Formation of RuO(OH)2 on RuO2-Based Electrodes for Hydrogen Production

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• 作者：Lars-脜ke N盲slund ; 脕rni S. Ingason ; Susanne Holmin ; Johanna Rosen
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 17, 2014
• 年：2014
• 卷：118
• 期：28
• 页码：15315-15323
• 全文大小：372K
• ISSN：1932-7455

文摘

The catalytic and durable electrode coating of ruthenium dioxide (RuO₂), applied on nickel (Ni) substrates, is today utilized as electrocatalytic cathodes for hydrogen production, e.g., in the chlor-alkali process and alkaline water electrolysis. The drawback is, however, the sensitivity to reverse currents obtained during power shutdowns, e.g., at maintenance, where the RuO₂-based electrodes can be severely damaged unless polarization rectifiers are employed. Through the material characterization techniques X-ray diffraction and X-ray photoelectron spectroscopy, we can now reveal that RuO₂ coatings, when exposed to hydrogen evolution at industrially relevant conditions, transforms into ruthenium oxyhydroxide (RuO(OH)₂). The study further shows that as the hydrogen evolution proceeds the formed RuO(OH)₂ reduces to metallic ruthenium (Ru).