摘要
The rational design of semiconductor nanostructures is of utmost importance for efficient solar energy conversion and environmental remediation.In this article,we report high-surface-area mesoporous networks consisting of Ni-implanted cubic CoO(Co_(1−x)Ni_(x)O)nanoparticles as promising catalysts for the detoxification of aqueous Cr(VI)solutions.Mechanistic studies with X-ray photoelectron,UV-vis optical absorption,fluorescence and electrochemical impedance spectroscopy and theoretical(DFT)calculations indicate that the performance enhancement of these catalysts arises from the high charge transfer kinetics and oxidation efficiency of surface-reaching holes.By tuning the chemical composition,the Co_(1−x)Ni_(x)O mesoporous catalyst at 2 atomic%Ni content imparts outstanding photocatalytic Cr(VI)reduction and water oxidation activity,corresponding to an apparent quantum yield(QY)of 1.5%atλ=375 nm irradiation light.
基金
Special Account for Research Funds of the University of Crete(SARF UOC)(KA 10138)。
