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Title: Oxygen vacancies enhance pseudocapacitive charge storage properties of MoO3-x

Abstract

The short charging times and high power capabilities associated with capacitive energy storage make this approach an attractive alternative to batteries. One limitation of electrochemical capacitors is their low energy density and for this reason, there is widespread interest in pseudocapacitive materials that use Faradaic reactions to store charge. One candidate pseudocapacitive material is orthorhombic MoO3 (α-MoO3), a layered compound with a high theoretical capacity for lithium (279 mA h g-1 or 1,005 C g-1). Here, we report on the properties of reduced α-MoO3-x(R-MoO3-x) and compare it with fully oxidized α-MoO3 (F-MoO3). The introduction of oxygen vacancies leads to a larger interlayer spacing that promotes faster charge storage kinetics and enables the α-MoO3 structure to be retained during the insertion and removal of Li ions. The higher specific capacity of the R-MoO3-x is attributed to the reversible formation of a significant amount of Mo4+ following lithiation. This study underscores the potential importance of incorporating oxygen vacancies into transition metal oxides as a strategy for increasing the charge storage kinetics of redox-active materials.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Molecularly Engineered Energy Materials (MEEM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1397208
DOE Contract Number:  
SC0001342
Resource Type:
Journal Article
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 16; Journal Issue: 4; Related Information: MEEM partners with University of California, Los Angeles (lead); University of California, Berkeley; Eastern Washington University; University of Kansas; National Renewable Energy Laboratory; Journal ID: ISSN 1476-1122
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Kim, Hyung-Seok, Cook, John B., Lin, Hao, Ko, Jesse S., Tolbert, Sarah H., Ozolins, Vidvuds, and Dunn, Bruce. Oxygen vacancies enhance pseudocapacitive charge storage properties of MoO3-x. United States: N. p., 2016. Web. doi:10.1038/nmat4810.
Kim, Hyung-Seok, Cook, John B., Lin, Hao, Ko, Jesse S., Tolbert, Sarah H., Ozolins, Vidvuds, & Dunn, Bruce. Oxygen vacancies enhance pseudocapacitive charge storage properties of MoO3-x. United States. doi:10.1038/nmat4810.
Kim, Hyung-Seok, Cook, John B., Lin, Hao, Ko, Jesse S., Tolbert, Sarah H., Ozolins, Vidvuds, and Dunn, Bruce. Mon . "Oxygen vacancies enhance pseudocapacitive charge storage properties of MoO3-x". United States. doi:10.1038/nmat4810.
@article{osti_1397208,
title = {Oxygen vacancies enhance pseudocapacitive charge storage properties of MoO3-x},
author = {Kim, Hyung-Seok and Cook, John B. and Lin, Hao and Ko, Jesse S. and Tolbert, Sarah H. and Ozolins, Vidvuds and Dunn, Bruce},
abstractNote = {The short charging times and high power capabilities associated with capacitive energy storage make this approach an attractive alternative to batteries. One limitation of electrochemical capacitors is their low energy density and for this reason, there is widespread interest in pseudocapacitive materials that use Faradaic reactions to store charge. One candidate pseudocapacitive material is orthorhombic MoO3 (α-MoO3), a layered compound with a high theoretical capacity for lithium (279 mA h g-1 or 1,005 C g-1). Here, we report on the properties of reduced α-MoO3-x(R-MoO3-x) and compare it with fully oxidized α-MoO3 (F-MoO3). The introduction of oxygen vacancies leads to a larger interlayer spacing that promotes faster charge storage kinetics and enables the α-MoO3 structure to be retained during the insertion and removal of Li ions. The higher specific capacity of the R-MoO3-x is attributed to the reversible formation of a significant amount of Mo4+ following lithiation. This study underscores the potential importance of incorporating oxygen vacancies into transition metal oxides as a strategy for increasing the charge storage kinetics of redox-active materials.},
doi = {10.1038/nmat4810},
journal = {Nature Materials},
issn = {1476-1122},
number = 4,
volume = 16,
place = {United States},
year = {2016},
month = {12}
}

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