scholarly journals Composite Graphene-Containing Porous Materials from Carbon for Capacitive Deionization of Water

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2620
Author(s):  
Tamuna Bakhia ◽  
Ruslan Kh. Khamizov ◽  
Zaur R. Bavizhev ◽  
Mukhamed D. Bavizhev ◽  
Magomet A. Konov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrode Materials ◽  
Electrochemical Cells ◽  
Capacitive Deionization ◽  
Porous Composite ◽  
New Techniques ◽  
Reduced Graphene ◽  
Mesoporous Activated Carbon ◽  
Composite Aerogels ◽  
Highly Porous

New techniques were developed for the synthesis of monolithic highly porous composite aerogels (hydrogels) from reduced graphene oxide and carbon nanotubes, as well as graphene-containing composites based on mesoporous activated carbon. Simple operations for hydrophilization of synthesized samples were proposed. New electrode materials for electrosorption and deionization of water were fabricated. The resulting materials were investigated and tested in electrochemical cells for membrane capacitive deionization (MCDI).

Si-mediated fabrication of reduced graphene oxide and its hybrids for electrode materials

2015 ◽  
Vol 17 (2) ◽  
pp. 776-780 ◽  
Author(s):  
Barun Kumar Barman ◽  
Karuna Kar Nanda
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrode Materials ◽  
Multiwall Carbon Nanotubes ◽  
Environmentally Friendly ◽  
Si Substrate ◽  
Reduced Graphene ◽  
Multiwall Carbon

We demonstrate a Si-mediated environmentally friendly reduction of graphene oxide (GO) and the fabrication of hybrid electrode materials with multiwall carbon nanotubes and nanofibers. The reduction of GO is facilitated by the nascent hydrogen generated by the reaction between Si and KOH. The overall process consumes 10 to 15 μm of Si each time and the same Si substrate can be used multiple times.

A comparative study of Ni–Mn layered double hydroxide/carbon composites with different morphologies for supercapacitors

2016 ◽  
Vol 18 (43) ◽  
pp. 30068-30078 ◽  
Author(s):  
M. Li ◽  
F. Liu ◽  
X. B. Zhang ◽  
J. P. Cheng
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Comparative Study ◽  
Layered Double Hydroxide ◽  
Electrode Materials ◽  
Carbon Materials ◽  
Carbon Composites ◽  
Reduced Graphene ◽  
Double Hydroxide

A variety of carbon materials varying from 0D to 2D, i.e. 0D nanoparticles, 1D carbon nanotubes (CNTs) and 2D reduced graphene oxide (rGO) are selected to in situ combine with Ni–Mn layered double hydroxide (LDH) to prepare electrode materials for supercapacitors.

Moderately oxidized graphene–carbon nanotubes hybrid for high performance capacitive deionization

RSC Advances ◽  
2016 ◽  
Vol 6 (64) ◽  
pp. 58907-58915 ◽  
Author(s):  
Helan Zhang ◽  
Peng Liang ◽  
Yanhong Bian ◽  
Yong Jiang ◽  
Xueliang Sun ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Electrode Materials ◽  
Capacitive Deionization

Moderately oxidized graphene–carbon nanotubes hybrid can be used as good electrode materials for CDI with enhanced electrosorption capacity.

scholarly journals Graphene/Reduced Graphene Oxide-Carbon Nanotubes Composite Electrodes: From Capacitive to Battery-Type Behaviour

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1240
Author(s):  
Olena Okhay ◽  
Alexander Tkach
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrode Materials ◽  
Electrical Energy ◽  
Portable Devices ◽  
Composite Electrodes ◽  
Mechanical Pressure ◽  
Reduced Graphene ◽  
Wide Range

Thanks to the advanced technologies for energy generation such as solar cells and thermo- or piezo-generators the amount of electricity transformed from light, heat or mechanical pressure sources can be significantly enhanced. However, there is still a demand for effective storage devices to conserve electrical energy which addresses the wide range of large stationary applications from electric vehicles to small portable devices. Among the large variety of energy-storage systems available today, electrochemical energy sources and, in particular, supercapacitors (SC), are rather promising in terms of cost, scaling, power management, life cycle and safety. Therefore, this review surveys recent achievements in the development of SC based on composites of such carbon-derived materials as graphene (G) and reduced graphene oxide (rGO) with carbon nanotubes (CNT). Various factors influencing the specific capacitance are discussed, while specific energy and power as well as cycling stability of SC with G/rGO-CNT composite electrode materials are overviewed.

