Chemistry Times
Recent News |  Archives |  Tags |  About |  Newsletter |  Submit News |  Links |  Subscribe to ChemistryTimes.com RSS Feed Subscribe


More Articles
A new species of horseshoe worm discovered in Japan after a 62 year gapA new species of horseshoe worm discovered in Japan after a 62 year gap

Galactic serial killerGalactic serial killer

Domain walls in nanowires cleverly set in motionDomain walls in nanowires cleverly set in motion

Faithful allies since the CretaceousFaithful allies since the Cretaceous

Earthquake simulation tops 1 quadrillion flopsEarthquake simulation tops 1 quadrillion flops

Babies prefer fairness -- but only if it benefits them -- in choosing a playmateBabies prefer fairness -- but only if it benefits them -- in choosing a playmate

Positive, negative thinkers' brains revealedPositive, negative thinkers' brains revealed

Ancient 'spider' images reveal eye-opening secretsAncient 'spider' images reveal eye-opening secrets

Future computers that are 'normally off'Future computers that are 'normally off'

An ultrathin collagen matrix biomaterial tool for 3D microtissue engineeringAn ultrathin collagen matrix biomaterial tool for 3D microtissue engineering

Friedreich's ataxia -- an effective gene therapy in an animal modelFriedreich's ataxia -- an effective gene therapy in an animal model

Chikungunya poised to invade the AmericasChikungunya poised to invade the Americas

A new twist makes for better steel, researchers findA new twist makes for better steel, researchers find

Renewable energy market share climbs despite 2013 dip in investmentsRenewable energy market share climbs despite 2013 dip in investments

Research suggests autumn is ending later in the northern hemisphereResearch suggests autumn is ending later in the northern hemisphere

'Unzipping' poplars' biofuel potential'Unzipping' poplars' biofuel potential

Sniff study suggests humans can distinguish more  than 1 trillion scentsSniff study suggests humans can distinguish more than 1 trillion scents

Study finds gaming augments players' social livesStudy finds gaming augments players' social lives

Off the shelf, on the skin: Stick-on electronic patches for health monitoringOff the shelf, on the skin: Stick-on electronic patches for health monitoring

A breakthrough in creating invisibility cloaks, stealth technologyA breakthrough in creating invisibility cloaks, stealth technology

Overcoming structural uncertainty in computer modelsOvercoming structural uncertainty in computer models

Monkey caloric restriction study shows big benefit; contradicts earlier studyMonkey caloric restriction study shows big benefit; contradicts earlier study

Researchers developed world's first fluorescent sensor to detect date rape drugResearchers developed world's first fluorescent sensor to detect date rape drug

Protein called YAP gives blood vessels strength, shapeProtein called YAP gives blood vessels strength, shape

Strengthening learning in children: Get outside and playStrengthening learning in children: Get outside and play

Copied from nature: Detecting software errors via genetic algorithmsCopied from nature: Detecting software errors via genetic algorithms

Turning back the clock on aging muscles?Turning back the clock on aging muscles?

Gecko-inspired adhesion: Self-cleaning and reliableGecko-inspired adhesion: Self-cleaning and reliable

New study finds differences in concussion risk between football helmetsNew study finds differences in concussion risk between football helmets

How the first step affects the (watery) result (6/26/2010)

Tags:
hydrogen
These are scientists Dr. Stefanie Tschierlei and Dr. Michael Schmitt working in a spectroscopy laboratory of Jena University. -  Photo: FSU
These are scientists Dr. Stefanie Tschierlei and Dr. Michael Schmitt working in a spectroscopy laboratory of Jena University. - Photo: FSU

Energy from hydrogen - scientists from all over the world work on this solution to overcome the energy crisis. Amongst other things they try to use the sunlight as driving force for the splitting of water into hydrogen and oxygen. In trying to copy the photosynthesis in the laboratory a team of scientists of the Universities of Jena and Erlangen-Nürnberg and of the Institute of Photonic Technology (IPHT) in Jena (Germany) made a huge step forward. The physiccists and chemists were able to prove in their tests, that the first step already affects the efficiency of hydrogen generation. "This is as if you would decide about where you´re going to by turning the ignition key in the car," says PD Dr Michael Schmitt from the Institute of Physical Chemistry (IPC) of the University of Jena. To put it scientifically: "The Franck-Cordon-point has to be created in such a way that the initial process of transferring electrons already points into the direction of the catalytic active center." The results were published in the science journal ?Angewandte Chemie Int. Ed.".

