Promising Porous Carbon Derived from Celtuce Leaves with Outstanding Supercapacitance and CO₂ Capture Performance

Abstract

Business costs and energy/environmental concerns have increased interested in biomass materials for production of activated carbons, especially as electrode materials for supercapacitors or as solid-state adsorbents in CO₂ adsorption area. In this paper, waste celtuce leaves were used to prepare porous carbon by air-drying, pyrolysis at 600 °C in argon, followed by KOH activation. The as-prepared porous carbon have a very high specific surface area of 3404 m²/g and a large pore volume of 1.88 cm³/g. As an electroactive material, the porous carbon exhibits good capacitive performance in KOH aqueous electrolyte, with the specific capacitances of 421 and 273 F/g in three and two-electrode systems, respectively. As a solid-state adsorbent, the porous carbon has an excellent CO₂ adsorption capacity at ambient pressures of up to 6.04 and 4.36 mmol/g at 0 and 25 °C, respectively. With simple production process, excellent recyclability and regeneration stability, the porous carbon that was derived from celtuce leaves is among the most promising materials for high-performance supercapacitors and CO₂ capture.

Capture and reversible storage of volatile iodine by porous carbon with high capacity

“…The carbon material was synthesized from commercial AC under argon atmosphere at 800°C using KOH activation, which has been widely used to generate highly micro-or nano-structures on mesoporous carbon, graphene, carbon nanotubes, and carbide-derived carbons to increase the special surface areas and pore volume as well as improve their adsorption properties for contaminates and gas [19][20][21][22]. During the KOH activation, the prominent chemical reaction between KOH and C involves the process [23,24]: 6KOH ?…”

Biomass-derived renewable carbon materials for electrochemical energy storage

“…Various biomass precursors, such as cherry stone [95], fish scale [96], waste paper [97], water bamboo [98], flour [67], yeast cells [99], fallen leaves [100], pine-cone [101], pig bone [65], willow catkins [102], celtuce leaves [103], waste tea-leaves [104], sunflower seed shell [105], ginkgo shells [106], cow dung [107], silk [108], human hair [109] and sewage sludge [110], have been chemically converted into ACs for supercapacitors. For example, a honeycomblike carbon foam has been successfully derived from natural flour via KOH activation, which exhibited a large specific surface area of 1313 m 2 g −1 and a high specific capacitance of 473 F g −1 (Figure 6(a,b)).…”

“…For example, a honeycomblike carbon foam has been successfully derived from natural flour via KOH activation, which exhibited a large specific surface area of 1313 m 2 g −1 and a high specific capacitance of 473 F g −1 (Figure 6(a,b)). Wang et al [103] reported a celtuce leaves-derived porous carbon with a ultrahigh specific surface area of 3404 m 2 g −1 and a large pore volume of 1.88 cm 3 g −1 . The obtained porous carbon can be used for both supercapacitor and CO 2 capture (Figure 6(c)).…”

Promising activated carbons derived from cabbage leaves and their application in high-performance supercapacitors electrodes

“…1. According to the IUPAC classification, type I isotherm curves for the AC-700, AC-800, and AC-900 samples are obtained [18,19]. The major nitrogen adsorption occurs at relative pressures less than 0.1.…”

“…They are generally produced by carbonization of original biomass materials followed by activation. Various biomass-derived AC have widely been used in other areas such as electrode materials for supercapacitors [18][19][20].…”