氯化钠模板诱导木质素基多孔炭的制备及其超级电容器性能

以木质素为碳源,氯化钠为模板,通过低温回流使木质素包覆在氯化钠外层,高温煅烧获得木质素基多孔炭,研究了其作为电极材料在超级电容器中的应用。 结果表明,改变煅烧温度可调控所得样品的孔结构,其比表面积在548~600 m²/g之间可变,且随着煅烧温度升高,比表面积和孔体积先增大后减少。 700 ℃煅烧所得样品具有最大的比表面积,并表现出最高的电容性能,其在6 mol/L KOH电解液中比电容可达252 F/g,有效面积电容高达31.2 μF/cm²,模板氯化钠可清洗分离并可循环利用。 提出了一种废弃物高附加值制备超级电容器用多孔炭的绿色方法。

Synthesis of Sodium Chloride Induced Lignin-Based Porous Carbon and Their Supercapacitor Performances

A novel class of lignin-based porous carbon(PC) for supercapacitor electrode was successfully fabricated using lignin as the carbon precursor and NaCl as the template by reflux at low temperature and calcination at high temperature. The results indicate that the porous structures of the obtained samples can be regulated by varying the calcination temperature, where the surface area and pore volume of samples firstly increases then decreases with the increase of the temperature. As a result, the specific surface area of the obtained sample can be tailored in the range of 548~600 m²/g. PC calcinated at 700 ℃ has the largest surface area and exhibits the highest specific capacitance of 252 F/g and an effective areal capacitance of 31.2 μF/cm² in 6 mol/L KOH solution. NaCl template can be cycled by washing from the products. This paper proposes a green method for synthesis of high value-added porous carbon from waste materials.