Metal-organic framework-based self-supported electrodes for oxygen evolution reaction

Abstract

Oxygen evolution reactions (OER), commonly employed in applications such as metal-air batteries, water electrolysis, fuel cells, etc., often suffer from slow kinetics, thus leading to ultra-high potentials that severely affect device energy efficiency. Metal-organic frameworks (MOFs) have garnered massive attention as electrodes for OER, benefiting from their highly ordered porous frameworks, abundant accessible active metal sites, and adjustable lattice structures. However, using powdered MOFs in OER poses a challenge, limiting the exposure of numerous active sites and resulting in suboptimal efficiency. To address this limitation, the trend towards designing MOF-based self-supported electrodes with enhanced contact between MOFs and the current collector has gained considerable attention for OER applications. This review highlights recent advancements and future prospects in developing MOF-based self-supported electrodes for OER. We delve into various aspects, including preparation methods, optimization strategies, catalytic efficiencies, and OER mechanisms with MOF-based electrocatalysts. Furthermore, we explore the existing challenges associated with MOF-based self-supported electrodes for OER. This comprehensive overview provides valuable insights into the evolving landscape of MOF-based materials in advancing OER.

Keywords

Metal-organic frameworks (MOFs) / electrocatalyst / self-supported electrodes / catalytic mechanism / oxygen evolution reaction (OER)

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