| 查看: 154 | 回复: 0 | |||
| 当前主题已经存档。 | |||
飞翔的蜘蛛银虫 (正式写手)
|
[交流]
Towards Bio-inspired Hydrogen Production Without Noble Metals
|
||
|
Towards Bio-inspired Hydrogen Production Without Noble Metals This news is from ScienceDaily. Using hydrogen as an energy vector and in fuel cells may provide solutions to the specific energy challenges of the 21st century. Hydrogen production is currently based on the catalytic properties of “noble” metals such as platinum. For the first time, researchers at the joint Laboratoire de chimie et biologie des métaux (metal chemistry and biology, CEA-CNRS-Université Joseph Fourier, CEA's Grenoble site) have succeeded in producing hydrogen with a molecular system that doesn't require a noble metal catalyst. This outcome has important implications for the financial future of hydrogen energy. Research to improve hydrogen production is based largely on chemical reactions observed during photosynthesis in plants. More specifically, certain micro-organisms produce hydrogen from water with the help of light. To reproduce and adapt these processes, researchers have developed molecular systems capable of both photosensitisation, which captures light energy, and catalysis, which uses the energy collected to liberate hydrogen from water. To date, all the technological systems developed to produce or use hydrogen rely on noble metals(1) such as platinum. But platinum reserves are limited. The metal’s scarcity and cost are obstacles to the long-term financial prospects of hydrogen technologies, despite efforts to reduce the quantities used in electrolysers and fuel cells. Current research focuses on alternatives to platinum, by developing catalysts based on metals which are naturally more abundant and less expensive, such as those used by natural organisms (iron, nickel, cobalt, manganese). A new system has been developed using a cobalt-based catalyst. Supramolecular in nature, it plays the role of both the photosensitiser and the catalyst. With the help of light, the electrons from the organic molecule are used to liberate hydrogen from water. This is catalysed by cobalt with greater efficiency than comparable systems using noble metals (Pd, Rh and Pt). Ruthenium is still used as the photosensitiser (Ru, left side of the figure); one of the next steps in this work will be finding an alternative. While the ultimate goal is still to use water as a proton and electron source (to avoid adding an organic molecule), this outcome represents considerable progress towards the photoproduction of hydrogen. Note: 1) Historically, noble metals were the precious metals used to make jewellery (gold, silver, platinum). Chemists define them as metals which do not oxidise easily. Today this term is applied to metals present at low levels in the earth's crust, making them both rare and costly (palladium, rhodium, iridium, osmium and ruthenium) This research was published on 4 January, 2008 in the journal Angewandte Chemie International Edition. 文章名称 Cobaloxime-Based Photocatalytic Devices for Hydrogen Production 链接 http://www3.interscience.wiley.c ... 117868965/HTMLSTART |
回复此楼» 猜你喜欢
中国水产科学研究院黄海水产研究所博士后科研工作站2026年博士后招收公告
已经有0人回复
-
大连海事大学国家级人才团队2026年博士研究生招生启事（氢能）
已经有10人回复
-
专业论文润色/翻译怎么收费?
已经有78人回复
-
国家级人才课题组招收2026年入学博士
已经有6人回复
-
意大利米兰理工大学急聘CSC公派留学博士生（物理或无机材料科学方向）
已经有47人回复
-
求加氢处理工艺与工程（第二版）pdf 李大东 中国石化出版社 9787511436689
已经有0人回复
-
新加坡ASTAR招收CSC或学校资助联培博士生/访问学生
已经有2人回复
-
求助Amsterdam Density Functional
已经有2人回复
-
Postdoctoral Research Fellow Position in Causal Inference Weill CorneIl Medicine
已经有8人回复
-
武汉纺织大学全国重点实验室陈嵘教授团队招收2026级学术/专业型硕士研究生
已经有0人回复