Electrolytic Study of Pineapple Peel Derived Porous Carbon for All‐Solid‐State Supercapacitors

Abstract

Biowaste derived carbon materials are recently gaining attention owing to their high specific surface area (SSA) and decent electrical conductivity. Herein, pineapple peel derived porous carbon nanosheets have been synthesized at different activation temperatures (PP‐600, PP‐700 and PP‐800). This shows that its high SSA along with hierarchal pore size distribution makes it a suitable electrode material for supercapacitors. Further, the electrochemical performance of the as prepared electrode material was carried out in three different electrolytes viz. acidic (1 M H2SO4), basic (6 M KOH) and neutral (1 M Na2SO4) and among them 1 M H2SO4 electrolyte shows superior electrochemical performance. Furthermore, PP‐800 electrode material displayed highest specific capacitance of 368.8 F/g in 1 M H2SO4 electrolyte, which is much higher when tested and compared in 6 M KOH (34 F/g) and 1 M Na2SO4 (102.7 F/g) electrolytes at a constant current density of 1 A/g. Additionally, symmetrical solid‐state supercapacitor was fabricated by utilizing PP‐800 electrodes and PVA gel electrolyte, that rendered remarkable energy density of ∼43 Wh/kg at a high‐power density of ∼1 kW/kg. The as fabricated PP‐800//PP‐800 device displayed an extraordinary cycle life exhibiting capacitance retention of 83 % after 10000 ultra‐long charge‐discharge cycles.

Surface and Diffusion Charge Contribution Studies of Human Hair-Derived Heteroatom-Doped Porous Carbon Electrodes for Supercapacitors

“…The presence of the carbonyl group was corroborated by the peak positioned at 1634 cm –1 . The overlapping of C–O stretching vibrations is represented by a small peak at 1380 cm –1 , whereas the CO stretching vibrations are represented by a broad peak at 1115 cm –1 . , …”

“…The overlapping of C−O stretching vibrations is represented by a small peak at 1380 cm −1 , whereas the CO stretching vibrations are represented by a broad peak at 1115 cm −1 . 24,25 Barrett−Joyner−Halenda (BJH) pore size distribution and BET N 2 adsorption−desorption studies were used to evaluate the SSA as well as for the assessment of the various pores present and their allocations in the as-generated AC. Figure 3a displays the N 2 adsorption−desorption isotherm of the samples which clearly reveals the typical type IV (mesoporous characteristics) and type II (macroporous characteristic) adsorption−desorption behaviors.…”

Facile Synthesis of Pineapple Waste-Derived Carbon and Polyaniline Composite for High-Energy-Density Asymmetric Supercapacitors

“…PP-800 is derived via hydrothermal carbonization of pineapple peel followed by KOH activation at 800 °C as described in our previously published work . PP-800/PANI hybrid material was developed by the in situ chemical oxidative polymerization technique with some modifications.…”

“…PP-800 is derived via hydrothermal carbonization of pineapple peel followed by KOH activation at 800 °C as described in our previously published work. 28 PP-800/PANI hybrid material was developed by the in situ chemical oxidative polymerization technique 29 with some modifications. Briefly, 2.5 g of APS was added to 50 mL of 1 M HCl and 100 mg of PP-800 was taken in 50 mL of DI water; then, these two solutions were mixed and sonicated for 2−4 h. Afterward, the resulting mixture was kept in an ice bath and 1 mL of aniline was added to it dropwise with continuous stirring.…”

Surface and Diffusion Characteristics of Nanoporous UiO-66/Pineapple Peel-Derived Carbon Composites for Solid-State Supercapacitors

“…By incorporation of PA-AC into the UiO-66 MOF, the resulting composite material can have improved sustainability credentials, making it an attractive option for supercapacitor applications. Additionally, the use of waste materials from pineapple processing can contribute to cost-effectiveness, as it reduces the reliance on expensive or scarce carbon sources …”