Details

Autor(en) / Beteiligte

• Ren, Hai-Tao
• Cai, Chao-Chen
• Zhu, Peng-Yue
• Wang, Cong
• Wu, Song-Hai
• Liu, Yong
• Han, Xu

Titel

Photocatalytic Generation of H 2 O 2 Via a Hydrogen-Abstraction Pathway by Bi 2.15 WO 6 under Visible Light

Ist Teil von

• Langmuir, 2024-04, Vol.40 (14), p.7384-7394

Ort / Verlag

United States

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Photocatalytic technology is a popular research area for converting solar energy into environmentally friendly chemicals and is considered the greenest approach for producing H O . However, the corresponding reactive oxygen species (ROS) and pathway involved in the photocatalytic generation of H O by the Bi WO -glucose system are still not clear. Quenching experiments have established that neither OH nor h contribute to the formation of H O , and show that the formed surface superoxo (≡Bi-OO ) and peroxo (≡Bi-OOH) species are the predominant ROS in H O generation. In addition, various characterizations indicate the enhanced electron-transfer on the surface of Bi WO with increasing contents of glucose via the ligand-to-metal charge transfer pathway, confirming H-transfer from glucose to ≡Bi-OO or ≡Bi-OOH. The increased production of H O with decreasing bond dissociation energy (BDE ) values of various phenolic compounds again supports the H-transfer mechanism from phenolic compounds to ≡Bi-OO and then to ≡Bi-OOH. DFT calculations further reveal that on the Bi WO surface, oxygen is sequentially reduced to ≡Bi-OO and ≡Bi-OOH, while H-transfer from H O or glucose to ≡Bi-OO and ≡Bi-OOH, resulting in the production of H O . The lower energy barrier of H-transfer from adsorbed glucose (0.636 eV) than that from H O (1.157 eV) indicates that H-transfer is more favorable from adsorbed glucose. This work gives new insight into the photocatalytic generation of H O by Bi WO in the presence of glucose/phenolic compounds via the H-abstraction pathway.