Journal
JOURNAL OF POWER SOURCES
Volume 272, Issue -, Pages 267-276Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.08.104
Keywords
Electrocatalysis; Mesoporous carbon vesicle; Oxygen reduction reaction; Nitrogen and sulfur co-doping; Metal-free catalysts
Funding
- Fundamental Research Funds for the Central Universities [14QNJJ011]
- China Postdoctoral Science Foundation [2014M550164]
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Nitrogen and sulfur co-doped onion-like mesoporous carbon vesicle (NS-MCV) with multilayer lamellar structure is synthesized as a metal-free catalyst through a convenient and economical procedure. The synthesized materials are systematically characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectra, nitrogen adsorption-desorption, and X-ray photoelectron spectroscopy (XPS). The characterization results demonstrate that N and S atoms can be successfully doped into the framework of MCV with little impact on the morphology and structure. The NS-MCV manifests a remarkably high electrocatalytic activity as a metal-free electrocatalyst for the oxygen reduction reaction (ORR) with mainly a four-electron transfer pathway. Moreover, in contrast to the commercially available Pt/C catalyst, the NS-MCV shows much better long-term stability and tolerance toward methanol crossover in an alkaline medium. Such excellent performances can be mainly attributed to the synergistic effect arising from the addition of N and S heteroatom, optimized S content and high surface area. The NS-MCV with a simple synthesis method may further exploited as potentially efficient and inexpensive metal-free ORR catalyst materials. (C) 2014 Elsevier B.V. All rights reserved.
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