Solar H₂ evolution in water with modified diketopyrrolopyrrole dyes immobilised on molecular Co and Ni catalyst–TiO₂ hybrids

Abstract

A series of diketopyrrolopyrrole (DPP) dyes with a terminal phosphonic acid group for attachment to metal oxide surfaces were synthesised and the effect of side chain modification on their properties investigated.

Edge‐Enriched Ultrathin MoS2 Embedded Yolk‐Shell TiO2 with Boosted Charge Transfer for Superior Photocatalytic H2 Evolution

“…A possible photocatalytic mechanism of the as‐formed hybrids is illustrated in Scheme for clarifying the H 2 evolution. It is reasonable to assume that the electrons are transferred more easily from the excited TiO 2 to MoS 2 through the stronger chemical bond existing in UMT‐0.14 and then the reduced proton to produce H 2 , due to the comparable energy difference between the conduction band (CB) of TiO 2 (E CB (TiO 2 ) = −0.70 V vs NHE, pH 7) and MoS 2 (E CB (MoS 2 ) = −0.13 V vs NHE, pH 7) . Compared with bulk MoS 2 , ultrathin MoS 2 flakes can serve as the electron acceptor and the channel for accelerating the electron transfer with an enhanced hydrogen evolution rate in the presence of an increased number of active sites and enriched edges (Scheme a).…”

Interfacing Formate Dehydrogenase with Metal Oxides for the Reversible Electrocatalysis and Solar‐Driven Reduction of Carbon Dioxide

“…Both dyes are known to adsorb onto TiO 2 via their phosphonate-anchoring groups and DPP provides aprecious-metal-free alternative to RuP. [25] CO 2 was introduced to the solution via the addition of NaHCO 3 .Upon UV-filtered irradiation, the photoexcited dye injects electrons into the conduction band (CB) of TiO 2 (E CB (TiO 2 ) = À0.67 Vv s. SHE at pH 6.5), [25] whereupon the electrons are conveyed to the catalytic W-center of FDH to drive CO 2 reduction. Theo xidized dye is regenerated by the sacrificial electron donor (Figure 1).…”

Organometallic Iridium(III) Complex Sensitized Ternary Hybrid Photocatalyst for CO2 to CO Conversion

“…[14] The dye-sensitized photocatalysis (DSP) approachi nvolves an n-type TiO 2 semiconductor as an electron mediator anda sa scaffold that ideally links the molecular or metal components by coadsorption onto the TiO 2 surface. [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] The DSP system rapidly consumes the reactive excited (IrPS*) or reduced (IrPSC À )s pecies with the alleviation of intermoleculari nteraction by low average coverage of the PS, consequently lessening the photodegradation of IrPS. Such coassembly of components onto as emiconductor surfacec an also allow no limitation of solvent selection based on heterogenization, with easy preparation and tunability of the DSP system.…”