Abstract
A kind of high dispersed gold catalyst supported on the spinel ZnCo2O4 nanosheets was readily fabricated by a facile template-free wet chemical method for CO oxidation in H2-rich streams at room temperature under visible light irradiation or not, which was found to be a high performance catalyst. As verified by X-ray powder diffractometry (XRD), Raman spectra, N2 adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscope (XPS), photoelectrochemical measurement and photoluminescence (PL) spectra results, the contribution of high crystallinity, the enhanced mass and charge transport, the longer lifetime of surface electrons as well as the optical absorbance properties on Au/ZnCo2O4 enabled the superior CO preferential oxidation. Notably, electron paramagnetic resonance (EPR) and CO chemisorption (TPD-MS) results indicate that visible light could promote the adsorption and activation of both CO and O2 at Au/ZnCo2O4 due to both the photo-response of Au nanoparticles and the photo-excitation of ZnCo2O4 band gap under visible light irradiation. This study indicates that Au/ZnCo2O4 may be highly desirable for a promising photo-assisted Au catalyst.
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