Reduced Graphene Oxide/InGaZn Mixed Oxide Nanocomposite Photocatalysts for Hydrogen Production

Abstract

A series of reduced graphene oxide and indium-gallium-zinc mixed oxide (RGO/IGZ) nanocomposites were successfully synthesised by a simple one-step hydrothermal method. The as-synthesised nanocomposites were characterised by crystallographic, microscopic, and spectroscopic methods to explore the robust photocatalytic activity of the prepared materials. XRD patterns confirmed the formation of highly pure, single-phase, hexagonal In2 Ga2 ZnO7 with no impurity-related peaks. All the photocatalysts absorbed visible light as observed from the diffuse reflectance UV/Vis spectra. The electron-hole recombination is effectively minimised by the formation of an RGO/metal oxide nanocomposite, which was successfully derived from a photoluminescence (PL) study and photoelectrochemical measurements. The decoration of IGZ nanocrystals onto reduced graphene sheets leads to significant quenching of its luminescent intensity, dramatically improved photocurrent generation (33 times more than neat IGZ) and significantly enhanced photostability. The high photocatalytic activity for H2 production is explained by the strong interaction between the IGZ nanocrystals with RGO sheets, low PL intensity, high photocurrent and large surface area.

Hierarchical Layered WS2/Graphene‐Modified CdS Nanorods for Efficient Photocatalytic Hydrogen Evolution

“…The HRTEM image in Figure d clearly reveals the crystal lattice fringes with spacing of approximately 0.63 nm corresponds to the (0 0 2) plane of WS 2 . These results suggest that the layered WS 2 nanosheets have an intimate contact with graphene sheets and these ultrathin 2 D nanosheets hybrids are supposed to have more active exposed edges for photocatalytic hydrogen production …”

“…The HRTEM image in Figure 1d clearly reveals the crystal lattice fringesw ith spacing of approximately 0.63 nm corresponds to the (0 02)p lane of WS 2 .T hese resultss uggest that the layered WS 2 nanosheets have an intimate contact with graphene sheets and these ultrathin 2D nanosheets hybridsa re supposed to have more active exposed edges for photocatalytic hydrogen production. [40][41][42] The XRD pattern (Figure 2a)o ft he WG sample shows that all the diffractionp eaks of the hybrids are well indexed according to hexagonal WS 2 phase (JCPDS,C ard no. 84-1398).…”

Enhanced photocatalytic activity of nanostructured Fe doped CeO2 for hydrogen production under visible light irradiation

“…So alternatively the surface area increases upto 3 wt% Fe doping to CeO 2 afterwards doping resulted in decrease of surface area that may be due to formation of iron oxide phase which is supported by XRD and Raman analysis. As CF3 nanoparticle displays more surface area, it possesses more reactive site on the surface for effective binding of substrate that enhances the photocatalytic activity of the synthesized photocatalyst [58].…”

Glimpses of the modification of perovskite with graphene-analogous materials in photocatalytic applications

“…Xian et al prepared CaTiO 3 -graphene composites through the conventional method 17 . Xian et al prepared CaTiO 3 -graphene composites through the conventional method 17 .…”