Composite MAX phase/MXene/Ni electrodes with a porous 3D structure for hydrogen evolution and energy storage...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Two-dimensional (2D) MXenes show promise for energy applications like water splitting.
• Current limitations include challenges in preparation and environmental stability, hindering industrial use.

Purpose of the Study:

• To propose a simple, inexpensive method for creating composite electrodes using MAX phases and MXene.
• To enhance the stability and electrocatalytic activity of MXene-based materials for hydrogen evolution.

Main Methods:

• Modification of molybdenum- and titanium-containing MAX phases with metallic Ni.
• Tuning Al and carbon content, and synthesis conditions.
• Fluoride-free etching under alkaline conditions to produce composite electrodes.

Main Results:

• Successful fabrication of composite electrodes with a 3D porous MAX phase support for MXene.
• Electrodes demonstrated high electrochemical activity for the hydrogen evolution reaction (HER).
• Achieved a relatively high areal capacitance of up to 10 F cm⁻².

Conclusions:

• The proposed method offers a cost-effective approach to producing stable and active MXene-based composite electrodes.
• These materials are promising for green hydrogen production via water splitting.
• The 3D porous structure enhances electrocatalytic performance and mechanical integrity.