It
is quite challenging to prepare subnanometer porous materials
from traditional porous precursors, and use of supramolecules as carbon
sources was seldom reported due to the complex preparation and purification
processes. We explore a facile one-pot method to fabricate supramolecular
coordination compounds as carbon sources. The resultant CB[6]-derived
carbons (CBC) have a high N content of 7.0–22.0%, surface area
of 552–861 m2 g–1, and subnano/mesopores.
The CBC electrodes have a narrow size distribution at 5.9 Å,
and the supercapacitor exhibits an energy density of 117.1 Wh kg–1 and a potential window of over 3.8 V in a two-electrode
system in the ionic liquid (MMIMBF4) electrolyte with appropriate
cationic (5.8 Å) and anionic (2.3 Å) diameter. This work
presents the facile fabrication of novel supermolecule cucurbituril
subnanoporous carbon materials and the smart design of “pores
and balls” for high-performance energy storage systems.
Polyoxometalates
(POMs) are known for their photocatalytic hydrogen
production activity, but their solubility and limited stability often
restrict their practical applications. Herein, we designed and solvothermally
synthesized two new Cu–H2bpz (3,3′,5,5′-tetramethyl-4,4′-bipyrazole,
abbreviated as H2bpz) compounds, namely, Cu0.5(H2bpz)(NO3) (1) and Cu(Hbpz)(Cl)·DMF
(2), and three new polyoxometalate-based Cu(II)-pyrazolate
compounds, namely, Cu(PW12O40)0.5(H2bpz)2(H2O)·(OH)0.5(H2O)5.5 (3), Cu(HPMo12O40)(H2bpz)2(H2O)2·(H2O)4 (4), and Cu2(SiW12O40)(H2bpz)3(H2O)3·(H2O)6 (5). Compound 3 (Cu(PW12O40)0.5(H2bpz)2(H2O)·(OH)0.5(H2O)5.5) exhibits the best photocatalytic
activity of 44.4 μ L h–1 g–1, which may be related to the stability of compounds. Herein, the
solvothermal method has been proven to be an effective method in synthesizing
stable organic–inorganic hybrid compounds with soluble POMs,
metal ions, and organic ligands. Thus, heterogeneous catalysts with
outstanding solar-light-driven photocatalytic properties were obtained.
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