Synthesis of Ni–Co-Fe layered double hydroxide and Fe2O3/Graphene nanocomposites as actively materials for high electrochemical performance supercapacitors

Chemical Modifications of Layered Double Hydroxides in the Supercapacitor

“…[ 55 ] Some other electrode materials such as Ni 2 CoFe‐LDHs displayed high specific capacitance (3130 F g −1 at 1 A g −1 ). [ 56 ] Researchers found that the redox reactions were mainly contributed by the Ni and Co ions, but the results further uncovered that Fe 3+ is conducive to the penetration of OH − and boosts the charge transfer. The enhancement of specific capacitance was achieved, but the cycling stability was not desirable.…”

Cu-MOF derived Cu–C nanocomposites towards high performance electrochemical supercapacitors

“…However, there are fewer types of anodes, and the usual reports are porous carbons and ferric oxide. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Ferric oxide usually has poor electrical conductivity and needs to be combined with carbon materials, leading to reduction of its capacitance. Therefore, it is challenging to develop new anode materials with good conductivity and high capacitance.…”

Recent Progress in Two‐Dimensional Layered Double Hydroxides and Their Derivatives for Supercapacitors

“…Multimetal hydroxides can have advantages as ap ositive electrode over that of single-or double-metal hydroxidesb ecause they can greatly increaset he number of redox states,p roduce more electroactive sites, andpromote the overall electrochemical performance by properly tuning the composition and molar ratio of metal cations. [47] Ta ke the crystalline Ni 2 CoFe LDH as an example, [48] the electrode showed an ultrahigh specific capacitance of 3130Fg À1 at 1Ag À1 .T he redoxr eactions are mainly ascribed to Co and Ni, and the presence of Fe 3 + facilitates the penetration of OH À and accelerates ionic diffusion. In the charge/discharge process, Ni III and Co IV are formed on the basis of the synergistic effect by the coexistence of Ni, Co, and Fe, leadingt oa ne nhancement in specific capacitance.…”