析氧
无定形固体
塔菲尔方程
金红石
材料科学
水溶液
溅射沉积
电催化剂
氧气
化学工程
过电位
薄膜
电极
无机化学
溅射
电化学
化学
结晶学
纳米技术
物理化学
有机化学
工程类
作者
Etsushi Tsuji,Akihito Imanishi,Ken−ichi Fukui,Yoshihiro Nakato
标识
DOI:10.1016/j.electacta.2010.11.062
摘要
The electrocatalytic activity of amorphous and crystalline RuO2 thin films for oxygen evolution in an aqueous solution was investigated. The RuO2 films were prepared on FTO substrates by electrodeposition or RF magnetron sputtering technique. The obtained films were annealed at various temperatures. In both cases, the as-prepared films or the 200 °C annealed film had an amorphous structure, whereas the films annealed at 300 °C and over were crystallized to rutile structure. The analysis of the Tafel slope indicated that the rate-determining step in the oxygen evolution reaction on the amorphous RuO2 was the combination of the adjacent Ru–OH groups, whereas that on crystalline RuO2 was the dissociation of O–H bond in Ru–OH group. The onset potentials of the amorphous RuO2 films for oxygen evolution were shifted toward the negative side by 0.06–0.03 V from those for the rutile crystalline samples. The shift of the onset potential is probably attributed to the structural flexibility which is characteristic of the amorphous surface. This result suggested that the electrocatalytic activity of amorphous RuO2 for oxygen evolution was higher than that of rutile crystalline RuO2.
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