Abstract
High-performance porous carbons derived from tea waste were prepared by hydrothermal treatment, combined together with KOH activation. The heat-treatment-processed materials possess an abundant hierarchical structure, with a large specific surface of 2235 m2 g−1 and wetting-complemental hydrophilicity for electrolytes. In a two-electrode system, the porous carbon electrodes’ built-in supercapacitor exhibited a high specific capacitance of 256 F g−1 at 0.05 A g−1, an excellent capacitance retention of 95.4% after 10,000 cycles, and a low leakage current of 0.014 mA. In our work, the collective results present that the precursor crafted from the tea waste can be a promising strategy to prepare valuable electrodes for high-performance supercapacitors, which offers a practical strategy to recycle biowastes into manufactured materials in energy storage applications.
Highlights
Supercapacitors, including electric double-layer capacitors (EDLCs) and pseudocapacitors, have garnered continuous attention as an efficient energy storage system due to their higher power density, superior rate performance, longer cycle life, and a wider range of applications, compared with other energy storage systems [1,2,3,4,5,6,7,8]
We developed a simple method to produce high-quality porous carbon materials derived from tea waste by using hydrothermal treatment, combined together with KOH activation, which is a well-established approach in the preparation of carbon-based electrode materials
With the mass ratios of 1:2, 1:3, and 1:4 were mixed with the deionized water (DIW) and dried for 10 h, and the stock was transferred into a horizontal tube furnace at 800 ◦ C for 1 h with N2 to achieve the activation
Summary
Supercapacitors, including electric double-layer capacitors (EDLCs) and pseudocapacitors, have garnered continuous attention as an efficient energy storage system due to their higher power density, superior rate performance, longer cycle life, and a wider range of applications, compared with other energy storage systems [1,2,3,4,5,6,7,8]. Electrodes play an important role in determining electrochemical performance [9,10,11,12,13]. Activated carbons (ACs) have been used as a conventional material for EDLC electrodes because of their intrinsic characteristic properties, such as high specific surface area, developed pore structure, and suitable surface chemical state [14,15,16]. As a result of the previous studies, it was found that there is great significance and research value in discovering low-cost and high-performance electrode materials by utilizing biowaste. In China, the world’s largest tea-producing country [24], most of the tea waste is discarded as useless material, which leads to environmental pollution and resource waste
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
