Cationic vacancy engineering of p-TiO₂ for enhanced photocatalytic nitrogen fixation

Abstract

Defect engineering is one of the effective strategies to regulate and control catalyst properties. Constructing appropriate catalytic active centers effectively tunes the electronic andsurface properties of the catalyst to achieve...

The quantitative contribution of interfacial coexisting Mn and O vacancies to MnO2 photocatalytic degradation of phenol

“…7b shows the removal of total organic carbon (TOC) in the reaction, which demonstrates the production of by-products in the reaction. The reactive oxygen species (ROS) of V Mn,O were determined by EPR 44 (Fig. 7c), and the 3, 4 and 7 characteristic peaks correspond to the singlet oxygen ( 1 O 2 ), hydroxyl radical (OH·), and superoxide anion (O 2 ˙ − ), respectively.…”

“…Wang et al 11 constructed Bi 2 WO 6 hollow microspheres with oxygen vacancies and found that their high catalytic effect originated from the fast charge transfer hindering carrier complexation. Ding et al 12 constructed Ti vacancy-rich p -TiO 2 and found that its high photocatalytic efficiency was due to the stronger carrier separation and transport.…”

Defect engineering: the role of cationic vacancies in photocatalysis and electrocatalysis

“…5 Therefore, XPS can serve as a robust technique for the identification of cationic vacancies or unsaturated sites within defective materials in comparison to defect-free materials. The presence of Ti vacancy defects was probed via XPS by Ding et al 52 As shown in Fig. 6e and f, the XPS peaks of p-TiO 2 exhibit a shift towards higher binding energy compared to those of n-TiO 2 .…”

“…The concentration of vacancies exhibited a gradual decrease as the treatment temperature increased, potentially attributed to atomic rearrangement. Ding et al 52 employed EPR to investigate Ti cation vacancies in TiO 2 (Fig. 6h).…”

“…The results demonstrate that SUC Bi 3 O 4 Br, which is rich in defects, exhibits enhanced nitrogen fixation activity. Ding et al 52 synthesized titanium vacancy-rich ( V Ti ) undoped anatase p-TiO 2 and investigated the effect of its metal vacancies on the performance of photocatalytic nitrogen reduction reactions. The photocatalytic nitrogen fixation performance of p-TiO 2 , enriched with Ti vacancies, exhibited a remarkable achievement of 47.13 μmol g −1 h −1 , demonstrating excellent overall stability after 5 cycles.…”