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首页> 外文期刊>Ionics >Synthesis of biomass-based porous graphitic carbon combining chemical treatment and hydrothermal carbonization as promising electrode materials for supercapacitors
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Synthesis of biomass-based porous graphitic carbon combining chemical treatment and hydrothermal carbonization as promising electrode materials for supercapacitors

机译：基于生物质基多孔石墨碳的合成，将化学处理和水热碳化为超级电容器的前景电极材料

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A synthesis strategy was developed for preparing porous graphitic carbon with high electrochemical performance from peanut shell through chemical treatment by NH4OH, HNO3, and H2SO4, subsequent hydrothermal carbonization, and ZnCl2 activation under CO2 atmosphere. At a certain activation temperature of 700 degrees C, the carbon sample after NH4OH pretreatment (NHAC-700) achieved the highest specific capacitance of 256.05 F/g at the current density of 0.5 A/g due to its high surface area and good pore size distribution. The porosity and electrochemical performance of NH4OH-pretreated carbon was further improved by improving the activation temperature to 800 degrees C (NHAC-800). The NHAC-800 possessed a large surface area of 2129.5 m(2)/g with a high proportion of mesopores in the pore size range of 2-5 nm. Electrochemical analysis in the three-electrode system showed that NHAC-800 electrode exhibited a high specific capacitance of 266.06 F/g at 0.5 A/g. In the two-electrode system, the symmetric supercapacitor assembled by NHAC-800 delivered an energy density of 32.08 Wh/kg at a power density of 1000 W/kg and maintained 25.63 Wh/kg at 20000 W/kg. NHAC-800 also displayed excellent cycle stability with the capacitance retention rate of 93.76% after 5000 cycles at a constant current density of 2 A/g.
机译：开发了一种合成策略，用于制备具有高电化学性能的多孔石墨碳，通过NH4OH，HNO3和H 2 SO 4，随后的水热碳化和CO 2气氛下的ZnCl2活化来制备来自花生壳的高电化学性能。在700℃的一定的活化温度下，由于其高表面积和良好的孔径，NH4OH预处理（NHAC-700）之后的碳样品以0.5A / g的电流密度实现了256.05 f / g的最高比电容分配。通过将活化温度改善为800℃（NHAC-800），进一步提高了NH4OH-预处理碳的孔隙率和电化学性能。 NHAC-800具有2129.5米（2）/ g的大表面积，孔径范围为2-5nm的高比例。三电极系统中的电化学分析表明，NHAC-800电极在0.5A / g下表现出266.06f / g的高比电容。在两个电极系统中，由NHAC-800组装的对称超级电容器以1000W / kg的功率密度提供32.08WH / kg的能量密度，并在20000 / kg下保持25.63wH / kg。 NHAC-800在5000次循环的恒定电流密度为2A / g的情况下，NHAC-800也显示出优异的循环稳定性，电容保持率为93.76％。

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