Preparation, surface characteristics, and electrochemical double-layer capacitance of KOH-activated carbon aerogels and their O- and N-doped derivatives

Zapata-Benabithe, Zulamita; Carrasco-Marín, Francisco; Moreno‐Castilla, Carlos

doi:10.1016/j.jpowsour.2012.07.036

Cited by 72 publications

(36 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5c). In agreement with the CV results, the NHCNC-3 exhibits the largest gravimetric capacitance among these four hollow carbon materials, which is the highest among recently published carbon materials, such as graphene 26 , CNFs 27 , MWNT 28 and carbon aerogels 29 ( Supplementary Table S2). At high current density (10 A g −1 ), the capacitor retention of NHCNC-3 is 76.5%, showing good rate performance (Fig.…”

Section: Resultssupporting

confidence: 86%

Biocompatible Mesoporous Hollow Carbon Nanocapsules for High Performance Supercapacitors

Wang

Liu

Bradley

et al. 2020

Sci Rep

View full text Add to dashboard Cite

A facile and general method for the controllable synthesis of n-doped hollow mesoporous carbon nanocapsules (NHCNCs) with four different geometries has been developed. The spheres (NHCNC-1), low-concaves (NHCNC-2), semi-concaves (NHCNC-3) and wrinkles (NHCNC-4) shaped samples were prepared and systematically investigated to understand the structural effects of hollow particles on their supercapacitor performances. Compared with the other three different shaped samples (NHCNC-1, NHCNC-2, and NHCNC-4), the as-synthesized semi-concave structured NHCNC-3 demonstrated excellent performance with high gravimetric capacitance of 326 F g −1 (419 F cm −3 ) and ultra-stable cycling stability (96.6% after 5000 cycles). The outstanding performances achieved are attributed to the unique semi-concave structure, high specific surface area (1400 m 2 g −1 ), hierarchical porosity, high packing density (1.41 g cm −3 ) and high nitrogen (N) content (up to 3.73%) of the new materials. These carbon nanocapsules with tailorable structures and properties enable them as outstanding carriers and platforms for various emerging applications, such as nanoscale chemical reactors, catalysis, batteries, solar energy harvest, gas storage and so on. In addition, these novel carbons have negligible cytotoxicity and high biocompatibility for human cells, promising a wide range of bio applications, such as biomaterials, drug delivery, biomedicine, biotherapy and bioelectronic devices.Supercapacitors have drawn increasing attention due to their high power density, fast charge/discharge capability, long cycle life, low cost and environmental friendliness among various electrochemical energy storage devices 1 . Carbon materials are the most promising supercapacitor electrode materials, due to their high specific surface area, high electrical conductivity, tailorable pore structures and excellent chemical stability 2 . The pore structures and the surface properties of carbon materials have significant effects on the electrode performances 3 . In order to increase the volumetric capacitance of the electrode materials 4,5 , it is vital to optimize the morphology and reduce the void volume of the hollow porous carbon materials.Hollow carbon nanocapsules (HCNCs) are an interesting class of carbon materials, due to their unique properties such as high surface-to-volume ratio, low densities, large void space and high electrical conductivity 6,7 . The hollow macropore cavities and interior space of the HCNCs can act as anion-buffering reservoirs to shorten the diffusion distance of electrolyte ions 8 , while the mesopores and micropores in the shell can promote ion transport, minimize diffusion pathways from the electrolyte to the micropores, and increase the specific surface area to maximize the electric double layer capacitance 9 . For high-rate performances, HCNCs are particularly interesting as they have ultrahigh specific surface area, large surface-to-volume ratio, large void space along with an appropriate interconnected pore channels to facilitate ion ...

show abstract

Section: Resultssupporting

confidence: 86%

Biocompatible Mesoporous Hollow Carbon Nanocapsules for High Performance Supercapacitors

Wang

Liu

Bradley

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The behaviour of electric double layer capacitor (EDLC) is generally expressed in the form of a rectangular shape of voltammetry characteristic (Frackowiak & Beguin, 2001). The specific capacitance of one electrode was given by the following equation (Zapata-Benabithe et al, 2012):…”

