期刊
JOURNAL OF POWER SOURCES
卷 302, 期 -, 页码 114-125出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.10.055
关键词
Oxygen reduction reaction; Noble metal-free electrocatalyst; N-doped graphene; Encapsulation; Pyrolysis
资金
- Fundamental Research Funds for the Central Universities of China [2662014BQ055, 2662015QC046]
- National Natural Science Foundations of China [21303064]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130146120013]
Development of low-cost and highly efficient electrocatalysts for oxygen reduction reaction (ORR) is still a great challenge for the large-scale application of fuel cells and metal-air batteries. Herein, a noble metal-free ORR electrocatalyst in the form of N-doped graphene coupled with part of Co nanoparticles encased in N-doped graphitic shells (named as SUCo-0.03-800) is prepared by facile one-step pyrolysis of the mixture of sucrose, urea and cobalt nitrate. The novel structure is confirmed by High Resolution-TEM, XRD, XPS and Raman spectroscopy. SUCo-0.03-800 presents comparable ORR catalytic activity to commercial Pt/C catalyst with a dominating four-electron pathway under alkaline conditions, and both of its mass activity and volume activity also outperform Co-free N-doped graphene and other COIN C hybrids with higher Co content, which may probably be ascribed to the high specific surface area, novel structure and synergistiC effect between encased Co nanoparticles and N-doped graphitic shell. Additionally, SUC0-0.03-800 also shows outstanding stability and improved selectivity towards ORR, making it a promising alternative to Pt with potential application in fuel cells and metal-air batteries. (C) 2015 Elsevier B.V. All rights reserved,
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