TY  - JOUR
Y1  - 2019///
A1  - Shehzad, N.
A1  - Tahir, M.
A1  - Johari, K.
A1  - Murugesan, T.
A1  - Hussain, M.
JF  - Applied Surface Science
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85052644575&doi=10.1016%2fj.apsusc.2018.08.250&partnerID=40&md5=d87702d2ef00087b2120d6a431c36c46
VL  - 463
N2  - 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 UVâ??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 (AgBrâ??rGOâ??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.
ID  - scholars12317
KW  - Assembly; Charge transfer; Chemical bonds; Electrons; Energy gap; Fabrication; Fourier transform infrared spectroscopy; Graphene; Hole concentration; Hydrogen; Hydrogen production; Light; Light absorption; Optical properties; Photocatalysts; Redox reactions; Silver halides; Solar energy; Surface reactions; Titanium dioxide
KW  -  Adsorption and desorptions; Photocatalytic activities; Possible mechanisms; Silver bromide; Solid-state electron; Titania; Two step synthesis method; Visible light induced
KW  -  Bromine compounds
PB  - Elsevier B.V.
SN  - 01694332
EP  - 455
AV  - none
N1  - cited By 72
SP  - 445
TI  - 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
ER  -