Influence of graphene sheet properties as supports of iridium-based N-heterocyclic carbene hybrid materials for water oxidation electrocatalysis

Abstract

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Noncovalent Immobilization of Pentamethylcyclopentadienyl Iridium Complexes on Ordered Mesoporous Carbon for Electrocatalytic Water Oxidation

“…However, due to more efficient immobilization of Ir-2 on OMC as discussed earlier, Ir-2 allows the incorporation of more catalyst sites on the OMC surface and thus displays the highest OER current density among three catalysts. These TOF values are comparable with other supported Ir catalysts, and more importantly, ours operate at lower overpotentials and pH (Table 2), [35][36][37][38]41] which is desirable for the improved device energy efficiency.…”

“…Schematic of supported iridium molecular complexes for water oxidation. a) the study by deKrafft et al[35] ; b) the study by Nieto et al and Sánchez-Page et al[36,37] ; c) the study by Joya et al[38] ; d) the study by Sheehan et al[41] ; e) this work.www.advancedsciencenews.com www.small-science-journal.com Small Sci. 2021, 1, 2100037…”

“…[35] The attachment of iridium complexes to carbon nanotubes using water soluble N-heterocyclic carbene ligands via ester linkage attachment for chemical oxidation in acidic conditions and electrochemical oxidation at neutral pH has been reported (Scheme 2b). [36,37] Cp*Ir complexes Scheme 1. Structures of molecular iridium complexes previously studied as catalyst precursors for electrochemical water oxidation.…”

Carbon-Based Materials for the Development of Highly Dispersed Metal Catalysts: Towards Highly Performant Catalysts for Fine Chemical Synthesis

“…In Ren et al (2020), a novel terpyridine-based hetero-bimetallic Ni/Pd nanosheet supported on graphene oxide was synthesized, exhibiting higher catalytic activity, substrate applicability and recyclability for the Suzuki coupling reaction under mild conditions [43]. On the electrocatalysis field, Sánchez-Page et al (2020), have determined the influence of graphene sheet properties as supports of iridium-based N-heterocyclic carbene hybrid materials on water oxidation [44].…”

Graphene-Based Materials Immobilized within Chitosan: Applications as Adsorbents for the Removal of Aquatic Pollutants

“…Nevertheless, for regeneration and reuse, the collection of GO-based materials from water is an issue, and new simple and efficient removal methods are needed before graphene or GO can be employed in practical applications of water treatment [19]. Moreover, there are strong π-π interactions between GO sheets which result in aggregation, lowering of the surface area, poor dispersion in aqueous media and reduced adsorption efficiency, thus limiting its further use in wastewater treatment [20]. Therefore, new strategies aimed at minimizing aggregation, leaching and recovery of the graphene and/or GO sheets are required, and their functionalization and combination with, or immobilization within, other materials may provide possible solutions.…”