Photocatalytic Hydrogen Production from Water Catalyzed by Eosin-Y Sensitized Ba2P2O7

Öz

In this study, the barium pyrophosphate (Ba2P2O7) catalyst was sensitized with Eosin-Y (EY) dye, and its photocatalytic hydrogen production activity was investigated from water. Here, the Ba2P2O7 catalyst showed 2.23 mmol g-1 hydrogen production in the presence of triethanolamine (TEOA) electron donor and under visible light. However, when chloroplatinic acid (H2PtCl6) was added into the medium to increase the hydrogen production activity of the system, Pt, as a co-catalyst, was through photodeposition on the catalyst surface, and 18.47 mmol g-1 hydrogen activity was reached in 8 hours. These results show that efficient electron transfer is achieved between excited EY molecules and Ba2P2O7. The adsorption of EY on the Ba2P2O7 catalyst promotes hydrogen activity by creating more photoexcited electrons in response to visible light. Additionally, Pt co-catalyst supports hydrogen production by increasing the photoexcited charge separation efficiency

Anahtar Kelimeler

• Photocatalysis
• hydrogen evolution
• Ba2P2O7
• Eosin-Y

Eosin-Y ile Hassaslaştırılmış Ba2P2O7 Katalizörlüğünde Sudan Fotokatalitik Hidrojen Üretimi

Öz

Bu çalışmada, Baryum pirofosfat (Ba2P2O7) katalizörü Eosin-Y (EY) boyar maddesi ile hassaslaştırılarak sudan fotokatalitik hidrojen üretimindeki aktivitesi incelenmiştir. Burada Ba2P2O7 katalizörü, trietanolamin (TEOA) elektron vericisi varlığında ve görünür bölge ışığı altında 2.23 mmol g-1 hidrojen üretimi göstermiştir. Bununla birlikte sistemin hidrojen üretim aktivitesini arttırmak için ortama kloroplatinik asit (H2PtCl6) ilave edildiğinde reaksiyon ortamında katalizör yüzeyinde fotodepozisyon yoluyla Pt yardımcı katalizörü oluşarak 8 saatte 18.47 mmol g-1 hidrojen üretim aktivitesine ulaşılmıştır. Bu sonuçlar, uyarılmış EY molekülleri ile Ba2P2O7 arasında verimli elektron transferinin sağlandığını göstermektedir. EY'nin Ba2P2O7 katalizörü üzerindeki adsorpsiyonu ile görünür bölge ışığı karşısında daha fazla fotouyarılmış elektronlar oluşturarak hidrojen aktivitesini teşvik etmektedir. Ayrıca Pt yardımcı katalizörü, fotouyarılmış yük ayrım verimini arttırarak hidrojen üretimini desteklemektedir.

Anahtar Kelimeler

• Fotokataliz
• hidrojen üretimi
• Ba2P2O7
• Eosin-Y

Kaynakça

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