Direct formic acid fuel cells on Pd catalysts supported on hybrid TiO2-C materials

•Direct formic acid fuel cells on Pd catalysts supported on hybrid TiO2-C materials.•Hybrid materials are efficient supports for the direct formic acid electro-oxidation on Pd-based catalysts.•Anatase is the most important crystalline TiO2 phase for the formation of conductive TiO2-C hybrid material...

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Published in:Applied catalysis. B, Environmental Environmental, 2015-02, Vol.163, p.167-178
Main Authors: Matos, Juan, Borodzinski, Andrzej, Zychora, Anna Mikolajczuk, Kedzierzawski, Piotr, Mierzwa, Bogusław, Juchniewicz, Karol, Mazurkiewicz, Marta, Hernández-Garrido, Juan C.
Format: Article
Language:English
Subjects:
Applied sciences
Catalysis
Chemistry
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Formic acid
Fuel cells
General and physical chemistry
Pd-based catalysts
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TiO2-C hybrids
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Summary:•Direct formic acid fuel cells on Pd catalysts supported on hybrid TiO2-C materials.•Hybrid materials are efficient supports for the direct formic acid electro-oxidation on Pd-based catalysts.•Anatase is the most important crystalline TiO2 phase for the formation of conductive TiO2-C hybrid materials. The electrooxidation of formic acid was performed on Pd-based catalysts supported on hybrid TiO2-C materials prepared from different carbon origins by solvothermal and slurry synthesis. It has been found that carbonized hybrid TiO2-C supports with mesopore texture and high anatase:rutile ratio in the TiO2 framework led to about three times higher activity per Pd mass unit than the catalyst prepared on a commercial Vulcan XC-72 carbon black, which will allow to reduce considerably the amount of expensive noble metal at the anode of DFAFC. The conductivities of raw TiO2/C supports are several orders of magnitude lower than that for carbon Vulcan XC-72. However, the hybrid TiO2-C supports acquire high conductivity during palladium deposition. The rate of electrooxidation of formic acid on Pd/TiO2-C catalysts, calculated per one surface Pd atom (TOF), is for TOF
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2014.07.063