Key Lab of Biomass Energy and Material, Jiangsu Province, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, 210042, P. R. China.
State Key Laboratory of Biobased Material & Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250353, P. R. China.
ChemSusChem. 2023 Jul 7;16(13):e202202393. doi: 10.1002/cssc.202202393. Epub 2023 May 31.
Supercapacitors with the performance advantages of high-power density are emerging materials for energy storage/conversion systems that can combat climate change caused by CO emissions and are of importance with the development of electronic products and artificial intelligence. But rationally preparing high-performance electrode with high mass-loading quantity remains challenge. Herein, we have opted for chitosan as well-structured binding agent to combine with active carbon (SSP-900), a 3D hierarchical micro-meso-macro porous biochar previously obtained, to synthesize high mass-loading freestanding electrode. Especially, the freestanding material (C G ), owning 0.2 g SSP-900 and suffering carbonization at 1000 °C exhibits high specific surface area of 389.3 cm g , and self-doped N, O (2.75 %, 5.64 %). That awards C G outstanding electrochemical properties, including high specific mass capacitance of 199.2 F g , splendid specific area capacitance of 4.37 F cm in 21.93 g cm , which is more competitive than conventional freestanding materials. Symmetrical supercapacitor with mass loading of 12 mg is assembled and exhibits large specific capacitance of 65 F g , high energy density of 32.5 Wh kg under the power density of 90.4 W kg , and capacitance stability of 98 % after 10,000 cycles. The distinguished electrochemical performance of freestanding electrodes supplies prospective application for storing/converting electrical energy from intermittent solar and wind.
超级电容器具有高功率密度的性能优势，是用于储能/转换系统的新兴材料，可以应对 CO 排放引起的气候变化，随着电子产品和人工智能的发展，具有重要意义。但合理制备具有高负载量的高性能电极仍然是一个挑战。在此，我们选择壳聚糖作为结构良好的结合剂，与先前获得的 3D 分级中孔大孔生物炭 SSP-900 结合，合成高负载量的独立式电极。特别是，独立式材料（C G ），含有 0.2 g SSP-900，并在 1000°C 下碳化，具有 389.3 cm 2 g 的高比表面积和自掺杂的 N、O（2.75%、5.64%）。这使 C G 具有出色的电化学性能，包括 199.2 F g 的高比质量电容和 21.93 g cm 下 4.37 F cm 的高光面积电容，比传统的独立式材料更具竞争力。组装了具有 12 mg 质量负载的对称超级电容器，在 90.4 W kg 的功率密度下表现出 65 F g 的大比电容、32.5 Wh kg 的高能量密度以及 10000 次循环后的 98%的电容稳定性。独立式电极的出色电化学性能为存储/转换间歇性太阳能和风力产生的电能提供了有前景的应用。
