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首页> 外文会议>International Symposium on Energy and Electrochemical Processes for a Cleaner Environment, 2001, San Francisco, CA >THRESHOLD EFFECT OF ADMIXTURES OF PLATINUM ON THE ELECTROCHEMICAL ACTIVITY OF AMORPHOUS DIAMOND-LIKE CARBON THIN FILMS
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THRESHOLD EFFECT OF ADMIXTURES OF PLATINUM ON THE ELECTROCHEMICAL ACTIVITY OF AMORPHOUS DIAMOND-LIKE CARBON THIN FILMS

机译：铂添加剂对非晶金刚石样碳膜的电化学活性的阈值作用

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摘要

The electron transfer kinetics in Fe(CN)_6~(3-/4-) redox system at thin-film electrodes of amorphous diamond-like carbon with admixtures of platinum (up to 15 at. %) is studied. The wide-gap diamond-like carbon is not in itself electrochemically active; however, it acquires the electrochemical activity upon introducing platinum into the DLC bulk during the film deposition. The unusual feature of the effect of platinum is its threshold nature: the electrochemical current appears at ca. 3 at. % and kind of saturates at ca. 10 at. % of Pt. By contrast, the differential capacitance increases continuously with increasing Pt content; and the film bulk resistivity practically does not change. The observed effects are explained in terms of a model assuming nonuniform character of both electric conductance in the DLC bulk and the facilitation of electron transfer by Pt clusters on the electrode/solution interface.
机译：研究了Fe（CN）_6〜（3- / 4-）氧化还原体系中非晶态类金刚石碳与铂（最高为15at。％）的混合物的薄膜电极上的电子转移动力学。宽间隙的类金刚石碳本身并不具有电化学活性。然而，它在膜沉积过程中将铂引入DLC块中时具有电化学活性。铂效应的不寻常特征是它的阈值性质：电化学电流出现在约。 3 at。 ％和种类饱和在约。 10点铂的百分比相反，差分电容随着Pt含量的增加而连续增加；膜的体电阻率几乎不变。根据模型解释了观察到的效果，该模型假定DLC主体中的电导率和电极/溶液界面上的Pt团簇促进电子转移均具有不均匀的特性。

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