Electrochemical activation of carbon nanowalls

N-Doped Carbon NanoWalls for Power Sources

“…Results show that glow-discharge plasma modification leads to an improvement in specific electrochemical capacitance from 104 F g −1 to 464 F g −1 . These results are in a good agreement with work 4 . Thus, the plasma treatment process leads to an increase in specific capacitance of structures by a factor of 4.5.…”

“…CNWs can be synthesized on the surface of different metals, semiconductors, carbon materials such as carbon paper and carbon fiber, thus allowing to fabricate flexible energy sources 11 . However, despite the fact that specific surface area of CNW amounts up to 1000 m 2 g −1 5 , its specific capacitance reaches values of ~120 F g −1 4 . In order to increase specific capacitance of carbon materials, various metals oxide decoration methods are applied and, as a result, specific capacitance values of the structures are electrochemically enhanced by several times 12,13 .…”

“…Earlier, our team published a paper on electrochemical activation of CNWs synthesized by Direct Current Plasma Enhanced Chemical Vapor Deposition (DC PECVD) 3 . The electrochemical activation led to an increase in electrode specific capacitance from 105 F g −1 to 120 F g −1 4 . The composite electrode based on CNW@Si@CNW or CNW@Ge@CNW shows good stability and can be used to produce thin-film Li-ion batteries 5,6 , fabricate fuel cells 7 or serve as a template for other catalytic materials 8 .…”

The synthesis of graphene nanowalls on a diamond film on a silicon substrate by direct-current plasma chemical vapor deposition

“…Since the CVD diamond film is mostly covered by high-density curved graphene nanowalls, the small diamond peak at 1332cm -1 is attributed to some exposed areas of CVD diamond among neighboring interconnected graphene nanowalls. This observation further demonstrates that graphene nanowalls grow on the CVD diamond film without an 20 interfacial layer of amorphous carbon. This fact will be further examined by electrochemical reactions with an electrolyte of the graphene nanowalls grown on a CVD diamond film.…”

“…The edge can be very thin and made of only one or few layers of graphene [19,20]. The actual thickness of a graphene nanowall depends on the growth temperature and the growth time, among other synthesis conditions.…”