Facile and sustainable technique to produce low-cost high surface area mangosteen shell activated carbon for supercapacitors applications

Kitenge, Vianney Ngoyi; Tarimo, Delvina Japhet; Oyedotun, Kabir O.; Rutavi, Gift; Manyala, Ncholu

doi:10.1016/j.est.2022.105876

Cited by 15 publications

(6 citation statements)

References 56 publications

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“…Due to the diversity of biomass, different activators were used to activate CSSC to obtain the optimum structural properties of AC. After the CSSC is mixed with KOH, the relevant activation processes are summarized as follows 6 K O H + 2 normalC → 2 normalK + 3 H 2 + 2 K 2 normalC normalO 3 …”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the carbon materials activated by KOH and K 2 CO 3 have a higher SSA than those activated by CuCl 2 due to their ability to produce K, K 2 O, CO, and CO 2 through reduction reactions with carbon, thus resulting in much more pores. 12 Besides, the unique promotion role of metal potassium on pore development is critical, but it is apparently absent in the activated process of CuCl 2 activation. Consequently, the SSA of CSSC−CuCl 2 -1:3 is smaller than that of CSSC−K 2 CO 3 -1:3 and CSSC−KOH-1:3.…”

Section: Cuclmentioning

confidence: 99%

“…Compared to pseudocapacitors, which stored charges via the Faradaic redox reactions near the surface of the electrode, EDLCs demonstrate superior power density, enhanced cycling stability, and improved rate performance. 12,13 However, the limited energy density of SCs (10 W h kg −1 ) significantly hinders their commercial viability. The main elements impacting the energy density of SCs are the electrolyte and electrode materials.…”

Section: Introductionmentioning

confidence: 99%

“…One notable characteristic of the EDLCs is that the electrodes are made of porous carbon materials with a large specific surface area (SSA), which are submerged in an electrolyte solution and separated by membranes. Compared to pseudocapacitors, which stored charges via the Faradaic redox reactions near the surface of the electrode, EDLCs demonstrate superior power density, enhanced cycling stability, and improved rate performance. , However, the limited energy density of SCs (10 W h kg –1 ) significantly hinders their commercial viability. The main elements impacting the energy density of SCs are the electrolyte and electrode materials. , As a result, improving the structure and composition of current electrode materials or developing new electrode materials and electrolytes is a key strategy for addressing the issue of the poor energy density of SCs.…”

Section: Introductionmentioning

confidence: 99%

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Activated Carbon Derived from the Agricultural Waste Camellia Seed Shell for High-Performance Supercapacitors

Yang,

Peng,

Lei

et al. 2024

ACS Appl. Energy Mater.

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Under the background of the current promotion of global green, environmental protection, and energy conservation, the sustainable conversion of low-cost agricultural waste biomass into high value-added products has become a hot topic. Herein, agricultural waste camellia seed shells obtained after pressing oil are used to prepare porous carbon materials with a high specific surface area (SSA) and excellent electrochemical properties for the application of supercapacitors. The effects of different chemical activators and mass ratios on the pore structure and electrochemical properties of agricultural waste camellia seed shell-derived activated carbon (CSSC) were investigated. It has been found that the CSSC activated by KOH presents excellent physical and electrochemical performances, and the pore structures of all the prepared activated carbons were predominantly a combination of mesopores and micropores. Especially, owing to the high SSA (1219 m 2 g −1 ) and porous structure of the CSSC− KOH-1:3 material, the electrode provides an outstanding specific capacitance of 305 F g −1 at a current density of 0.5 A g −1 . Furthermore, the symmetric supercapacitor assembled with CSSC−KOH-1:3 electrodes can deliver a high energy density (15.37 W h kg −1 ) and power density (12.9 kW kg −1 ), and it can still maintain high cycling stability even after 10,000 charge and discharge processes. Therefore, this work provides a significant exploration for the high-value application of the agricultural waste camellia seed shell and low-cost preparation of the porous carbon for the application of high-performance supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Section: Cuclmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Activated Carbon Derived from the Agricultural Waste Camellia Seed Shell for High-Performance Supercapacitors

Yang,

Peng,

Lei

et al. 2024

ACS Appl. Energy Mater.

