Spherical Core-Shell Titanium (Oxy) nitride@Nitrided Carbon Composites as Catalysts for the Oxygen Reduction Reaction: Synthesis and Electrocatalytic Performance

被引:15
作者
Wassner, Maximilian [1 ]
Eckardt, Markus [2 ]
Gebauer, Christian [2 ]
Huesing, Nicola [1 ]
Behm, R. Juergen [2 ]
机构
[1] Salzburg Univ, Mat Chem, Hellbrunnerstr 34, A-5020 Salzburg, Austria
[2] Univ Ulm, Inst Surface Chem & Catalysis, Albert Einstein Allee 47, D-89069 Ulm, Germany
来源
CHEMELECTROCHEM | 2016年 / 3卷 / 10期
关键词
doping; electrocatalysis; oxygen reduction reaction; Pt-free catalysis; titanium (oxy)nitride; ELECTROLYTE FUEL-CELL; ANATASE-TYPE TIO2; PT-FREE CATALYSTS; HYDROTHERMAL CARBONIZATION; RUTILE TRANSFORMATION; DISK ELECTRODE; ACTIVE-SITES; EX-SITU; NANOPARTICLES; DEGRADATION;
D O I
10.1002/celc.201600246
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Aiming at the development of highly active and stable platinum-free catalysts for the oxygen reduction reaction (ORR) in polymer electrolyte fuel cells (PEFCs), we explored the potential of a new composite material, where the core-shell structure should result in a combination of high ORR activity and improved electric conductivity. TiOxNy@CnNm composite nanoparticles were prepared by covering uniform carbon spheres of about 300 nm in size, synthesized through the hydrothermal reaction of glucose, with a homogeneous titania shell made by sol-gel processing. The core-shell particles were then subjected to nitridation in ammonia vapor at different temperatures (550 degrees C-150 degrees C). The influence of the nitridation temperature on the structure and phase composition of the resulting composite particles was evaluated by a variety of techniques, including electron microscopy (SEM, TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), elemental analysis, thermogravimetric (TG) analysis, and N-2 sorption measurements, the electrochemical properties and the ORR performance of the materials were determined by rotating ring disk electrode (RRDE) measurements. Trends in the evolution of the structural/chemical properties and electrochemical/electrocatalytic properties as well as correlations between them are discussed; an optimized mesoporosity of the titanium (oxy) nitride shell was identified as the key criterion for the catalyst's ORR performance.
引用
收藏
页码:1641 / 1654
页数:14
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