Pseudocapacitive Charge Storage in Electrochromic Transition-Metal Oxide Thin Films

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

doi:10.1149/1945-7111/ac86a5

Pseudocapacitive Charge Storage in Electrochromic Transition-Metal Oxide Thin Films

Journal Article · Tue Aug 16 00:00:00 EDT 2022 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/ac86a5· OSTI ID:1980894

^[1]; ^[2]; Metler, Christopher Lloyd ^[2]; Marcial, John ^[2]; ^[3]; Venkadesh, Vagheeswari ^[2]; Thundat, Thomas ^[3]; Bhansali, Shekhar ^[2]

Florida International Univ. (FIU), Miami, FL (United States); OSTI
Florida International Univ. (FIU), Miami, FL (United States)
State Univ. of New York (SUNY), Buffalo, NY (United States)

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⁺. In this study, 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. This work combines electrochromics and energy storage properties and provides a fundamental understanding of pseudocapacitive and electrochromic mechanisms in WO₃.

View Accepted Manuscript (DOE)

Research Organization:: Florida International Univ. (FIU), Miami, FL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003981

OSTI ID:: 1980894

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 8 Vol. 169; ISSN 0013-4651

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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