Biomass-derived grapene-like porous carbon nanoflakes for advanced
supercapacitor and hydrogen evolution reaction
Abstract
It is valuable that graphene-like porous carbon materials are prepared
from the biomass resources due to theirs porous structure, heteroatom,
and high specific surface area. Herein, we use egg white and graphene
oxides as precursor and employ post-hydrothermal carbonization approach,
freeze-drying technique, carbonization, and activation methods by KOH to
prepare the graphite carbon nanoflakes with Fe7C3@graphite carbon
nanoflakes hybrid materials. Morphology tests imply that the formation
of graphite carbon nanoflakes are mainly depended by activation step, it
implies that carbon flakes are exfoliated via introducing K+ into carbon
layers and further destroying the van der Waals force (VDWF). As a
result, this hybrid materials exhibit a attractive capacitance (528
mF·cm-2@1 mA·cm-2) and durability (91@10 mA·cm-2, 4000 cycles). For
hydrogen evolution reaction (HER), the as-collected samples also deliver
a low overpotential and remarkable stability. We believes that the
as-obtained hybrid materials have a greatly application value in energy
storage devices.