relation: https://khub.utp.edu.my/scholars/12317/
title: Fabrication of highly efficient and stable indirect Z-scheme assembly of AgBr/TiO 2 via graphene as a solid-state electron mediator for visible light induced enhanced photocatalytic H 2 production
creator: Shehzad, N.
creator: Tahir, M.
creator: Johari, K.
creator: Murugesan, T.
creator: Hussain, M.
description: In this study, indirect Z-schematic assembly of AgBr and TiO 2 via graphene as a solid-state electron mediator was developed and investigated for photocatalytic H 2 production. The AgBr/rGO/TiO 2 was fabricated using facile two-step synthesis method which includes the growth of AgBr and deposition of TiO 2 on graphene oxide sheets followed by partial reduction through reflux method. The photocatalysts were characterized using TEM, XRD, XPS, FTIR, nitrogen (N 2 ) adsorption and desorption, Raman, PL and UV�Vis spectroscopy to understand morphology, structure, chemical and optical properties. Alterations in band structures, elevation of conduction band positions and reduction in band gap energies of rGO-modified AgBr/TiO 2 photocatalysts were evaluated. The performance of AgBr/rGO/TiO 2 exhibited 2025 ppm of H 2 production, which was 7 fold higher than AgBr/TiO 2 (289 ppm), 2.3 fold higher than rGO/TiO 2 (885 ppm) and 13.4 fold higher than TiO 2 (151 ppm). Enhanced photocatalytic activity of Z-schematic composites can be attributed to strong interfacial bonding (AgBr�rGO�TiO 2 ), efficient transfer of electrons due to synergistic effect of AgBr and rGO as well as extended light absorption due to highly light sensitive AgBr. In addition, yield of H 2 production was decreased above 5 AgBr loading and dosage of 0.10 g of photocatalyst due to incompatibility of ratio and shielding effect of particles. Moreover, with increase of temperature and concentration of hole scavenger, yield of H 2 production was gradually increased which demonstrated the contribution of H 2 from photoreforming of hole scavenger. Based on the experimental and characterizations results, a possible mechanism that highlighted the surface redox reactions and charge transfer pattern on AgBr/rGO/TiO 2 was developed. Thus, indirect Z-scheme assembly of AgBr/rGO/TiO 2 could be a promising photocatalyst for solar energy assisted H 2 production. © 2018 Elsevier B.V.
publisher: Elsevier B.V.
date: 2019
type: Article
type: PeerReviewed
identifier:   Shehzad, N. and Tahir, M. and Johari, K. and Murugesan, T. and Hussain, M.  (2019) Fabrication of highly efficient and stable indirect Z-scheme assembly of AgBr/TiO 2 via graphene as a solid-state electron mediator for visible light induced enhanced photocatalytic H 2 production.  Applied Surface Science, 463.  pp. 445-455.  ISSN 01694332     
relation: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85052644575&doi=10.1016%2fj.apsusc.2018.08.250&partnerID=40&md5=d87702d2ef00087b2120d6a431c36c46
relation: 10.1016/j.apsusc.2018.08.250
identifier: 10.1016/j.apsusc.2018.08.250