Preparation and Characterization of Porous Carbon from Mixed Leaves for High‐Performance Supercapacitors

Abstract

Main observation and conclusion With the increasing demand of sustainable and eco‐friendly resources, it is very attractive to use waste leaves for activated carbon (AC) preparation that can be used in supercapacitors. Considering the practically collected leaves are commonly in mixed nature, and extra efforts are needed to sort these mixtures, we here report the first preparation of AC using mixed leaves from different plants, including Platanus acerifolia (PA), Firmiana platanifolia (FP) and Pistia stratiotes (PS), and compared the results with single leaves‐derived AC materials. These leave‐derived AC samples were characterized with FESEM, EDS, FTIR and Raman spectroscopy, and electrochemical tests. The AC derived from mixed leaves (PA3FP1PS2AC) showed a good specific capacitance of 246 F·g−1 at 1 A·g−1 in aqueous 3 mol·L–1 KOH. This sample further showed the largest specific capacitance of 201 F·g−1 at 5 A·g−1, as compared with the non‐mixed AC samples, and a good stability of 100.0% capacitance retention over 1000 cycles. Utilizing mixed leaves for AC preparation is not only demonstrated to be a promising approach of low cost and high‐performance AC production for supercapacitor applications, but may also help environmental protection by reducing the invasive species problem.

Promising activated carbon derived from sugarcane tip as electrode material for high-performance supercapacitors

“…This indicates that the results are relatively close to that of an ideal supercapacitor (−90°), which suggests a primarily double-layer charge storage contribution with some pseudo-capacitive contribution for the material. 51 …”

“…This indicates that the results are relatively close to that of an ideal supercapacitor (À90 ), which suggests a primarily double-layer charge storage contribution with some pseudo-capacitive contribution for the material. 51 To study the practical application of the ACST-2 sample, the ACST-2//ACST-2 symmetric supercapacitor was assembled in 6.0 M KOH electrolyte with an operating voltage range of 0-1 V. Fig. 6a exhibits the CV curves of the symmetric capacitor, the electrode exhibits a rectangular shape at a scanning rate of 10 mV s À1 , indicating a typical double-layer capacitor behavior at the electrode and electrolyte interface.…”

A Novel Strategy of Multi‐element Nanocomposite Synthesis for High Performance ZnO‐CoSe2 Supercapacitor Material Development

“…[ 7 ] Carbon based materials have been widely researched for EDLCs. [ 8 ] Pseudocapacitor materials exhibit better energy storage capacities than that of EDLCs, arising from the Faradaic redox reactions, [ 9‐10 ] which stimulates researchers around the world to explore appropriate pseudocapacitive materials for high‐performance SCs.…”

Efficient Synthesis of Sugar Alcohols over a Synergistic and Sustainable Catalyst

“…With the diminishing fossil resources and global warming, the utilization of renewable biomass to produce fuels, value‐added chemicals, biomaterials, and prebiotics has attracted great attention. [ 1‐7 ] Sugar alcohols—xylitol, arabitol, and sorbitol, are derived from lignocellulose, which are listed as the 12 most important target chemicals by the US Department of Energy. [ 8 ] Sugar alcohols are the components widely applied in sweets, ice cream fillings, hard candies, sugar‐free chewing gum, moisturizer, softener, and texturizer in food and medical industries.…”