N-doped carbon nanofibers as oxygen reduction and hydrogen peroxide decomposition catalysts

Stephen Maldonado, Keith J. Stevenson

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

In this study, the synthesis carbon nanofiber (CNF) electrodes produced by chemical vapor deposition (CVD) is presented. These materials were characterized as catalysts for decomposition of hydrogen peroxide and for electro-reduction of dioxygen. Careful regulation of the CVD deposition parameters allows for controlled growth of nitrogen doped carbon nanofibers (N-doped CNFs) which exhibit enhanced catalytic activity over non-doped CNF electrodes. Electrochemical and gasometric methods are used to establish corresponding catalysis mechanisms and to quantify heterogeneous decomposition rate constants for hydrogen peroxide. The N-doped electrodes demonstrate significant electrocatalytic activity in aqueous KNO 3 solutions at neutral to basic pH for the reduction of oxygen. Electrochemical data is presented which suggest that oxygen reduction reaction can be treated as a catalytic regenerative process where HO 2 - is chemically decomposed to regenerate oxygen, 2HO 2 ⇋ O 2 + 2OH: The proposed electrocatalysis mechanism for dioxygen reduction is supported by the observed decomposition rate constants for hydrogen peroxide. Remarkably, ∼100 fold enhancement for hydrogen peroxide decomposition is observed for N-doped CNFs, with rates comparable to the best known peroxide decomposition catalysts.

Original languageEnglish
Title of host publicationElectron Transfer in Nanomaterials - Proceedings of the International Symposium
Pages421-430
Number of pages10
Publication statusPublished - 2006
Externally publishedYes
Event205th Electrochemical Society Meeting - San Antonio, TX, United States
Duration: 9 May 200414 May 2004

Publication series

NameProceedings - Electrochemical Society
VolumePV 2004-22

Conference

Conference205th Electrochemical Society Meeting
Country/TerritoryUnited States
CitySan Antonio, TX
Period9/05/0414/05/04

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