Dual-frequency ultrasonic-assisted enzymolysis for synthesis of microstructure regulated biomass-derived porous carbon for high-performance supercapacitors

作者：Zhaocai Teng, Kuihua Han, Meimei Wang, Jianhui Qi, Jiangwei Liu, Yingjie Li · 发表于：Ultrasonics Sonochemistry · 年份：2024 · DOI：10.1016/j.ultsonch.2024.107213 · 被引用次数：18 · 研究领域：Supercapacitor Materials and Fabrication、Catalysis for Biomass Conversion、Biofuel production and bioconversion

• Ultrasonic-assisted enzymolysis was used to prepare garlic peel derived porous carbon. • Ultrasound and cellulase synergistically regulate the microstructure of garlic peel. • The auxiliary effect of dual-frequency ultrasound is superior to single-frequency. • Modified garlic peel-based porous carbon delivers excellent capacitive performance. • The assembled organic supercapacitor exhibits ultra-high energy density. Biomass-derived porous carbon (PC) has emerged as a promising candidate for electrode materials in energy storage applications, effective pretreatment of the precursor is a key strategy for enhancing the electrochemical performance of PC. However, challenges remain in achieving this goal through environmentally friendly, simple, and efficient methods. In this paper, a dual-frequency ultrasonic-assisted enzymolysis strategy combined with carbonization-activation method was proposed to prepare high-performance garlic peel-derived PC (DUGPC) for supercapacitors. Gentle and effective sonobiocatalysis facilitates microstructural regulation and composition management of the precursor, granting DUGPC an impressive specific surface area (SSA, 3006 m 2 /g), improved pore distribution, low metal impurity content (less than 100 ppm) and high wettability. As anticipated, DUGPC demonstrates excellent specific capacitance (408.77 F/g at 1 A/g) and rate performance (retention is 81.8 % at 50 A/g) surpassing most recently reported biomass-based PCs. In addition, the assembled a...