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Abstract
Molecular design represents an exciting platform to refine mechanistic details of electrocatalytic water oxidation and explore new perspectives. In the growing number of publications some general trends seem to be outlined concerning the operation mechanisms, with the help of experimental and theoretical approaches that have been broadly applied in the case of bioinorganic systems. In this review we focus on bio-inspired Cu-containing complexes that are classified according to the proposed mechanistic pathways and the related experimental evidence, strongly linked to the applied ligand architecture. In addition, we devote special attention to features of molecular compounds, which have been exploited in the efficient fabrication of catalytically active thin films.
Highlights
The current usage of energy and raw materials by humankind leads to a dead-end
1H+ /1e− proton-coupled electron transfer (PCET) by the pH-dependence of the irreversible anodic current peak. In this case the kinetic isotope effect (KIE), that is calculated in the case of electrocatalysis as KIE =2 and its value is informative about the involvement of protons in the electron transfer processes, suggested a different scenario
Confirmed a 1H+/1e PCET by the pH-dependence of the irreversible anodic current peak
Summary
The current usage of energy and raw materials by humankind leads to a dead-end. Our chances to avoid the devastating consequences seem to drop quickly. In one of the existing systems water electrolysis cells are coupled with solar cells and the latter units are connected in series to provide sufficient potential for the electrodes to carry out water splitting. Another type, the photoelectrochemical water splitting cell, is based on photoelectrodes made of semiconducting materials coated with catalysts. Water splitting and H2 combustion might create a cycle to provide clean and sustainable energy In this cycle, the hydrogen and oxygen evolving reactions (HER and OER, respectively, corresponding to the redox half-cell reactions of water electrolysis) affect the efficiency of the overall energy conversion and their broader application at larger scales requires components that are abundant
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