A Simple Route to Produce Highly Efficient Porous Carbons Recycled from Tea Waste for High-Performance Symmetric Supercapacitor Electrodes

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.

Spent Tea Leaves and Coffee Grounds as Potential Biocathode for Improved Microbial Electrosynthesis Performance

“…Comparison of the average current densities revealed an increase in current output (mA/m discussed above (Figure 2(c)). Recent studies have also reported improved current performance for STL and reported mild antimicrobial properties of SCG that could affect microbial metabolism [19,21,29].…”

“…Notably, STL and SCG are potential energy sources enriched with carbonderivatives such as alkaloids and polyphenols (STL) and organic compounds including fatty acids, hemicelluloses, lignin, cellulose, and other polysaccharides (SCG) [14,15]. Recent studies have highlighted the potential of SCG and STL as a source of sugars [16], bioethanol [17], and biodiesel [18], and some studies have exploring the use of STL and SCG for fabricating electrodes [19][20][21]. In this context, STL and SCG are promising options for use in MESs to reduce the carbon footprint and energy consumption associated with electrode manufacturing.…”

Construction and application of NiCo2O4@MnS composite with hierarchical structure for hybrid supercapacitor

“…The continuous mining of fossil fuels has contributed to global weather warming while the need for energy in human daily lives is constantly increasing. [1][2][3] To address these issues, the development and research of electrochemical energy storage system are quietly necessary. [4][5][6] A supercapacitor, a kind of outstanding energy storage device, can bridge the gap between batteries and conventional capacitors.…”