Photogenerated hole traps in metal-organic-framework photocatalysts for visible-light-driven hydrogen evolution.
Zichao LianZhao LiFan WuYueqi ZhongYunni LiuWenchao WangJiangzhi ZiWeiwei YangPublished in: Communications chemistry (2022)
Efficient electron-hole separation and carrier utilization are key factors in photocatalytic systems. Here, we use a metal-organic framework (NH 2 -UiO-66) modified with inner platinum nanoparticles and outer cadmium sulfide (CdS) nanoparticles to construct the ternary composite Pt@NH 2 -UiO-66/CdS, which has a spatially separated, hierarchical structure for enhanced visible-light-driven hydrogen evolution. Relative to pure NH 2 -UiO-66, Pt@NH 2 -UiO-66, and NH 2 -UiO-66/CdS samples, the Pt@NH 2 -UiO-66/CdS composite exhibits much higher hydrogen yields with an apparent quantum efficiency of 40.3% at 400 nm irradiation and stability over the most MOF-based photocatalysts. Transient absorption measurements reveal spatial charge-separation dynamics in the composites. The catalyst's high activity and durability are attributed to charge separation following an efficient photogenerated hole-transfer band-trap pathway. This work holds promise for enhanced MOF-based photocatalysis using efficient hole-transfer routes.
Keyphrases
- visible light
- metal organic framework
- perovskite solar cells
- solar cells
- room temperature
- liquid chromatography
- molecular dynamics
- photodynamic therapy
- gold nanoparticles
- dna methylation
- mass spectrometry
- single cell
- computed tomography
- radiation therapy
- radiation induced
- magnetic resonance imaging
- ionic liquid
- machine learning
- brain injury
- subarachnoid hemorrhage
- contrast enhanced