Extending the Electrochemical Stability Window of Ti 3 C 2 T z MXenes via Ta–Hf Co-Substitution for Durable Proton Exchange Membrane Fuel Cell Catalyst Supports

Key Points

• The aim is to enhance the electrochemical stability of Ti3C2Tz MXenes by using ta–hf co-substitution.
• Synthesize Ti3C2Tz MXenes with ta–hf co-substitution.
• Assess electrochemical stability through various tests.
• Evaluate the performance of MXenes as catalyst supports in proton exchange membrane fuel cells.
• Co-substituted MXenes exhibit a significantly improved electrochemical stability window.
• Enhanced durability observed in proton exchange membrane fuel cells using the modified MXenes.