Flexible CoAl LDH@PEDOT core/shell nanoplatelet array for high-performance energy storage

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Layered double hydroxides (LDHs) are promising for energy storage but often suffer from poor conductivity.
• Poly(3,4-ethylenedioxythiophene) (PEDOT) is a conductive polymer with good electrochemical activity.
• Combining these materials could lead to synergistic improvements in pseudocapacitor performance.

Purpose of the Study:

• To synthesize and characterize a CoAl-LDH@PEDOT core/shell nanoplatelet array (NPA) on a flexible substrate.
• To evaluate the pseudocapacitive performance of the developed hybrid material.
• To investigate the synergistic effects contributing to enhanced energy storage.

Main Methods:

• Core/shell NPA synthesis via a combination of hydrothermal and in-situ polymerization methods.
• Electrochemical characterization including cyclic voltammetry (CV) and galvanostatic discharge (GCD).
• Assessment of rate capability and cycling stability.

Main Results:

• The CoAl-LDH@PEDOT core/shell NPA exhibited a maximum specific capacitance of 672 F/g.
• The electrode demonstrated excellent rate capability, achieving a specific energy of 39.4 Wh/kg at 40 A/g.
• High cycling stability was observed, retaining 92.5% capacitance after 5000 cycles.

Conclusions:

• The CoAl-LDH@PEDOT core/shell NPA offers significantly enhanced pseudocapacitor performance compared to individual components or conventional supercapacitors.
• The synergistic effect between the LDH core and PEDOT shell, along with the porous architecture, facilitates efficient electron and mass transport for superior energy storage.
• This hybrid material presents a promising candidate for high-performance flexible energy storage applications.