电聚合苯胺改性碳纤维海洋电极电化学性能及其电场响应研究  

Study of Electrochemical Performance and Electric Field Response of Carbon Fiber Marine Composite Electrode Modified by Electropolymerization of Aniline in Ammonium Bicarbonate Solution

作　　者：田翔 孙久哲 付玉彬[1] Tian Xiang;Sun Jiuzhe;Fu Yubin(School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学材料科学与工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2025年第1期118-129,共12页Periodical of Ocean University of China

基　　金：国家科技创新特区项目(22-TQ02-02-ZT-01-028)资助。

摘　　要：本文应用碳酸氢铵弱碱性溶液作为电解质电化学原位聚合苯胺制备聚丙烯腈基碳纤维海洋电极,研究其电化学性能与电场响应性能。结果表明,碳纤维表面生成还原态聚苯胺并出现特征氧化还原峰;交流阻抗谱表明改性电极表面等效电路增加了膜电容和膜电阻,电场响应由纯电容耦合改变为电容电阻共同作用的混合机制,有利于低频低强度信号的响应。在电场响应测试中,改性电极电位漂移量达0.66 mV/d;能够较好响应10 mV,10 mHz的低频率低强度电场信号;线性度最小值为0.072%。水流冲刷4h后聚苯胺膜质量损失为6.30%,相比于盐酸溶液电聚合制得的聚苯胺膜(质量损失7.55%)具有更好的结合力。该海洋电极可望成为新一代低成本、高性能电场传感器。Carbon fiber electric field electrodes have the advantages of low cost,good chemical stability,and tunable performance,which can be used to develop high-performance ocean electric field sensors.In this paper,surface modification of polyacrylonitrile based carbon fiber was carried out by in-situ electrochemical polymerization of aniline by using ammonium bicarbonate weakly basic solution as electrolyte to fabricate marine composite electrode,and its electrochemical and electric field response performance were studied respectively.The results showed that reduced polyaniline formed on the surface of carbon fiber,in which it appeared characteristic redox peaks.The AC impedance spectrum showed that the modified electrode surface equivalent circuit increased the film capacitance and film resistance,and the electric field response changed from pure capacitance coupling to a hybrid mechanism of capacitance and resistance.It was beneficial to the response of low frequency and low intensity signals.In the electric field performance test,the electric potential drift of the modified electrode pair was as low as 0.66 mV/d,and it induced well to low frequency and low intensity electric field signal at 10 mV,10 mHz,in which its the minimum linearity was 0.072%.The mass loss of polyaniline film after the scour of water was 6.30%,compared with the polyaniline film electropolymerized in hydrochloric acid solution(mass loss 7.55%),it may have better binding force.So the polyaniline modified carbon fiber composite electrode would be utilized to develop a new generation of low-cost,high-performance electric field sensors.

关 键 词：碳纤维电极 聚苯胺 碳酸氢铵 电化学性能 海洋电场响应 

分 类 号：P716[天文地球—海洋科学] TP212[自动化与计算机技术—检测技术与自动化装置]