posted on 2023-05-10, 12:07authored byGuorong Wang, Guiquan Liu, Zhiliang Jin
Vanadium-based
hydrotalcite materials have attracted much attention
in supercapacitor electrodes due to their polyvalent properties. Nevertheless,
the weak electrical conductivity of hydrotalcite limits its further
development. In order to overcome this problem, nanoflowers P-NiV-LDHs-8
and Se-NiV-LDHs-1 were obtained by ingenious modification on the surface
of nanoflower microlamellae of NiV-LDHs. Compared with Se-NiV-LDHs-x (x = 0.5, 2), P-NiV-LDHs-x (x = 4, 12), NiV-LDHs, Ni2P, and NiSe2, nanoflowers P-NiV-LDHs-8 and Se-NiV-LDHs-1 have better mass-specific
capacity and corresponding rate performances. The self-assembled P-NiV-LDHs-8//AC
and Se-NiV-LDHs-1//AC (AC = activated carbon) soft package devices
have relatively superior energy density and power density. Moreover,
the specific capacitance retention also maintains a relatively impressive
level. It is proven that the interfacial modification has a positive
effect on the energy storage performance of NiV-LDHs from the perspectives
of phosphating and selenizing.