期刊
ENERGY & ENVIRONMENTAL MATERIALS
卷 6, 期 1, 页码 -出版社
WILEY
DOI: 10.1002/eem2.12292
关键词
ammonia borane; hydrogen evolution; palladium; vacancy-atom ensembles; water dissociation
In this study, engineering vacancy-atom ensembles were proposed and implemented by injecting oxygen vacancies (V-O) to form V-O-Pd ensembles in single facet-exposed TiO2-Pd catalysts. The as-prepared catalyst, 1.5-PdTVO, exhibited outstanding activity in water dissociation. Theoretical simulations showed that the V-O-Pd ensemble played a key role in the high catalytic activity.
The dissociation of water is the rate-determining step of several energy-relating reactions due to high energy barrier in homolysis of H-O bond. Herein, engineering vacancy-atom ensembles via injecting oxygen vacancy (V-O) into single facet-exposed TiO2-Pd catalyst to form V-O-Pd ensemble is proposed and implemented. The outstanding activity of as-prepared catalyst, 1.5-PdTVO, toward water dissociation is established with a turnover frequency of 240 min(-1) in ammonia borane hydrolysis at 298 K. Density functional theory simulation suggests that the V-O-Pd ensemble is responsible for the high intrinsic catalytic activity. Water molecules tend to be dissociated on V-O sites and ammonia borane molecules on Pd atoms. Those H atoms from water dissociation on V-O combine with H atoms from ammonia borane on Pd atoms to generate H-2. This insights into engineering vacancy-atom ensembles catalysis provide a new avenue to design catalytic materials for important energy chemical reactions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据