Interfacial Modification to Nanoflower-Like NiV-Layered Double Hydroxide for Enhancing Supercapacitor Performance

Abstract

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, Ni 2 P, and NiSe 2 , 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.

Temporal Evolution of Morphology, Composition, and Structure in the Formation of Colloidal High-Entropy Intermetallic Nanoparticles

“…These nanoflowers appear to have sheet-like protrusions that emanate from a central core. This morphology is frequently observed for colloidal nanoparticles of layered materials, such as transition metal chalcogenides and layered oxides and hydroxides, but is much less common for the metals, alloys, and intermetallics that are related to (Pd,Rh,Ir,Pt)­Sn. The other subpopulation (cyan box) contains smaller particles having average diameters of 20–30 nm.…”

Graphdiyne-Modified NiV-Layered Double Hydroxide Nanostructures for Supercapacitor Applications

“…In V 2p 3/2 of NiV-LDHs, the binding energy at 518.17 eV, 517.09 and 516.48 eV can be attributed to the prominent peaks of V 5+ , V 4+ , and V 3+ , respectively. In V 2p 3/2 of NiV-LDHs/GDY, the binding energy at 518.14, 517.12, and 516.31 eV can be attributed to the prominent peaks of V 5+ , V 4+ , and V 3+ , respectively. , …”

In situ coupled nickel-based layered double hydroxides with MXene to enhance supercapacitor performance

“…20 The planes at (110), (009), (006) and (003) of NiV-LDHs (NiV-LDHs PDF#052-1627) corresponded to the characteristic diffraction peaks at 60.05°, 34.29°, 23.36° and 11.56°, respectively. 37 Interestingly, the (110), (009), (006) and (003) crystal faces of Ti 3 C 2 @NiV-LDHs could be considered to extend from the crystal faces of NiV-LDHs, and could be attributed to the diffraction peaks of Ti 3 C 2 @NiV-LDHs at 61.06°, 34.66°, 23.21° and 11.57°, respectively. The characteristic diffraction peaks of 9.09°, 18.25°, 26.70°, 34.70° and 61.05° in the X-ray polycrystal diffraction analysis of Ti 3 C 2 @NiV-LDHs corresponded to the crystal planes of (002), (004), (006), (008) and (110) of Ti 3 C 2 , respectively.…”

“…Then, the PTFE lining was sealed in a high-pressure reactor and the reaction was carried out for 12 h at 120 1C. 37 Thereafter, NiV-LDHs were obtained by centrifugal drying. In the PTFE lining, Ni(NO 3 ) 2 Á6H 2 O (0.582 g), ethanol (70%, 50 mL) and Co(NO 3 ) 2 Á6H 2 O (0.874 g) were dispersed evenly, then the PTFE lining was sealed in a high-pressure reactor.…”