Biochar has excellent electrochemical properties and is an ideal renewable green material for many types of energy storage equipment. Nevertheless, most of the biochar materials currently reported as supercapacitor electrodes require a great specific surface area above 1000 m²/g. Here, we first reported the use of two forestry wastes, extracted residue of lacquer wax (RP) and Acer truncatum husk (ATH), as biomass raw materials for pre-carburization at 400 °C. After impregnating potassium ferricyanide, a higher temperature heat treatment is carried out to realize the simultaneous activation of pore formation, catalytic graphitization and hetero-element doping. The specific surface area of activated carbon from the extracted residue of lacquer wax (ACRP) activated at 650 °C was only 311 m²/g, but its specific capacitance reached 324 F/g at a current density of 0.2 A/g. And after 3000 cycles, the capacitance retention rate of the prepared working electrode also reached over 97%, indicating that it has an excellent cycle performance. This study provides a feasible technical route and strategy for the preparation of carbon materials with low specific surface area and high electrochemical performance in a three-electrode system.

Biochar具有出色的电化学性能，是多种类型的储能设备的理想可再生绿色材料。然而，目前报告为超级电容器电极的大多数生物炭材料都需要1000 m ² / g以上的较大比表面积。在这里，我们首先报告了两种林业废料的使用：漆蜡（RP）的提取残留物和元宝枫壳（ATH），作为在400°C下预碳化的生物质原料。浸渍铁氰化钾后，进行较高温度的热处理，以实现孔形成，催化石墨化和异质元素掺杂的同时活化。在650°C下活化的漆蜡（ACRP）提取残留物中的活性炭比表面积仅为311 m ²/ g，但其比电容在0.2 A / g的电流密度下达到324 F / g。并且在3000次循环之后，所制备的工作电极的电容保持率也达到了97％以上，表明其具有优异的循环性能。本研究为在三电极体系中制备低比表面积和高电化学性能的碳材料提供了可行的技术路线和策略。