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      Oxidation Modification of Polyacrylonitrile-Based Carbon Fiber and Its Electro-Chemical Performance as Marine Electrode for Electric Field Test

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          A novel sensor for ocean electric field testing has been fabricated by polyacrylonitrile-based on carbon fibers with electro-chemical oxidation. The surface profile characteristics of the carbon fibers were characterized by scanning electron microscope, Fourier transform infrared spectra and contact angle. Cyclic voltammetry and Tafel curves have been used to study its electrochemical performances. Two identical electrodes in sea water as the electric field sensor will swiftly respond to applied electric field which causes positive and negative ions to move in opposite direction, resulting in a electric potential difference (ΔE). Test result indicates that the offset potential is typically below 1 mV with a drift of 60–170 µV d –1. Typical self noise level is 1.07 nV/√Hz@1Hz . The electric field response indicates that the modified electrode pair shows better response to AC sine signal of amplitude and frequency (5 mV and 1 mHz) respectively than its blank. The electric field response model of the modified electrodes is creatively presented according to its electric double layer capacitance and Faraday pseudo-capacitance. Many advantages of the carbon fiber electric field electrode will make it have potential application prospect.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          24 January 2020
          01 April 2020
          : 19
          : 2
          : 361-368
          1College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
          2School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
          Author notes
          *Corresponding author: FU Yubin, Tel: 0086-532-66782752, E-mail: ffyybb@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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