三种碳基电极材料的电化学性质对比研究(英文)

对硼掺杂纳米金刚石(BDND),硼掺杂微米金刚石(BDMD)和玻碳(GC)电极的电化学性质做了对比研究.利用扫描电子显微镜表征了BDMD和BDND电极,其表面粒子大小分别为1-5μm和20-100nm.利用Raman光谱对两种金刚石薄膜的成分进行了表征,结果表明利用热丝化学气相沉积法得到了高质量的BDND和BDMD薄膜.采用0.5mol·L-1H2SO4溶液测定了三种电极的电化学窗口,BDND和BDMD电极的电化学窗口分别为3.3和3.0V,远比GC电极(2.5V)的要宽.Fe(CN)6]3-/Fe(CN)6]4-溶液的循环伏安和交流阻抗测定表明,在BDND、BDMD和GC电极上的峰间距(△Ep)分别为73、92和112mV,且其电子传递电阻(Ret)分别为(98±5)、(260±19)和(400±25)Ω.我们也研究了0.1mmol·L-1双酚A在三种电极上的电化学氧化行为.上述的电化学测定结果表明,两种金刚石电极均比GC电极表现出了更宽的电化学窗口、更好的电化学可逆性质、更快的电子传递速度和更高的电化学稳定性,更为重要的是与BDMD相比BDND的电化学性质有进一步的提高.

Comparative Study of Electrochemical Performances of Three Carbon-Based Electrode Materials

The electrochemical properties of three carbon-based electrodes including boron-doped nanocrystalline diamond (BDND), boron-doped microcrystalline diamond (BDMD), and glassy carbon (GC) were compared. We used scanning electron microscopy to characterize the two diamond electrodes and the grain sizes of the BDMD and BDND films were 1-5 μm and 20-100 nm, respectively. The phase composition was characterized by Raman spectroscopy and high-quality BDMD and BDND films were formed by hot-filament chemical vapor deposition. Cyclic 3.3 and 3.0 V, respectively. The potential windows were much wider than that of the GC electrode (2.5 V). The cyclic voltammograms and Nyquist plots of the impedance measurements for Fe(CN)6]3-/Fe(CN)6]4- show peak to peak separations (△Ep) of 73, 92, and 112 mV and electron transfer resistances (Ra)of (98±5), (260±19), and (400±25) Ω for (BPA) on the three carbon-based electrodes. The above-mentioned electrochemical results reveal that the two diamond electrodes have wider potential windows, better reversibility, faster electron transfer, and higher stability than the GC electrode. Additionally, the BDND electrode shows better electrochemical properties than the BDMD electrode.