Photoelectrocatalytic Synthesis of Hydrogen Peroxide by Molecular Copper‐Porphyrin Supported on Titanium Dioxide Nanotubes. Issue 8 (20th February 2018)

• Record Type: Journal Article
• Authors: Apaydin, Dogukan H.; Seelajaroen, Hathaichanok; Pengsakul, Orathip; Thamyongkit, Patchanita; Sariciftci, Niyazi Serdar; Kunze‐Liebhäuser, Julia; Portenkirchner, Engelbert
• Is Part Of: ChemCatChem. Volume 10:Issue 8(2018)
• Page Start: 1793
• Page End: 1797
• Publication Date: 2018-02-20
• Subjects: copper -- heterogeneous catalysis -- hydrogen peroxide -- oxygen reduction -- photoelectrochemistry; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201702055
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: We report on a self‐assembled system comprising a molecular copper‐porphyrin photoelectrocatalyst, 5‐(4‐carboxy‐phenyl)‐10, 15, 20‐triphenylporphyrinatocopper(II) (CuTPP‐COOH), covalently bound to self‐organized, anodic titania nanotube arrays (TiO2 NTs) for photoelectrochemical reduction of oxygen. Visible light irradiation of the porphyrin‐covered TiO2 NTs under cathodic polarization up to −0.3 V vs. Normal hydrogen electrode (NHE) photocatalytically produces H2 O2 in pH neutral electrolyte, at room temperature and without need of sacrificial electron donors. The formation of H2 O2 upon irradiation is proven and quantified by direct colorimetric detection using 4‐nitrophenyl boronic acid ( p ‐NPBA) as a reactant. This simple approach for the attachment of a small molecular catalyst to TiO2 NTs may ultimately allow for the preparation of a low‐cost H2 O2 evolving cathode for efficient photoelectrochemical energy storage under ambient conditions. Abstract : No sacrificing electron donors : A novel photocathode (TiO2 NTs/CuTPP‐COOH) has been demonstrated to be capable of reducing dissolved O2 to H2 O2 with evolution rates ranging between 2 and 13 μgH2O2 mgcat ‐1 h ‐1 .