In their tests for a more efficient energy conversion the scientists focus on chemical photo catalysts. With this light is being used to let electrons "jump" well-directed from one subunit of the molecule to the other or to transport them over a ligand, which is a "bridge".

Like the photosynthesis this process, which the chemists run in the laboratory, works in two main steps: A special metal complex with Ruthenium as its main component serves as an antenna which harvests the light. The Ruthenium then transfers an electron onto the reaction center. The core of the reaction center is a Palladium atom. At this metal center the hydrogen is finally generated. But other than in nature not all electrons reach the palladium center from the Ruthenium in the laboratory construction. Some choose "detours", some enter "roundabouts" or "blind alleys" and thus are being lost for the reaction. "Supported by resonance Raman spectroscopy we were able to watch and see where the electron ends after directly after the photoexitation," describes Prof Dr Juergen Popp, director of IPC and IPHT. ?Thereby we were able to develop a new synthesis paradigm", Michael Schmitt adds. The team of scientists could prove that the efficiency of hydrogen generation depends on the light wavelength. It is more efficient the redder the light used for photo excitation is - light of a wavelength of 550 nm is ideal. "The redder the light the more electrons are transferred to the ligand, that connects the Ruthenium with the Palladium", Schmitt says. Moreover the initial absorption step decides where the electron goes and thus how effective the generation of energy is.

"This knowledge enables us to put up well-directed barriers so that the electrons don´t take a ,wrong turn' but exclusively end up at the Palladium", says Prof Popp explaining the application potential of this fundamental research. In the laboratory the hydrogen generation is four times above former data but still far below the necessary rate. Now it is up to the chemists, like the participating Prof. Dr Sven Rau, to optimize the molecular catalysts, that "no electrons will be taken on by terminal ligands," as Schmitt explains.

The scientists know that it is still a long way to go to copy the photosynthesis of nature correctly and efficiently. "But due to our spectroscopic analysis we took a huge step on this way", Prof Popp is sure though.

Note: This story has been adapted from a news release issued by the Friedrich-Schiller-Universität Jena

Post Comments:

Search
New Articles
Next-generation coatings and sensors that can operate in extreme conditions

New gel allows for targeted therapy after heart attackNew gel allows for targeted therapy after heart attack

Researchers developing cheap, better-performing lithium-ion batteries

Scientists find missing piece of air particle equation hiding in the walls

Researchers announce first phononic crystal that can be altered in real timeResearchers announce first phononic crystal that can be altered in real time

International team using shape memory alloys to rehab concrete structuresInternational team using shape memory alloys to rehab concrete structures

Hybrid vehicles more fuel efficient in India, China than in US

Heat-conducting polymer cools hot electronic devices at 200 degrees CHeat-conducting polymer cools hot electronic devices at 200 degrees C

Research center to develop next generation of advanced chemical products

Fingerprint of dissolved glycine in the Terahertz range explainedFingerprint of dissolved glycine in the Terahertz range explained

Driving research on hydrogen fuel cells

Scientists track 3D nanoscale changes in rechargeable battery material during operationScientists track 3D nanoscale changes in rechargeable battery material during operation

Robotic arm probes chemistry of 3-D objects by mass spectrometryRobotic arm probes chemistry of 3-D objects by mass spectrometry

Sugar, not oilSugar, not oil

New infrared technique aims to remotely detect dangerous materials



Archives
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007


Science Friends
Agricultural Science
Astronomy News
Sports Tech
Biology News
Biomimicry Science
Cognitive Research
Tissue Engineering
Cancer Research
Cybernetics Research
Electonics Research
Forensics Report
Fossil News
Genetic Archaeology
Genetics News
Geology News
Microbiology Research
Nanotech News
Parenting News
Physics News


  Archives |  Submit News |  Advertise With Us |  Contact Us |  Links
Use of this site constitutes acceptance of our Terms of Service and Privacy Policy. All contents © 2000 - 2015 Web Doodle, LLC. All rights reserved.