Recycled Anode Materials from Manufacturing Industry for Anion Exchange Membrane Water Electrolyzer

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Increasing demand for transition metals in energy sectors (batteries, fuel cells) drives up prices.
• Upcycling transition metal waste presents a sustainable strategy to mitigate resource scarcity and cost.
• Iron-based waste from the automotive industry is a potential resource for advanced materials.

Purpose of the Study:

• To develop a novel heterostructure electrocatalyst for anion exchange membrane water electrolysis (AEMWE).
• To upcycle iron-based waste from the automotive industry into a high-performance electrocatalyst.
• To investigate the role of the hetero-interface in enhancing catalytic activity.

Main Methods:

• Calcination of iron-based swarf to produce single-phase Fe2O3.
• Sequential hydrothermal synthesis to form Nickel Iron Layered Double Hydroxide (NiFe-LDH) on Fe2O3.
• Fabrication of NiFe-LDH/Fe2O3 heterostructured electrocatalysts.
• Electrochemical characterization for oxygen evolution reaction (OER) and AEMWE performance evaluation.

Main Results:

• Successfully synthesized NiFe-LDH/Fe2O3 heterostructured electrocatalysts from upcycled iron waste.
• The hetero-interface between NiFe-LDH and Fe2O3 significantly lowered the electrochemical activation barrier for OER.
• Achieved high-performance in anion exchange membrane water electrolysis (AEMWE).

Conclusions:

• Upcycling automotive iron waste is a viable route to produce advanced electrocatalysts.
• The NiFe-LDH/Fe2O3 heterostructure demonstrates excellent activity and stability for AEMWE.
• This approach offers a cost-effective and sustainable alternative for energy applications.