Giant electric double-layer capacitance of heavily boron-doped diamond electrode

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• 作者：Takeshi Watanabe ; Tomoko K. Shimizu ; Yoshitaka Tateyama ; Yousoo Kim ; Maki Kawai ; Yasuaki Einaga
• 关键词：Boron-doped diamond ; Electrochemistry ; sp²– ; sp³ composite materials ; Heavily doping ; Electric double-layer capacitance
• 刊名：Diamond and Related Materials
• 出版年：2010
• 出版时间：July-September 2010
• 年：2010
• 卷：19
• 期：7-9
• 页码：772-777
• 全文大小：946 K

文摘

The physical and electrochemical properties of boron-doped polycrystalline diamond electrodes, prepared with various B/C ratio, i.e., 0.1 % , 0.5 % (BDD-A), 1 % (BDD-B), and 5 % (BDD-C), were investigated. Electrochemical measurements of the heavily boron-doped films (BDD-C) showed giant electric double-layer capacitance and activity which is significantly larger than BDD-A and BDD-B as well as glassy carbon electrodes. However, interestingly, actual boron concentration of BDD-C was observed to be almost the same as that of BDD-B by secondary ion mass spectroscopy (SIMS) and glow discharge optical emission spectroscopy (GDOES) analysis. It is suggested that the large capacitance is due to a few sp²-bonded carbon impurities, which was observed only in BDD-C, although the amount of the sp²-bonded nondiamond species are very small. In the present work, the reason for the interesting electrochemical properties of heavily boron-doped diamond electrodes is discussed. Furthermore, dimensional stability of the electrodes was also confirmed by conducting harsh anodic treatment.