He Xin, Chen Qian, Mao Xiling, Liu Weichen, Zhou Yujiu, Yang Wenyao, Yang Yajie, Xu Jianhua
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China No. 4, Section 2, North Jianshe Road Chengdu 610054 P. R. China
Engineering Research Center of Electronic Information Technology and Application, School of Electrical and Electronic Engineering, Chongqing University of Arts and Sciences Chongqing 402160 P. R. China.
RSC Adv. 2019 Sep 30;9(53):30809-30814. doi: 10.1039/c9ra05858c. eCollection 2019 Sep 26.
A novel electrode material incorporating renewable biomass-derived juglone biomolecules with commercial activated carbon (AC) granules has been through simple ultrasonic dispersion and dissolution-recrystallization and was found to exhibit good electrochemical performance. The juglone biomolecules are prepared by an ultrasound-assisted extraction method from abandoned walnut peel, which decreases pollution and increases economic efficiency. Through the dissolution-recrystallization process with AC, a hierarchical structure with nanosized juglone particles was obtained, and the AC particles worked as scaffolding to strengthen the slight biomolecules, thus expanding the active sites and effectively reducing the dissolution of the active materials. The pseudocapacitance fading mechanism was investigated by FTIR measurement and the porous structure ensures that the composite electrode has an enhanced specific capacitance of 248 F g compared to 172.8 and 62.5 F g for the respective AC and juglone samples. Besides, the excellent cyclic stability (retained 75% after 3000 charge-discharge cycles) was demonstrated. The highest area-specific capacitance of the composites was 1300 mF cm. An asymmetric supercapacitor based on this composite electrode was assembled with an AC electrode as the counter electrode and exhibited good cyclic performance at a voltage of 1.2 V (retained 77% after 3000 charge-discharge cycles), which provides a high energy density of 12 W h kg at a power density of 0.18 kW kg and a high power density of 2 kW kg at an energy density of 9 W h kg. This work explores the application of biomolecule-based composites in energy storage devices and provides a potential strategy for constructing environmentally friendly electrodes.
一种将可再生生物质衍生的胡桃醌生物分子与商业活性炭（AC）颗粒相结合的新型电极材料，通过简单的超声分散和溶解-重结晶制备而成，并且被发现具有良好的电化学性能。胡桃醌生物分子是通过超声辅助提取法从废弃核桃皮中制备的，这减少了污染并提高了经济效益。通过与AC的溶解-重结晶过程，获得了具有纳米级胡桃醌颗粒的分级结构，AC颗粒起到支架作用以强化这些微小的生物分子，从而扩大了活性位点并有效减少了活性材料的溶解。通过傅里叶变换红外光谱（FTIR）测量研究了赝电容衰减机制，并且多孔结构确保复合电极具有增强的比电容，与各自的AC和胡桃醌样品的172.8 F/g和62.5 F/g相比，为248 F/g。此外，还展示了优异的循环稳定性（在3000次充放电循环后保留75%）。复合材料的最高面积比电容为1300 mF/cm²。基于这种复合电极组装了一个不对称超级电容器，以AC电极作为对电极，并且在1.2 V的电压下表现出良好的循环性能（在3000次充放电循环后保留77%），在功率密度为0.18 kW/kg时提供12 W h/kg的高能量密度，在能量密度为9 W h/kg时提供2 kW/kg的高功率密度。这项工作探索了基于生物分子的复合材料在储能装置中的应用，并为构建环境友好型电极提供了一种潜在策略。
