A Novel Photocatalytic System Constructed Using Eosin Y, Titanium Dioxide, and Keggin-Type Platinum(II)- and Aluminum(III)-Coordinated Polyoxotungstates for Hydrogen Production from Water Under Visible Light Irradiation

Abstract

A novel photocatalytic system constructed using Eosin Y, a-Keggin-type diplatinum(II)-coordinated tungstophosphate Cs 3 [a-PW 11 O 39 {cis-Pt(NH 3 ) 2 } 2 ]Á8H 2 O (Cs-Pt-1), a-Keggin-type mono-aluminum(III)-coordinated tungstosilicate K 5 [a-SiW 11 {Al(OH 2 )}O 39 ]Á7H 2 O (KAl-1), and titanium dioxide achieved a steady rate of hydrogen evolution with highly effective utilization of platinum sites from aqueous triethanolamine solution during a long-term visible light irradiation. Graphical Abstract Eosin Y TiO 2 Visible light Aqueous TEOA solution H 2 Cs-Pt 1 K-Al-1

Thermal Treatment of a Keggin‐Type Diplatinum(II)‐Coordinated Polyoxotungstate: Formation of Hydrophilic Colloidal Particles and Photocatalytic Hydrogen Production

“…TEOA was used as the sacrificial reagent. [ 13,49 ] Cs‐Si‐Pt‐300–5 , EY, and K‐Si‐Al were used as co‐catalyst, photosensitizer, and EY stabilizer, respectively. [ 13,49 ] TiO 2 was used to promote charge separation.…”

“…[ 13,49 ] Cs‐Si‐Pt‐300–5 , EY, and K‐Si‐Al were used as co‐catalyst, photosensitizer, and EY stabilizer, respectively. [ 13,49 ] TiO 2 was used to promote charge separation. [ 50 ] Hydrogen was formed with 100 % selectivity, and oxygen, carbon dioxide,carbon monoxide, and methane were not detected under these reaction conditions.…”

“…In the last few years, we have also synthesized cesium and tetramethylammonium salts of α‐Keggin diplatinum(II)‐coordinated phospho‐, silico‐, and germanotungstates, including Cs 3 [α‐PW 11 O 39 { cis ‐Pt(NH 3 ) 2 } 2 ] · 8H 2 O, [(CH 3 ) 4 N] 3 [α‐PW 11 O 39 { cis ‐Pt(NH 3 ) 2 } 2 ] · 10H 2 O, [(CH 3 ) 4 N] 4 [α‐SiW 11 O 39 { cis ‐Pt(NH 3 ) 2 } 2 ] · 13H 2 O, and [(CH 3 ) 4 N] 4 [α‐GeW 11 O 39 { cis ‐Pt(NH 3 ) 2 } 2 ] · 11H 2 O using a similar approach, and demonstrated long‐term steady hydrogen production with highly effective utilization of the platinum centers for hydrogen production from aqueous ethylenediamine tetraacetic acid disodium salt (EDTA · 2Na) and triethanolamine (TEOA) solutions under visible light irradiation. [ 11–15 ]…”

Study on deactivation and reaction mechanism of Co thiolate complexes in photocatalytic hydrogen production system

“…The electron donor in the electronic system provides electrons to photosensitizer to continue to participate in the proton reduction. 6 Moreover, some photocatalytic hydrogen production systems have successfully developed hydrogen production, while most of them have used noble metals as photocatalyst, such as platinum, 17 rhodium, 18 ruthenium, 19 and palladium. 20 Zhu et al 21 had prepared the anthryl-porphyrin functionalized platinum nanoparticle to be used as photocatalyst in the photocatalytic hydrogen production system and then explored the energy donor of anthracene substitutes and the energy acceptor of porphyrin, and it concluded that the complex nanoparticle could efficiently catalyze hydrogen generation in the photocatalytic hydrogen production system, and the total amount of hydrogen production was 175.3 μmol under UV-vis light irradiation for 12 hours.…”

Hydrogen Evolution from Water under Visible-Light Irradiation Using Keggin-Type Platinum(II)-Coordinated Phospho-, Silico-, and Germanotungstates as Co-Catalysts

“…This system achieved a steady hydrogen production during 12 h of light irradiation with highly effective utilization of the platinum sites for hydrogen production from aqueous triethanolamine (TEA) solutions under visible light irradiation (λ ≥ 400 nm, ≥440 nm, and ≥500 nm) [7]. During the light irradiation, we observed the formation of a reduced species (heteropoly blue species; HPB) of Cs-P-Pt, which was the key to achieving a steady hydrogen evolution during a 12 h of light irradiation.…”