Aerogel-Derived Nickel-Iron Oxide Catalysts for Oxygen Evolution Reaction in Alkaline Media: Article No. 123843

Luigi Osmieri, Haoran Yu, Raphael Hermann, Melissa Kreider, Harry Meyer III, A. Jeremy Kropf, Jae Hyung Park, Shaun Alia, David Cullen, Deborah Myers, Piotr Zelenay

Research output: Contribution to journalArticlepeer-review

Abstract

Anion exchange membrane water electrolyzers (AEMWEs) can generate hydrogen with a pure water feed using noble metal-free catalysts. The development of highly active and stable catalysts for oxygen evolution reaction (OER) is required for improving performance of AEMWEs systems. Ni-Fe (oxy)hydroxides show high OER catalytic activity in alkaline media, but typically have low surface area. In this work, we investigate a series of Ni-Fe oxides with high surface area and disordered morphology, obtained using an aerogel synthesis method. We evaluate the impact of different synthesis variables on the OER activity and demonstrate that heat treatment at high temperatures generates more ordered structure, resulting in a decrease in OER activity. Advanced characterization reveals that maintaining highly disordered and porous structure of the aerogel is essential to achieving high OER activity, as it enables the formation of highly OER-active lamellar structures of the catalyst.
Original languageAmerican English
Number of pages19
JournalApplied Catalysis B: Environmental
Volume348
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5900-89213

Keywords

  • aerogel
  • anion exchange membrane
  • nickel-iron (oxy)hydroxide
  • oxygen evolution reaction
  • water electrolysis

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