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Published on: December 6, 2021
One-dimensional nickel(II) coordination polymers of 9-anthracenyl-4'-benzoate and bispyridyl linkers as efficient
K Mohamed Yusuf Baig1, Sundaramoorthy Marimuthu1, Govindhan Maduraiveeran1,2,3
1Department of Chemistry, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India. maduraig@srmist.edu.in.
Abstract:
Developing stable, efficient, and affordable Earth-abundant transition metal-based electrocatalysts for water splitting applications is key to producing green hydrogen. This study reports the development of new Ni(II)-based one-dimensional coordination polymers (CPs), namely, [Ni(9-AnBz)2(4,4'-bpy)2(MeOH)2] (CP 1), [Ni(9-AnBz)2(4,4'-bpe)2(MeOH)2] (CP 2), and [Ni(9-AnBz)2(3,3'-bpdb)2(H2O)2]·H2O (CP 3) (where 9-AnBz = 9-anthracenyl-4'-benzoate, 4,4'-bpy = 4,4'-bipyridine, 4,4'-bpe = trans-1,2-bis(4'-pyridyl)ethene, and 3,3'-bpdb = 1,4-bis(3'-pyridyl)-2,3-diaza-1,3-butadiene), as novel electrocatalysts. Their structures have been confirmed by single crystal X-ray diffraction. These Ni(II)-based CPs exhibited improved electrocatalytic activity towards both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) in 1.0 M KOH. The CP 1 catalyst was found to deliver a low HER onset potential (∼-0.04 V vs. RHE), a small HER overpotential (∼87 mV at -10 mA cm-2), a Tafel slope of ∼107.0 mV dec-1, high current density (-496 mA cm-2 at ∼1.83 V vs. RHE), and high mass activity (∼50.0 A g-1), comparable to those of commercial Pt/C. Moreover, the CP 1 catalyst also exhibited the best OER activity, with a small overpotential (∼370 mV at 10 mA cm-2) and a low Tafel slope (∼82 mV dec-1), showing efficient performance and great promise in hydrogen production systems.
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