scholarly journals Onion-derived activated carbons with enhanced surface area for improved hydrogen storage and electrochemical energy application

RSC Advances ◽  
2020 ◽  
Vol 10 (45) ◽  
pp. 26928-26936
Author(s):  
Nicholas M. Musyoka ◽  
Bridget K. Mutuma ◽  
Ncholu Manyala
Keyword(s):  
Hydrogen Storage ◽  
Surface Area ◽  
Activated Carbons ◽  
Energy Application ◽  
Enhanced Surface ◽  
Supercapacitor Applications ◽  
Electrochemical Energy

Graphene-like activated carbons (ACs), with excellent properties for enhanced hydrogen storage and supercapacitor applications, were prepared from waste onion peels.

scholarly journals Pinecone-Derived Activated Carbons as an Effective Medium for Hydrogen Storage

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2237
Author(s):  
Sara Stelitano ◽  
Giuseppe Conte ◽  
Alfonso Policicchio ◽  
Alfredo Aloise ◽  
Giovanni Desiderio ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Hydrogen Storage ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Hydrogen Adsorption ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Textural Properties ◽  
Biomass Waste ◽  
Wavelength Dispersive Spectrometry

Pinecones, a common biomass waste, has an interesting composition in terms of cellulose and lignine content that makes them excellent precursors in various activated carbon production processes. The synthesized, nanostructured, activated carbon materials show textural properties, a high specific surface area, and a large volume of micropores, which are all features that make them suitable for various applications ranging from the purification of water to energy storage. Amongst them, a very interesting application is hydrogen storage. For this purpose, activated carbon from pinecones were prepared using chemical activation with different KOH/precursor ratios, and their hydrogen adsorption capacity was evaluated at liquid nitrogen temperatures (77 K) at pressures of up to 80 bar using a Sievert’s type volumetric apparatus. Regarding the comprehensive characterization of the samples’ textural properties, the measurement of the surface area was carried out using the Brunauer–Emmett–Teller method, the chemical composition was investigated using wavelength-dispersive spectrometry, and the topography and long-range order was estimated using scanning electron microscopy and X-ray diffraction, respectively. The hydrogen adsorption properties of the activated carbon samples were measured and then fitted using the Langmuir/ Töth isotherm model to estimate the adsorption capacity at higher pressures. The results showed that chemical activation induced the formation of an optimal pore size distribution for hydrogen adsorption centered at about 0.5 nm and the proportion of micropore volume was higher than 50%, which resulted in an adsorption capacity of 5.5 wt% at 77 K and 80 bar; this was an increase of as much as 150% relative to the one predicted by the Chahine rule.

scholarly journals Storage of Hydrogen in Activated Carbons and Carbon Nanotubes

2018 ◽  
Vol 18 (4) ◽  
pp. 5-16 ◽  
Author(s):  
E. E. Doğan ◽  
P. Tokcan ◽  
B. K. Kizilduman
Keyword(s):  
Activated Carbon ◽  
Carbon Nanotube ◽  
Hydrogen Storage ◽  
Surface Area ◽  
Storage Capacity ◽  
Activated Carbons ◽  
Ultrasonic Waves ◽  
Olive Leaf ◽  
Hydrogen Storage Capacity ◽  
X Ray

AbstractActivated carbons and carbon nanotube were synthesized with chemical and microwave processes of olive leaf in media with and without ultrasonic waves, and chemical vapor deposition method, respectively. The samples were characterized by x-ray diffraction, calorimetry, Brunauer, Emmett and Teller method, scanning electron microscopy/energy-dispersive X-ray, and zetasizer nano S90 instruments. The activated carbon synthesized in the ultrasonic bath had a higher surface area. The hydrogen adsorption capacity of carbon structures including activated carbons and carbon nanotube was measured as a function of pressure at 77 K. The hydrogen storage capacity of the carbon nanotube is 300% and 265% higher than the hydrogen storage capacity of activated carbons synthesized in medium without and with ultrasonic waves, respectively. Results showed the correlation between hydrogen storage capacity and specific surface area. The highest H2 storage value was obtained with carbon nanotube at 77 K. As a result, activated carbon and carbon nanotube can be used in hydrogen storage and therefore, the olive leaf can be converted into a high added value product in the energy field.

