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

Abstract

In the present work, cobalt aluminum layered double hydroxide and its derivatives were synthesized via hydrothermal method, alkali-etching method and phosphorization route to obtain different crystal phases. The structure, morphology...

Ce3+ ion regulated CoNi-hydroxides for ultrahigh charge rate supercapacitors

“…Compared with low specific capacitance in carbon-based materials, metal oxides and hydroxides, the most studied pseudocapacitance electrode materials often show high specific capacitance. [7][8][9] The charge storage mechanism of pseudocapacitive materials included surface electron transfer of central cations coupled with the insertion/deinsertion of H + , Li + , Na + , or K + ions, for example, Mn IV O 2 + xLi + + xe − → Li x (Mn III Mn IV )O 2 . However, these materials often suffer from intrinsically low conductivity owing to their semiconductor nature.…”

Microwave Absorption of α-Fe2O3@diatomite Composites

“…Therefore, on the basis of the existing research, the light and porous structure of diatomite (De) is used to load a rough sea urchin-like structure of α-Fe 2 O 3 . Hollow micro-spheres and micro-organisms were used as templates to prepare ferrite particles decorated with De through the hydrothermal method [ 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. De has the excellent characteristics of biological diatoms and a unique pore structure [ 38 ].…”

Facile synthesis of a 2D multilayer core–shell MnO2@LDH@MMT composite with a nanoflower shape for electromagnetic wave absorption

“…The structural unit is formed by two silica-oxygen tetrahedral lamellae sandwiched between aluminum-oxygen octahedral lamellae, and the tetrahedral and octahedral lamellae are connected by oxygen atoms; 31 as a carrier for nanomaterials, it has a large specific surface area (240 m 2 g −1 ), allowing LDH and MnO 2 to be dispersed well and constructed into nanoflower-like functional materials, which helps to improve the material's EW absorption properties. At present, LDH@MMT is widely applied in adsorption, catalysis, electrochemistry, 32 and environmental 33 and energy fields. 34 In this work, a two-dimensional multilayer core-shell nanoflower-like structure of a clay mineral-based composite was constructed by a two-step hydrothermal method to obtain MNFM from cationic clay (MMT), anionic clay (LDH), and δ-MnO 2 .…”