Construction of 2D ZIF-derived hierarchical and hollow NiCo-LDH “nanosheet-on-nanosheet” arrays on reduced graphene oxide/Ni foam for boosted electrochemical energy storage

Atomic scale modulation strategies and crystal phase transition of flower-like CoAl layered double hydroxides for supercapacitors

“…The b value for the anodic peak equals 0.90635, while that for the cathodic peak equals 0.82791. On the basis of electrochemical type judgment, 18 it is indicated that the CoAl LDH exhibits both battery-type and pseudocapacitance-type behavior owing to the value of b being between 0.5 and 1. Therefore, the energy storage mechanism of CoAl LDH is composed of the faradaic surface redox reaction and the non-faradaic electric double layer effect.…”

“…Layered double hydroxides (LDHs), as a newly developed electrode material from transition metals with marvelous 2D layered structures such as CoAl-LDH, 16 NiCo-LDH, 17,18 NiFe-LDH, 19 NiAl LDH 20 and NiMn-LDH, 21 have been the focus of a good deal of studies in recent years. Among them, Al-based LDHs like CoAl LDH are optimal candidates due to aluminum (Al) being an amphoteric metal, which can be removed with an acid or alkali.…”

Constructing Co(OH)F Nanorods@NiCo‐LDH Nanocages Derived from ZIF‐67 for High‐Performance Supercapacitors

“…Additionally, the energy and power densities of Co(OH)F@ NiCo-LDH//RGO system are also calculated from the above device performance. At the power density of 865 W kg −1 , the energy density of Co(OH)F@NiCo-LDH//RGO device can reach 49.34 Wh kg −1 and still keeps 30.56 Wh kg −1 at the high power density of 4868 W kg −1 , exceeding those of some previously reported electrochemical devices, such as CNT@ NiCo-LDH (750 W kg −1 , 37.4 Wh kg −1 ), [26] MnO 2 @Co-Ni LDH// AC (4800 W kg −1 , 21.3 Wh kg −1 ), [29] Co-Co LDH/C/Ni (OH) 2 -50//AC (75 W kg −1 , 42.9 Wh kg −1 ), [45] NiCo-LDH@rGO//AC (235.5 W kg −1 , 32.2 Wh kg −1 ), [46] Co-Mn LDH/NF//AC (2500 W kg −1 , 4.4 Wh kg −1 ), [47] and NiCoMn-OH//AC (7900 W kg −1 , 23 Wh kg −1 ). [24] The long-term cycling performance of Co(OH)F@NiCo-LDH//RGO device at 10 A g −1 is shown in Figure 7(e).…”

MOF-derived hierarchical core–shell hollow Co3S4@NiCo2O4 nanosheet arrays for asymmetric supercapacitors

“…26,27 rGO has rich oxygencontaining groups, which not only increase the hydrophilicity, facilitating the growth of the MOF but also provide additional redox reactions to improve the electrochemical performance. 28 Secondly, ZIF-L was grown in situ on rGO/NF under ambient conditions, and 2D hollow Co 3 S 4 nanoarrays were obtained by the hydrothermal sulfurization of ZIF-L. Finally, NiCo 2 O 4 nanosheets were constructed on the surface of Co 3 S 4 to form a hierarchical core-shell structure.…”