Molecular Catalysts Immobilized on Semiconductor Photosensitizers for Proton Reduction toward Visible‐Light‐Driven Overall Water Splitting

Abstract

a] Scheme1.Configuration of photocatalytic water splitting with (left)o ne and (right) two photosensitizing semiconductors.

Molecular and heterogeneous water oxidation catalysts: recent progress and joint perspectives

“…Concerning photoelectrochemical devices, the strong interplay of immobilized molecular cocatalysts and semiconductor substrate demands a stronger separation of their individual functions. 378 The OER process of photoelectrochemical devices is deeply entangled with charge carrier separation and transportation processes. Therefore, the role of surface-loaded molecular WOCs is expected to be evolutionary rather than stationary.…”

Research advances towards large-scale solar hydrogen production from water

“…For example, Pt and other platinum-group metals are well known for their low HER overpotential and most frequently adopted as the HER co-catalyst. 47 In recent years novel materials based on earth-abundant elements including first-row transition metal phosphides 51 , chalcogenides 52 , and biomimetic molecular catalysts 53 for this purpose have gained increasing attention. For OER, oxides of Mn, Co, Ni, Ru, and Ir are commonly used as the co-catalyst.…”

Mechanistic insights into photocatalysis and over two days of stable H2 generation in electrocatalysis by a molecular cobalt catalyst immobilized on TiO2

“…21 Amongst the most promising WRCs, one often finds cobalt-polypyridyl complexes, 22,23 which excel in reported turnover numbers (TON) as high as 80 000 H 2 WRC −1 and offer a large playground for ligand-modifications, tuning the electrochemical properties of the metal center. 24 Despite excellent properties, molecular catalysts bear some disadvantages compared to surface catalyzed systems, especially regarding long-term stability as well as applicability in a full water splitting system. The lack of separation of the two half-reactions in a homogeneous system leads to electron short-cuts, which quench the catalytic cycle.…”