Layered
double hydroxides (LDHs) have attracted much attention
in supercapacitors because of the high specific surface area and theoretical
capacitance. However, the bad cycling stability has always been their
Achilles’ heel that restrains their further application. In
this paper, a small amount of unactive and single-valence element
zinc, which has no contribution to the capacitance of electrodes,
was first doped into NiCo-LDHs through two consecutive electrodeposition
processes only within 30 min. With a polyaniline (PANI) nanolayer
as the interlayer, an ultrathin NiCoZn-LDH nanoplate network was well-anchored
on the carbon cloth surface. The slight Zn2+ doping dramatically
enhanced the cycling performance of LDHs with little capacitance decay.
Zn2+ doping enhanced the cyclic structural stability of
NiCoZn-LDHs, while the PANI layer strengthened the interface interaction
between LDHs and the current collector. By controlling the doping
content of Zn2+ at 2.9%, the composite electrode achieved
the best performance with a high specific capacitance of 1749 F g–1 and an ultralong life span with 89% capacitance retention
after 40,000 charge–discharge cycles. This work offers a novel
strategy to fast build LDH-based supercapacitors with both high specific
capacitance and cycling performance.
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