海带基微孔/介孔复合多级孔纳米炭的制备及电化学性能研究

Study on Synthesis and Electrochemical Performance of Micro-Mesoporous Nano-Carbon Derived from Seaweed as Electrode Material for Supercapacitors

以新鲜海带为前驱体,通过清洗、酸化和高温炭化过程制备了微孔/介孔复合多级孔炭纳米材料。采用SEM,TEM,N2吸脱附,Raman光谱和电化学测试对其结构和电化学性能进行了表征,结果表明海带基多孔炭性能好于商业活性炭,800℃焙烧获得的多孔炭材料具有最大的比表面积(1703.97 m2/g)和最佳的电化学性能,其在4 M的KOH电解液中,5 A/g电流密度下比电容高达200 F/g,并表现出极佳的循环稳定性。这可归因于高的比表面积和独特的微/介孔复合孔结构。

The fresh seaweed is used as a natural precursor to prepare micro-mesoporous nano-carbon materials. The micro-mesoporous carbon was synthesized by washing, acidification and carbonization at different temperatures. The synthesized hierarchical micro-mesoporous carbon was characterized by SEM, TEM, BET, Raman and electrochemical measurement techniques. The results confirmed that such micro-mesoporous carbon possessed higher electrochemical capacitance than commercial active carbon. The porous carbons activated at 800?C present high surface area (up to 1703.97 m2/g) and high specific capacitance of 200 F/g at a current density of 5 A/g, and superior cycling stability in a 4 M KOH aqueous solution. The good capacitive performance can be ascribed to the high specific surface area and well-controlled micro- and mesoporosity.