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Catalysts 2015, 5(3), 1211-1220; doi:10.3390/catal5031211

Positive Effect of Heat Treatment on Carbon-Supported CoS Nanocatalysts for Oxygen Reduction Reaction

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 Beisanhuan Eastroad, Beijing 100029, China
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Author to whom correspondence should be addressed.
Academic Editor: Minhua Shao
Received: 7 May 2015 / Revised: 25 June 2015 / Accepted: 29 June 2015 / Published: 15 July 2015
(This article belongs to the Special Issue Electrocatalysis in Fuel Cells)
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Abstract

It is of increasing interest and an important challenge to develop highly efficient less-expensive cathode catalysts for anion-exchange membrane fuel cells (AEMFCs). In this work, we have directly prepared a carbon-supported CoS nanocatalyst in a solvothermal route and investigated the effect of heat-treatment on electrocatalytic activity and long-term stability using rotating ring-disk electrode (RRDE). The results show that the heat-treatment below 400 °C under nitrogen atmosphere significantly enhanced the electrocatalytic performance of CoS catalyst as a function of annealed temperature in terms of the cathodic current density, the half-wave potential, the HO2 product and the number of electrons transferred. The CoS catalyst that annealed at 400 °C (CoS-400) has exhibited a promising performance with the half-wave potential of 0.71 V vs. RHE (the highest one for non-precious metal chalcogenides), the minimum HO2 product of 4.3% at 0.60 V vs. RHE and close to the 4-electron pathway during the oxygen reduction reaction in 0.1 M KOH. Also, the CoS-400 catalyst has comparable durability to the Pt/C catalyst. View Full-Text
Keywords: non-precious metal catalyst; heat-treatment; oxygen reduction reaction; alkaline medium; solvothermal synthesis non-precious metal catalyst; heat-treatment; oxygen reduction reaction; alkaline medium; solvothermal synthesis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhong, H.; Xi, J.; Tang, P.; Li, D.; Feng, Y. Positive Effect of Heat Treatment on Carbon-Supported CoS Nanocatalysts for Oxygen Reduction Reaction. Catalysts 2015, 5, 1211-1220.

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