Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.138
Publication date: 16th December 2024
In recent years, metal−organic frameworks (MOFs) have been extensively investigated for diverse heterogeneous catalysis due to their diversity of structures and outstanding physical and chemical properties.[1] Currently, most related work focuses on employing MOFs as porous substrate materials to fabricate confined nanoparticle or heteroatom doped electrocatalysts.[2] However, they must typically be annealed at high temperature before application.
Herein, a simple room-temperature process is used to synthesize a series of bi-, tri-, tetra- or penta-metallic MOFs directly on a nickel or steel substrate. The as-prepared MOFs are applied directly as highly efficient oxygen evolution reaction (OER) electrocatalysts with no post-annealing treatment. Highest OER activity was found for the tetra-metallic Ni2Co2MnZnFex-BTC MOF outperforming those of single metal MOFs and commercial precious RuO2 catalysts significantly. With this MOF as the catalyst, OER current densities of 10 and 100 mA cm-2 can be achieved with overpotentials of only 222 and 250 mV, respectively. Meanwhile, a small Tafel slope of 30 mV dec-1 was obtained.
It was found important that some iron ions from the steel substrate are incorporated in the MOF structure due to local partial corrosion; if a nickel substrate is used some few iron ions must be added to obtain electrocatalytic activity. The presence of BTC linkers is important as well; without them no active material is deposited on the substrates.
Moreover, the catalysts show high electrochemical stability in strong basic solution as used in alkaline electrolysis. This work demonstrates that bi- and multi-metallic MOFs prepared by easy and energy-efficient deposition procedures are promising as advanced catalysts for electrochemical energy conversion.
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