National Center for Nanoscience and Technology, 11 Zhongguancun Beiyitiao, Beijing 100190, People's Republic of China.
J Am Chem Soc. 2011 Jul 20;133(28):10878-84. doi: 10.1021/ja2025454. Epub 2011 Jun 24.
The production of clean and renewable hydrogen through water splitting using photocatalysts has received much attention due to the increasing global energy crises. In this study, a high efficiency of the photocatalytic H(2) production was achieved using graphene nanosheets decorated with CdS clusters as visible-light-driven photocatalysts. The materials were prepared by a solvothermal method in which graphene oxide (GO) served as the support and cadmium acetate (Cd(Ac)(2)) as the CdS precursor. These nanosized composites reach a high H(2)-production rate of 1.12 mmol h(-1) (about 4.87 times higher than that of pure CdS nanoparticles) at graphene content of 1.0 wt % and Pt 0.5 wt % under visible-light irradiation and an apparent quantum efficiency (QE) of 22.5% at wavelength of 420 nm. This high photocatalytic H(2)-production activity is attributed predominantly to the presence of graphene, which serves as an electron collector and transporter to efficiently lengthen the lifetime of the photogenerated charge carriers from CdS nanoparticles. This work highlights the potential application of graphene-based materials in the field of energy conversion.
通过光催化水分解生产清洁可再生的氢气，由于全球能源危机的加剧，引起了广泛关注。在这项研究中，使用石墨烯纳米片修饰的 CdS 团簇作为可见光驱动的光催化剂，实现了高效的光催化 H2 生产。该材料是通过溶剂热法制备的，其中氧化石墨烯（GO）作为载体，醋酸镉（Cd（Ac）（2））作为 CdS 前体。这些纳米复合材料在石墨烯含量为 1.0wt%和 Pt 0.5wt%时，在可见光照射下达到了 1.12mmol h(-1)的高 H2 生成速率（比纯 CdS 纳米粒子高 4.87 倍），在 420nm 波长下的表观量子效率（QE）为 22.5%。这种高的光催化 H2 生成活性主要归因于石墨烯的存在，它作为电子收集器和传输体，有效地延长了 CdS 纳米粒子光生载流子的寿命。这项工作突出了基于石墨烯的材料在能源转换领域的潜在应用。
