Investigation of hollow nitrogen-doped carbon spheres as non-precious Fe-N4 based oxygen reduction catalysts

Jakkid Sanetuntikul, Chitiphon Chuaicham, Young Woo Choi, Sangaraju Shanmugam

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

The development of inexpensive non-precious oxygen reduction catalysts has become one of the most important efforts in polymer electrolyte membrane fuel cells. In this report, we synthesized a non-precious electrocatalyst from a single precursor, iron(iii) diethylene triaminepentaacetate, using a heat-treatment effect to prepare an active catalyst. A series of catalysts were prepared at different temperatures leading to different degrees of graphitization, heteroatom content and activity. In 0.1 M KOH electrolyte solution, the oxygen reduction reaction (ORR) onset potential of the HNCS71 catalyst was as high as 0.97 V, and half-wave potentials were only 20 mV lower than those for Pt/C. X-ray absorption measurements of the Fe K-edge showed the structure of Fe-N4 centers, formed in HNCS71, which were responsible for the ORR activity. An alkaline exchange membrane fuel cell fabricated with HNCS71 as the cathode was tested in a H2-O2 single cell and showed a maximum power density of ∼68 mW cm-2. The 100 hour fuel cell durability test of the HNCS71 cathode showed a decay in the current density of about 14% at 0.4 V. Therefore, the HNCS catalyst appears to be a promising new class of non-precious catalysts for fuel cell applications.

Original languageEnglish
Pages (from-to)15473-15481
Number of pages9
JournalJournal of Materials Chemistry A
Volume3
Issue number30
DOIs
Publication statusPublished - Aug 14 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Fingerprint Dive into the research topics of 'Investigation of hollow nitrogen-doped carbon spheres as non-precious Fe-N<sub>4</sub> based oxygen reduction catalysts'. Together they form a unique fingerprint.

Cite this