Self-Templated Metal Glycerolate-Derived Trimetallic Layered Double Hydroxides with Tunable Metal Cation...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Layered double hydroxides (LDHs) show promise for electrochemical energy storage but suffer from low conductivity and poor stability.
• Surface modification and composition engineering are crucial for improving LDH performance in supercapacitors.

Purpose of the Study:

• To synthesize flower-like trimetallic manganese nickel cobalt-layered double hydroxide (MnNiCo-LDH) using a metal glycerolate template.
• To investigate the effect of manganese concentration on the structural and electrochemical properties of MnNiCo-LDH.
• To evaluate the performance of MnNiCo-LDH in an asymmetric supercapacitor (ASC).

Main Methods:

• Synthesis of NiCo-bimetal glycerolate spheres via solvothermal method.
• Preparation of MnNiCo-LDH using magnetic stirring with varying Mn concentrations.
• Fabrication of an asymmetric supercapacitor using MnNiCo-LDH and graphene electrodes.

Main Results:

• Optimized MnNiCo-LDH exhibited a high specific capacitance of 871.2 F/g at 20 mV/s.
• The ASC device achieved an energy density of 36.9 Wh/kg at 473.4 W/kg.
• The ASC demonstrated excellent cycling stability, retaining 95.2% capacitance after 10,000 cycles.

Conclusions:

• Flower-like trimetallic MnNiCo-LDH derived from metal glycerolate is a promising electrode material for supercapacitors.
• The developed material offers high energy density and superior cycling stability for energy storage applications.
• This study demonstrates an effective strategy for enhancing LDH performance through composition engineering.