Xin Yi, Liu Chenyang, Cui Meng, Hou Tianyuan, Liu Houyan, Tong Junye, Lin Tingting, Liu Changsheng, Yang Dapeng
College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China.
Rev Sci Instrum. 2021 Sep 1;92(9):095002. doi: 10.1063/5.0056177.
A new type of Ag/AgCl electrode as a marine electric field sensor is prepared using electrospray. The surface of the electrode is porous, and the particle size of AgCl is small and uniform with an average particle size of 1.43 µm, which accelerated the speed of the oxidation-reduction reactions. Therefore, the electrode with large specific surface area has high stability and low noise. The impedance, sensitivity, self-noise, and stability of the electrode are measured to study the electrochemical performance of the electrode. The impedance of the electrode is 7.9 Ω, and the electrode shows resistance characteristics, meaning that the electrode can well receive the weak ocean electric field signals with low signal distortion. The sensitivity experiment result shows that the electrode can well restore the sinusoidal electric field signal of 1 Hz (10 mV). The voltage drift is less than 5 µV/100 h, the self-potential is between -51 and 56 µV, and the self-noise of the electrode is 2.48 nV @ 1 Hz. The AgCl layer on the surface of the electrode is porous and thick, and the particle size of AgCl is small and uniform. This makes the electrode have excellent electrochemical performance. All the experimental results show that the electrode has ultra-low noise and excellent response to low frequency weak electric field signals. The electrode is of great significance to the exploitation of marine resources as the marine electric field sensor.
采用电喷雾法制备了一种新型的Ag/AgCl电极作为海洋电场传感器。电极表面具有多孔结构，AgCl粒径小且均匀，平均粒径为1.43 µm，这加快了氧化还原反应的速度。因此，具有大比表面积的该电极具有高稳定性和低噪声。测量了电极的阻抗、灵敏度、自噪声和稳定性，以研究其电化学性能。该电极的阻抗为7.9 Ω，呈现电阻特性，这意味着该电极能够很好地接收微弱的海洋电场信号，且信号失真小。灵敏度实验结果表明，该电极能够很好地恢复1 Hz（10 mV）的正弦电场信号。电压漂移小于5 µV/100 h，自然电位在-51至56 µV之间，电极在1 Hz时的自噪声为2.48 nV。电极表面的AgCl层多孔且厚，AgCl粒径小且均匀。这使得该电极具有优异的电化学性能。所有实验结果表明，该电极具有超低噪声，对低频微弱电场信号具有优异的响应。作为海洋电场传感器，该电极对海洋资源开发具有重要意义。
