Nickel (II) and Cobalt (II) Based 2D mixed metal-metal organic frameworks (MM-MOFs) for electrocatalytic water splitting reactions

Hydrogen and oxygen production from electrocatalytic water splitting offers a sustainable strategy towards achieving renewable energy. However, sluggish kinetics of the reaction require expensive platinum (Pt) and ruthenium dioxide (RuO₂)/ iridium dioxide (IrO₂)-based electrocatalysts where the high cost of the catalyst hinders the practical use of water splitting reaction. Two-dimensional mixed metal metal-organic frameworks (2D MM-MOFs) have emerged as alternative promising electrocatalysts. In MM-MOFs, the metal centers play a crucial role in determining the catalytic activity. Among several MM-MOFs explored for water splitting reaction, Co(II) and Ni(II)-based MM-MOFs have shown a significant potential, rendering them as promising materials for efficient and sustainable electrochemical energy conversion and storage technologies. Herein, we highlight recent advancements in the development of Ni(II) and Co(II)-based 2D MM-MOFs, emphasizing their outstanding electrocatalytic performance for hydrogen evolution reaction and oxygen evolution reaction. Strategies for the effective design and development of electrocatalysts along with the challenges are also discussed.