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 struct...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 af fect 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 af fected 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 ef fect on ORR rate.When the working current is too high,it will lead to the formation of CaCO_3 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.展开更多
针对微生物燃料电池输出功率低的问题,以碳纤维刷为改性对象,采用原位化学聚合的方法在碳纤维表面生长聚吡咯薄膜,增强电极的生物相容性,有利于产电微生物在电极表面的附着和繁殖;进一步在碳纤维表面引入石墨烯,可提高电极的比表面积和...针对微生物燃料电池输出功率低的问题,以碳纤维刷为改性对象,采用原位化学聚合的方法在碳纤维表面生长聚吡咯薄膜,增强电极的生物相容性,有利于产电微生物在电极表面的附着和繁殖;进一步在碳纤维表面引入石墨烯,可提高电极的比表面积和导电性能。结果表明,在聚吡咯和石墨烯的协同作用下,微生物燃料电池的产电性能得到极大提升,最大输出电压和最大输出功率密度分别能达到0.62 V和900 m W/m^(2),与未改性碳刷相比分别提高了近24%和133%。展开更多
基金Supported by the National Major Scientific Instruments Development Project of the National Natural Science Foundation of China(No.41427803)the Zhuang Fa Yu Yan Program(No.41421020401)
文摘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 af fect 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 af fected 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 ef fect on ORR rate.When the working current is too high,it will lead to the formation of CaCO_3 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.
文摘针对微生物燃料电池输出功率低的问题,以碳纤维刷为改性对象,采用原位化学聚合的方法在碳纤维表面生长聚吡咯薄膜,增强电极的生物相容性,有利于产电微生物在电极表面的附着和繁殖;进一步在碳纤维表面引入石墨烯,可提高电极的比表面积和导电性能。结果表明,在聚吡咯和石墨烯的协同作用下,微生物燃料电池的产电性能得到极大提升,最大输出电压和最大输出功率密度分别能达到0.62 V和900 m W/m^(2),与未改性碳刷相比分别提高了近24%和133%。