Oxide-Carbon Nanofibrous Composite Support for a Highly Active and Stable Polymer Electrolyte Membrane Fuel-Cell Catalyst

Yukwon Jeon, Yunseong Ji, Yong Il Cho, Chanmin Lee, Dae Hwan Park, Yong Gun Shul

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Well-designed electronic configurations and structural properties of electrocatalyst alter the activity, stability, and mass transport for enhanced catalytic reactions. We introduce a nanofibrous oxide-carbon composite by an in situ method of carbon nanofiber (CNF) growth by highly dispersed Ni nanoparticles that are exsoluted from a NiTiO3 surface. The nanofibrous feature has a 3D web structure with improved mass-transfer properties at the electrode. In addition, the design of the CNF/TiO2 support allows for complex properties for excellent stability and activity from the TiO2 oxide support and high electric conductivity through the connected CNF, respectively. Developed CNF/TiO2-Pt nanofibrous catalyst displays exemplary oxygen-reduction reaction (ORR) activity with significant improvement of the electrochemical surface area. Moreover, exceptional resistance to carbon corrosion and Pt dissolution is proven by durability-test protocols based on the Department of Energy. These results are well-reflected to the single-cell tests with even-better performance at the kinetic zone compared to the commercial Pt/C under different operation conditions. CNF/TiO2-Pt displays an enhanced active state due to the strong synergetic interactions, which decrease the Pt d-band vacancy by electron transfer from the oxide-carbon support. A distinct reaction mechanism is also proposed and eventually demonstrates a promising example of an ORR electrocatalyst design.

Original languageEnglish
Pages (from-to)6819-6829
Number of pages11
JournalACS Nano
Volume12
Issue number7
DOIs
Publication statusPublished - 2018 Jul 24

Fingerprint

Carbon nanofibers
electrocatalysts
Proton exchange membrane fuel cells (PEMFC)
Oxides
Carbon
electrolytes
membranes
Catalysts
composite materials
oxides
carbon
Composite materials
polymers
Electrocatalysts
Mass transfer
Oxygen
Vacancies
Structural properties
Dissolution
Durability

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Jeon, Yukwon ; Ji, Yunseong ; Cho, Yong Il ; Lee, Chanmin ; Park, Dae Hwan ; Shul, Yong Gun. / Oxide-Carbon Nanofibrous Composite Support for a Highly Active and Stable Polymer Electrolyte Membrane Fuel-Cell Catalyst. In: ACS Nano. 2018 ; Vol. 12, No. 7. pp. 6819-6829.
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Oxide-Carbon Nanofibrous Composite Support for a Highly Active and Stable Polymer Electrolyte Membrane Fuel-Cell Catalyst. / Jeon, Yukwon; Ji, Yunseong; Cho, Yong Il; Lee, Chanmin; Park, Dae Hwan; Shul, Yong Gun.

In: ACS Nano, Vol. 12, No. 7, 24.07.2018, p. 6819-6829.

Research output: Contribution to journalArticle

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