Hierarchical MnCo-layered double hydroxides@Ni(OH)₂ core–shell heterostructures as advanced electrodes for supercapacitors

Abstract

Rational assembly and hetero-growth of hybrid structures consisting of multiple components with distinctive features are a promising and challenging strategy to develop materials for energy storage applications.

Metal–Organic Framework Templated 3D Hierarchical ZnCo2O4@Ni(OH)2 Core–Shell Nanosheet Arrays for High‐Performance Supercapacitors

“…The slope of the straight lines in the low frequency regiono fN yquistp lots represents the Warburg resistance (Z w ), and al arger slope of ZnCo 2 O 4 @Ni(OH) 2 /NF than Ni(OH) 2 /NF suggests the rapid ion diffusion from the electro-lyte to the electrode surfacea nd good capacitive characteristic of the core-shell electrode. [25] According to the above discussion, the excellent electrochemicalp erformance of the ZnCo 2 O 4 @Ni(OH) 2 /NF electrode could be ascribed to the 3D hierarchical core-shell nanosheet arrays structure and the synergistice ffectsb etween ZnCo 2 O 4 and Ni(OH) 2 ,a si llustrated in Figure 5. Firstly,t he MOF-derived porousZ nCo 2 O 4 nanosheets can not only provide highly exposed active sites and accelerated ion diffusion but also serve as ac onductive skeleton facilitating the electron transfer,a nd the ultrathin Ni(OH) 2 nanoflakes can afford more redox active sites and shortened ion diffusion pathways.…”

Emerging CoMn-LDH@MnO2 electrode materials assembled using nanosheets for flexible and foldable energy storage devices

“…The O 1 s spectra with three fitting Gaussian peaks ( Fig. 1 (c)) could be attributed to the O atoms in MnO 2 (Mn-O-Mn at 529.8 eV), in the hydroxyl group (Mn-O-H at 530.6 eV), and in the adsorbed water (H -O -H at 531.6 eV), respectively [38] . The Mn 2 p spectra in Fig.…”

“…The crystal structures of the as-prepared samples were studied first using XRD patterns, as showed in Fig. 1 [38] . Several diffraction peaks of MnO 2 (JCPDS no.12-0141) were found to appear in the hybrid structures, which confirms the successful preparation of our CoMn-LDH@MnO 2 samples.…”

Layered double hydroxide nanoarrays toward electrochemical energy storage and conversion

“…MnCo-LDH@Ni(OH)2/NF [52] 2.3 2320 (3 A g −1 ) 56.4% (30 A g −1 ) 90.9% (5000) Co(OH)2@PLDH/NF [48] 13.7 1734 (5 mA cm −2 ) 62% (50 mA cm −2 ) 85% (5000) http://engine.scichina.com/doi/10.1360/N032016-00227 源的再生利用提供了一种有效方案 [53,54] . 14~18] .…”