Surface Hydrogenation of Boron-Doped Diamond Electrodes by Cathodic Reduction

被引:67
|
作者
Kasahara, Seiji [1 ]
Natsui, Keisuke [1 ]
Watanabe, Takeshi [2 ]
Yokota, Yasuyuki [3 ]
Kim, Yousoo [3 ]
Iizuka, Shota [4 ,5 ]
Tateyama, Yoshitaka [4 ,5 ]
Einaga, Yasuaki [1 ,6 ]
机构
[1] Keio Univ, Dept Chem, 3-14-1 Hiyoshi, Yokohama, Kanagawa 2238522, Japan
[2] Aoyama Gakuin Univ, Dept Elect Engn & Elect, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 2525258, Japan
[3] RIKEN, Surface & Interface Sci Lab, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
[4] NIMS, Ctr Green Res Energy & Environm Mat GREEN, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan
[5] NIMS, Res & Serv, Div Mat Data & Integrated Syst MaDIS, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan
[6] Japan Sci & Technol Agcy, ACCEL, Chiyoda Ku, 5-3 Yonbancho, Tokyo 1028666, Japan
基金
日本科学技术振兴机构;
关键词
ELECTROCHEMICAL OXIDATION; AMPEROMETRIC DETECTION; INJECTION-ANALYSIS; FREE CHLORINE; EVOLUTION; WATER; ACID; DEPENDENCE; DOPAMINE; BEHAVIOR;
D O I
10.1021/acs.analchem.7b02129
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Boron-doped diamond (BDD) has attracted much attention as a promising electrode material especially for electrochemical sensing systems, because it has excellent properties such as a wide potential window and low background current. It is known-that the electrochemical properties of BDD electrodes are very sensitive to the surface termination such as to whether it is hydrogen- or oxyge-terminated. Pretreating BDD electrodes by cathodic reduction (CR) to hydrogenate the surface has been widely used to achieve high sensitivity. However, little is known about the effects of the CR treatment conditions on surface hydro-genation. In this Article, we report on a systematic study of CR treatments that can achieve effective surface hydrogenation. As a result, we found that the surface hydrogenation could be improved by applying a more negative potential in a lower pH solution. This is because hydrogen atoms generated from protons in the CR treatment contribute to the surface hydrogenation. After CR treatments, BDD surface could be hydrogenated not completely but sufficiently to achieve high sensitivity for electrochemical sensing. In addition, we confirmed that hydrogenation with high repeatability could be achieved.
引用
收藏
页码:11341 / 11347
页数:7
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