尿素改性碳纤维电场电极制备及电化学性能研究

Preparation of Electric Field Electrodes Based on Carbon Fibers Modified with Urea and Its Electrochemical Performances

以尿素为氮源,对碳纤维表面进行改性,制备了一种新型海洋电极,并测试了其电化学性能和电场响应性能。结果表明,碳纤维表面的含氧和含氮基团对其电化学性能具有显著的影响,与尿素反应并在450℃条件下热处理的碳纤维具有最低的内阻和最大的比电容。电化学性能的变化也直接影响碳纤维电极对的电场性能,450℃条件下热处理的碳纤维电极也具有最佳的电场性能:电极对极差稳定性降到0.1 m V/24 h左右,自噪声为2.2 n V/rt Hz@1Hz,电极对能较好地响应出1 m Hz、1 m V电场信号。

A new kind of marine electrode for electric field test was prepared by modifying carbon fiber with urea, and its elec- trochemical and electric field response performances were tested. The results show that the oxygen-oontaining and nitrogen con- taining groups on the surface of carbon fiber have significant effects on its electrochemical performances. The carbon fiber elec- trode treated with urea at 450℃ has the lowest internal resistance and maximum specific capacitance. The electrochemical per- formanees also directly affect the electric field performances of its electrode pair. The carbon fibers treated with urea at 450 ℃ has the best electric field performances ： its potential drift was reduced to about 0. 1 mV/24 h, the self-noise was around 2. 2 nV/ rtHz @ 1 Hz, and its electrode pair shows a good response to the electric field signal at 1 mHz, 1 mV.