Nanostructured manganese oxide/carbon nanotubes, graphene and graphene oxide as water-oxidizing composites in artificial photosynthesis

2014 ◽  
Vol 43 (28) ◽  
pp. 10866-10876 ◽  
Author(s):  
Mohammad Mahdi Najafpour ◽  
Fahime Rahimi ◽  
Maryam Fathollahzadeh ◽  
Behzad Haghighi ◽  
Małgorzata Hołyńska ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Manganese Oxide ◽  
Carbon Nanostructures ◽  
Artificial Photosynthesis ◽  
Mn Oxide

Nano-sized Mn oxide/carbon nanostructures as water-oxidizing catalyts are reported.

Microstructure and Properties of Aminated Carbon Nanotubes/Graphene Oxide-MnO2 Composite for Supercapacitor Electrodes

2018 ◽  
Vol 777 ◽  
pp. 196-204 ◽  
Author(s):  
Zhen Ye Zhu
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Manganese Oxide ◽  
Isopropyl Alcohol ◽  
Diffusion Rate ◽  
Defect Structures ◽  
Chemical Route ◽  
Rate Of Reaction ◽  
Discharge Curve ◽  
The Right

MWCNTs-NH2/GO-MnO2 composites with different feeding ratio are synthesized by a simple soft chemical route in water-isopropyl alcohol. By amination treatment, carbon nanotubes become more dispersed, thinner and more uniform, and more defect structures are found in MWCNTs-NH2. MWCNTs-NH2 grows on the surface of graphene. nanomanganese oxide homogeneously coats on the surfaces of carbon nanotubes and graphene Oxide. Specific capacitances of MWCNTs-NH2/GO-MnO2 composite calculated by galvanostatic charge/discharge curve were 286.33 F/g at current density 1A·g-1 when feeding ratio is 1:1:6. With the increase of the content of manganese oxide, Nyquist semicircle of EIS parallel shifts to the right and the slash slope of EIS is gradually flat, indicating that resistance increases. When the feeding ratio is equal to 1:1:15, the resistance reaches the maximum. The phenomenon may ascribe to the agglomerate of manganese oxide, which hinders the diffusion rate of reaction ions and causes the increase of resistance.

scholarly journals Waterborne Graphene- and Nanocellulose-Based Inks for Functional Conductive Films and 3D Structures

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1435
Author(s):  
Jose M. González-Domínguez ◽  
Alejandro Baigorri ◽  
Miguel Á. Álvarez-Sánchez ◽  
Eduardo Colom ◽  
Belén Villacampa ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Carbon Nanostructures ◽  
Carbon Nanomaterials ◽  
Electronic Device ◽  
Aqueous Media ◽  
High Viscosity ◽  
Resistance Surface ◽  
Conductive Films ◽  
Low Viscosity

In the vast field of conductive inks, graphene-based nanomaterials, including chemical derivatives such as graphene oxide as well as carbon nanotubes, offer important advantages as per their excellent physical properties. However, inks filled with carbon nanostructures are usually based on toxic and contaminating organic solvents or surfactants, posing serious health and environmental risks. Water is the most desirable medium for any envisioned application, thus, in this context, nanocellulose, an emerging nanomaterial, enables the dispersion of carbon nanomaterials in aqueous media within a sustainable and environmentally friendly scenario. In this work, we present the development of water-based inks made of a ternary system (graphene oxide, carbon nanotubes and nanocellulose) employing an autoclave method. Upon controlling the experimental variables, low-viscosity inks, high-viscosity pastes or self-standing hydrogels can be obtained in a tailored way. The resulting inks and pastes are further processed by spray- or rod-coating technologies into conductive films, and the hydrogels can be turned into aerogels by freeze-drying. The film properties, with respect to electrical surface resistance, surface morphology and robustness, present favorable opportunities as metal-free conductive layers in liquid-phase processed electronic device structures.

scholarly journals DABCO Derived Nitrogen-Doped Carbon Nanotubes for Oxygen Reduction Reaction (ORR) and Removal of Hexavalent Chromium from Contaminated Water

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2871
Author(s):  
Vadahanambi Sridhar ◽  
Hyun Park
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Hexavalent Chromium ◽  
Carbon Nanostructures ◽  
Reduction Reaction ◽  
Scale Production ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

Though chemically-derived reduced graphene oxide (CDG) from graphite oxide (GO) precursors is a widely practiced procedure for the large-scale production of graphene, the quality and quantity of thus obtained CDG is dependent on the reduction strategy used. In this work, we report an all-solid-state, residue-free, microwave process for the reduction of graphene oxide and subsequent growth of carbon nanotube ‘separators’ from a single precursor, namely DABCO (1,4-diazabicyclo[2.2.2]octane). The utility of our newly developed technique in efficiently and effectively reducing graphene oxide and in growing nitrogen-doped carbon nanotubes via catalysts like palladium and iron into unique mesoporous, 3-D hierarchical carbon nanostructures is demonstrated. The applicability of the thus obtained palladium embedded in Pd@NCNT-rGO nanoarchitectures for the oxygen reduction reaction (ORR) is investigated. When carbon fiber (CF) was used as the substrate, three-dimensional Fe@NCNT-CF were obtained, whose capability as versatile adsorbents for hexavalent chromium ion removal from contaminated waters was also demonstrated.

scholarly journals Reinforced 3D Composite Structures of γ-, α-Al2O3 with Carbon Nanotubes and Reduced GO Ribbons Printed from Boehmite Gels

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2111
Author(s):  
Cristina Ramírez ◽  
Manuel Belmonte ◽  
Pilar Miranzo ◽  
Maria Isabel Osendi
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Composite Structures ◽  
Carbon Nanostructures ◽  
Relative Increase ◽  
High Porosity ◽  
Compression Tests ◽  
Reduced Graphene ◽  
Α Al2o3

The ability of boehmite to form printable inks has sparked interest in the manufacturing of 3D alumina (Al2O3) and composite structures by enabling direct ink writing methods while avoiding the use of printing additives. These materials may exhibit high porosity due to the printing and sintering procedures, depending on the intended application. The 3D-printed porous composite structures of γ-Al2O3 and α-Al2O3 containing 2 wt.% of carbon nanotubes or reduced graphene oxide ribbons were fabricated from boehmite gels, followed by different heat treatments. The reinforcing effect of these carbon nanostructures was evidenced by compression tests carried out on the different alumina structures. A maximum relative increase of 50% in compressive strength was achieved for the γ-Al2O3 composite structure reinforced with reduced graphene oxide ribbons, which was also accompanied by an increase in the specific surface area.

Remarkable Stability of Supercapacitor Material Synthesized by Manganese Oxide Filled in Multiwalled Carbon Nanotubes

2010 ◽  
Vol 6 (5) ◽  
pp. 553-559 ◽  
Author(s):  
Meisam Kiamahalleh ◽  
Suhairi Sata ◽  
Surani Buniran ◽  
Sharif Sharif Zein
Keyword(s):  
Carbon Nanotubes ◽  
Manganese Oxide ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon
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