仿鲨鱼电场探测镍酸钐膜电极海水稳定性及电化学性能分析

Analysis of Seawater Stability and Electrochemical Properties of Perovskite Nickelate Film Electrode of Shark-Mimetic Detection for Ocean Electric Field

本文使用两种厚度镍酸钐膜(30、60 nm),在实海长期浸泡,研究实际稳定性和电化学性能。结果表明镍酸钐膜在海水中长期浸泡,局部有溶蚀现象,对应样品存在失重。循环伏安曲线存在明显的氧化还原峰,30 nm SNO样品氧化还原峰与60 nm SNO样品出峰位置相差约0.2 V,30 nm SNO样品比60 nm SNO样品的交换电流密度大一个数量级,可知30 nm SNO样品电子转移活性更高,更容易发生氧化还原反应。交流阻抗测试结果表明样品存在巨大的电阻变化,30 nm SNO样品比60 nm SNO样品反应更快,电子转移电阻更小。配对电极电场响应测试结果表明响应波形不规则、且漂移较大,两种厚度样品均未能正常响应。

SmNiO 3(SNO)film is a kind of new type of electric field test sensitive material,which can be developed as a shark-mimetic ocean electric field sensor.Two various thick SNO films(30 nm,60 nm)were respectively used to investigate its actual stability in seawater and electrochemical properties.The results showed that SNO film immersed in seawater partially dissolved to cause weight loss.Significant redox peaks presented in their cyclic voltamian curves,in which the redox peak in 30 nm SNO samples was about 0.2 V away from the 60 nm SNO samples,and it presented an order of magnitude higher the exchange current density than 60 nm SNO samples,indicated a higher electron transfer activity of 30 nm SNO samples and was more prone to redox reactions.The results of AC impedance test showed that there occur larger resistance variations in all samples,and the 30 nm SNO samples responded faster and had less electron transfer resistance than the 60 nm SNO samples.The electric field response test results showed that the response waveform is irregular,and there were much larger drift comparing with applied electric field.and both thickness samples failed to respond normally.This paper analyzed the potential problems and feasibility of SNO as a practical electric field test equipment.