生物质巨菌草衍生炭的合成及在超级电容器中的应用

Synthesis of Biochar Derived from Jujun Grass and the Application in Supercapacitors

将巨菌草低温预碳化处理,得到粉末炭质材料(JPC),再用不同比例的KOH在不同温度下进行活化处理,得到了以微孔和介孔分布为主的无定形炭材料(JPCK1).所合成的炭材料JPCK1-900-4X的比表面积高达3368 m^(2)/g,具有较大的孔隙体积和0.95%(原子分数)的氮含量.电化学测试结果表明,JPCK1-900-4X在超级电容器应用中表现出优异的储能潜力;在电流密度为0.5 A/g时其比电容为311.7 F/g,电流密度提高到10 A/g时比电容为230 F/g;在电流密度为10 A/g时经过5000次充放电循环后其电容保持率为97.5%;在两电极体系下,当功率密度为250 W/kg时,其能量密度可达17.7 W·h/kg.

The powder carbonaceous material(JPC)was obtained by pre-carbonizing Jujun grass at low tempera⁃ture,and then activated with different proportions of KOH at different temperatures,amorphous carbon material(JPCK1)with microporous and mesoporous distribution was obtained.The specific surface area of the synthesized carbon JPCK1-900-4X is up to 3368 m^(2)/g,with large pore volume and 0.95%(atomic percent)nitrogen content.Electrochemical tests showed that JPCK1-900-4X has good energy storage potential in supercapacitor applications.When the current density is 0.5 A/g,the specific capacitance is 311.7 F/g,and when the current density is increased to 10 A/g,the specific capacitance is 230 F/g.After 5000 cycles of charging and discharging at the current density of 10 A/g,the capacitance retention rate is 97.5%,which indicates that it has good stability.In the two-electrode system,when the power density is 250 W/kg,the energy density can reach 17.7 W·h/kg.