Boron containing metal–organic framework for highly selective photocatalytic production of H2O2 by promoting two-electron O2 reduction

Autor:	Yuanyuan Liu, Zhaoke Zheng, Zeyan Wang, Baibiao Huang, Peng Wang, Yujie Li, Fahao Ma, Liren Zheng, Ying Dai, Hefeng Cheng
Rok vydání:	2021
Předmět:	Zirconium Process Chemistry and Technology chemistry.chemical_element Electron Decomposition Adsorption chemistry Chemical engineering Mechanics of Materials Photocatalysis General Materials Science Metal-organic framework Surface charge Electrical and Electronic Engineering Boron
Zdroj:	Materials Horizons. 8:2842-2850
ISSN:	2051-6355 2051-6347
DOI:	10.1039/d1mh00869b
Popis:	A zirconium-based metal-organic framework containing boron (UiO-66-B) is prepared, which displays efficient photocatalytic H2O2 production. The H2O2 evolution rate is about 1002 μmol g-1 h-1, much higher than that of most known photocatalysts. Pristine UiO-66 displays a much lower activity (314 μmol g-1 h-1) under the same conditions, suggesting the significant role of boron. Both theoretical calculations and the combined experimental results verify the above conclusion, and the role of boron is ascribed to the following aspects: (1) enhanced O2 adsorption, (2) highly selective proton-coupled two-electron transfer, (3) faster carrier separation and surface charge transfer, and (4) faster generation but slower decomposition rates of H2O2. This work highlights key factors in the two-electron O2 reduction reaction (ORR), presents a deeper understanding of the role of boron in enhancing H2O2 production, and provides a new strategy for designing photocatalysts with excellent H2O2 evolution efficiency.
Databáze:	OpenAIRE
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