Fotoelektrokimyasal Yolla Hidrojen Gazı Üretiminde Kullanılan BiVO4/Cr2O3 Fotoelektrodunun RuO2 İle Katalitik Etkinliğinin Artırılması

Öz

Bu çalışmada, suyun ayrıştırılmasında fotokatalitik özelliğe sahip BiVO4/Cr2O3 n-p ikili fotoelektrodun üzerine oksijen oluşum reaksiyonunda (OER) katalitik özellik gösteren RuO2, dönüşümlü voltametri (DV) tekniği kullanılarak farklı döngülerde (2, 5, 7 ve 10) katkılanmıştır. Farklı döngülerde sentezlenen BiVO4/Cr2O3/RuO2 elektrotlarının karakterizasyonu taramalı elektron mikroskobu (SEM), X-ışını kırınımı (XRD) ve UV-vis spektrometresiyle gerçekleştirilmiştir. Suyun fotoelektrokimyasal ayrıştırılmasıyla hidrojen gazı üretiminde fotokatalitik performanslar doğrusal tarama voltametrisi (LSV), elektrokimyasal impedans spektroskopisi (EIS) ve kronoamperometrik ölçümlerle gerçekleştirilmiştir. EIS ölçümü, BiVO4/Cr2O3 (413,1  cm2) üzerine katkılanan RuO2 ile polarizasyon direncinin azaldığını ve BiVO4/Cr2O3/RuO2 elektrotları arasında en düşük polarizasyon direncinin 7 döngü sonunda elde edilen elektrotta ait olduğunu Rp (102,8 ohm cm2) göstermektedir. LSV ve kronoamperometrik ölçümleri, RuO2 sentezindeki DV döngüsünün artmasıyla fotoelektrodun OER katalitik aktivitesinin artığını ancak 10 döngüde BiVO4/Cr2O3 n-p ikili elektrodun katalitik performansın azaldığını göstermektedir.

Anahtar Kelimeler

• Hidrojen gazı üretimi
• yarı iletken
• fotoelektrot
• heteroyapılı elektrot
• fotoelektrokimyasal su ayrıştırma

Destekleyen Kurum

Tübitak

Proje Numarası

2218-Yurt İçi Doktora Sonrası Araştırma Burs Programı,

Teşekkür

Bu çalışmanın yapılmasında destek veren TÜBİTAK 2218-Yurt İçi Doktora Sonrası Araştırma Burs Programı’ na, Mersin Üniversitesi Fen-Edebiyat Fakültesi Kimya Bölümü’ ne, Çukurova Üniversitesi Fen-Edebiyat Fakültesi Kimya Bölümü Fizikokimya Araştırma Lab.’ına, XRD analiz ve SEM görüntüleri için Merkez Lab.’a, deneysel çalışmalarda değerli katkıları için Prof. Dr. Gülfeza KARDAŞ’a teşekkür ederim.

Increasing The Catalytic Efficiency with RuO2 of BiVO4/Cr2O3 Photoelectrode Used in The Photoelectrochemical Production of Hydrogen Gas

Öz

In this study, RuO2, which shows catalytic property in oxygen formation reaction (OER) on BiVO4/Cr2O3 n-p binary photoelectrode which has photocatalytic property in water separation, was doped in different cycles (2, 5, 7 and 10) by using cycling voltammetry (CV) technique. The characterization of BiVO4/Cr2O3/RuO2 electrodes synthesized in different cycles was performed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-vis spectrometry. Photocatalytic performances in hydrogen gas production by photoelectrochemical water splitting were conducted by linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and chronoamperometric measurements. The EIS measurement shows that the polarization resistance is reduced by RuO2 doped on BiVO4/Cr2O3 (413,1 ohmcm2) and that the lowest polarization resistance among the BiVO4/Cr2O3/RuO2 electrodes belongs to the electrode obtained at the end of 7 cycles. LSV and chronoamperometric measurements show that the OER catalytic activity of the photoelectrode increases with the increase of the clycles CV in the RuO2 synthesis, but the catalytic performance of the BiVO4/Cr2O3 n-p binary electrode decreases at the 10 cycles.

Anahtar Kelimeler

• Hydrogen gas production
• Seniconductor
• Photoelectrode
• Heterostructure
• Photoelectrocemical water spliting

Proje Numarası

2218-Yurt İçi Doktora Sonrası Araştırma Burs Programı,

Kaynakça

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