Preprint Article Version 1 This version is not peer-reviewed

Synthesis And Investigation of p-Ni-Doped rGO/n-TiO2 Heterojunction Nanocomposite as an Efficient Catalyst for Photon-Induced Water Splitting

Version 1 : Received: 9 February 2020 / Approved: 10 February 2020 / Online: 10 February 2020 (15:20:21 CET)

How to cite: Atrees, M.; Ismail, E.; S. Mahmoud, M.; Mira, H.; Semari, M.; Eid Ali, M.; khawassek, Y. Synthesis And Investigation of p-Ni-Doped rGO/n-TiO2 Heterojunction Nanocomposite as an Efficient Catalyst for Photon-Induced Water Splitting. Preprints 2020, 2020020129 (doi: 10.20944/preprints202002.0129.v1). Atrees, M.; Ismail, E.; S. Mahmoud, M.; Mira, H.; Semari, M.; Eid Ali, M.; khawassek, Y. Synthesis And Investigation of p-Ni-Doped rGO/n-TiO2 Heterojunction Nanocomposite as an Efficient Catalyst for Photon-Induced Water Splitting. Preprints 2020, 2020020129 (doi: 10.20944/preprints202002.0129.v1).

Abstract

The present study focuses on the synthesis, characterization, and investigation of a p-n heterojunction photocatalysis. Titanium dioxide (TiO2) can’t alone induce the photocatalytic water splitting due to its wide bandgap, which decreases its catalytic activity in the visible light. To make redshift of absorptivity for the TiO2, Nickel (Ni)-doped Graphene (rGO) supported TiO2 was synthesized. Several characterization techniques have been employed to validate the composition and the light absorption ability of the prepared photocatalysts including TEM, SEM, EDS, XRD, XPS, and UV-Vis spectroscopy. The characterization revealed successful doping of the Ni and TiO2 on the rGO nanosheet. Moreover, the UV-Vis spectroscopy indicated a significant shift of light absorption toward the visible spectrum. The photon-induced evolution of H2 was remarkably enhanced using the prepared Ni-rGO/TiO2 nanocomposite. Furthermore, the optimum ratio of rGO: TiO2: Ni in the hybrids was 10:1:4, while the higher Ni ratio would decrease the photocatalytic activity. The stability of the photocatalyst was also verified during 8 cycles of photocatalytic reactions. The kinetic study revealed the nature of the integrated reaction and the controlling step governing the reaction sequence. .

Subject Areas

Graphene; Nanocomposite; photocatalyst; water splitting; hydrogen

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