1 research outputs found
A Ferricyanide Anion-Philic Interface Induced by Boron Species within Carbon Framework for Efficient Charge Storage in Supercapacitors
Carbon materials with hierarchical porous structures
hold great
potential for redox electrolyte-enhanced supercapacitors. However,
restricted by the intrinsic inert and nonpolar characteristics of
carbon, the energy barrier of anchoring redox electrolytes on the
pore walls is relatively high. As such, the redox process at the interface
less occurs, and the rate of mass transfer is impaired, further leading
to a poor electrochemical performance. Here, a ferricyanide anion-philic
interface made of in situ inserted boron species into carbon rings
is constructed for enhanced charge storage in supercapacitors. Profiting
from the unique component-driven effects, the polar anchoring sites
on the pore wall can be built to grasp the charged redox ferricyanide
anion from the bulk electrolyte and promote the redox process; the
dynamics process is fastened correspondingly. Especially, the boron
atoms in BC2O and BCO2 units with higher positive
natural bond orbital values in the carbon skeleton are pinpointed
as intrinsic active sites to bind the negatively charged nitrogen
atoms in the ferricyanide anion via electrostatic interaction, confirmed
by density functional theoretical calculations. This will suppress
the shuttle and diffusion effects of the ferricyanide anion from the
surface of the electrode to the bulk electrolyte. Finally, the well-designed
PC-3 with high content of BC2O and BCO2 units
can reach 1099 F g–1 at 2 mV s–1, which is a more than 2-fold increase over boron-free units of carbon
(428 F g–1). The work offers a novel version for
designing high-performance carbon materials with unique yet reaction
species-philic effects