Surface Hydrogenation of Boron-Doped Diamond Electrodes by Cathodic Reduction
Surface Hydrogenation of Boron-Doped Diamond Electrodes by Cathodic Reduction
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DOI：
10.1021/acs.analchem.7b02129
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发表时间：
2017-11-07
影响因子：
7.4
通讯作者：
Einaga, Yasuaki
中科院分区：
文献类型：
--
作者：
Kasahara, Seiji;Natsui, Keisuke;Einaga, Yasuaki
掺硼金刚石（BDD）具有宽电位窗口和低背景电流等优异性能，作为一种很有前途的电极材料，特别是用于电化学传感系统，引起了人们的广泛关注。众所周知，BDD电极的电化学性能对表面封端非常敏感，例如它是氢封端还是氧封端。通过阴极还原（CR）对BDD电极进行预处理以使其表面钝化已被广泛用于实现高灵敏度。然而，关于CR处理条件对表面氢化的影响知之甚少。在这篇文章中，我们报告了一个系统的研究CR处理，可以实现有效的表面氢化。结果发现，在较低pH值的溶液中施加更负的电位可以改善表面氢化。这是因为在CR处理中由质子产生的氢原子有助于表面氢化。经过CR处理后，BDD表面可以不完全氢化，但足以实现高灵敏度的电化学传感。此外，我们证实可以实现具有高重复性的氢化。
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.