In-situ Cl− ions formation during photocatalytic reaction of platinized nanocomposite for hydrogen generation

• Published in: Solar energy Vol. 174; pp. 1019 - 1025
• Main Authors: Chilkalwar, Anushree A., Mangrulkar, Priti A., Moinuddin, Afsha Anjum, Penumaka, Nagababu, Rayalu, Sadhana S.
• Format: Journal Article
• Language: English
• Published: New York Elsevier Ltd 01.11.2018; Pergamon Press Inc
• Subjects: Catalysis; Catalysts; Charge transfer; Chloride ions; Conduction; Conduction bands; H2 generation; Hydrogen; Hydrogen evolution; Hydrogen production; Hydrogenation; Illumination; In-situ Cl− ions; Light; Nanocomposites; Nanoparticles; Organic chemistry; Photocatalysis; Photocatalytic; Recombination; Scavenging; Solar energy; Surface stability; Titanium dioxide; Transmission electron microscopy; Ultraviolet radiation; Nanoparticles; Photocatalytic; H2 generation; In-situ Cl− ions
• ISSN: 0038-092X; 1471-1257
• DOI: 10.1016/j.solener.2018.09.047

Plausible reaction mechanism for photoreduction by Pt/TiO2 nanocomposite in presence of H2PtCl6 and ethanol as a sacrificial donor. Treatment of PtCl6 with aqueous medium gives the [Pt(OH)6]2− ions, the steps are as follows in path 1 at valance band as shown in above scheme. [Display omitted] •It mainly deals with Pt/TiO2 composite provied to be a photocatalytic H2 generation.•It is a promising catalyst with chemical stability, large surface area.•We explored the influence of Cl− formed during in situ photocatalytic process.•Photocatalytic hydrogen generation by scavenging holes.•In-situ photodeposition leads incredibly active photocatalyst for H2 generation.•It is one of the highest reported (6.72%).•The hydrogen evolution rate of 17 mmol h−1 with apparent quantum yield (AQE). Platinised Titania is emerging as a promising catalyst for its chemical stability, large surface area, and good electronic charge transfer. It is one of the most efficient materials and has been studied over past few decades for photocatalytic hydrogen generation. Photodeposition of Pt nanoparticles on TiO2 surface enhances trapping of photoexcited electrons and restricts recombination process. In this article we explored the influence of chloride ion formed during in-situ photocatalytic process, on photocatalytic hydrogen generation by scavenging holes. Illumination under UV–Visible light (400 nm < λ < 700 nm) improves interband excitation and transfer of photogenerated electron to the conduction band of TiO2. Transmission electron microscopy (TEM) results reveal average particle size of Pt nanoparticle in the range of 10 nm with uniform distribution on TiO2 surface. In-situ photodeposition of Pt nanoparticle on TiO2 resulted in incredibly active photocatalyst for hydrogen generation due to in-situ generated Cl− ions. Also, to one of the highest reported (6.72%). The hydrogen evolution rate of 17 mmol h−1 with apparent quantum yield (AQE). The AQE significantly higher than that for catalyst under solar AM (1.5 G) illumination (0.04%).