Background: The research of innovative nanostructured materials will be helpful in
designing high performance supercapacitor devices in the near future. In this direction, graphenebased
structures, such as Vertically Oriented Graphene Nanosheets (VOGNs), have emerged as
promising architectures due to their interesting chemical, structural and electrochemical properties.
One of the main strategies to enhance the performance of supercapacitive materials consists of the
functionalization or modification of their surfaces by means of various approaches focused on doping
or the deposition of electroactive material coatings/films among others. Particularly, in this study, the
doping effect, by nitrogen plasma, on VOGNs was investigated as innovative electrodes for on-chip
Methods: Nitrogen-doped VOGNs (N-VOGNs) were characterised at morphological (SEM and TEM
techniques), structural (XPS and Raman techniques) and electrochemical levels, respectively.
Subsequently, the potential of such doped graphene nanostructure was evaluated in a symmetric
supercapacitor device using a coin cell configuration. The properties of the supercapacitor were
examined in terms of capacitance, energy and power density and lifetime.
Results: A maximal N-content of 17% was achieved for VOGNs with a vertical length around 370
nm, through exposure to a N2 microwave-plasma in an electron cyclotron resonance (ECR)-CVD
reactor. The deconvolution of N1s spectrum of N-VOGNs reflected the presence of three main peaks
corresponding to pyrrolic (400.2 eV), pyridinic (399.0 eV) and graphitic (401.2 eV) nitrogen forms,
demonstrating the incorporation of nitrogen into graphene structure. The doping effect reflected an
important impact on the morphological (surface defects and reactions, porosity) and structural
(conductivity) properties, which allowed to enhance greatly the capacitive properties compared to
Conclusion: N-VOGN based supercapacitors have demonstrated excellent capacitive properties such
as high volumetric energy (28 mWh cm-3) and power (360 W cm-3) densities as well as an
outstanding cycling stability (retention of 80% after 300 000 galvanostatic charge-discharge cycles).
These results are very promising compared to the state-of-the art dealing with carbonaceous structurebased
supercapacitors. Consequently, this study paves the way to explore the in-depth potential of
such nanostructure in the development of innovative high performance supercapacitors.