Nitrogen- and oxygen-containing activated carbons from sucrose for electrochemical supercapacitor applications

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 63000-63011 ◽  
Author(s):  
Navaladian Subramanian ◽  
Balasubramanian Viswanathan
Keyword(s):  
Ammonium Nitrate ◽  
Surface Area ◽  
Activated Carbons ◽  
High Surface ◽  
High Surface Area ◽  
Electrochemical Supercapacitor ◽  
Combustion Route ◽  
Supercapacitor Applications

High surface area nitrogen- and oxygen-containing activated carbons have been synthesized from sucrose and ammonium nitrateviacombustion route for supercapacitor applications.

scholarly journals Application of Experimental Design to Hydrogen Storage: Optimisation of Lignin-Derived Carbons

2019 ◽  
Vol 5 (4) ◽  
pp. 82 ◽  
Author(s):  
Jemma Rowlandson ◽  
James Coombs OBrien ◽  
Karen Edler ◽  
Mi Tian ◽  
Valeska Ting
Keyword(s):  
Hydrogen Storage ◽  
Pore Size ◽  
Surface Area ◽  
Activated Carbons ◽  
Average Pore Size ◽  
High Surface ◽  
Hydrogen Uptake ◽  
Synthesis Process ◽  
Average Pore ◽  
Small Pore

Lignin is a significant by-product of the paper pulping and biofuel industries. Upgrading lignin to a high-value product is essential for the economic viability of biorefineries for bioethanol production and environmentally benign pulping processes. In this work, the feasibility of lignin-derived activated carbons for hydrogen storage was studied using a Design of Experiments methodology, for a time and cost-efficient exploration of the synthesis process. Four factors (carbonisation temperature, activation temperature, carbonisation time, and activation time) were investigated simultaneously. Development of a mathematical model allowed the factors with the greatest impact to be identified using regression analysis for three responses: surface area, average pore size, and hydrogen uptake at 77 K and 1 bar. Maximising the surface area required activation conditions using the highest settings, however, a low carbonisation temperature was also revealed to be integral to prevent detrimental and excessive pore widening. A small pore size, vital for efficient hydrogen uptake, could be achieved by using low carbonisation temperature but also low activation temperatures. An optimum was achieved using the lowest carbonisation conditions (350 °C for 30 min) to retain a smaller pore size, followed by activation under the severest conditions (1000 °C for 60 min) to maximise surface area and hydrogen uptake. These conditions yielded a material with a high surface area of 1400 m2 g−1 and hydrogen uptake of 1.9 wt.% at 77 K and 1 bar.

scholarly journals Characterization of Carbon Materials for Hydrogen Storage and Compression

2020 ◽  
Vol 6 (3) ◽  
pp. 46
Author(s):  
Giuseppe Sdanghi ◽  
Rafael L. S. Canevesi ◽  
Alain Celzard ◽  
Matthias Thommes ◽  
Vanessa Fierro
Keyword(s):  
Hydrogen Storage ◽  
Surface Area ◽  
Density Functional ◽  
Carbon Materials ◽  
Hydrogen Adsorption ◽  
Activated Carbons ◽  
High Surface ◽  
Extensive Literature ◽  
Hydrogen Compression

