Reduced {001}-TiO2-x photocatalysts: noble-metal-free CO2 photoreduction for selective CH4 evolution

Physical Chemistry Chemical Physics : PCCP
Wenzhang FangJinlong Zhang

Abstract

The preparation of reduced TiO2 photocatalysts with high Ti3+ concentration is a great challenge due to their instability in air. Here we report a new approach for the synthesis of reduced TiO2 with {001} facets exposed via a hydrothermal process. By the introduction of fluoride atoms, {001} and {101} facets are formed, which act as hole and electron collectors, respectively, for charge separation. By adjusting the volume of HF added, a rutile-anatase transition is observed for the first time. EPR spectra confirm the generation of Ti3+ species in the bulk of TiO2, and Ti3+ signals are studied in the anatase and rutile phases separately. The quantified EPR shows that reduced TiO2 samples present 14 000-fold more spins compared to the pristine TiO2, and the intensity can reach as high as 24.6 × 1019 spins per g. The obtained samples also have a unique disordered layer with a thickness of 1-2 nm on their surfaces, which contributes to the stabilization of the formed Ti3+ species by preventing their oxidation in air. In addition, the synthesized reduced TiO2 samples also exhibit wide-spectrum solar light absorption, especially in the near-infrared region. Owing to their enhanced solar light absorption, improved electron-hole separa...Continue Reading

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Citations

Jan 12, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Athanasios Chatzitakis, Sabrina Sartori
Mar 5, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Sweta GahlotShashank Mishra
Feb 23, 2020·Nanomaterials·Thang Phan NguyenQuyet Van Le
Sep 16, 2020·Chemistry, an Asian Journal·Minhua AiJi-Jun Zou
Jun 25, 2021·Chemical Science·Sushma A RawoolVivek Polshettiwar
Feb 15, 2019·Chemical Reviews·Xin LiXiaobo Chen
Jul 4, 2018·ACS Applied Materials & Interfaces·Dongxing TanBuxing Han

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