Preparation of Mn-N-C catalyst and its electrocatalytic activity for the oxygen reduction reaction in alkaline medium

ZHANG Rong; ZHANG Jing; MA Fei; WANG Wen-yang; LI Rui-feng

Volume 42 Issue 04

Apr. 2014

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Article Navigation > Journal of Fuel Chemistry and Technology > 2014 > 42(04): 467-475

ZHANG Rong, ZHANG Jing, MA Fei, WANG Wen-yang, LI Rui-feng. Preparation of Mn-N-C catalyst and its electrocatalytic activity for the oxygen reduction reaction in alkaline medium[J]. Journal of Fuel Chemistry and Technology, 2014, 42(04): 467-475.

Citation:

ZHANG Rong, ZHANG Jing, MA Fei, WANG Wen-yang, LI Rui-feng. Preparation of Mn-N-C catalyst and its electrocatalytic activity for the oxygen reduction reaction in alkaline medium[J]. Journal of Fuel Chemistry and Technology, 2014, 42(04): 467-475.

Citation:

ZHANG Rong, ZHANG Jing, MA Fei, WANG Wen-yang, LI Rui-feng. Preparation of Mn-N-C catalyst and its electrocatalytic activity for the oxygen reduction reaction in alkaline medium[J]. Journal of Fuel Chemistry and Technology, 2014, 42(04): 467-475.

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Preparation of Mn-N-C catalyst and its electrocatalytic activity for the oxygen reduction reaction in alkaline medium

College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received Date: 2013-11-20
Rev Recd Date: 2014-01-16
Publish Date: 2014-04-30

Abstract

Abstract

Chitosan salicylaldehyde Schiff-base manganese complex (Mn-CS-sal) was synthesized by a simple chemical method and then supported on graphite carbon; the graphite-supported Mn-CS-sal (Mn-CS-sal/C) was heat-treated at different temperatures (t) to obtain the Mn-N-C catalysts (Mn-N-C-t, t=200, 400, 600, 800, 1 000 ℃). The electrocatalytic activity of Mn-N-C catalysts in the oxygen reduction reaction (ORR) was investigated and their structure and composition were characterized by Fourier Transform Infrared (FT-IR) spectrum, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results indicated that all the Mn-N-C catalysts are highly active in ORR, whereas the Mn-N-C-600 catalyst heat-treated at 600 ℃ exhibits the highest ORR activity. The excellent ORR activity of the Mn-N-C catalysts in alkaline media should be attributed to their Mn-N-C configuration. Two important kinetic parameters, i.e. the overall ORR electron transfer number (n) and electron transfer coefficiency (αn_α), were determined by the cyclic voltammetry method. The Mn-N-C-600 catalyst shows an overall electron transfer number of 3.63 for ORR, suggesting that the catalytic ORR is via a mixture of 2- and 4-electron transfer pathways, but dominated by the 4-electron transfer process. Based on these observations, a possible mechanism for ORR over the surface of Mn-N-C modified electrode is proposed.
- chitosan,
- non-precious metal catalyst,
- electrocatalysis,
- Mn-N-C,
- oxygen reduction reaction (ORR),
- heat treatment

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References

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