Oxygen reduction characteristics of several valve metal oxide electrodes in HClO(4) solution
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概要
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In the search for active cathode catalysts for polymer electrolyte fuel cells (PEFCs) using inexpensive materials several valve metal oxide electrodes TiO(x) ZrO(x), and TaO(x) with corresponding binary oxide electrodes were selected for the evaluation of catalytic activity for oxygen reduction reaction (ORR) by means of cyclic voltammetry in 0 1 M HClO(4) at 60 C These oxide electrodes were prepared mainly by the dip-coating method on a titanium plate substrate at a temperature between 400 degrees C and 500 degrees C and were characterized by scanning electron microscopy (SEM) X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS) Among the oxide-coated electrodes investigated Ti(0) (7)Zr(0) (3)O(x)/Ti provided the highest ORR specific activity with an onset potential E(ORR) of 0 86V vs RHE during the cathodic potential sweep Fine TaO(x) particles prepared as an extension of the dip-coating method showed very high catalytic activity determined by means of hydrodynamic voltammetry in 0 1 M HClO(4) at 30 degrees C with an E(ORR) of 0 90 V vs RHE
著者
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Takasu Y
Department Of Materials And Chemical Engineering Faculty Of Textile Science And Technology Shinshu U
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Ohashi Tatsuya
Department Of Materials And Chemical Engineering Faculty Of Textile Science And Technology Shinshu U
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Sugimoto Wataru
Department Of Materials And Chemical Engineering Faculty Of Textile Science And Technology Shinshu U
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Sugimoto Wataru
Department Of Materials And Chemical Engineering Faculty Of Textile Science And Technology Shinshu U
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Takasu Yoshio
Department Of Materials And Chemical Engineering Faculty Of Textile Science And Technology Shinshu University
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- Oxygen reduction characteristics of several valve metal oxide electrodes in HClO(4) solution