Reduced graphene oxide and activated carbon composites for capacitive deionization

2012 ◽  
Vol 22 (31) ◽  
pp. 15556 ◽  
Author(s):  
Haibo Li ◽  
Likun Pan ◽  
Chunyang Nie ◽  
Yong Liu ◽  
Zhuo Sun
Keyword(s):  
Graphene Oxide ◽  
Activated Carbon ◽  
Reduced Graphene Oxide ◽  
Carbon Composites ◽  
Capacitive Deionization ◽  
Reduced Graphene

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.

Electrospun Composites Made of Reduced Graphene Oxide and Activated Carbon Nanofibers for Capacitive Deionization

2014 ◽  
Vol 137 ◽  
pp. 388-394 ◽  
Author(s):  
Qiang Dong ◽  
Gang Wang ◽  
Bingqing Qian ◽  
Chao Hu ◽  
Yuwei Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Activated Carbon ◽  
Reduced Graphene Oxide ◽  
Carbon Nanofibers ◽  
Capacitive Deionization ◽  
Activated Carbon Nanofibers ◽  
Reduced Graphene

scholarly journals Electrospun Composites Made of Reduced Graphene Oxide and Polyacrylonitrile-Based Activated Carbon Nanofibers (rGO/ACNF) for Enhanced CO2 Adsorption

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2117
Author(s):  
Faten Ermala Che Othman ◽  
Norhaniza Yusof ◽  
Javier González-Benito ◽  
Xiaolei Fan ◽  
Ahmad Fauzi Ismail
Keyword(s):  
Graphene Oxide ◽  
Activated Carbon ◽  
Reduced Graphene Oxide ◽  
Carbon Nanofibers ◽  
Co2 Adsorption ◽  
Morphological Properties ◽  
Co2 Uptake ◽  
Order Model ◽  
Activated Carbon Nanofibers ◽  
Reduced Graphene

In this work, we report the preparation of polyacrylonitrile (PAN)-based activated carbon nanofibers composited with different concentrations of reduced graphene oxide (rGO/ACNF) (1%, 5%, and 10% relative to PAN weight) by a simple electrospinning method. The electrospun nanofibers (NFs) were carbonized and physically activated to obtain activated carbon nanofibers (ACNFs). Texture, surface and elemental properties of the pristine ACNFs and composites were characterized using various techniques. In comparison to pristine ACNF, the incorporation of rGO led to changes in surface and textural characteristics such as specific surface area (SBET), total pore volume (Vtotal), and micropore volume (Vmicro) of 373 m2/g, 0.22 cm3/g, and 0.15 cm3/g, respectively, which is much higher than the pristine ACNFs (e.g., SBET = 139 m2/g). The structural and morphological properties of the pristine ACNFs and their composites were studied by Raman spectroscopy and X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM) respectively. Carbon dioxide (CO2) adsorption on the pristine ACNFs and rGO/ACNF composites was evaluated at different pressures (5, 10, and 15 bars) based on static volumetric adsorption. At 15 bar, the composite with 10% of rGO (rGO/ACNF0.1) that had the highest SBET, Vtotal, and Vmicro, as confirmed with BET model, exhibited the highest CO2 uptake of 58 mmol/g. These results point out that both surface and texture have a strong influence on the performance of CO2 adsorption. Interestingly, at p < 10 bar, the adsorption process of CO2 was found to be quite well fitted by pseudo-second order model (i.e., the chemisorption), whilst at 15 bar, physisorption prevailed, which was explained by the pseudo-first order model.

Reduced graphene oxide modified activated carbon for improving power generation of air-cathode microbial fuel cells

2017 ◽  
Vol 33 (9) ◽  
pp. 1279-1287 ◽  
Author(s):  
Yang Yang ◽  
Tianyu Liu ◽  
Hanyu Wang ◽  
Xun Zhu ◽  
Dingding Ye ◽  
...  
Keyword(s):  
Power Generation ◽  
Graphene Oxide ◽  
Fuel Cells ◽  
Activated Carbon ◽  
Reduced Graphene Oxide ◽  
Microbial Fuel Cells ◽  
Air Cathode ◽  
Modified Activated Carbon ◽  
Reduced Graphene ◽  
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