放射分析
化学
分解水
氢
溶剂化电子
制氢
氧化物
金属有机骨架
激发态
电子
纳米技术
化学物理
光催化
催化作用
原子物理学
材料科学
物理化学
有机化学
物理
吸附
水溶液
量子力学
作者
Changjiang Hu,Liwei Cheng,Li-Heng Zhou,Zhiwen Jiang,Pingping Gan,Shuiyan Cao,Qiuhao Li,Chong Chen,Yunlong Wang,Mehran Mostafavi,Shuao Wang,Jun Ma
摘要
High-energy radiation that is compatible with renewable energy sources enables direct H2 production from water for fuels; however, the challenge is to convert it as efficiently as possible, and the existing strategies have limited success. Herein, we report the use of Zr/Hf-based nanoscale UiO-66 metal-organic frameworks as highly effective and stable radiation sensitizers for purified and natural water splitting under γ-ray irradiation. Scavenging and pulse radiolysis experiments with Monte Carlo simulations show that the combination of 3D arrays of ultrasmall metal-oxo clusters and high porosity affords unprecedented effective scattering between secondary electrons and confined water, generating increased precursors of solvated electrons and excited states of water, which are the main species responsible for H2 production enhancement. The use of a small quantity (<80 mmol/L) of UiO-66-Hf-OH can achieve a γ-rays-to-hydrogen conversion efficiency exceeding 10% that significantly outperforms Zr-/Hf-oxide nanoparticles and the existing radiolytic H2 promoters. Our work highlights the feasibility and merit of MOF-assisted radiolytic water splitting and promises a competitive method for creating a green H2 economy.
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