Ti2O3/TiO2 heterophase junctions with enhanced charge separation and spatially separated active sites for photocatalytic CO2 reduction
Literature Information
Min Xu, Rui Yan, Haonan Li, Ning Sun, Yang Qu
It is strongly desired to develop highly active photocatalysts for CO2 reduction by accelerating charge separation and realizing spatially separated active sites. In this work, Ti2O3/TiO2 heterophase junctions with enhanced charge separation and spatially separated active sites were facilely prepared via in situ thermal oxidation of commercial Ti2O3 in air at an appropriate annealing temperature. The as-prepared Ti2O3/TiO2 heterophase junctions, especially the temperature-optimized T550 sample, displayed high photocatalytic activity for CO2 reduction to yield CH4 (∼0.65 μmol g−1 h−1), CO (∼2.64 μmol g−1 h−1) and O2 (∼5.66 μmol g−1 h−1), which was 4 times higher than that of bulk Ti2O3 and nearly 2 times higher than that of rutile TiO2. Based on the surface photovoltage spectra, related produced OH radical measurement and electrochemical reduction, the high photoactivity could be attributed to the metallic Ti2O3, which trapped the photogenerated electrons from TiO2 through the formed Ti2O3/TiO2 heterophase junctions to enhance charge separation. Remarkably, it was confirmed from theoretical calculations based on density functional theory, Kelvin probe and CO2-TPD measurements that the Ti2O3/TiO2 heterophase junction possesses spatially separated active sites for CO2 reduction and water oxidation. Metallic Ti2O3 as a reduction site activated and catalyzed CO2 to produce solar fuels such as CO and CH4, while TiO2 as an oxidation site oxidized H2O to produce O2 and protons. The designed concept of heterophase junctions and simultaneously activating CO2 and H2O at different spatial sites may offer a new strategy to suppress the reverse reactions during photocatalysis for efficient solar energy conversion.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.










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