王秀娜

个人信息Personal Information

高级工程师

性别:女

毕业院校:大连理工大学

学位:学士

所在单位:化工学院

电子邮箱:xiuna@dlut.edu.cn

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Photocatalytic Water Reduction and Study of the Formation of FeIFe0 Species in Diiron Catalyst Sytems

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论文类型:期刊论文

发表时间:2012-05-01

发表刊物:CHEMSUSCHEM

收录刊物:SCIE、EI、PubMed、Scopus

卷号:5

期号:5,SI

页面范围:913-919

ISSN号:1864-5631

关键字:dyes; pigments; enzymes; hydrogen; iron; photocatalysis

摘要:Noble-metal-free systems with bio-inspired diiron dithiolate mimics of the [FeFe]-hydrogenase active site, namely, [(mu-pdt)Fe2(CO)5L] [pdt=propanedithiolate; L=P(CH2OH)3 (1), P(CH3)3 (2)], as water reduction catalysts with xanthene dyes as photosensitizers and triethylamine as a sacrificial electron donor were studied for visible-light-driven water reduction to hydrogen. These systems display good catalytic activities with the efficiencies in hydrogen evolution of up to 226 turnovers for 1, if Eosin Y was used as the photosensitizer in an environmentally benign solvent (EtOH/H2O) after 15 h of irradiation (?>450 nm) under optimal conditions. Under all of the conditions adopted, 1 that has a water soluble phosphine ligand, P(CH2OH)3 displayed a higher efficiency than 2, which bears a PMe3 ligand. The photoinduced electron transfer in the systems was studied using fluorescence, transient absorption, time-resolved UV/Vis, and in situ electron paramagnetic resonance (EPR) spectroscopy. A new electron-transfer mechanism is proposed for hydrogen evolution by these iron-based photocatalytic systems.