New development in carbon-based electrodes and electrolytes for enhancement of supercapacitor performance and safety

Zallouz, Sirine; Pronkin, Sergey; Meins, Jean‐Marc Le; Pham‐Huu, Cuong; Ghimbeu, Camélia Matei

doi:10.1016/b978-0-443-18439-0.00011-2

Cited by 2 publications

(1 citation statement)

References 178 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Increasing the operating voltage seems highly relevant to both improving the capacitor performance and increasing the capacitance . Recently, water-in-salt-type electrolytes, in which the amount of salt exceeds that of the solvent in terms of mass and volume, have been studied because of their ability to handle relatively high operating voltages ( U , ∼3 V). − The main advantage of water-in-salt electrolytes is preventing water decomposition, which directly increases voltage and energy . While the inherent advantages of aqueous electrolytes are preserved, water-in-salt electrolytes prohibit the thermodynamic limitation of water found in traditional aqueous electrolytes, making them promising additions for future devices.…”

Section: Introductionmentioning

confidence: 99%

Carbon Capacitors Operating at 1.8 V Based on Concentrated Aqueous Electrolytes: Impacts of the Electrolyte Concentration and Carbon Properties

Zallouz,

Dentzer,

Matei Ghimbeu

2024

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

Aqueous electrolytes with high concentrations of salt are of great interest in increasing the energy density and safety of carbon supercapacitors. Herein, electrolytes based on potassium acetate salt in different concentrations (20−60 wt %) are studied, and a concentration of 40 wt % results in the highest capacitance and rate capability. This behavior is a compromise between the electrolyte ion adsorption, which is small for low concentrations, and the resistance, which is large for high-concentration electrolytes. An increase in the voltage window of 1.8 V is achieved, which significantly improves the capacitance to 162 F g −1 at 0.1 A g −1 and the energy density to 22.9 W h kg −1 at a power density of 45 W kg −1 . In addition, the long cycling retention shows the best retention for 1.5 V (104%), which decreases for 1.8 V (72%), however, without significantly increasing the electrode resistance. At 2.0 V, the capacitance drops, and the resistance increases considerably. Subsequently, a series of microporous and mesoporous carbons with different characteristics are investigated with 40 wt % potassium acetate in water at 1.8 V. The development of the specific surface area to 2300 m 2 g −1 enables the capacitance to increase (to 182 F g −1 at 0.1 A g −1 ). At high current density, mesoporosity proved to play a crucial role in enhancing the capacitance retention. Along with the presence of a high oxygen content, the electrolyte diffusion and interactions are favored, which is beneficial for enhanced rate capability. Other properties, such as pore connectivity, material structure, and morphology, are determined to achieve the optimal performance.

show abstract

Section: Introductionmentioning

confidence: 99%

Carbon Capacitors Operating at 1.8 V Based on Concentrated Aqueous Electrolytes: Impacts of the Electrolyte Concentration and Carbon Properties

Zallouz,

Dentzer,

Matei Ghimbeu

2024

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

Improvement of Power Density and COD Removal in a Sediment Microbial Fuel Cell with α-FeOOH Nanoparticles

Mejía-López,

Lastres,

Alemán-Ramírez

et al. 2024

Catalysts

View full text Add to dashboard Cite

Sediment microbial fuel cells (SMFC) are bioelectrochemical systems that can use different wastes for energy production. This work studied the implementation of nanoparticles (NPs) of α-FeOOH (goethite, which is well-known as a photoactive catalyst) in the electrodes of an SMFC for its potential use for dye removal. The results obtained demonstrate the feasibility of the NPs activation with the electrical potential generated in the electrodes in the SMFC instead of the activation with light. The NPs of α-FeOOH were synthesized using a hydrothermal process, and the feasibility of a conductive bio-composite (biofilm and NPs) formation was proven by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and electrochemical techniques. The improvement of the power density in the cell was more than twelve times higher with the application of the bio-composite, and it is attributed mostly to the presence of NPs. The results also demonstrate the NPs effect on the increase of the electron transfer, which resulted in 99% of the COD removal. The total electrical energy produced in 30 days in the SMFC was 1.2 kWh based on 1 m2 of the geometric area of the anode. The results confirm that NPs of α-FeOOH can be used to improve organic matter removal. Moreover, the energy produced due to its activation through the potential generated between the electrodes suggests the feasibility of its implementation for dye removal.

show abstract

New development in carbon-based electrodes and electrolytes for enhancement of supercapacitor performance and safety

Cited by 2 publications

References 178 publications

Carbon Capacitors Operating at 1.8 V Based on Concentrated Aqueous Electrolytes: Impacts of the Electrolyte Concentration and Carbon Properties

Carbon Capacitors Operating at 1.8 V Based on Concentrated Aqueous Electrolytes: Impacts of the Electrolyte Concentration and Carbon Properties

Improvement of Power Density and COD Removal in a Sediment Microbial Fuel Cell with α-FeOOH Nanoparticles

Contact Info

Product

Resources

About