Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 5, Pages 3513-3522Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00283
Keywords
electrospinning nanofiber; zirconium oxide; valve metal oxide; oxygen deficiency
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1C1C1007886, 2018R1A5A1025224]
- Korea Evaluation Institute of Industrial Technology (KEIT) - Korea government (MOTIE) [10077594]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10077594] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2019R1C1C1007886] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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