Wood-derived biochar as thick electrodes for high-rate performance supercapacitors

• Published in: Biochar (Online) Vol. 4; no. 1; pp. 1 - 19
• Main Authors: Yan, Bing, Zheng, Jiaojiao, Feng, Li, Du, Cheng, Jian, Shaoju, Yang, Weisen, Wu, Yimin A., Jiang, Shaohua, He, Shuijian, Chen, Wei
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.12.2022; Springer
• Subjects: Agriculture; Biochar; Ceramics; Composites; Earth and Environmental Science; Environment; Environmental Engineering/Biotechnology; Fossil Fuels (incl. Carbon Capture); Glass; Heteroatom doping; High mass-loading; Natural Materials; Original Research; Renewable and Green Energy; Self-standing electrodes; Soil Science & Conservation; Supercapacitor; High mass-loading; Supercapacitor; Biochar; Heteroatom doping; Self-standing electrodes
• ISSN: 2524-7972; 2524-7867
• DOI: 10.1007/s42773-022-00176-9

Developing effective electrodes with commercial-level active mass-loading (> 10 mg cm −2 ) is vital for the practical application of supercapacitors. However, high active mass-loading usually requires thick active mass layer, which severely hinders the ion/electron transport and results in poor capacitive performance. Herein, a self-standing biochar electrode with active mass-loading of ca. 40 mg cm −2 and thickness of 800 µm has been developed from basswood. The basswood was treated with formamide to incorporate N/O in the carbon structure, followed by mild KOH activation to ameliorate the pore size and introduce more O species in the carbon matrix. The as-prepared carbon monoliths possess well conductive carbon skeleton, abundant N/O dopant and 3D porous structure, which are favorable for the ion/electron transport and promoting capacitance performance. The self-standing carbon electrode not only exhibits the maximum areal/mass/volumetric specific capacitance of 5037.5 mF cm −2 /172.5 F g −1 /63.0 F cm −3 at 2 mA cm −2 (0.05 A g −1 ), but also displays excellent rate performance with 76% capacitance retention at 500 mA cm −2 (12.5 A g −1 ) in a symmetric supercapacitor, surpassing the state-of-art biomass-based thick carbon electrode. The assembled model can power typical electron devices including a fan, a digital watch and a logo made up of 34 light-emitting diodes for a proper period, revealing its practical application potential. This study not only puts forward a commercial-level high active mass-loading electrode from biomass for supercapacitor, but also bridges the gap between the experimental research and practical application. Graphical abstract Article Highlights Basswood-derived free-standing thick carbon electrodes were developed for supercapacitors. The capacitance performance was enhanced by pre-oxidation, solvothermal treatment and KOH activation. Supercapacitors assembled from the optimized electrode exhibited good rate performance and stability.