Stability analysis of functionalized mesoporous carbon materials in aqueous solution

Krawczyk

J Solid State Electrochem

et al. 2016

Activated carbon modified by ozone treatment was examined. The process was carried out in a glass reactor under a continuous flow of ozone through a bed of activated carbon for 15, 30, 60, 120, and 240 min. The modified and unmodified carbon materials were characterized by Raman spectroscopy and observed by scanning electron microscopy (SEM). Thermogravimetric analysis was used to estimate the presence of oxygen groups in the carbon structure. The surface area and pore size distribution were examined by nitrogen adsorption method at 77 K. Moreover, Fourier transform infrared (FTIR) spectroscopy was used to estimate the functional groups of modified activated carbon. The carbon content was estimated using the elemental analysis. The process of ozonation increases oxygen functionalities, thus the activated carbon was tested as electrodes for an electrochemical capacitor. The performance of an electrochemical capacitor was estimated by selected alternating (AC) and direct current (DC) methods in 1 M H 2 SO 4 , 1 M Na 2 SO 4 , and 6 M KOH electrolytes.

Section: Resultsmentioning

confidence: 88%

The application of activated carbon modified by ozone treatment for energy storage

Krawczyk

J Solid State Electrochem

et al. 2016

“…Further mass loss (at higher temperature) can be associated with carbon monoxide formation. Carbon monoxide is formed as a result of carboxylic anhydrides, ether-type oxygen, quinone and carbonyl groups [24][25][26][27][28]. It should be noted that heteroatom functionalities could be responsible for increasing the overall capacitance of electrochemical capacitors.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Capacitors Based on Electrodes Made of Lignocellulosic Waste Materials

Kolanowski

Graś

Bartkowiak

et al. 2019

Waste Biomass Valor

Activated carbons have been obtained from the following organic precursors (lignocellulosic waste materials): willow, rapeseed straw, hemp shives, flax shives, switch grass, Virginia mallow and giant miscanthus. The activation process has been performed by using potassium hydroxide at 750 °C. Elemental analysis has been performed in order to determine the presence of heteroatoms in the carbon structure. Boehm titration was used to estimate the functional groups of carbon materials. The surface area was characterized using gas adsorption method. All the obtained samples have been used as electrodes for electrochemical capacitors operated in 1 M H 2 SO 4. The electrochemical characterization was carried out using cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. All measurements proved that carbon materials obtained from different lignocellulosic wastes are suitable for energy storage applications. Moreover, the content of oxygen groups has great influence on the charge storage mechanism. Excessive oxygen content causes the disruption of surface conjugation of the carbon material.

“…Finally, the z-potential of the DEHP functionalized SERS silica particle was measured to be À28.1 mV, indicating that the synthesized Ag-SiO 2 was electrostatically stable. 59 Therefore, a stable DEHP modied SERS silica particle was successfully developed.…”

Section: Characterization Of the Dehp Functionalized Sers Silica Partmentioning

confidence: 99%

A SERS aptasensor for sensitive and selective detection of bis(2-ethylhexyl)phthalate

Garza

Coté

2019

RSC Adv.