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Diamondoid Ni(II) Coordination Polymer as an Electrocatalyst for Hydrogen and Oxygen Evolution Reactions and Overall Water Splitting.

Sanobar NaazTaposi ChatterjeeSaswati RoyBasudeb DuttaSaikh Mohammad WabaidurMasoom Raza SiddiquiMalik WahidSeikh Mafiz AlamMohammad Hedayetullah Mir
Published in: Chemistry, an Asian journal (2024)
We have successfully synthesized a new Ni(II)-based coordination polymer (CP) [Ni 2 (cis-1,4-chdc) 2 (4,4'-bpy) 3 (H 2 O) 2 ] (1); (cis-1,4- H 2 chdc=cis-1,4-cyclohexanedicarboxylic acid and 4,4'-bpy=4,4'-bipyridine) employing slow diffusion method in a single pot technique. The connectivity of Ni(II) ions and bridging cis-1,4-chdc ligand gives rise to a three-dimensional (3D) framework with 2-fold interpenetrated diamondoid topology. Interestingly, the synthesized CP acts as efficient catalyst for electrocatalytic water splitting. The water oxidation activity of compound 1 exhibits Tafel slope equivalent to 361.48 mV.dec -1 for hydrogen evolution reaction (HER) and 353.53 mV.dec -1 for oxygen evolution reaction (OER) in an alkaline medium while almost similar values of Tafel slope for HER and OER equivalent to 287.33 mV.dec -1 and 289.93 mV.dec -1 respectively in acidic medium. Thus, the compound 1 has excellent efficacy in catalyzing HER and OER in acidic as well as alkaline medium, which is ascribed to its distinctive 3D architecture.
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