In
graphene-based materials, the energy storage capacity is usually
improved by rich porous structures with extremely high surface areas.
By utilizing surface corrugations, this work shows an alternative
strategy to activate graphene materials for large capacitance. We
demonstrate how to simply fabricate such activated graphene and how
these surface structures helped to realize considerable specific capacitance
(e.g., electrode capacitance of ∼340 F g–1 at 5 mV s–1 and a device capacitance of ∼343
F g–1 at 1.7 A g–1) and power
performance (e.g., power density of 50 and 2500 W kg–1 at an energy density of ∼10.7 and 1.53 Wh kg–1, respectively) in an aqueous system that are comparable to and even
better than those of highly activated graphene materials with ultrahigh
surface areas. This work demonstrates a path to enhance the capacity
of carbon-based materials, which could be developed and combined with
other systems for various improved energy storage applications.
Solar-driven interfacial photothermal
evaporation has
been recognized
as a green, economical, and efficient water purification technique
in recent years, and it is one of the most promising methods to realize
the supply of high-quality freshwater resources. The key and challenge
to achieving a superior water evaporation rate is to explore novel
stable materials with high light absorption and photothermal conversion
efficiency. In the present work, CoCr2O4 nanocrystals
containing a large number of oxygen vacancies have been successfully
prepared. Due to their substantial localized surface plasmon resonance
effect and excellent photothermal performance, they are applied in
the field of solar photothermal water evaporation for the first time.
Thanks to their extremely high photothermal effect and excellent hydrophilicity,
the outstanding water evaporation rate and efficiency of the obtained
CoCr2O4 nanoparticles under standard sun irradiation
are as high as 2.26 kg m–2 h–1 and 93.2%, respectively. This work provides an effective strategy
for the development of new solar-driven interfacial evaporation materials.
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