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

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Boron containing metal–organic framework for highly selective photocatalytic production of H2O2 by promoting two-electron O2 reduction
Materials Horizons ( IF 12.2 ) Pub Date : 2021-09-02 , DOI: 10.1039/d1mh00869b
Yujie Li ₁ , Fahao Ma ₁ , Liren Zheng ₁ , Yuanyuan Liu ₁ , Zeyan Wang ₁ , Peng Wang ₁ , Zhaoke Zheng ₁ , Hefeng Cheng ₁ , Ying Dai ₂ , Baibiao Huang ₁

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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.

中文翻译：

含硼金属有机骨架通过促进双电子 O2 还原高选择性光催化生产 H2O2

制备了一种含硼的锆基金属-有机骨架材料（UiO-66-B），其具有高效的光催化 H ₂ O ₂生产能力。H ₂ O _{2 的}析出速率约为1002 μmol g ^-1 h ^-1，远高于大多数已知的光催化剂。在相同条件下，原始 UiO-66 显示出低得多的活性（314 μmol g ^-1 h ^-1），表明硼的重要作用。理论计算和综合实验结果均验证了上述结论，硼的作用主要归因于以下几个方面： (1)增强O ₂吸附，(2) 高选择性质子耦合的双电子转移，(3) 更快的载流子分离和表面电荷转移，以及 (4) 更快的生成但较慢的 H ₂ O ₂分解速度。这项工作突出了双电子 O ₂还原反应 (ORR)中的关键因素，加深了对硼在增强 H ₂ O ₂生成中的作用的理解，并为设计具有优异 H ₂ O ₂演化的光催化剂提供了新策略效率。

更新日期：2021-09-06

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