氨基酸改性碳纤维电极电化学及海洋电场响应性能

碳纤维表面引入含氧、含氮官能团，可提高其电化学性能和电场响应性能。将谷氨酸、甘氨酸、赖氨酸作为含氧、含氮官能团载体，在碳纤维表面接枝一层分子膜，通过扫描电子显微镜、红外吸收光谱等手段进行表面表征，并结合循环伏安曲线、电化学阻谱和电场响应曲线等测试方法，探究其电化学性能和电场响应性能变化。结果表明，改性后碳纤维电极具有较大的双电层电容和较低的低频容抗；配对碳纤维电极电位差漂移量均在5 mV/d以下，电化学自噪声均小于5 nV/Hz;配对碳纤维电极能较好地响应1 mV、1 mHz正弦交流电场信号，其中谷氨酸改性组线性度为0.058%，在改性组中最低，这与其特殊的双电层结构有关。本研究可为高性能海洋电场传感器研究提供新的技术路线和理论依据。

Electrochemical Properties and Marine Electric Field Response of Amino Acid-modified Carbon Fiber Electrode

The electrochemical properties and electric field response of carbon fiber are improved significantly by introducing oxygen- and nitrogen-containing functional groups on the carbon fiber surface. Glutamic acid, glycine and lysine are grafted onto the surface of carbon fiber as the carrier of oxygen- and nitrogen-containing functional groups. The carbon fiber surface is characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The electrochemical properties and electric field response performance of carbon fiber surface are studied from the cyclic voltammetry curve, electrochemical impedance spectrum and electric field response curve. The results show that the modified carbon fiber electrode has larger electric double layer capacitance and lower low-frequency capacitive reactance; the average daily drift of potential difference between paired carbon fiber electrodes is less than 5 mV/d, and the electrochemical self-noise is less than 5 nV/Hz; and the modified paired carbon fiber electrode can better respond to 1 mV and 1 mHz sinusoidal electric field signal, and the linearity of modified glutamic acid group is 0.058%, which is the lowest among the modified groups. These results are much related to its special electric double-layer structure.