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Highly Conductive Off-Stoichiometric Zirconium Oxide Nanofibers with Controllable Crystalline Structures and Bandgaps and Improved Electrochemical Activities

Authors
Lee, Na-WonYoon, Ki RoLee, Jae-YunPark, YoonsuPyo, Seong-JiKim, Ga-YoonHa, Don-HyungRyu, Won-Hee
Issue Date
May-2019
Publisher
AMER CHEMICAL SOC
Keywords
electrospinning nanofiber; zirconium oxide; valve metal oxide; oxygen deficiency
Citation
ACS APPLIED ENERGY MATERIALS, v.2, no.5, pp.3513 - 3522
Journal Title
ACS APPLIED ENERGY MATERIALS
Volume
2
Number
5
Start Page
3513
End Page
3522
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/3650
DOI
10.1021/acsaem.9b00283
ISSN
2574-0962
Abstract
The structural and morphological control of durable valve metal oxides with bandgaps over 5 eV (e.g., ZrO2) paves the way for the development of bifunctional electrochemical energy devices with both good stabilities and electronic conductivities. Herein, a tailored synthesis of highly conductive off-stoichiometric ZrO2-x nanofiber materials under a controlled reducing atmosphere is reported. The bandgap and corresponding charge conductivity of ZrO2-x are simultaneously tuned (in the range of visible colors (white, brown, and black)) by generating reduced Zr3+ and oxygen vacancies. The morphological and structural evolution of the ZrO2-x nanofibers obtained under different reducing atmospheres are investigated in detail. Electrochemical kinetics in aqueous and nonaqueous media are promoted by employing a darker ZrO2-x nanofiber electrode. The functionalizing valve metal oxides with a facile charge transfer inspire an advanced design for future electrochemical and electronic devices.
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공과대학 (화공생명공학부)
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