Synthesis and characterization of nitrogen-doped ordered mesoporous hollow carbon spheres for the ORR

M. Salazar-Oropeza, B. Escobar-Morales, E. Reguera, F. J. Rodriguez-Varela, I. L. Alonso-Lemus

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

2 Scopus citations

Abstract

This work presents the synthesis by a silica template-based method of metal-free electrocatalyst for the Oxygen Reduction Reaction (ORR) for alkaline fuel cells. Nitrogen-doped Ordered Mesoporous Hollow Carbon Spheres (N-OMHCS) was obtained starting from a SiOa template. The N-OMHCS material has been functionaltzed with methanol using the intermittent microwave heating technique to produce the N-OMHCS-f electrocatalyst. Then, the catalytic activity of N-OMHCS and N-OMHCS-f electrocatalysts were evaluated for the ORR in 0.5 mol L"1 KOH, with the rotating ring-disk electrode technique (RRDE). The electrochemical results indicate that N-OMHCS-f has higher catalytic activity for the ORR than N-OMHCS, whit an onset potential of 0.81 and 0.82 V vs. RHE and a limiting current of-3.6 and-2.3 mA cm"2, respectively. On the other hand, both electrocatalysts produce about the same amount of H2O2 (between 14 and 26 %). The catalytic activity of N-OMHCS and N-OMHCS-f can be attributed to the nitrogen species on their surface and their porous structure, which provides a triple phase region promoting the adsorption-desorption of 02.

Original languageEnglish
Title of host publicationECS Transactions
EditorsD.J. Jones, H. Gasteiger, H. Uchida, T.J. Schmidt, F. Buechi, K.E. Swider-Lyons, B.S. Pivovar, P.N. Pintauro, V.K. Ramani, J.M. Fenton, P. Strasser, K.E. Ayers, A.Z. Weber, T.F. Fuller, R.A. Mantz, H. Xu, C. Coutanceau, S. Mitsushima, S. Narayan, P. Shirvanian, Y.-T. Kim, Y. Gochi-Ponce
PublisherElectrochemical Society Inc.
Pages595-602
Number of pages8
Edition13
ISBN (Electronic)9781607688600
ISBN (Print)9781510871731
DOIs
StatePublished - 2018
Externally publishedYes
EventSymposium on Polymer Electrolyte Fuel Cells and Electrolyzers 18, PEFC and E 2018 - AiMES 2018, ECS and SMEQ Joint International Meeting - Cancun, Mexico
Duration: 30 Sep 20184 Oct 2018

Publication series

NameECS Transactions
Number13
Volume86
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

ConferenceSymposium on Polymer Electrolyte Fuel Cells and Electrolyzers 18, PEFC and E 2018 - AiMES 2018, ECS and SMEQ Joint International Meeting
Country/TerritoryMexico
CityCancun
Period30/09/184/10/18

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