Photoelectrochemical CO2 reduction by Cu2O/Cu2S hybrid catalyst immobilized in TiO2 nanocavity arrays
Source abstract
Abstract
Photoelectrocatalytic CO2 reduction to CO was achieved on Cu2O/Cu2S nanoparticles which are immobilized in TiO2 nanocavity array. The Cu2S shell was obtained by ions exchange reaction of O2− and S2− on the surface of Cu2O by a chemical vapor deposition with Na2S precursor. This coating can protect the Cu2O nanoparticle from photocorrosion during photocatalysis. The lower resistance and plasmonic absorbance endow a superior activity of the Cu2O/Cu2S heterostructures toward photoelectrochemical reduction of CO2. It exhibits a current density of 10.7 mA cm−2 at the overpotential of − 0.26 V with a CO faradaic efficiency (FE) higher than 81%. The excellent photo-assisted catalytic performance (photo-induced current increment is more than 50%) is attributed to the localized surface plasmonic resonance of Cu2S coatings and highly ordered hierarchical structure of the Cu2O/Cu2S nanoparticles, which facilitate charge carrier separation and mass transfer. These hybrid electrodes demonstrate a long-term stability by resisting photocorrosion within 5 h with a higher FE of CO2 to CO conversion.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · CO2 Reduction Techniques and Catalysts · Copper-based nanomaterials and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (26)
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