Layered Double Hydroxide Hollowcages with Adjustable Layer Spacing for High Performance Hybrid Supercapacitor

Abstract

Layered double hydroxides (LDHs) have been considered as promising electrodes for supercapacitors due to their adjustable composition, designable function and superior high theoretic capacity. However, their experimental specific capacity is significantly lower than the theoretical value due to their small interlayer spacing. Therefore, obtaining large interlayer spacing through the intercalation of large‐sized anions is an important means to improve capacity performance. Herein, a metal organic framework derived cobalt‐nickel layered double hydroxide hollowcage intercalated with different concentrations of 1,4‐benzenedicarboxylic acid (H2BDC) through in‐situ cationic etching and organic ligand intercalation method is designed and fabricated. The superior specific capacity and excellent rate performance are benefit from the large specific surface area of the hollow structure and increasing interlayer spacing of LDH after H2BDC intercalation. The sample with the largest layer spacing displays a maximum specific capacity of 229 mA h g−1 at 1 A g−1. In addition, the hybrid supercapacitor assembled from the sample with the largest layer spacing and active carbon electrode has a maximum specific capacity of 158 mA h g−1 at 1 A g−1; the energy density is as high as 126.4 W h kg−1 at 800 W kg−1 and good cycle stability.

A high-performance hybrid supercapacitor by encapsulating binder-less FeCoSe2 nanosheets@NiCoSe2 nanoflowers in a graphene network

“…19,20 The battery-like materials should possess copious electroactive sites for faradaic redox reactions, enough conductivity for effective charge transfer, a highly porous nature for rapid ion transport, and a high surface area for charge storage. 21 Among the various battery-like cathode materials, layered double hydroxides (LDHs) such as FeCo-LDH, 22 MnCo-LDH, 23 and NiCo-LDH 24 are the most promising candidates due to their several advantages such as good anion exchanging ability, good redox activities, environmental friendliness, superior anionexchanging ability, and low cost. 25 However, utilization of LDHs as cathode materials is still limited owing to their sluggish kinetics behavior, which leads to a low capacity and structural instability.…”

“…Among the various battery-like cathode materials, layered double hydroxides (LDHs) such as FeCo-LDH, 22 MnCo-LDH, 23 and NiCo-LDH 24 are the most promising candidates due to their several advantages such as good anion exchanging ability, good redox activities, environmental friendliness, superior anion-exchanging ability, and low cost. 25 However, utilization of LDHs as cathode materials is still limited owing to their sluggish kinetics behavior, which leads to a low capacity and structural instability.…”

A VO3−-induced S2−-exchange strategy to controllably construct a sub-nano-sulfide-functionalized layered double hydroxide for an enhanced supercapacitor performance

“…[15][16][17][18] However, the narrow interlayer spacing (r1 nm) and poor conductivity of LDHs have limited the enhancement of their supercapacitor performance. 19,20 Therefore, the rational design and function of LDHs with rich channels and enhanced conductivity is necessary to satisfy the mass-transfer requirements of electrolytes and electrons for fast and deep redox reactions, which is a challenge, as well as an opportunity, in this field. 21 Numerous effective strategies have been proposed to guide the design and function of LDH materials for an enhanced supercapacitor performance, and these can be divided into two categories.…”

Insight into the decay mechanism of cycling capacitance for layered double hydroxides at subnanometer scale

“…1–3 In alkaline electrolytes, the LDHs can realize charge storage/delivery based on the reversible redox reaction between hydroxides and oxyhydroxides. 4–8 Benefiting from the high theoretical capacitances, low cost, and mass production, LDHs have become attractive electrode materials for supercapacitors. 9–13…”

“…[1][2][3] In alkaline electrolytes, the LDHs can realize charge storage/delivery based on the reversible redox reaction between hydroxides and oxyhydroxides. [4][5][6][7][8] Benefiting from the high theoretical capacitances, low cost, and mass production, LDHs have become attractive electrode materials for supercapacitors. [9][10][11][12][13] As is known, high capacitance, high rate capability and longterm cycling stability are key parameters for electrode materials of supercapacitors.…”