摘要
氢是一种清洁高效的理想燃料。利用太阳能制氢是直接将太阳能高效转化为化学能的有效方式。通过分子组装构筑了一系列高效太阳能光催化制氢的新体系,分子组装体高效的能量传递、电子转移和电荷分离过程显著提高了催化体系的产氢效率和稳定性。例如:采用低温水热方法制备的多级Sn2Nb2O7空心球可见光催化剂和采用多元醇热注入法制备的由超薄纳米片组装而成的分等级花状结构Zn In2S4亚微米球均表现出优异的光解水产氢性能;利用树枝状聚合物、聚丙烯酸和壳聚糖开展对铁氢化酶外围保护蛋白的模拟和功能性研究,在国际上率先突破了铁氢化酶模拟化合物稳定性差、催化效率低的瓶颈,实现了太阳光驱动铁氢化酶模拟化合物的水相高效产氢。
Hydrogen is one of the most ideal clean fuels because of its high density of energy and environmentally benigncombustion product (water). Photocatalytic hydrogen production from water splitting has attracted much attention because itis promising for conversion of sustainable solar energy into chemical energy. In this project, we focus on the construction ofa variety of molecular assemblies for hydrogen evolution under illumination of visible light. By modulating energy/electrontransfer and long-lived charge separation, we are able to achieve photocatalytic hydrogen productive with higher efficiencyand stability in the designed molecular assemblies. For example, hierarchical Sn2Nb2O7 hollow spheres were prepared for thefirst time via a facile hydrothermal route using bubbles generated in situ from the decomposition of urea as soft templates.Flower-like spherical ZnIn2S4 superstructures about 500 nm in diameter composed of ultrathin 2～3 nm thick mesoporousnanosheets were synthesized in several minutes by facile polyol-mediated hot-injection. These as-obtained hollow spheres andlower-like spherical ZnIn2S4 with a large specific surface area show improved visible-light-driven photocatalytic hydrogenproduction activity in aqueous solutions. Inspired by natural photosynthesis, a series of artificial [FeFe]-H2ase photocatalyticsystems have been constructed using poly(aryl ether) dendrimers, poly(acrylic acid), and chitosan with PS and Fe2S2 activesite of [FeFe]-H2ase mimics. Irradiation of these systems with visible light results in the formation of long-lived reducedintermediates, and thus increasing the efficiency and durability of hydrogen photoproduction remarkably.
作者
陈彬
张铁锐
曾毅
Chen Bin;Zhang Tierui;Zeng Yi(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
出处
《科技资讯》
2016年第23期178-178,共1页
Science & Technology Information
关键词
分子组装体
光解水制氢
电子转移
Molecular assemblies
Photocatalytic hydrogen evolution
Electron transfer
