by Commission of the European Communities, Directorate-General for Research, Science and Education in Luxembourg .
Written in English
|Statement||C. Veeger, A. Harder, H.M. van der Westen.|
|Contributions||Harder, A., Westen, H. M. van der.|
Immobilized chloroplast-ferredoxin-hydrogenase system for the simultaneous photoproduction of hydrogen and oxygen Hydrogen production at the rate of liter hydrogen gas per minute per gram support has been achieved at 37C with an immobilized hydrogenase isolated from Desulfovibrio gigas. The ability of immobilized hydrogenase to evolve hydrogen when coupled to illuminated chloroplasts has been demonstrated, and work is in progress to optimize the method Photochemical hydrogen production with molecular devices comprising a zinc porphyrin and a cobaloxime catalyst. Ott S. Iron hydrogenase active site mimics in supramolecular systems aiming for light driven hydrogen production. Coord Chem Rev, ?. Hydrogen production by nitrogenase, however, is an energy-consuming process due to hydrolysis of ATP molecules (at least 4 per 1 mol of hydrogen). On the other hand, hydrogenasemediated hydrogen production by cyanobacteria and green algae is economic due to the nonrequirement of ATP, although it is not sustainable under light ://
The production of hydrogen by means of biological systems represents one of the most important challenges for biotechnology applied to environmental problems. The efficiency with which solar energy is converted to chemical energy by biological systems is currently quite low, although this is offset somewhat by the low investment costs required We have developed complexes of CdS nanorods capped with 3-mercaptopropionic acid (MPA) and Clostridium acetobutylicum [FeFe]-hydrogenase I (CaI) that photocatalyze reduction of H+ to H2 at a CaI turnover frequency of – s–1 and photon conversion efficiencies of up to 20% under illumination at nm. In this paper, we focus on the compositional and mechanistic aspects of a cathode carrying a hydrogenase or an artificial hydrogenase catalyst in order to recombine protons and electrons into molecular hydrogen. Here again, initial studies involve immobilizing the natural enzymes, including those with low sensitivity to oxygen. Also, as for the water splitting site on the anodic side of the membrane, the longer term goal will be to synthesize a catalytic site Today, hydrogen production via electrolysis only meets the U.S. Department of Energy (DOE) goals of $2-$3 per kilogram (kg) in large installations where electrolyzer capital costs are low, less
Tianjun Yu, Yi Zeng, Jinping Chen, Ying‐Ying Li, Guoqiang Yang, Yi Li, Exceptional Dendrimer‐Based Mimics of Diiron Hydrogenase for the Photochemical Production of Hydrogen, Angewandte Chemie International Edition, /anie, 52, 21, (), (). Hydrogen Photoproduction by Immobilized N 2-Fixing Cyanobacteria: Understanding the Role of the Uptake Hydrogenase in the Long-Term Process Sergey Kosourov, aHannu Leino, Gayathri Murukesan, Fiona Lynch,a Kaarina Sivonen,b Anatoly A. Tsygankov,c Eva-Mari Aro, Yagut Allahverdiyevaa MolecularPlantBiology,DepartmentofBiochemistry,UniversityofTurku,Turku,Finlanda In this frame, experiments for formation of hydrogen gas by coupling isolated chloroplasts to bacterial hydrogenase were performed. The major limitation of H 2 production by such systems was the progressive destabilization of the activities of hydrogenase and :// The diiron carbonyl cluster is held by a native CXXC motif, which includes Cys14 and Cys17, in the cytochrome c sequence. It is found that the diiron carbonyl complex works well as a catalyst for H2 evolution. It has a TON of ∼80 over 2 h at pH in the presence