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Abstract
Pt/C is widely used as the electrocatalyst for PEFCs, while durability is still an important issue associated with e.g. detachment and aggregation of Pt nanocatalysts. As oxide-supported electrocatalysts exhibit high durability against potential cycling, Pt-TiO2 nanocomposite electrocatalysts with a maximum contact area between Pt and TiO2 are developed for further improving their durability. X-ray diffraction (XRD) and microstructural observation by scanning transmission electron microscopy (STEM) confirmed the preparation of Pt-TiO2 nanocomposite electrocatalysts. Optimal preparation conditions are considered by varying the volume ratio of Pt to TiO2. Possible advantages and remaining issues of this nanocomposite concept are discussed.
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