Boosting oxygen evolution reaction by FeNi hydroxide-organic framework electrocatalyst toward alkaline water...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The oxygen evolution reaction (OER) is critical for energy conversion and storage technologies.
• Developing cost-efficient and durable OER catalysts with industrial relevance remains a significant challenge.

Purpose of the Study:

• To report an efficient and durable FeNi hydroxide organic framework nanosheet array catalyst for the oxygen evolution reaction.
• To investigate the catalyst's performance at industrial-grade current densities in alkaline media.

Main Methods:

• Fabrication of a two-dimensional nanosheet porous array catalyst based on FeNi hydroxide organic framework.
• In situ derivation of FeNi hydroxide active sites.
• Electrochemical characterization of the catalyst's performance in alkaline electrolyte.

Main Results:

• The catalyst exhibits excellent long-term OER performance at industrial-grade current densities.
• Achieved an overpotential of 280 mV to deliver a current density of 1 A/cm².
• Demonstrated durability exceeding 1000 hours.
• An alkaline water electrolyzer using this catalyst showed increased economic effectiveness.

Conclusions:

• The FeNi hydroxide nanosheet array catalyst offers high activity and durability for the oxygen evolution reaction.
• The catalyst's performance is attributed to its unique nanostructure, synergistic bimetallic active sites, and stabilizing carboxyl ligands.
• This development presents a promising, cost-effective alternative for industrial applications in energy conversion and storage.