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LU Yonghong, YANG Lulu, ZHANG Yue, ZHAO Qing, SANG Lin, DING Fei, XU Haibo. Influence of simulating deep-sea environmental factors on cathodic performance of seawater battery[J]. HaiyangYuHuZhao, 2020, 38(2): 334-341

Influence of simulating deep-sea environmental factors on cathodic performance of seawater battery

LU Yonghong1, YANG Lulu1, ZHANG Yue1, ZHAO Qing2, SANG Lin2, DING Fei2, XU Haibo1,
1 College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;
2 National Key Laboratory of Science and Technology on Power Sources, Tianjin Institute of Power Sources, Tianjin 300084, China
A metal-dissolved oxygen seawater battery (SWB) uses metal and dissolved oxygen as the reactants, and it is ideal for use as a long-time low-power distributed power supply in deep sea, due to its advantages of open structure in service without electrolyte. However, several simulating deep-sea environmental factors, such as flow rate, dissolved oxygen concentration, and temperature of seawater may affect the oxygen reduction reaction (ORR) rate and the stability of electrochemically modified polyacrylonitrile-based carbon fiber brush (MPAN-CFB) cathode, which was studied by steady-state polarization and galvanostatic discharge methods. In addition, the scales formed on MPAN-CFB surface were characterized by SEM and XRD. Results show that the ORR rate increased quickly with the increase of the seawater flow rate up to 3 cm/s, and then gradually stabilized. Moreover, the ORR rate was largely affected by dissolved oxygen concentration, and the concentration of >3 mg/L was favorable. Compared with surface layer temperature of 15℃, the low temperature of deep sea (4℃) has a negligible effect on ORR rate. When the working current is too high, it will lead to the formation of CaCO3 scales (aragonite) of at the cathodic surface, resulting in the decrease of ORR rate, and consequently the damage to the long-time stability of MPAN-CFB.
Key words:    seawater battery (SWB)|deep sea|modified polyacrylonitrile-based carbon fiber brush (MPANCFB)|oxygen reduction reaction (ORR)|scale formation   
Received: 2019-04-15   Revised: 2019-05-20
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