Carbon materials have proven to be a suitable choice for hydrogen storage and, recently, for hydrogen compression. Their developed textural properties, such as large surface area and high microporosity, are essential features for hydrogen adsorption. In this work, we first review recent advances in the physisorption characterization of nanoporous carbon materials. Among them, approaches based on the density functional theory are considered now standard methods for obtaining a reliable assessment of the pore size distribution (PSD) over the whole range from narrow micropores to mesopores. Both a high surface area and ultramicropores (pore width < 0.7 nm) are needed to achieve significant hydrogen adsorption at pressures below 1 MPa and 77 K. However, due to the wide PSD typical of activated carbons, it follows from an extensive literature review that pressures above 3 MP are needed to reach maximum excess uptakes in the range of ca. 7 wt.%. Finally, we present the adsorption–desorption compression technology, allowing hydrogen to be compressed at 70 MPa by cooling/heating cycles between 77 and 298 K, and being an alternative to mechanical compressors. The cyclic, thermally driven hydrogen compression might open a new scenario within the vast field of hydrogen applications.

Structure and Interface Modification of Carbon Dots for Electrochemical Energy Application

Small ◽  
2021 ◽  
pp. 2102091
Author(s):  
Ruiqi Cheng ◽  
Yinger Xiang ◽  
Ruiting Guo ◽  
Lin Li ◽  
Guoqiang Zou ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Interface Modification ◽  
Energy Application ◽  
Electrochemical Energy

scholarly journals Correction: Cigarette butt-derived carbons have ultra-high surface area and unprecedented hydrogen storage capacity

2021 ◽  
Author(s):  
L. Scott Blankenship
Keyword(s):  
Hydrogen Storage ◽  
Surface Area ◽  
Storage Capacity ◽  
High Surface ◽  
High Surface Area ◽  
Hydrogen Storage Capacity ◽  
Cigarette Butt ◽  
Energy Environ

Correction for ‘Cigarette butt-derived carbons have ultra-high surface area and unprecedented hydrogen storage capacity’ by L. Scott Blankenship et al., Energy Environ. Sci., 2017, 10, 2552–2562, DOI: 10.1039/C7EE02616A.

scholarly journals Chemical modification of the polymer of intrinsic microporosity PIM-1 for enhanced hydrogen storage

Adsorption ◽  
2020 ◽  
Vol 26 (7) ◽  
pp. 1083-1091
Author(s):  
Mi Tian ◽  
Sébastien Rochat ◽  
Hamish Fawcett ◽  
Andrew D. Burrows ◽  
Christopher R. Bowen ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Surface Area ◽  
Hydrogen Adsorption ◽  
Sorption Properties ◽  
Bet Surface Area ◽  
Polymer Modification ◽  
Gas Sorption ◽  
Chemically Modified ◽  
Polymer Of Intrinsic Microporosity ◽  
Intrinsic Microporosity

Abstract A detailed investigation has been carried out of the pre-polymerisation modification of the polymer of intrinsic microporosity PIM-1 by the addition of two methyl (Me) groups to its spirobisindane unit to create a new chemically modified PIM-1 analogue, termed MePIM. Our work explores the effects of this modification on the porosity of PIM-1 and hence on its gas sorption properties. MePIM was successfully synthesised using either low (338 K) or high (423 K) temperature syntheses. It was observed that introduction of methyl groups to the spirobisindane part of PIM-1 generates additional microporous spaces, which significantly increases both surface area and hydrogen storage capacity. The BET surface area (N2 at 77 K) was increased by ~ 12.5%, resulting in a ~ 25% increase of hydrogen adsorption after modification. MePIM also maintains the advantages of good processability and thermal stability. This work provides new insights on a facile polymer modification that enables enhanced gas sorption properties.

scholarly journals Hydrogen uptake of high surface area-activated carbons doped with nitrogen

2013 ◽  
Vol 38 (25) ◽  
pp. 10453-10460 ◽  
Author(s):  
W. Zhao ◽  
V. Fierro ◽  
N. Fernández-Huerta ◽  
M.T. Izquierdo ◽  
A. Celzard
Keyword(s):  
Surface Area ◽  
Activated Carbons ◽  
High Surface ◽  
High Surface Area ◽  
Hydrogen Uptake
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