Structures and properties of PtRu electrocatalyts derived from the alignedRuO2 nanorods RuO2NR are investigated using scanning electron microscopy transmission electron microscopy X-ray diffraction X-ray photoelectron spectroscopy and cyclic voltammetry towardCOads and methanol oxidation. The catalytic activity of methanol oxidation and the CO tolerance are promoted significantly by reducing RuO2 into Ru metal before decorating with Pt. Reduction of RuO2NR was carried out by either thermal decomposition at 650 C in vacuum or H2-reduction at 130 C in low-pressure hydrogen. Reduction assisted by hydrogen allows infiltrating decomposition at low temperature and
produces an array of nanorods with rugged walls featuring small Ru nuclei and larger surface area. Pt-RuNR whose surface PtRu ratio 0.580.42 was prepared by decorating with 0.1 mg cm-2 Pt on the H2-reduced array containing 0.39 mg cm-2 Ru demonstrates a favorable combination of CO tolerance and high methanol oxidation activity superior to other RuO2NR-derived catalysts. When compared with a commercial electrocatalyst of PtRu 11 alloy 4 nmthe activity of Pt-RuNR in methanol oxidation is shown to be somewhat lower at potential 0.48 V and higher at potential 0.48 V.
Electrocatalyst; direct methanol fuel cell; PtRu
: X-rays -- diffraction
: 539.722 2 Shi s
Source Article of journal Department of Chemical Engineering and Department of Electronic Engineering, National Taiwan UniVersity of Science and Technology, Taipei