Wannasen Likkhasit, Chanlek Narong, Siriroj Sumeth, Maensiri Santi, Swatsitang Ekaphan, Pinitsoontorn Supree
Department of Physics, Faculty of Science, Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), Khon Kaen University, Khon Kaen 40002, Thailand.
Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand.
Nanomaterials (Basel). 2022 Oct 11;12(20):3555. doi: 10.3390/nano12203555.
Activated carbon (AC) from sugarcane bagasse was prepared using dry chemical activation with KOH. It was then subjected to a high-energy ball milling (HEBM) treatment under various milling speeds (600, 1200 and 1800 rpm) to produce AC nanoparticles from micro-size particles. The AC samples after the HEBM treatment exhibited reduced particle sizes, increased mesopore volume and a rich surface oxygen content, which contribute to higher pseudocapacitance. Notably, different HEBM speeds were used to find a good electrochemical performance. As a result, the AC/BM12 material, subjected to HEBM at 1200 rpm for 30 min, exhibited the highest specific capacitance, 257 F g, at a current density 0.5 A g. This is about 2.4 times higher than that of the AC sample. Moreover, the excellence capacitance retention of this sample was 93.5% after a 3000-cycle test at a current density of 5 A g. Remarkably, a coin cell electrode assembly was fabricated using the AC/BM12 material in a 1 M LiPF electrolyte. It exhibited a specific capacitance of 110 F g with a high energy density of 27.9 W h kg.
采用KOH进行干化学活化制备了甘蔗渣活性炭（AC）。然后在不同的研磨速度（600、1200和1800转/分钟）下对其进行高能球磨（HEBM）处理，以从微米级颗粒制备AC纳米颗粒。HEBM处理后的AC样品粒径减小，中孔体积增加，表面氧含量丰富，这有助于提高赝电容。值得注意的是，使用不同的HEBM速度来寻找良好的电化学性能。结果，在1200转/分钟下进行30分钟HEBM处理的AC/BM12材料在电流密度0.5 A/g时表现出最高的比电容，为257 F/g。这大约是AC样品的2.4倍。此外，该样品在5 A/g的电流密度下进行3000次循环测试后的卓越电容保持率为93.5%。值得注意的是，使用AC/BM12材料在1 M LiPF电解质中制备了硬币电池电极组件。它表现出110 F/g的比电容和27.9 W h/kg的高能量密度。
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