Section: Methodsmentioning

confidence: 99%

“…It was shown that the capacitance decreased when the scan rate increased. The specific capacitance decreased with scan rates due to the EDL formation within the micropores was slower and less complete in comparison to rate of variation in potential (Zapata-Benabithe et al, 2012). …”

Section: Electrochemical Behaviourmentioning

confidence: 96%

Desiccated Coconut Residue Based Activated Carbon as an Electrode Material for Electric Double Layer Capacitor

Yahya¹,

Ngah²,

Hashim³

et al. 2015

APR

View full text Add to dashboard Cite

Activated carbon derived from desiccated coconut residue was treated with sodium hydroxide (NaOH) and analyzed for its supercapacitor performance. The sample was then characterized by N 2 adsorption at -196°C, Energy dispersive x-ray (EDX) analysis and X-ray diffraction (XRD) in order to investigate its surface area, porosity and microcrystalline properties. Specific surface area (SSA) was found to be 1394.79 m 2 /g with high microporosity of 76.92 %. Electrochemical double-layer capacitance was studied by cyclic voltammetry with potential window of 1V. The presence of high microporosity properties affects the supercapacitor performance due to lack of accessibility of the electrolyte into the activated carbon pores. The calculated specific capacitance was found to be 42 F/g.

show abstract

“…More development in porous structure of 2S2-900 sample can be observed more clearly by its nitrogen adsorption-desorption isotherms and pore size distribution compared to that of 2S1-900 sample in Figures 2 and 3. It indicates that the continuous solvent exchange process by fresh acetone immediately after finishing the gelation process plays an important role in maintaining mesopores due to reducing the surface tensions upon drying in ambient conditions; it leads to restriction of the collapse of the weak gel network [16,17], which on the carbonization slowly generates carbon porosity. From the above investigated results, the RC ratio of 2 and acetone exchange after every 3 hours during the first day were selected for preparation conditions of carbon xerogels in the next investigation.…”

Section: Characterization Of Materialmentioning

confidence: 99%

Investigation of the Characteristic Properties of Glacial Acetic Acid-Catalyzed Carbon Xerogels and Their Electrochemical Performance for Use as Electrode Materials in Electrical Double-Layer Capacitors

Quach

Yang

Chung

et al. 2017

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Glacial acetic acid was used as a catalyst in the preparation process of carbon xerogels from the condensation of resorcinol and formaldehyde for shortening significantly the gelation time. The effect of the resorcinol/catalyst ratio over a large range of 2 to 500, the solvent exchange manner with acetone, and the pyrolysis temperature of 700 to 1000 ∘ C on the characteristic properties of the carbon xerogels were investigated. A resorcinol/catalyst ratio of 2 and a pyrolysis temperature at 800 ∘ C were found to be the optimal condition for the preparation of carbon xerogels with a well-balanced porosity between micro-and mesopores, high surface area (577.62 m 2 g −1 ), and large pore volume (0.97 cm 3 g −1 ), which are appropriate for use as electrode materials in an electrical double-layer capacitor. The carbon xerogel electrodes that were prepared under these optimal conditions exhibited a good electrochemical performance with the highest specific capacitance of 169 Fg −1 in 6 M KOH electrolyte at a scan rate of 5 mVs −1 from cyclic voltammetry.

show abstract

Preparation, surface characteristics, and electrochemical double-layer capacitance of KOH-activated carbon aerogels and their O- and N-doped derivatives

Cited by 72 publications

References 43 publications

Biocompatible Mesoporous Hollow Carbon Nanocapsules for High Performance Supercapacitors

Biocompatible Mesoporous Hollow Carbon Nanocapsules for High Performance Supercapacitors

Desiccated Coconut Residue Based Activated Carbon as an Electrode Material for Electric Double Layer Capacitor

Investigation of the Characteristic Properties of Glacial Acetic Acid-Catalyzed Carbon Xerogels and Their Electrochemical Performance for Use as Electrode Materials in Electrical Double-Layer Capacitors

Contact Info

Product

Resources

About