Highly efficient and durable TiN nanofiber electrocatalyst supports

Hyun Kim, Min Kyung Cho, Jeong An Kwon, Yeon Hun Jeong, Kyung Jin Lee, Na Young Kim, Min Jung Kim, Sung Jong Yoo, Jong Hyun Jang, Hyoung Juhn Kim, SukWoo Nam, Dong Hee Lim, Eun Ae Cho, Kwan Young Lee, Jin Young Kim

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

To date, carbon-based materials including various carbon nanostructured materials have been extensively used as an electrocatalyst support for proton exchange membrane fuel cell (PEMFC) applications due to their practical nature. However, carbon dissolution or corrosion caused by high electrode potential in the presence of O2 and/or water has been identified as one of the main failure modes for the device operation. Here, we report the first TiN nanofiber (TNF)-based nonwoven structured materials to be constructed via electrospinning and subsequent two-step thermal treatment processes as a support for the PEMFC catalyst. Pt catalyst nanoparticles (NPs) deposited on the TNFs (Pt/TNFs) were electrochemically characterized with respect to oxygen reduction reaction (ORR) activity and durability in an acidic medium. From the electrochemical tests, the TNF-supported Pt catalyst was better and more stable in terms of its catalytic performance compared to a commercially available carbon-supported Pt catalyst. For example, the initial oxygen reduction performance was comparable for both cases, while the Pt/TNF showed much higher durability from an accelerated degradation test (ADT) configuration. It is understood that the improved catalytic roles of TNFs on the supported Pt NPs for ORR are due to the high electrical conductivity arising from the extended connectivity, high inertness to the electrochemical environment and strong catalyst-support interactions.

Original languageEnglish
Pages (from-to)18429-18434
Number of pages6
JournalNanoscale
Volume7
Issue number44
DOIs
Publication statusPublished - 2015 Nov 28

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Highly efficient and durable TiN nanofiber electrocatalyst supports'. Together they form a unique fingerprint.

  • Cite this

    Kim, H., Cho, M. K., Kwon, J. A., Jeong, Y. H., Lee, K. J., Kim, N. Y., Kim, M. J., Yoo, S. J., Jang, J. H., Kim, H. J., Nam, S., Lim, D. H., Cho, E. A., Lee, K. Y., & Kim, J. Y. (2015). Highly efficient and durable TiN nanofiber electrocatalyst supports. Nanoscale, 7(44), 18429-18434. https://doi.org/10.1039/c5nr04082e