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

Abstract

Coupling hydroxides with highly conductive materials has become an effective means to solve their conductivity and stability issues in supercapacitors. Herein, a nanoflower nickel−vanadium layered double hydroxide/graphdiyne (NiV-LDHs/GDY) compound was obtained via a two-step strategy which corrected the shortcomings of poor electrical conductivity and stability of nanoflower NiV-LDHs. The nanoflower NiV-LDHs/GDY occupies a preferable mass-specific capacitance of 1397 F g −1 (1 A g −1 ), rate performance of 70.01% (20 A g −1 ), and durability of 100.00% after 5000 cycles compared to NiV-LDHs. In addition, the NiV-LDHs/GDY//AC ASC reveals a corresponding energy density of 35.42 Wh kg −1 (at a power density of 2602.43 W kg −1 ), and the corresponding energy storage capacity still stays at 80.52% after 6000 cycles. The performance improvement is mainly attributed to the introduction of GDY, which improves the pore structure and charge transfer capacity of NiV-LDHs. Hence, such considerable results suggest that nanoflower NiV-LDHs/GDY could be potential candidate materials for energy storage equipment.

Crumpled fibrous graphdiyne network decorated metal–organic framework: a promising heterostructure for improved energy storage performance

“…4f. The energy density of the ASC device was 43.3 W h kg −1 along with a power density of 807.6 W kg −1 , which were higher than those in the reported literature for GDY- and MOF-based composite electrodes, such as NiV-LDHs/GDY//AC (ED, 35.42 W h kg −1 ), 39 NiCo-LDHs@GDY//AC (ED, 23.06 W h kg − 1 ), 40 N-doped GDY (ED, 19.3 W h kg − 1 ) 41 GDY/PVA (ED 14 W h kg − 1 ), 42 MXene/GDY (ED, 19.7 W h kg − 1 ), 22 and BFGO (ED 24 W h kg − 1 ). 43 These results prove that these kinds of devices are capable of delivering high power performance along with high energy density.…”

In Situ Introduction of NiSe2 to Nickel–Chromium Layered Double Hydroxides for Promotive Aqueous System Asymmetric Supercapacitors

“…The fitting analysis shows that the initial resistances of Se-NiCr-LDHs-1 and NiCr-LDHs are 0.31 Ω, but in comparison to that of NiCr-LDHs (30.29 Ω), Se-NiCr-LDHs-1 (1.40 Ω) also has the lowest internal charge transfer resistance. By comparison of the internal charge transfer resistance of Se-NiCr-LDHs-1 and NiCr-LDHs before the cycle, the conductivity of Se-NiCr-LDHs-1 and NiCr-LDHs decreased with an increasing number of cycles, and the reduction of charge transfer resistance after a long cycle can be attributed to the activation process of the electrode material . It can be proven that the electrical conductivity and cyclic stability of the Se-NiCr-LDHs-1 electrode material are reliable compared to NiCr-LDHs.…”

“…The Se-NiCr-LDHs-1//AC ASC has two initial resistances of 0.35/1.22 Ω before and after the cycle; the Se-NiCr-LDHs-1//AC ASC has an internal charge transfer resistance of 5.81 Ω before cycling; and Se-NiCr-LDHs-1//AC ASC has an internal charge transfer resistance of 1.15 Ω after cycling. The results obviously show that the electrode material Se-NiCr-LDHs-1 is in an activated state with the Se-NiCr-LDHs-1//AC ASC cycle, and the stability and conductivity of the Se-NiCr-LDHs-1 material are reliable. The slight change in the stability of the Se-NiCr-LDHs-1//AC ASC cycle is obviously caused by the shortcomings of the assembly period, and it is believed that it will be surmounted in future industrial precision assembly.…”

“…By comparison of the internal charge transfer resistance of Se-NiCr-LDHs-1 and NiCr-LDHs before the cycle, the conductivity of Se-NiCr-LDHs-1 and NiCr-LDHs decreased with an increasing number of cycles, and the reduction of charge transfer resistance after a long cycle can be attributed to the activation process of the electrode material. 51 It can be proven that the electrical conductivity and cyclic stability of the Se-NiCr-LDHs-1 electrode material are reliable compared to NiCr-LDHs. In summary, the electrochemical properties of Se-NiCr-LDHs-1 and NiCr-LDHs in a threeelectrode system have been partially elucidated.…”

“…The power density (1063, 2234, 6802, 9200, and 11545 W kg −1 ) and energy density(33,31,26,25, and 23 Wh kg −1 ) of Se-NiCr-LDHs-1//AC ASC are calculated on the basis of the data of the corresponding mass-specific capacitance and the discharge time of the GCD curves. In comparison to the summary of NiMn-LDH/porous carbon//AC ASC, S−NiV-LDHs//AC ASC, 4M-P@NiCo LDH//AC ASC, NiV-LDHs/GDY//AC ASC, and NiCo-LDHs@GDY//AC ASC,53,54,51,55,56 the Ragone graph of Se-NiCr-LDHs-1//AC ASC was produced (Figure5h). To summarize, the flexible packaging asymmetric supercapacitor (Se-NiCr-LDHs-1//AC ASC) composed of the AC electrode and Se-NiCr-LDHs-1 electrode has certain innovations and novelty (Table…”