Nanocomposite of TiO2 @ Ni- or Co-doped Graphene Oxide for Efficient Photocatalytic Water Splitting
Almutairi, M., Ebraheim, E., Mahmoud, M., Atrees, M., Ali, M., Khawassek, Y. (2019). Nanocomposite of TiO2 @ Ni- or Co-doped Graphene Oxide for Efficient Photocatalytic Water Splitting. EKB Journal Management System, 62(9), 1649-1658. doi: 10.21608/ejchem.2019.9722.1648
Mohammad M. Almutairi; Ebraheim E. Ebraheim; Mohamed S. Mahmoud; Mohamed S. Atrees; Mohamed E. M. Ali; Yasser Mahmoud Khawassek. "Nanocomposite of TiO2 @ Ni- or Co-doped Graphene Oxide for Efficient Photocatalytic Water Splitting". EKB Journal Management System, 62, 9, 2019, 1649-1658. doi: 10.21608/ejchem.2019.9722.1648
Almutairi, M., Ebraheim, E., Mahmoud, M., Atrees, M., Ali, M., Khawassek, Y. (2019). 'Nanocomposite of TiO2 @ Ni- or Co-doped Graphene Oxide for Efficient Photocatalytic Water Splitting', EKB Journal Management System, 62(9), pp. 1649-1658. doi: 10.21608/ejchem.2019.9722.1648
Almutairi, M., Ebraheim, E., Mahmoud, M., Atrees, M., Ali, M., Khawassek, Y. Nanocomposite of TiO2 @ Ni- or Co-doped Graphene Oxide for Efficient Photocatalytic Water Splitting. EKB Journal Management System, 2019; 62(9): 1649-1658. doi: 10.21608/ejchem.2019.9722.1648

Nanocomposite of TiO2 @ Ni- or Co-doped Graphene Oxide for Efficient Photocatalytic Water Splitting

Egyptian Journal of Chemistry
Article 7, Volume 62, Issue 9, September 2019, Page 1649-1658  XML PDF (1.4 MB)
Document Type: Original Article
DOI: 10.21608/ejchem.2019.9722.1648
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Authors
Mohammad M. Almutairi1, 2; Ebraheim E. Ebraheim2; Mohamed S. Mahmoud2, 3; Mohamed S. Atreesorcid 4; Mohamed E. M. Ali email orcid 5; Yasser Mahmoud Khawassekorcid 4
1Ministry of Electricity and Water, Kuwait, Kuwait, P.O.12010
2Chemical Engineering Department, Minia University, El-Minia, 61111, Egypt.
3College of Applied Science, Department of Engineering, Suhar, 331, Oman
4Nuclear Materials Authority, Maadi Road, Elqattamia, Cairo, Egypt. P.O. 530.
5Water Pollution Research Department, Environmental Sciences Division, National Research Centre (NRC), 33 El-Behouth St., Dokki, Cairo, Egypt, P.O. 12622.
Abstract
Nanocomposites of TiO2@Ni-doped or Co-doped graphene oxide (GO) have been suceesfully prepared and are employed for photocalytic water splitting. TEM images showed doted nanostructure and scattered-appearance of Co, Ni with and TiO2 nanoparticles on GO sheet. The XRD patterns proved the existence of the crystal planes of Ni, Co and TiO2 nanoparticles on GO. Moreover, the absorption spectrum of the prepared samples showed a better percentage of absorption of the visible light upon introducing of NiO aor CoO. EDX analysis results confirmed the presence of Co, C, O, and Ti elements in the sample. Interestingly, both n-TiO2/p-NiO/GO and n-TiO2/p-CoO/GO heterojunctions photocatalyst improved the photo-catalytic activity for water splitting nonetheless with different mechanisms. The n-TiO2/p-NiO/GO photocatalyst showed a higher hydrogen production rate of 0.3 mmole/min/g than that of n-TiO2/p-CoO/GO. The generated e/h pairs in the TiO2 part of the catalyst is kept through the effect of the electric field formed by the p-NiO/n-TiO2 heterojunction while Co presence narrows the bandgap and promotes both hydrogen evolution reactions at the conduction and valence band of heterojunctions.
Keywords
graphene oxide; TiO2 nanoparticles; Photocatalyst; water splitting
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