Hard carbons as a kind of nongraphitized amorphous carbon
have
been recognized as potential anode materials for sodium-ion batteries
(SIBs) due to its large interlayer spacing. However, the issues in
terms of onerous synthetic procedure and elusive working mechanism
remains critical bottlenecks for practical implement. Herein, we report
a facile production of tubular hard carbon through direct carbonization
of platanus flosses (FHC) for the first time. Through optimizing the
pyrolysis temperatures, the FHC obtained at 1300 °C possesses
a key balance between the interlayer spacing and surface area, which
can maintain the substantial active sites as well as reduce the irreversible
sodium storage. Accordingly, it can deliver a reversible capacity
of 324.6 mAh g–1 with a high initial Coulombic efficiency
of 80%, superb rate property of 107.2 mAh g–1 at
2 A g–1, and long operating stability over 1000
cycles. Furthermore, the in situ Raman spectroscopic
studies certify that sodium ions are stored in FHC following the “adsorption–insertion”
mechanism. Our study could provide a promising route for large-scale
development of the biomass-derived carbonaceous anodes for high-performance
SIBs.
Rational design of pre-catalysts is a powerful yet challenging strategy to realize high-efficient oxygen evolution reaction (OER) through electrochemical reconstruction. Herein, a well-designed pre-catalyst composed of nickel hexacyanoferrate (NiHCF) nanocubes...
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