α-NiS grown on reduced graphene oxide and single-wall carbon nanotubes as electrode materials for high-power supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (35) ◽  
pp. 27940-27945 ◽  
Author(s):  
Ji Yan ◽  
Gregory Lui ◽  
Ricky Tjandra ◽  
Xiaolei Wang ◽  
Lathankan Rasenthiram ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
High Power ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Single Wall Carbon Nanotubes ◽  
Rate Performance ◽  
Reduced Graphene

α-NiS combined with SWNTs and graphene exhibits high specific capacitance, and excellent rate performance and cycling stability.

scholarly journals Highly Porous Free-Standing rGO/SnO2 Pseudocapacitive Cathodes for High-Rate and Long-Cycling Al-Ion Batteries

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2024
Author(s):  
Timotheus Jahnke ◽  
Leila Raafat ◽  
Daniel Hotz ◽  
Andrea Knöller ◽  
Achim Max Diem ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Reduced Graphene Oxide ◽  
Electrode Materials ◽  
Lithium Ion ◽  
High Rate ◽  
High Porosity ◽  
Reduced Graphene ◽  
Ion Species ◽  
Highly Porous

Establishing energy storage systems beyond conventional lithium ion batteries requires the development of novel types of electrode materials. Such materials should be capable of accommodating ion species other than Li+, and ideally, these ion species should be of multivalent nature, such as Al3+. Along this line, we introduce a highly porous aerogel cathode composed of reduced graphene oxide, which is loaded with nanostructured SnO2. This binder-free hybrid not only exhibits an outstanding mechanical performance, but also unites the pseudocapacity of the reduced graphene oxide and the electrochemical storage capacity of the SnO2 nanoplatelets. Moreover, the combination of both materials gives rise to additional intercalation sites at their interface, further contributing to the total capacity of up to 16 mAh cm−3 at a charging rate of 2 C. The high porosity (99.9%) of the hybrid and the synergy of its components yield a cathode material for high-rate (up to 20 C) aluminum ion batteries, which exhibit an excellent cycling stability over 10,000 tested cycles. The electrode design proposed here has a great potential to meet future energy and power density demands for advanced energy storage devices.

scholarly journals Activated Carbon Blended with Reduced Graphene Oxide Nanoflakes for Capacitive Deionization

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1090
Author(s):  
Gbenro Folaranmi ◽  
Mikhael Bechelany ◽  
Philippe Sistat ◽  
Marc Cretin ◽  
Francois Zaviska
Keyword(s):  
Graphene Oxide ◽  
Activated Carbon ◽  
Reduced Graphene Oxide ◽  
Electrode Materials ◽  
Porous Electrodes ◽  
Water Desalination ◽  
Operating Voltage ◽  
Capacitive Deionization ◽  
X Ray ◽  
Reduced Graphene

Capacitive deionization is a second-generation water desalination technology in which porous electrodes (activated carbon materials) are used to temporarily store ions. In this technology, porous carbon used as electrodes have inherent limitations, such as low electrical conductivity, low capacitance, etc., and, as such, optimization of electrode materials by rational design to obtain hybrid electrodes is key towards improvement in desalination performance. In this work, different compositions of mixture of reduced graphene oxide (RGO) and activated carbon (from 5 to 20 wt% RGO) have been prepared and tested as electrodes for brackish water desalination. The physico-chemical and electrochemical properties of the activated carbon (AC), reduced graphene oxide (RGO), and as-prepared electrodes (AC/RGO-x) were characterized by low-temperature nitrogen adsorption measurement, scanning electron microscope (SEM), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Fourier transform infra-red (FT-IR), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Among all the composite electrodes, AC/RGO-5 (RGO at 5 wt%) possessed the highest specific capacitance (74 F g−1) and the highest maximum salt adsorption capacity (mSAC) of 8.10 mg g−1 at an operating voltage ∆E = 1.4 V. This shows that this simple approach could offer a potential way of fabricating electrodes of accentuated carbon network of an improved electronic conductivity that’s much coveted in CDI technology.

Sign in / Sign up

Export Citation Format

Share Document