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“…Activated carbon derived from mangosteen shell (MS-AC), which was synthesized in our previous work, was used as the electrode material. A one-step carbonization/activation method was used to synthesize the material from the mangosteen shells (MS) [25]. The synthesis process involved pyrolyzing a mixture of 5 grams (g) of mangosteen shells and 5 g of K 2 CO 3 (activating agent) in a tubular furnace.…”

Section: Methodsmentioning

confidence: 99%

Electrical Double-Layer Capacitor Based on Low Aqueous Electrolyte Contents in EmimTFO Ionic Liquid

Kitenge

Tarimo

Oyedotun

et al. 2023

International Journal of Energy Research

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A study has been conducted on the electrochemical properties of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EmimTFO) protic ionic liquid enhanced by adding potassium nitrate (2.5 M) aqueous solution. The properties of EmimTFO as well as mixtures diluted by molar fractions of 0.6, 0.7, 0.8, and 0.9 of KNO3 were also investigated through measurements of viscosity, density, and conductivity. In a three-electrode test run at 0.25 A g-1, the addition of 2.5 M KNO3 solution generated peak specific capacities of ~40.2 and ~85.8 mAh g-1 on the positive and negative potentials, respectively. These performances surpassed the specific capacities obtained for EmimTFO in a three-electrode run at 0.25 A g-1 using the same electrode material (activated carbon). The top-performing electrolyte mixture ([EmimTFO]0.8[2.5 M KNO3]0.2) was then used to assemble a symmetric supercapacitor, which could run at a voltage of ~2.1 V. The device was able to retain 71.35% of its capacitance after 10,000 cycles of charge and discharge. It also displayed higher specific energy and power of 22.21 Wh kg-1 and 520 W kg-1, respectively, at 0.5 A g-1 as compared to specific energies of 4.73 Wh kg-1 and 11.2 Wh kg-1 for the devices assembled with single EmimTFO and 2.5 M KNO3 as the electrolytes, respectively.

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From Waste to Power: Developing Structural Supercapacitors with Red Mud and Jute Stick

Nor,

Al‐Qwairi,

Mirghni

et al. 2024

Chemistry An Asian Journal

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Developing effective, cost‐efficient, and eco‐friendly energy storage solutions is crucial for sustainable building structures. Red mud, a waste material, was used as the electrolyte and separator in supercapacitors, alongside activated carbon derived from jute sticks coated on steel mesh electrodes. Tests on RM‐enhanced supercapacitors showed that 20% by weight of RM was the best amount. This increased the modulus of elasticity by 33%, the tensile strength by 3%, and the compressive strength by 10%. Durability was largely unaffected, with minimal additional water absorption and slight shrinkage variation. The supercapacitor cell had an extended cell potential of 1.5 V and a maximum specific capacitance of 62.3 F g‐1 at 0.4 A g‐1, as shown by electrochemical tests. This improved energy density to 19.5 Wh kg‐1, with a power density of 301.8 W kg‐1 at 0.4 A g‐1 and a maximum power density of 605.8 W kg‐1 at 0.8 A g‐1. The cell retained 77% of its initial capacitance after 450 continuous GCD cycles, demonstrating notable stability. This stability is due to the solid electrolyte and the synergy between JC and RM, indicating promising advancements for future energy storage devices.

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Facile and sustainable technique to produce low-cost high surface area mangosteen shell activated carbon for supercapacitors applications

Cited by 15 publications

References 56 publications

Activated Carbon Derived from the Agricultural Waste Camellia Seed Shell for High-Performance Supercapacitors

Activated Carbon Derived from the Agricultural Waste Camellia Seed Shell for High-Performance Supercapacitors

Electrical Double-Layer Capacitor Based on Low Aqueous Electrolyte Contents in EmimTFO Ionic Liquid

From Waste to Power: Developing Structural Supercapacitors with Red Mud and Jute Stick

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