MOF-Mediated Construction of NiCoMn-LDH Nanoflakes Assembled Co(OH)F Nanorods for Improved Supercapacitive Performance

Abstract

The application of transition metal hydroxides has long been plagued by its poor conductivity and stability as well as severe aggregation tendency. In this paper, a novel hierarchical core–shell architecture, using an F-doped Co(OH)2 nanorod array (Co(OH)F) as the core and Mn/Ni co-doped Co(OH)2 nanosheets (NiCoMn-LDH) as the shell, was constructed via an MOF-mediated in situ generation method. The obtained Co(OH)F@ NiCoMn-LDH composites exhibited excellent supercapacitive performance with large specific capacitance as well as improved rate capability and long-term stability. The effect of the Ni/Mn ratio on the supercapacitive performance and energy storage kinetics was systematically investigated and the related mechanism was revealed.

Enhanced Energy Storage Performance through Controlled Composition and Synthesis of 3D Mixed Metal-Oxide Microspheres

“…The presence of the NiO phase is evident, as the Ni 2+ and Ni 3+ peaks contain two satellite peaks, 2p3/2 and 2p1/2, at approximately 861.6 and 878.8 eV. Similarly, the Co 2p spectrum (Figure 2f) displays two peaks at 779.7 and 794.5 eV, corresponding to the Co 2+ valence states for Co 2p3/2 and Co 2p1/2, respectively [44]. These diverse oxidation states make both NiO and Co2O3 promising electrocatalysts for electrochemical activities.…”

“…The optimal NiCo-75:25-to-AC mass ratio was approximately 1:1, with an overall weight of about 3.1 mg cm −2 . The energy density (ED) in Wh kg −1 and power density (PD) in W kg −1 of the ASC were calculated using specific relationships, as given in Equations ( 3) and ( 4) [44].…”

“…The energy density (ED) in Wh kg −1 and power density (PD) in W kg −1 of the ASC were calculated using specific relationships, as given in Equations ( 3) and ( 4) [44].…”