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Plasmonic Ru/hydrogen molybdenum bronzes with tunable oxygen vacancies for light-driven reduction of p-nitrophenol

Yin, Haibo, Kuwahara, Yasutaka, Mori, Kohsuke, Che, Michel, Yamashita, Hiromi
Journal of materials chemistry A 2019 v.7 no.8 pp. 3783-3789
X-ray diffraction, X-ray photoelectron spectroscopy, chemical bonding, green chemistry, hydrogen, irradiation, light, molybdenum, oxygen, p-nitrophenol, photocatalysis, reflectance, ruthenium, semiconductors, stoichiometry, temperature, toxicity, transmission electron microscopy
To meet the requirement of high catalytic efficiency toward the reduction of toxic p-nitrophenol (PNP) to useful p-aminophenol (PAP), we herein report Ru supported on heavily hydrogen-doped semiconductors, specifically Ru/hydrogen molybdenum bronzes (Ru/HₓMoO₃₋y), which is prepared via a facile H-spillover route. Detailed characterization by means of UV-vis-NIR diffuse reflectance, XRD, TEM, and XPS measurements reveals that Ru/HₓMoO₃₋y (100) (100 means the hydrogen reduction temperature (°C)) exhibits strong visible light absorption with a plasmonic peak at around 690 nm, which can be tunable by varying its stoichiometry. Under visible light irradiation, the Ru/HₓMoO₃₋y (100) hybrid displays superior catalytic activity to photocatalytic reduction of PNP relative to that under dark conditions, in which HₓMoO₃₋y acts as electron-donor centres and Ru NPs act as active centres. More importantly, a proposed mechanism for the N–O bond reduction on the Ru/HₓMoO₃₋y hybrid is presented. This study provides a new avenue to design efficient plasmonic metal/semiconductor hybrids for green chemistry.