Highly Uniform Carbon Sheets with Orientation-Adjustable Ordered Mesopores

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Ordered mesoporous carbon materials are crucial for advanced energy storage devices.
• Controlling pore structure and orientation is key to optimizing electrochemical performance.
• Existing synthesis methods often lack control over mesopore alignment within carbon nanostructures.

Purpose of the Study:

• To develop a novel synthesis route for free-standing ordered mesoporous carbon sheets (OMCSs).
• To investigate the influence of template interactions on mesopore array orientation (vertical vs. horizontal).
• To correlate the mesopore orientation with electrochemical energy storage performance in different supercapacitor architectures.

Main Methods:

• Utilized a soft-hard template strategy employing MgAl-layered double hydroxide (MgAl-LDH) as the hard template and triblock copolymer F127 as the soft template.
• Employed phenolic resols as carbon precursors for the synthesis of OMCSs.
• Fabricated and tested supercapacitors in both all-solid-state and micro-supercapacitor configurations to evaluate OMCS performance.

Main Results:

• Successfully synthesized free-standing OMCSs with uniform hexagonal morphology and controllable mesopore alignment.
• Demonstrated that MgAl-LDH surface chemistry directs the morphology of carbon precursor micelles, leading to vertical or horizontal mesopore arrays.
• OMCSs with vertical mesopores exhibited superior performance in all-solid-state supercapacitors, while those with horizontal mesopores excelled in micro-supercapacitors.

Conclusions:

• The developed soft-hard template method enables the creation of OMCSs with orientation-tunable mesopore arrays.
• Mesopore orientation is a critical factor determining electrochemical energy storage behavior, dependent on the supercapacitor configuration.
• This work provides a pathway for designing advanced carbon materials for tailored energy storage applications.