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

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Abstract
As the energy industries, such as secondary batteries and fuel cells, expand rapidly, the demand for transition metals used as electrode materials is increasing, which has led to a rise in their prices. One promising strategy to address these challenges is upcycling, which involves recycling transition metal‐based waste from various industries. In this study, a heterostructure electrocatalyst for anion exchange membrane water electrolysis is developed by upcycling iron‐based waste from the automotive industry. The iron‐based swarf is converted into single‐phase Fe 2 O 3 by removing surface impurities through calcination in air. Subsequently, NiFe‐LDH is formed via sequential hydrothermal synthesis, resulting in NiFe‐LDH/Fe 2 O 3 heterostructured electrocatalysts. The hetero‐interface between NiFe‐LDH and Fe 2 O 3 significantly reduced the electrochemical activation barrier, enhancing oxygen evolution reaction (OER) activity and, furthermore, achieving high‐performance AEMWE. This approach not only reduces waste but also provides a cost‐effective alternative to traditional materials, highlighting the potential for sustainable and efficient energy solutions.
Funding Information
  • National Research Foundation of Korea

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