A highly
conductive and rationally constructed metal–organic
framework (MOF)-derived metal phosphide with a carbonaceous nanostructure
is a meticulous architecture toward the development of electrode materials
for energy storage devices. Herein, we report a facile strategy to
design and construct a new three-dimensional (3D) Cu-MOF via a solvent diffusion method at ambient temperature, which was
authenticated by a single-crystal X-ray diffraction study, revealing
a novel topology of (2,4,7)-connected three-nodal net named
smm
4. Nevertheless, the poor conductivity
of pristine MOFs is a major bottleneck hindering their capacitance.
To overcome this, we demonstrated an MOF-derived Cu
3
P/Cu@NC heterostructure via low-temperature
phosphorization of Cu-MOF. The electronic and ionic diffusion
kinetics in Cu
3
P/Cu@NC were improved due to the synergistic effects of the heterostructure.
The as-prepared Cu
3
P/Cu@NC heterostructure electrode delivers a specific capacity of 540 C
g–1 at 1 A g–1 with outstanding
rate performance (190 C g–1 at 20 A g–1) and cycle stability (91% capacity retention after 10,000 cycles).
Moreover, the assembled asymmetric solid-state supercapacitor (ASC)
achieved a high energy density/power density of 45.5 Wh kg–1/7.98 kW kg–1 with a wide operating voltage (1.6
V). Long-term stable capacity retention (87.2%) was accomplished after
5000 cycles. These robust electrochemical performances suggest that
the Cu
3
P/Cu@NC heterostructure
is a suitable electrode material for supercapacitor applications.