1 research outputs found
Solvent-Free Process to Produce Three Dimensional Graphene Network with High Electrochemical Stability
Three-dimensional
(3D) graphene has attracted increasing attention
in electrochemical devices. However, the existing preparation technologies
usually involve a solvent process, which introduces defects and functional
groups into the 3D network. Here, we find the defects and functional
groups influence the electrochemical stability of graphene. After
an electrochemical process, the current decreases by more than 1 order
of magnitude, indicating remarkable etching of graphene. To improve
the electrochemical stability, we develop a solvent-free preparation
process to produce 3D graphene for the first time. After growth on
a 3D microporous copper by chemical vapor deposition (CVD), the copper
template is removed by a high temperature evaporation process, resulting
in 3D graphene network without any solvent process involved. The samples
exhibit remarkably improved stability with durable time 2 times, compared
with normal CVD samples, and 55 times, compared with reduced graphite
oxide, and no obvious etching is observed at 1.6 V versus saturated
calomel electrode, showing great potential for application in future
3D graphene-based high stable electrochemical devices