Tuning the Porous Structure in PMMA-Templated Mesoporous MoO 2 for Pseudocapacitive Li-Ion Electrodes

Yan, Yan; Chin, Matthew A.; Robertson, Daniel D.; Lesel, Benjamin K.; Tolbert, Sarah H.

doi:10.1149/1945-7111/ac63f8

Tuning the Porous Structure in PMMA-Templated Mesoporous MoO ₂ for Pseudocapacitive Li-Ion Electrodes

Journal Article · Mon Apr 25 00:00:00 EDT 2022 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/ac63f8· OSTI ID:2325236

Yan, Yan; Chin, Matthew A.; Robertson, Daniel D.; Lesel, Benjamin K.;

MoO ₂ is an exciting candidate for next-generation energy storage. It can be used for fast-charging applications in nanoscale form, but its kinetic performance is often limited by insulating MoO ₃ surface oxide layers. Here, we developed methods to produce polymer-templated porous MoO ₂ powders where electrical conductivity was well-maintained throughout the structure, even in the presence of some surface oxidation. Porosity, pore size, and crystallite size were controlled by varying the amount and size of the colloidal templates and through calcination temperature. The electrochemical performance was correlated with nanoscale structure: samples with high porosity, medium pore sizes, and good crystallinity display optimal rate capabilities, with over 100 mAh g ⁻¹ delivered in 3 min and 93% capacity retention after 1000 cycles. Kinetic studies were performed on samples with the largest and smallest crystallite sizes to understand the charge storage mechanism. In the sample with the smallest crystallite size, 85% of the total stored charge was capacitive, compared to 60% for the largest crystallite size. Sloping voltage profiles in materials with smaller domain sizes further suggest suppression of intercalation-induced phase transitions. This work thus provides insights into the mechanisms of charge storage in nanoscale MoO ₂ and design parameters for the production of fast charging materials.

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Research Organization:: University of California, Los Angeles, CA (United States)

Sponsoring Organization:: National Science Foundation Graduate Research Fellowship; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014213

OSTI ID:: 2325236

Alternate ID(s):: OSTI ID: 1860978
OSTI ID: 1980877

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 169; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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