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2017 ; 7
(ä): 45585
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Bioinspired fractal electrodes for solar energy storages
#MMPMID28361924
Thekkekara LV
; Gu M
Sci Rep
2017[Mar]; 7
(ä): 45585
PMID28361924
show ga
Solar energy storage is an emerging technology which can promote the solar energy
as the primary source of electricity. Recent development of laser scribed
graphene electrodes exhibiting a high electrical conductivity have enabled a
green technology platform for supercapacitor-based energy storage, resulting in
cost-effective, environment-friendly features, and consequent readiness for
on-chip integration. Due to the limitation of the ion-accessible active porous
surface area, the energy densities of these supercapacitors are restricted below
~3?×?10(-3)?Whcm(-3). In this paper, we demonstrate a new design of biomimetic
laser scribed graphene electrodes for solar energy storage, which embraces the
structure of Fern leaves characterized by the geometric family of space filling
curves of fractals. This new conceptual design removes the limit of the
conventional planar supercapacitors by significantly increasing the ratio of
active surface area to volume of the new electrodes and reducing the electrolyte
ionic path. The attained energy density is thus significantly increased to
~10(-1)?Whcm(-3)- more than 30 times higher than that achievable by the planar
electrodes with ~95% coulombic efficiency of the solar energy storage. The energy
storages with these novel electrodes open the prospects of efficient self-powered
and solar-powered wearable, flexible and portable applications.