In-situ X-ray diffraction study of metal hydride formation in palladium and palladium-based alloy electrodes under cathodic hydrogen charging.

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概要

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• An in situ X-ray diffraction (XRD) technique reported earlier was improved and employed to study the hydride formation in Pd and Pd–Au alloy foils and amorphous Pd–Zr alloy ribbons during cathodic hydrogen charging or its reverse process. The phase transformation from α- to β-PdH<I><SUB>x</SUB></I> in the Pd electrode, accompanied by an increase in the cell volume, was demonstrated to take place by the formation of a β phase domain in the bulk during the cathodization. The lattice constant was discontinuously changed from <I>a</I>\simeq3.92 to 4.04 Å and such a discontinuous change was observed on the Pd<SUB>90</SUB>Au<SUB>10</SUB> alloy as well. However, no phase transformation was observed on the Pd–Au alloys with the Pd content of 70 at.% or below, where the lattice constant increased continuously with an increase in the negative potential for the cathodic polarization. No crystallization in the amorphous Pd–Zr alloy ribbon electrodes was detected after hydrogen charging.

• 公益社団法人 日本化学会の論文

著者

• Machida Ken-ichi

  Research Institute for Catalysis, Hokkaido University

• Enyo Michio

  Research Institute for Catalysis, Hokkaido University

関連論文

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