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

Abstract

The vivacious surface chemistry and impressive electrical conductivity of MXene make it an alternative two-dimensional material for electrochemical energy storage. Herein, the Ni-based layered double hydroxides (LDHs) are hydrothermal in-situ...

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

“…Although the redox control capacitance ratio of Se-NiCr-LDHs-1 decreased in comparison to NiCr-LDHs, this can be attributed to the enhanced overall energy storage capacity achieved through the selenization strategy. The specific contribution from redox control or double-layer capacitance depends upon the intrinsic characteristics of the material itself . Undoubtedly, these findings hold significant implications for designing pseudocapacitor energy storage materials.…”

“…When the voltage window is 0–2.0 V, the polarization phenomenon is particularly obvious and the oxygen evolution reaction is more intense. Therefore, the voltage window of 0–1.8 V is selected as the best voltage window of Se-NiCr-LDHs-1//AC ASC for the electrochemical performance test. , Next, the CV curve of Se-NiCr-LDHs-1//AC ASC was tested at multiple scan rates (100, 50, 20, 10, and 5 mV s –1 ) in a voltage window of 0–1.8 V (Figure e). With the increase of the scanning rate, the area enclosed by the drawn CV curve also increases, and polarization does not occur at the high voltage value, indicating that no oxygen evolution reaction occurs.…”

“…The specific contribution from redox control or double-layer capacitance depends upon the intrinsic characteristics of the material itself. 47 Undoubtedly, these findings hold significant implications for designing pseudocapacitor energy storage materials. Moreover, it is worth noting that the scanning rate in eqs 4 and 5 is more suitable for small scanning rates (0.1−20 mV s −1 ), 48 and for the CV curves of NiCr-LDHs and Se-NiCr-LDHs-1 tests, a low CV curve scanning rate (5−20 mV s −1 ) was selected for analysis and calculation.…”

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

“…17 Through literature research and reports, 18 the performance test results of LDHs materials cannot reach theoretical electrochemical performance results. As a consequence, some scholars put forward the idea that LDHs materials can be combined with carbon, 19 graphene, 20,21 metal, 22 and conductive polymers to make up for the shortcomings of poor conductivity and stability of LDHs. 23 To overcome these problems, new graphene materials for supercapacitors have caught the attention of researchers.…”