Efficient sunlight driven CO2 reduction on Graphene-wrapped Cu-Pt/rTiO2 @ SiO2

Abstract

The Photoreduction of CO2 provides a promising way to solving environmental issues. In this work, hydrogen-doped Titania powders were fabricated using NaBH4 heated with TiO2 at 350 °C. The reduced Titania was decorated with Platinum nanoparticles by Poly (N-vinyl-2-pyrrolidone) PVP protected Pt solution. The copper precursor was mixed with the previous sample to get Cu-Pt bi-metal co-catalysts deposited on the surface of reduced TiO2. After wrapping with graphene oxide (GO) sheets, core-shell-structured photocatalysts graphene-wrapped Cu-Pt/rTiO2 be synthesized. A systematic study of CO2 photoreduction performance of graphene-wrapped Cu-Pt/rTiO2 was conducted using the on-line GC system with SiO2 fiber as the substrate. Under AM1.5 G simulated sunlight, the graphene-wrapped Cu-Pt/rTiO2 @ SiO2 produced carbon monoxide (394.84 μmol g-1cat 1. h−1) from CO2 with remarkable selectivity reaching 99%. Over 7 h of illumination period, the prepared sample was showing excellent stability with no decrease in origin CO2 conversion rate. Elemental mapping and transmission electron microscopy images confirmed Cu-Pt bi-metal nanoparticles deposited on the surface of TiO2 nanoparticles. The Inert gas control group test confirmed that carbon monoxide products originate from CO2.