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Volume 08
Innovative Energy & Research
ISSN: 2576-1463
Advanced Energy Materials 2019
July 11-12, 2019
July 11-12, 2019 | Zurich, Switzerland
21
st
International Conference on
Advanced Energy Materials and Research
Synthesis of vertical graphene network as platform for electrochemical applications
Mineo Hiramatsu
Meijo University, Japan
G
raphene based materials such as carbon nanotube and graphene sheet itself have a wide range of possible
applications. Among these grapheme based materials, carbon nanowalls (CNWs) are self- supported network
of few-layer graphenes standing almost vertically on the substrate to form 3-dimensional structure. The maze-
like architecture of CNWs with large-surface area graphene planes would be useful as electrodes for energy
storage devices, electrochemical and biosensors and scaffold for cell culturing. CNWs and related materials can
be synthesized by several plasma enhanced chemical vapor deposition (PECVD) techniques on heated substrates
employing CH
4
and H
2
mixtures. Control of CNW structures including spacing between adjacent nanowalls and
crystallinity is significant for the practical applications. Moreover, surface functionalization including surface
termination and decoration with catalytic metal nanoparticles should be established. We report the current status of
fabrication and structure control of CNWs using several PECVD techniques. Moreover, CNW surface was decorated
with Pt nanoparticles by the reduction of chloroplatinic acid or by the metal-organic chemical deposition employing
supercritical fluid. We also report the performances of hydrogen peroxide (H
2
O
2
) sensor and fuel cell, where CNW
electrode was used. For the H
2
O
2
sensing application, CNWs were grown on carbon fiber paper (CFP) using PECVD
with CH
4
/Ar mixture to increase the surface area. Then, CNW surface was decorated with Pt nanoparticles by the
reduction of H
2
PtCl
6
in solution. Cyclic voltammetry results showed that the Pt-decorated CNWs/CFP electrode
exhibited excellent electrocatalytic activity to the reduction of H
2
O
2
. Similar structure was also used as a catalytic
layer of the polymer electrolyte fuel cell. From the electrochemical investigation, Pt-decorated CNWs showed
excellent electrochemical durability compared with the carbon black. Electrochemical experiments demonstrate that
platform based on vertical nanographene offers great promise for providing a new class of nanostructured electrodes
for electrochemical sensing and energy conversion applications.
Recent Publications
1. Imai S, Kondo H, Hyungjun C, Ishikawa K, Tsutsumi T, Sekine M, Hiramatsu M and Hori M (2019) Pt
nanoparticle-supported carbon nanowalls electrode with improved durability for fuel cell applications using
C
2
F
6
/H
2
plasma-enhanced chemical vapor deposition. Applied Physics Express 12:015001.
Mineo Hiramatsu, Innov Ener Res 2019, Volume 08