Highly efficient hydrogen production under visible light over g-C3N4-based photocatalysts with low platinum content

Sulfuric Acid Solutions of [Pt(OH)4(H2O)2]: A Platinum Speciation Survey and Hydrated Pt(IV) Oxide Formation for Practical Use

“…The only higher efficiency of platinum utilization in Pt/C 3 N 4 photocatalytic systems [8.5 mol·h –1 ·g­(Pt) −1 ] was demonstrated recently by our group for the catalysts prepared via the deposition of PtO x species onto the g-C 3 N 4 surface by dimeric Pt­(IV) nitrato complex chemisorption . In contrast to the chemisorption approach, the utilization of HHPA and sulfuric acid solutions for catalyst preparation described here is simpler and, to a large extent, a “greener” approach because it does not require the isolation of complex salts and the use of organic solvents during the deposition procedure.…”

“…The only higher efficiency of platinum utilization in Pt/C 3 N 4 photocatalytic systems [8.5 mol•h −1 •g(Pt) −1 ] was demonstrated recently by our group for the catalysts prepared via the deposition of PtO x species onto the g-C 3 N 4 surface by dimeric Pt(IV) nitrato complex chemisorption. 80 In contrast to the chemisorption approach, the utilization of HHPA and sulfuric acid solutions for catalyst preparation described here is simpler and, to a large extent, a "greener" approach because it does not require the isolation of complex salts and the use of organic solvents during the deposition procedure. Balancing between higher QE and better platinum utilization, the highly efficient photocatalysts can be constructed on the basis of the proposed synthetic methodology aimed at full H 2 O photodecomposition (H 2 + O 2 generation), 81,82 water purification, 83 or related applications.…”

Highly Active Visible Light-Promoted Ir/g-C3N4 Photocatalysts for the Water Oxidation Reaction Prepared from a Halogen-Free Iridium Precursor

“…According to the equation, 2O 2– → O 2 + 4e – , if we multiply AQE by a factor of 4 (which corresponds to four involved electrons) one can calculate that for the Ir 0.25 / g- C 3 N 4 _air catalyst 71% quantum efficiency per electron transferred is achieved. This is significantly higher than the result obtained by us for the photocatalytic H 2 generation using the same g-C 3 N 4 material with the Pt cocatalyst (10% AQE per electron transferred is attained with TEOA sacrificial reagent) . In this regard, the prepared Ir/ g- C 3 N 4 catalysts have clear potential in the construction of tandem catalytic systems for the overall water splitting process.…”

“…A pristine graphitic carbon nitride material with a high surface area (200 m 2 /g) was obtained by the thermal decomposition of a melamine-cyanurate complex as described previously . For the deposition of iridium, the freshly prepared Ir_ANC_HNO 3 solutions (120 °C, 1 h) were used predominantly containing fac- [Ir­(H 2 O) 3 (NO 2 ) 3 ] complex as shown above.…”

“…The graphitic g-C 3 N 4 material was obtained by the thermolysis of a melamine-cyanuric acid (MCA) supramolecular associate by a protocol described in detail previously. 33 Materials Preparation. (NH 4 ) 3 [Ir(NO 2 ) 6 ].…”