RESUMEN
The catalytic conversion of alcohols under mild conditions is a great challenge because it is constrained by low selectivity and low activity. Herein, we demonstrate a hollow nanotube Fe2 O3 /MoO3 heterojunction (FeMo-2) for the photoelectrocatalytic conversion of small-molecule alcohols. Experimental and theoretical analyses reveal that the optical carrier transfer rate is enhanced by constructing interfacial internal electric fields and Fe-O-Mo charge transfer channels. For the formox process, heterojunctions possess superior HCHO-selective reaction paths and free energy transitions, optimizing the selectivity of HCHO and enhancing the reactivity. FeMo-2 shows a greatly improved performance compared to single Fe2 O3 ; the photocurrent density of FeMo-2 reaches 0.66â mA cm-2 , which is 3.88â times that of Fe2 O3 (0.17â mA cm-2 ), and the Faraday efficiency of the CH3 OH-to-HCHO conversion is 95.7 %. This work may deepen our understanding of interfacial charge separation and has potential for the production of HCHO and for conversion reactions of other small-molecule alcohols at cryogenic temperatures.
RESUMEN
Highly ordered, porous α-Fe2O3/Au nanotube arrays (NTAs) were successfully synthesized through a facile approach. Benefitting from the plasmonic effect, and unique aligned and porous structural features, the α-Fe2O3/Au NTAs offer efficient and stable operation and exhibit a significantly enhanced catalytic activity for photoelectrochemical methanol oxidation with a faradaic efficiency of 79.23%.