Photocatalytic hydrogen production on chemically etched strontium titanate surfaces
Reaction Kinetics, Mechanisms and Catalysis, cilt.131, sa.2, ss.953-963, 2020 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 131 Sayı: 2
- Basım Tarihi: 2020
- Doi Numarası: 10.1007/s11144-020-01872-y
- Dergi Adı: Reaction Kinetics, Mechanisms and Catalysis
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Metadex, Civil Engineering Abstracts
- Sayfa Sayıları: ss.953-963
- Anahtar Kelimeler: Citric acid, Hydrogen evolution, Perovskites, SrTiO3, Water splitting, Wet chemical etching
- Boğaziçi Üniversitesi Adresli: Evet
Özet
This work aims to investigate the photocatalytic hydrogen evolution over acid (citric acid and hydrochloric acid) etched strontium titanate (SrTiO3), which is promoted by 1 wt% platinum (Pt) as co-catalyst. Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and ultraviolet–visible spectroscopy (UV–Vis) analyses of the un-etched and etched SrTiO3 are presented; the results indicate that etching affects the surface structure while it does not change the bulk properties of semiconductor. The results of the photocatalytic activity tests performed in a methanol solution using a semi-batch reaction system equipped with argon flow to collect hydrogen, 300 W xenon lamp as light source and gas chromatograph for the analysis, are also reported. The etching with 4 mol L−1 citric acid increases the hydrogen evolution rate about 20% while the highest rate of hydrogen production over etched Pt-SrTiO3 is about 550 µmol/gcat.h at the 6 h of the reaction test.