Electrocatalysis Characteristics of a Polynuclear Cyanide Complex, Ruthenium Purple, for Dihydrogen Oxidation |
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Authors: | Toshiyuki Abe Toshiki Nagasaka and Akio Tajiri |
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Affiliation: | (1) Department of Materials Science and Technology, Hirosaki University, Hirosaki, 036-8561, Japan |
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Abstract: | An electrocatalytic dihydrogen oxidation was found to take place on an electrode coated with iron(III) ruthenocyanide (i.e., repeating unit cell structure: FeIII
4RuII(CN)6]3 or MFeIIIRuII(CN)6] and M = alkali metal counter ion) called ruthenium purple (RP). It was shown by voltammetric study that an electrocatalytic dihydrogen oxidation is induced on oxidizing the FeII ion in the cyanometallate. When the electrocatalysis characteristics of RP were investigated by voltammetry, especially in terms of the kinds of electrolyte used (K+ or Na+), RP exhibited a more efficient electrocatalysis in the K+ than in the Na+ electrolyte system. While a one-electron electro-oxidation of FeII to FeIII occurs, there is also a release of hydrated alkali metal cation(s) from the anionic RP (i.e., reduced RP) to compensate for charge. Moreover, cation transport through the cyanometallate network is more facile for the K+ electrolyte system (cf., size of hydrated cation: Na+ at 0.36 nm lattice channel of RP at 0.35 nm > K+ at 0.24 nm). Therefore, it was most probable that the present electrocatalysis is kinetically dominated by the electro-oxidation. |
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Keywords: | Dihydrogen oxidation electrocatalysis molecular catalysis ruthenium purple |
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