Carbon nanofibers as hydrogen adsorbing materials for power sources

Applications of nanotechnology in renewable energies—A comprehensive overview and understanding

“…Scientists have found that nanoblades could hold large volumes of hydrogen [24]. Also, it can be saved inside a nano-materials such as carbon nanotubes (CNTs) and carbon nanofibers [52][53][54][55][56][57]. For example, carbon nanotube fuel cells are being used nowadays to store hydrogen which are considered the environmentally friendly form of energy.…”

Synthesis of carbon-based nanomaterials and their application in pollution management

“…The common gases are acetylene, ethylene, methane, and propylene. Activated by dissolved KOH, the surface area of the CNFs increased 4-7 times (i.e., from 300-400 to 1700 m 2 g −1 ) (Figure 7) [34]. The most commonly used metal catalysts for CNFs growth are Fe, Co and Ni.…”

“…7 ). 34 The most commonly used metal catalysts for CNF growth are Fe, Co and Ni. Cr, V and Mo have also been studied.…”

Are Carbon Nanotubes Viable Materials for the Electrochemical Storage of Hydrogen?

“…13 Metal doping with nickel, copper, or gold reportedly gives increased storage capacities, up to 2.15 wt %, for various carbons. [14][15][16][17][18] There is uncertainty, however, over several aspects of the storage mechanism, namely, (i) whether physisorption or chemisorption processes dominate, (ii) the desorption mechanisms that occur, and (iii) not least, the actual electrochemical activity of carbon nanotubes. Niessen et al recently stated that SWNTs are essentially inert electrochemically and any storage capacity can be ascribed to metals present from residual catalyst or those added postgrowth.…”

“…Electrochemical charging of activated carbons in KOH has been investigated with hydrogen storage capacities up to 0.92 wt % reported, compared with 1.93 wt % for an ordered mesoporous carbon and 0.39 wt % for a single-walled nanotube (SWNT) mat, although higher values have been reported with purified SWNTs . Metal doping with nickel, copper, or gold reportedly gives increased storage capacities, up to 2.15 wt %, for various carbons. − There is uncertainty, however, over several aspects of the storage mechanism, namely, (i) whether physisorption or chemisorption processes dominate, (ii) the desorption mechanisms that occur, and (iii) not least, the actual electrochemical activity of carbon nanotubes. Niessen et al recently stated that SWNTs are essentially inert electrochemically and any storage capacity can be ascribed to metals present from residual catalyst or those added postgrowth …”