基于“蛋盒”结构高电化学性能分级多孔炭的制备

• 作 者: 李诗杰 张明阳 高岩 李辉 王茜 张林华
• 机 构: 山东建筑大学 热能工程学院,山东 济南 250101
• 出 处: 新型炭材料
• 发表日期: 2021年6期
• 关键词: Egg-box structure Hierarchical porous carbon Mesopores Electrochemical property

基于浒苔中海藻酸钙的“蛋盒”结构,对浒苔炭化产物进行盐酸酸洗处理,去除海藻酸钙中的钙离子,形成“蛋盒”式初始孔结构.以酸洗处理后的炭化产物为前驱体,采用KOH活化法制备浒苔基分级多孔活性炭,并研究活性炭的孔结构特性及电化学性能.研究表明:浒苔基活性炭具有分级多孔结构,其比表面积(SBET)高达3283 m2 g?1,其中介孔提供了66％以上的比表面积.当用作超级电容器电极材料时,即使在较高的电流密度下,浒苔基活性炭也表现出优异的电化学性能.当电流密度为0.1 A g?1时,浒苔基活性炭的比电容为361 F g?1,当电流密度增大至10 A g?1时,活性炭的比电容仍然高达323 F g?1,表现出优异的高倍率性能.“,”Enteromorpha prolifera (EP) was carbonized, treated by HCl pickling to remove Ca2+ ions to form an “egg-box” struc-ture, and activated by KOH to obtain a porous carbon (PC). The porous texture and electrochemical performance of the PC were compared with one produced without the HCl pickling stage. Results indicate that the HCl treatment leads to the formation of a por-ous structure with a high specific surface area (SBET), up to 3283 m2 g?1, with more than 66％ of the surface area contributed by meso-pores, while the carbon prepared without HCl treatment is microporous. The PC with the HCl treatment had an excellent electro-chemical performance when used as the electrode material of a supercapacitor even at high current densities. Its gravimetric capacit-ance reached 361 F g?1 at a current density of 0.1 A g?1, and the capacitance remained at 323 F g?1 at a current density of 10 A g?1, both of which are higher than obtained using the PC without HCl treatment.