peer-review

Abstract

Electrochromic pseudocapacitive transition-metal oxide materials, such as tungsten oxide, which combine fast response, high energy density, and optical effects, can play a significant role as energy storage materials. Here we investigate the electrochemical kinetics of thin films of tungsten oxide, which turn transparent to sky-blue color in the lithiated state due to the reduction of W⁶⁺ to W⁵⁺. We investigated the charge density, charge transfer, ion diffusion, and interfacial behavior upon Li⁺ insertion/de-insertion in WO₃. The electrochromic thin film’s pseudocapacitive and electrical double layer mechanism was differentiated based on the power-law. Faradaic diffusion-controlled process dominates over the surface capacitive behavior at scan rates below 40 mV s⁻¹. These films exhibit an areal charge density of around 100 mC cm⁻² and a capacitance of 80 mF cm⁻², superior to most comparable electrochromic materials and supercapacitors.

Original language	American English
Article number	080511
Journal	Journal of the Electrochemical Society
Volume	169
Issue number	8
DOIs	https://doi.org/10.1149/1945-7111/ac86a5
State	Published - Aug 2022
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Condensed Matter Physics
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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title = "Pseudocapacitive Charge Storage in Electrochromic Transition-Metal Oxide Thin Films",

abstract = "Electrochromic pseudocapacitive transition-metal oxide materials, such as tungsten oxide, which combine fast response, high energy density, and optical effects, can play a significant role as energy storage materials. Here we investigate the electrochemical kinetics of thin films of tungsten oxide, which turn transparent to sky-blue color in the lithiated state due to the reduction of W6+ to W5+. We investigated the charge density, charge transfer, ion diffusion, and interfacial behavior upon Li+ insertion/de-insertion in WO3. The electrochromic thin film{\textquoteright}s pseudocapacitive and electrical double layer mechanism was differentiated based on the power-law. Faradaic diffusion-controlled process dominates over the surface capacitive behavior at scan rates below 40 mV s−1. These films exhibit an areal charge density of around 100 mC cm−2 and a capacitance of 80 mF cm−2, superior to most comparable electrochromic materials and supercapacitors.",

author = "Dongmei Dong and Benhaddouch, {Tinsley Elizabeth} and Metler, {Christopher Lloyd} and John Marcial and Yaoli Zhao and Vagheeswari Venkadesh and Thomas Thundat and Shekhar Bhansali",

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doi = "10.1149/1945-7111/ac86a5",

language = "American English",

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AU - Dong, Dongmei

AU - Benhaddouch, Tinsley Elizabeth

AU - Metler, Christopher Lloyd

AU - Marcial, John

AU - Zhao, Yaoli

AU - Venkadesh, Vagheeswari

AU - Thundat, Thomas

AU - Bhansali, Shekhar

PY - 2022/8

Y1 - 2022/8

N2 - Electrochromic pseudocapacitive transition-metal oxide materials, such as tungsten oxide, which combine fast response, high energy density, and optical effects, can play a significant role as energy storage materials. Here we investigate the electrochemical kinetics of thin films of tungsten oxide, which turn transparent to sky-blue color in the lithiated state due to the reduction of W6+ to W5+. We investigated the charge density, charge transfer, ion diffusion, and interfacial behavior upon Li+ insertion/de-insertion in WO3. The electrochromic thin film’s pseudocapacitive and electrical double layer mechanism was differentiated based on the power-law. Faradaic diffusion-controlled process dominates over the surface capacitive behavior at scan rates below 40 mV s−1. These films exhibit an areal charge density of around 100 mC cm−2 and a capacitance of 80 mF cm−2, superior to most comparable electrochromic materials and supercapacitors.

AB - Electrochromic pseudocapacitive transition-metal oxide materials, such as tungsten oxide, which combine fast response, high energy density, and optical effects, can play a significant role as energy storage materials. Here we investigate the electrochemical kinetics of thin films of tungsten oxide, which turn transparent to sky-blue color in the lithiated state due to the reduction of W6+ to W5+. We investigated the charge density, charge transfer, ion diffusion, and interfacial behavior upon Li+ insertion/de-insertion in WO3. The electrochromic thin film’s pseudocapacitive and electrical double layer mechanism was differentiated based on the power-law. Faradaic diffusion-controlled process dominates over the surface capacitive behavior at scan rates below 40 mV s−1. These films exhibit an areal charge density of around 100 mC cm−2 and a capacitance of 80 mF cm−2, superior to most comparable electrochromic materials and supercapacitors.

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M1 - 080511

ER -

Pseudocapacitive Charge Storage in Electrochromic Transition-Metal Oxide Thin Films

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