NDLI: Nanoscale conductive niobium oxides made through low temperature phase transformation for electrocatalyst support

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Yunfeng Xing, Yangchuan Huang, Kan Yan, Litao
Copyright Year	2014
Abstract	We report an effective approach to synthesize nanoscale Nb2O5 coated on carbon nanotubes (CNTs) and transform it at low temperatures to the conductive form of NbO2. The latter, when used as a Pt electrocatalyst support, shows significant enhancement in catalyst activity and durability in the oxygen reduction reaction (ORR). Direct phase transformation of Nb2O5 to NbO2 often requires temperatures above 1000 °C. Here we show that this can be achieved at a much lower temperature (e.g. 700 °C) if the niobium oxide is first activated with carbon. Low temperature processing allows retaining nanostructures of the oxide without sintering, keeping its high surface areas needed for being a catalyst support. We further show that Pt supported on the conductive oxides on CNTs has two times higher mass activity for the ORR than on bare CNTs. The electrochemical stability of Pt was also outstanding, with only ca. 5% loss in electrochemical surface areas and insignificant reduction in half-wave potential in ORR after 5000 potential cycles.
Starting Page	9701
Ending Page	9708
Page Count	8
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	4
Issue Number	19
Journal	RSC Advances
DOI	10.1039/c3ra47091a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Carbon nanotube Sintering Niobium monoxide Redox Electrochemistry Carbon ORR Niobium pentoxide
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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