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Catalysts 2015, 5(3), 1079-1091; doi:10.3390/catal5031079

Microwave Synthesis of High Activity FeSe2/C Catalyst toward Oxygen Reduction Reaction

1
Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
2
Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen 361005, China
*
Author to whom correspondence should be addressed.
Academic Editor: Minhua Shao
Received: 16 May 2015 / Revised: 18 June 2015 / Accepted: 23 June 2015 / Published: 30 June 2015
(This article belongs to the Special Issue Electrocatalysis in Fuel Cells)
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Abstract

The carbon supported iron selenide catalysts (FeSe2/C) were prepared with various selenium to iron ratios (Se/Fe), namely, Se/Fe = 2.0, 2.5, 3.0, 3.5 and 4.0, through facile microwave route by using ferrous oxalate (FeC2O4·2H2O) and selenium dioxide (SeO2) as precursors. Accordingly, effects of Se/Fe ratio on the crystal structure, crystallite size, microstructure, surface composition and electrocatalytic activity for oxygen reduction reaction (ORR) of FeSe2/C in an alkaline medium were systematically investigated. The results revealed that all the FeSe2/C catalysts obtained with the Se/Fe ratios of 2.0–4.0 exhibited almost pure orthogonal FeSe2 structure with the estimated mean crystallite sizes of 32.9–36.2 nm. The electrocatalytic activities in potassium hydroxide solutions were higher than those in perchloric acid solutions, and two peak potentials or two plateaus responded to ORR were observed from cyclic voltammograms and polarization curves, respectively. The ORR potentials of 0.781–0.814 V with the electron transfer numbers of 3.3–3.9 at 0.3 V could be achieved as the Se/Fe ratios varied from 2.0 to 4.0. The Fe and Se were presented at the surface of FeSe2/C upon further reduction on FeSe2. The Se/Fe ratios slightly influenced the degree of graphitization in carbon support and the amount of active sites for ORR. View Full-Text
Keywords: fuel cells; oxygen reduction reaction; electrocatalytic activity; iron selenide catalysts fuel cells; oxygen reduction reaction; electrocatalytic activity; iron selenide catalysts
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Zheng, Q.; Cheng, X.; Li, H. Microwave Synthesis of High Activity FeSe2/C Catalyst toward Oxygen Reduction Reaction. Catalysts 2015, 5, 1079-1091.

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