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We propose a new class of H2 evolution photocatalyst containing TMD not as a co-catalyst, but as a photosensitizer: MoSe2/C60-dendron nanohybrids, assisted by 1-benzyl-1,4-dihydronicotinamide (BNAH) as a sacrificial donor and Pt nanoparticles as co-catalysts. The 2D/0D mixed-dimensional heterojunction formed by MoSe2 and C60 is highly effective in generating mobile carriers under visible and NIR light irradiation.  This process involves electron extraction from the exciton in MoSe2 to C60, followed by electron transfer to Pt nanoparticles via MV2+, leading to H2 production from water.  Even NIR light, such as 800 nm light corresponding to the A-exciton absorption of MoSe2, can facilitate water splitting.  The EQY of the H2 evolution reaction was estimated to be 0.0027%., (© 2024 Wiley‐VCH GmbH.)

Titanium dioxide doped with Pt(IV) ions was synthesized via a sol-gel method, incorporating a sol purification process through dialysis. The doped Pt(IV) ions were reduced by UV light irradiation to obtain a transparent Pt-TiO 2 sol, with Pt(0) acting as a cocatalyst for hydrogen evolution. The hydrogen evolution activity of Pt-TiO 2 sol was evaluated under UV light irradiation using methanol as a sacrificial reagent. 0.05 atom % Pt-TiO 2 sol remained in the sol state without precipitation after 10 h of UV light irradiation. The amount of hydrogen produced after 10 h of light irradiation was 1195 μmol, with a turnover number (TON) of 664.1, a turnover frequency (TOF) of 66.4 h -1 , and an apparent quantum yield (AQY) of 0.86%. The sol-gel synthesis from the molecular level is thought to result in Pt ions being doped inside the TiO 2 particles, maintaining high dispersibility by suppressing particle growth due to the aggregation of Pt(0) during the UV reduction of Pt(IV) ions. These results show that the Pt-TiO 2 photocatalyst has a high renewable energy factor because it can be synthesized at room temperature, and the aggregation of Pt-TiO 2 particles is suppressed by making full use of a sol-gel method., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)