10.1002/asia.201900296
Chemistry - An Asian Journal
COMMUNICATION
TPT-DAHQ COF exhibited excellent specific capacitance of 256
F g–1 at current density of 0.5 A g–1 which was decreased to 131
F g–1 when the current density was increased to 20 A g–1. This
excellent performance could be attributed to the higher surface
area (1855 m2 g–1) and the existence of mesoporosity (pore size
of 2.3 nm) along with the presence of heteroatoms (nitrogen and
oxygen), which enable easier accessibility of electrolytes to the
electrode surface.[24a,b] The reported specific surface area and
specific capacitance values are summarized in Table S4. The
durability of the TPT-DAHQ COF electrode was tested by
cycling at 10 A g–1 for 1850 cycles as shown in Figure 4d.
Remarkably, TPT-DAHQ COF showed excellent cycling stability
without obvious degradation of capacitance after 1850 cycles.
As shown in Figure 4d, the specific capacitance of the TPT-
DAHQ COF retains 98.8% of its original capacitance after 1850
cycles. Recently, Liao et al. reported COF-0d, COF-5d, and
Fe3O4/COF-5d having capacitances of 64, 52, and 112 F g–1 at
0.5 A g–1, respectively, which showed capacitance retention of
52, 77, and 76%, respectively, after 2000 cycles at 5 A g–1.[20a] In
addition, DeBlase et al. reported DAAQ-TFP COF with a
capacitance of 48 ± 10 F g–1 at 0.1 A g–1, which stabilized at 40 ±
9 Fg−1 after 10 GCD cycles, after which no further significant
decrease was observed after 5000 cycles.[11d] Bhanja et al.
reported TDFP-1 exhibiting a capacitance of 418 F g–1 at 0.5 A
inside-out Ostwald ripening, while the sponge-like surface of the
tubules was formed as a result of the non-interaction of the
crystallites on the outer surface. In the electrochemical
application, TPT-DAHQ COF exhibited
a
significant
supercapacitor performance—with high specific capacitance of
256 F g–1 at current density of 0.5 A g–1, excellent cycling
stability (98.8% capacitance retention for 1850 cycles), and high
energy density of 43 Wh kg–1. We totally believed that such
hollow structural COFs with sponge-like shells will open a great
domain for using such COFs as high-performance
supercapacitors in energy storage applications.
Keywords: triazine • benzobisoxazole • covalent organic
framework • sponge • supercapacitor
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In conclusion, we have report the successfully synthesis of
a hollow microtubular triazine- and benzobisoxazole-based
covalent organic framework—TPT-DAHQ COF with a sponge-
like shell—through a template-free [3+2] condensation of the
planar molecules TPT-3CHO and DAHQ-2HCl. The resultant
TPT-DAHQ COF exhibited high BET surface areas (up to ca.
1855 m2 g–1), excellent crystallinity, and high thermal stability (up
to ca. 450 °C). FE-SEM and TEM imaging were utilized to
investigated the mechanism of formation of the hollow
microtubular COF having a sponge-like shell by studying the
morphological changes in TPT-DAHQ COF at different times
during its preparation. This time-dependent study exhibited that
the hollow nature of the synthesized COF was controlled by
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