肖海舰,宋玉苏,李红霞.碳材料改性的Ag/AgCl海洋电场探测电极的孔隙率研究[J].表面技术,2023,52(9):368-376, 429.
XIAO Hai-jian,SONG Yu-su,LI Hong-xia.Porosity of Ag/AgCl Marine Electric Field Detection Electrode Modified by Carbon Material[J].Surface Technology,2023,52(9):368-376, 429 |
| 碳材料改性的Ag/AgCl海洋电场探测电极的孔隙率研究 |
| Porosity of Ag/AgCl Marine Electric Field Detection Electrode Modified by Carbon Material |
| 投稿时间：2022-06-29 修订日期：2023-04-09 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.033 |
| 中文关键词: 碳材料 石墨烯 孔隙率 海洋电场电极 Ag/AgCl电极 |
| 英文关键词:carbon materials graphene porosity ocean electric field electrode Ag/AgCl electrode |
| 基金项目:海军工程大学自主研发项目(2022501100) |
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| 中文摘要: |
| 目的 制备石墨烯、活性炭及碳纤维改性Ag/AgCl海洋电场探测电极，研究改性电极的孔隙率变化及孔隙率对电极极差性能的影响。方法 首先将3种碳材料与Ag粉、AgCl粉末混合，并采用粉压法将其压制烧结成电极，并对电极进行吸水率测试、孔隙率计算、极差测试以及表面形貌观察。结果 经过石墨烯改性的电极性能提升最明显，吸水率可达0.026，孔隙率可达4.15%，相比于未改性的电极(吸水率0.003，孔隙率0.071%)有较大的提高，且极差减小至0.072 mV，极差稳定时间缩短至约3 h。采用超景深三维显微系统对4种电极表面形貌进行观察，石墨烯、活性炭的加入有效提高了电极表面孔的数量以及微观高度差的大小，GO-Ag/AgCl电极的表面孔洞较大且分布均匀，微观高度差达到41.27 μm。结论 孔隙率与电极极差、极差稳定时间有较大的相关性，在一定范围内，孔隙率越大，电极极差越稳定且越小，极差稳定时间越小，且石墨烯的引入可有效提升Ag/AgCl电极的孔隙率，对其极差性能有较大提高。 |
| 英文摘要: |
| Ocean electric field detection technology is to detect weak low-frequency electric field signals in the ocean through electrode pairs. At present, Ag/AgCl electrode pairs are widely used. Since the stability of electrode potential of Ag/AgCl electrode pairs is related to the state of electrode/electrolyte interface, the more stable the state of electrode/electrolyte interface is, the more stable its potential is, the better the electrode performance will be. Theoretically, after the medium enters the internal pores of the electrode, the electrode/electrolyte interface will be less disturbed by the outside world. Therefore, increasing the opening porosity of the electrode will help to improve the adsorption capacity and adsorption rate of the electrode to the medium, so as to improve the potential stability of the electrode and shorten the potential stability time. Carbon materials have many advantages such as good electrical conductivity and large specific surface area. The work aims to study the effect of carbon materials on the open porosity of electrode and the effect of electrode open porosity on the performance of electrode potential difference. After Ag powder and AgCl powder were mixed uniformly in a certain ratio, the same mass of graphene, carbon fiber, and activated carbon were weighed and added into the mixed Ag/AgCl powder, respectively, and the powder was pressed and sintered into an electrode by powder pressing, and its water uptake was tested by an electronic analytical balance (Mettler AG, Switzerland) with an accuracy of 0.1 mg, and then the electrode porosity was calculated by the medium soaking method. After that, five half benchtop multimeters (MS8050) were used to test the potential difference between different carbon material modified electrodes. Their surface morphologies and surface height differences were observed with a super field deep 3D microscope system (VHX-5000). The performance of the electrode modified by graphene was most obviously improved, with water absorption up to 0.026 and porosity up to 4.15%. Compared with the unmodified electrode (water absorption 0.003 and porosity 0.071%), the potential difference was reduced to 0.072 mV, and the potential stability time was shortened to about 3 h. The surface morphology of the four electrodes was observed by the ultra-depth of field three-dimensional microscope system. The addition of graphene and activated carbon effectively increased the number of pores on the electrode surface and the size of the micro height difference. The results indicated that the surface of graphene modified electrode had large and uniform graphene pores, and the micro height difference reached 41.27 μm. The porosity has a great correlation with the potential difference of the electrode pairs and the potential stabilization time. In a certain range, the greater the porosity, the more stable the electrode potential. The smaller the potential difference, the shorter the potential stabilization time. The introduction of graphene can effectively increase the porosity of Ag/AgCl electrode, greatly improve its performance, and meet the requirements of rapid deployment and real-time measurement in military. It provides a reference for the subsequent study of electrode modification and electrode porosity. |
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