Advanced Institute of Convergence Technology (AICT), Seoul National University, Suwon 16229, Republic of Korea.
Department of Biotechnology, Sangmyung University, 20 Hongjimun 2-Gil, Jongno-Gu, Seoul 03016, Republic of Korea; Department of Bio-Convergence Engineering, Dongyang Mirae University, 445-8, Gyeongin-ro, Guro-gu, Seoul 08221, Republic of Korea.
J Environ Sci (China). 2025 May;151:410-423. doi: 10.1016/j.jes.2024.03.039. Epub 2024 Mar 29.
Microalgae are one of the promising feedstocks for biorefinery, contributing significantly to net-zero emissions through carbon capture and utilization. However, the disposal of microalgal byproducts from the manufacturing process causes additional environmental pollution, thus, a new application strategy is required. In this study, the Tetraselmis suecica byproduct from the carotenoid extraction process was carbonized and converted into biochar. The converted biochar was proved to be nitrogen-doped biochar (NDB), up to 4.69%, with a specific surface area of 206.59 m/g and was used as an electrode for a supercapacitor. The NDB electrode (NDB-E) in half-cell showed a maximum specific capacitance of 191 F/g. In a full-cell test, the NDB-E exhibited a high energy density of 7.396 Wh/kg and a high-power density of 18,100 W/kg, and maintained specific capacity of 95.5% after charge and discharge of 10,000 cycles. In conclusion, our study demonstrated that the carotenoid-extracted microalgal byproducts are a useful resource for the supercapacitor production. This approach is the first to convert T. suecica into active materials for supercapacitors.
微藻是生物炼制中很有前途的原料之一，通过碳捕获和利用，对实现净零排放做出了重大贡献。然而，微藻制造过程中的副产物的处理会造成额外的环境污染，因此需要新的应用策略。在本研究中，从类胡萝卜素提取过程中获得的杜氏盐藻副产物被碳化并转化为生物炭。证明转化后的生物炭为氮掺杂生物炭（NDB），高达 4.69%，比表面积为 206.59 m/g，并用作超级电容器的电极。半电池中的 NDB 电极（NDB-E）显示出最大比电容为 191 F/g。在全电池测试中，NDB-E 表现出 7.396 Wh/kg 的高能量密度和 18,100 W/kg 的高功率密度，在经过 10,000 次充放电循环后，比容量保持在 95.5%。总之，我们的研究表明，从类胡萝卜素提取的微藻副产物是超级电容器生产的有用资源。这种方法首次将杜氏盐藻转化为超级电容器的活性材料。
