利用三嵌段共聚物P123作为软模板,植酸为P源,葡萄糖为碳源,经简单的水热法和 KOH 高温刻蚀,制备磷掺杂的三维多孔活性碳材料.SEM和TEM表明,经水热和碳化两个步骤处理后,得到的活性碳材料外表层为开放的大孔,内部则分布为大量介孔和微孔,形成孔嵌套的多层密集孔隙结构.红外光谱和X射线光电子谱(XPS)分析表明,经过高温刻蚀后P元素成功地保留在碳材料基体中,掺杂 P 后的碳材料电极在1 mol/L KOH电解液中的比电容为235 F/g,远高于AC未掺杂时的182 F/g,经4000次充放电循环后,该 P 掺杂碳电极仍保留初始容量的91％,这表明P掺杂可以提高多孔碳材料的储能密度和循环稳定性.
P-doped porous carbon composite by caustic pyrolysis of copolymer as supercapacitor
A kind of phosphorus-doped composite was prepared by a simple hydrothermal method with poly (eth-ylene glycol)-block-poly (propylene glycol)-block-poly (ethylene glycol)polymer (P123 )as soft template, physic acid as phosphorus source and glucose as carbon source.The composite was then etched by KOH under high temperature to form a three-dimensional microporous structure.SEM and TEM observations shows a typi-cal feature of multi-layer dense hierarchy of micropores with relatively large pores outside and micropores inside the composite,FT-IR and XPS analysis indicates a successful doping of P element.Electrochemical tests indi-cate that the P-doped porous composite has a further high specific capacity up to 235 F/g than the un-doped car-bon materials which is only 182 F/g in 1 mol/L KOH.Besides,it retains excellent charge-discharge reversibility with high capacitance retention up to 90% even after 4 000 cycles.The electrochemical results demonstrate that phosphorus doping can obviously improve the hydrophilicity of electrode surface and pseudo capacitance,mak-ing it possess better electrochemical characteristics.
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