Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 40, Issue 7, Pages 2971-2978Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.01.014
Keywords
Direct methanol fuel cell; Nitrogen-modified mesoporous carbons; Platinum nanoparticles; Electrochemical activities; Methanol electrooxidation
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Funding
- National Natural Science Foundation of China [21103014]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [12KJA150003]
- Foundation of Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology [BM2012110]
- Foundation of Jiangsu Key Laboratory for Solar Cell Materials and Technology [201201]
- Graduate Innovation Project of Jiangsu Province [CXZZ13_0730]
- Qing Lan Project
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
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Nitrogen-modified mesoporous carbons (N-MCs) are synthesized via a modified dual-templating approach, in which phenolic polymer is used as a carbon source, dicyandiamide as a nitrogen source, silica nanospheres as a hard template, and triblock copolymer F127 as a soft template, respectively. Structural characterizations reveal that the N-MCs with large mesopore and uniform mesoporous networks possess three different nitrogen-containing groups, all of which can serve as catalytically active sites. Platinum nano-particles supported on N-MCs (Pt/N-MCs) are prepared by polyol reduction method. As supported by transmission electron microscopy (TEM), homogeneously dispersed Pt nanoparticles are attached to the pore wall of N-MCs with an average size of ca. 2.0 nm, much smaller than that of commercial Pt/C. Electrochemical studies reveal that the Pt/N-MCs has higher electrocatalytic activities for methanol oxidation in comparison to the Pt/MCs and commercial Pt/C, which may be attributed to pyridinic and pyrrolic nitrogen offering p electrons to the sp(2) hybridized graphitic carbon layers, leading to the decrease of inner electrical resistance and enhanced proton diffusion rate, as well as a more uniform particle size distribution of Pt on N-MCs. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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