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“Water-in-salt” electrolyte enhanced high voltage aqueous supercapacitor with carbon electrodes derived from biomass waste-ground grain hulls
RSC Advances ( IF 3.9 ) Pub Date : 2020-9-25 , DOI: 10.1039/d0ra07448a Mingjun Pang 1 , Shang Jiang 1 , Jianguo Zhao 1 , Sufang Zhang 1 , Runwei Wang 2 , Ning Li 1 , Rui Liu 1 , Qiliang Pan 1 , Wenshan Qu 1 , Baoyan Xing 1
RSC Advances ( IF 3.9 ) Pub Date : 2020-9-25 , DOI: 10.1039/d0ra07448a Mingjun Pang 1 , Shang Jiang 1 , Jianguo Zhao 1 , Sufang Zhang 1 , Runwei Wang 2 , Ning Li 1 , Rui Liu 1 , Qiliang Pan 1 , Wenshan Qu 1 , Baoyan Xing 1
Affiliation
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To design high specific surface area and optimize the pore size distribution of materials, we employ a combination of carbonization and KOH activation to prepare activated carbon derived from ground grain hulls. The resulting carbon material at lower temperature (800, BSAC-A-800) exhibits a porous structure with a high specific surface area of 1037.6 m2 g−1 and a pore volume of 0.57 m3 g−1. Due to the synergistic structural characteristics, BSAC-A-800 reveals preferable capacitive performance, showing a specific capacitance as high as 313.3 F g−1 at 0.5 A g−1, good rate performance (above 73%), and particularly stable cycling performance (99.1% capacitance retention after 10 000 cycles at a current density of 10 A g−1). More importantly, the assembled symmetric supercapacitor using a water-in-salt electrolyte (17 m NaClO4) with high discharge specific capacitance (59 F g−1 at 0.5 A g−1), high energy density (47.2 W h kg−1) and high voltage (2.4 V) represents significant progress towards performance comparable to that of commercial salt-in-water electrolyte supercapacitors (with discharge specific capacitance of 50 F g−1, energy densities of ∼28.1 W h kg−1 and voltages of 2.0 V).
中文翻译：
“盐包水”电解质增强型高压水系超级电容器，其碳电极取自生物质废物磨碎的谷壳
为了设计高比表面积并优化材料的孔径分布，我们采用碳化和 KOH 活化相结合的方法来制备源自磨碎谷物壳的活性炭。所得碳材料在较低温度（800，BSAC-A-800）下表现出具有1037.6 m 2 g -1的高比表面积和0.57 m 3 g -1的孔体积的多孔结构。由于协同的结构特性，BSAC-A-800表现出良好的电容性能，在0.5 A g -1时比电容高达313.3 F g -1 ，倍率性能良好（73%以上），循环性能特别稳定（在10 A g -1的电流密度下10 000次循环后电容保持率为99.1%）。更重要的是，使用盐包水电解质（17 m NaClO 4 ）组装的对称超级电容器具有高放电比电容（0.5 A g -1时为59 F g -1 ）、高能量密度（47.2 W h kg -1 ）和高电压（2.4 V）代表了与商用水包盐电解质超级电容器（放电比电容为 50 F g −1 ，能量密度为 ∼28.1 W h kg −1 ，电压为2.0V）。
更新日期：2020-09-25
中文翻译：
“盐包水”电解质增强型高压水系超级电容器，其碳电极取自生物质废物磨碎的谷壳
为了设计高比表面积并优化材料的孔径分布，我们采用碳化和 KOH 活化相结合的方法来制备源自磨碎谷物壳的活性炭。所得碳材料在较低温度（800，BSAC-A-800）下表现出具有1037.6 m 2 g -1的高比表面积和0.57 m 3 g -1的孔体积的多孔结构。由于协同的结构特性，BSAC-A-800表现出良好的电容性能，在0.5 A g -1时比电容高达313.3 F g -1 ，倍率性能良好（73%以上），循环性能特别稳定（在10 A g -1的电流密度下10 000次循环后电容保持率为99.1%）。更重要的是，使用盐包水电解质（17 m NaClO 4 ）组装的对称超级电容器具有高放电比电容（0.5 A g -1时为59 F g -1 ）、高能量密度（47.2 W h kg -1 ）和高电压（2.4 V）代表了与商用水包盐电解质超级电容器（放电比电容为 50 F g −1 ，能量密度为 ∼28.1 W h kg −1 ，电压为2.0V）。
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