摘要
碳纤维用做溶氧型海水电池(DO-SWB,Dissolved Oxygen-Seawater Battery)正极材料已取得商业化应用,但海水中溶解氧浓度低和材料氧还原反应(ORR,oxygen reduction reaction)活性低制约着电池功率密度的提高,炭材料的氮掺杂近年来备受关注。本工作以苯胺为氮源,采用一步法在苯胺(An,Aniline)和硫酸混合液中对聚丙烯腈碳纤维(PAN-CF,Polyacrylonitrile-based Carbon Fiber)进行电化学处理,调控工艺条件制备掺氮电极。采用扫描电镜(SEM,Scanning Electron Microscope)、拉曼光谱(Raman,Raman spectrum)和X射线光电子能谱(XPS,Xray Photoelectron Spectroscope)进行表征,结合电化学测试方法对电极表面特征及ORR活性评价,并对作用机理分析。电化学改性使碳纤维表面产生缺陷并生成吡啶类官能团,有效调控了炭材料的电子结构,增加了电极表面活性位点的数量,改善了氧的吸附和电荷转移能力,使掺氮后电极具有优良的ORR性能。其中,最佳性能电极ORR起始电位为-0.12 V vs SCE,在-0.4 V vs SCE下比电流密度达510 mA/g,作为溶氧型海水电池正极具有可期的应用前景。
Carbon fiber has been commercially applied as a cathode material in dissolved oxygen-seawater batteries(DOSWB).However,the low concentration of dissolved oxygen in seawater and the limited activity of the oxygen reduction reaction(ORR)restrict the improvement of battery power density.In recent years,nitrogen doping of carbon materials has attracted significant research interest.In this work,aniline(An)was used as the nitrogen source,and nitrogen-doped electrodes were prepared via a one-step electrochemical treatment of polyacrylonitrile-based carbon fiber(PAN-CF)in a mixed solution of An and H_(2)SO_(4) under optimized process conditions.The electrodes were characterized using scanning electron microscopy(SEM),Raman spectrum(Raman),and X-ray photoelectron spectroscopy(XPS),combined with electrochemical testing methods to evaluate the surface characteristics and ORR activity of the electrodes,followed by an analysis of the underlying mechanism.Electrochemical modification introduced defects on the carbon fiber surface and generated pyridinic functional groups,effectively regulating the electronic structure of the carbon material,increasing the number of active sites on the electrode surface,and enhancing oxygen adsorption and charge transfer capabilities.As a result,the nitrogen-doped electrode exhibited excellent ORR performance.The optimal electrode achieved an ORR onset potential of−0.12 V vs SCE and an ORR specific current density of 510 mA/g at−0.4 V vs SCE,indicating promising application prospects as a cathode material for DO-SWB.
作者
班晓倩
王凯
芦永红
徐海波
BAN Xiaoqian;WANG Kai;LU Yonghong;XU Haibo(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China)
出处
《燃料化学学报(中英文)》
北大核心
2025年第8期1183-1190,共8页
Journal of Fuel Chemistry and Technology
基金
国家重点研发计划(2022YFC2803800)资助。
关键词
溶氧型海水电池
电化学改性
碳纤维正极
氮掺杂
氧还原反应
dissolved oxygen seawater battery
electrochemical modification
carbon fiber
nitrogen doping
oxygen reduction reaction
