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|Title:||Investigation of hollow nitrogen-doped carbon spheres as non-precious Fe-N<inf>4</inf> based oxygen reduction catalysts|
Young Woo Choi
Daegu Gyeongbuk Institute of Science and Technology
Korea Institute of Energy Research
|Citation:||Journal of Materials Chemistry A. Vol.3, No.30 (2015), 15473-15481|
|Abstract:||© 2015 Royal Society of Chemistry. 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-N<inf>4</inf> 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 H<inf>2</inf>-O<inf>2</inf> single cell and showed a maximum power density of ∼68 mW cm<sup>-2</sup>. 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.|
|Appears in Collections:||Scopus 2011-2015|
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