期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 9, 期 3, 页码 854-866出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cy02207k
关键词
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资金
- Brazilian National Council for Scientific and Technological Development (CNPq) through the program Science without Borders [232484/2014-7]
- Research Training Group Micro-, meso- and macroporous Nonmetallic Materials: Fundamental and Applications (MIMENIMA) [GRK 1860]
- German Federal Ministry of Education and Research (BMBF) (INNO INDIGO project) [01DQ15013]
- Estonian Research Council (INNO INDIGO project)
- Estonian Ministry of Education and Research [IUT20-16, IUT2-24]
- European Regional Development Fund [TK141]
Cobalt/nickel-containing SiOC-based porous ceramic electrocatalysts were prepared by pyrolysis of poly(methyl silsesquioxane) and poly(methyl phenyl silsesquioxane) as preceramic precursors combined with graphite and Co/Ni metal salts at 1000 degrees C in an atmosphere of nitrogen. Subsequently, the Co/Ni-SiOC materials were N-doped using dicyandiamide (DCDA) as a nitrogen source and pyrolysed at 800 degrees C in an inert atmosphere. The structural properties and composition of the catalysts were characterised by scanning electron microscopy (SEM), X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and N-2 adsorption analysis. The evaluation of the polymer-derived SiOC(N) ceramic electrocatalysts as a new class of catalysts for the oxygen reaction reduction (ORR) was carried out by the rotating disk electrode (RDE) method under acidic, neutral and alkaline conditions. The O-2 reduction studies revealed that the N-doped materials exhibited enhanced ORR performance, confirming the positive influence of the nitrogen functionalities introduced into the catalysts. The Co-containing N-doped SiOC catalyst exhibited significantly higher ORR activity compared with the studied materials along with the highest electron transfer number in all the studied solutions. Long-term ORR performance testing indicated that the durability of this catalyst was superior as compared to that of commercial Pt/C. These observations suggest that the Co-containing N-doped SiOC catalyst is a promising cathode material for fuel cells (FCs) and microbial FC devices.
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