Highly Conductive Off-Stoichiometric Zirconium Oxide Nanofibers with Controllable Crystalline Structures and Bandgaps and Improved Electrochemical Activities
- Authors
- Lee, Na-Won; Yoon, Ki Ro; Lee, Jae-Yun; Park, Yoonsu; Pyo, Seong-Ji; Kim, Ga-Yoon; Ha, Don-Hyung; Ryu, 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
- Pages
- 10
- Journal Title
- ACS APPLIED ENERGY MATERIALS
- Volume
- 2
- Number
- 5
- Start Page
- 3513
- End Page
- 3522
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/32792
- 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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