Navigation Links
Purple sunlight eaters
Date:7/19/2013

ARGONNE, Ill. A protein found in the membranes of ancient microorganisms that live in desert salt flats could offer a new way of using sunlight to generate environmentally friendly hydrogen fuel, according to a new study by researchers at the U.S. Department of Energy's Argonne National Laboratory.

Argonne nanoscientist Elena Rozhkova and her colleagues combined a pigment called bacteriorhodopsin with semiconducting nanoparticles to create a system that uses light to spark a catalytic process that creates hydrogen fuel.

Scientists have been aware of the potential of titanium dioxide nanoparticles for light-based reactions since the early 1970s, when Japanese researchers discovered that a titanium dioxide electrode exposed to bright ultraviolet light could split water molecules in a phenomenon that came to be known as the Honda-Fujishima effect. Since then, scientists have made continuous efforts to extend the light reactivity of titanium dioxide photocatalysts into the visible part of the spectrum. The promise of these photocatalysts prompted scientists to experiment with different modifications to their basic chemistry in hope of making the reaction more efficient, Rozhkova said.

"Titanium dioxide alone reacts with ultraviolet light, but not with visible light, so we used biological photoreactive molecules as a building block to create a hybrid system that could use visible light efficiently," Rozhkova said.

Rozhkova and her colleagues turned to bacteriorhodopsin which is responsible for the unusual purple color of a number of salt flats in California and Nevada because it uses sunlight as an energy source that allows it to act as a "proton pump." Proton pumps are proteins that typically straddle a cellular membrane and transfer protons from inside the cell to the extracellular space.

In the Argonne system, the protons provided by the bacteriorhodopsin are combined with free electrons at small platinum sites interspersed in the titanium dioxide matrix. "The platinum nanoparticles are essential for creating a distinct spot for the production of the hydrogen molecule," said Peng Wang, an Argonne postdoctoral researcher in Rozhkova's group at Argonne's Center for Nanoscale Materials.

"It is interesting that in biology, bacteriorhodopsin does not naturally participate in these kind of reactions," Rozhkova said. "Its natural function really doesn't have much to do at all with creating hydrogen. But as part of this hybrid, it helps make hydrogen under white light and at environmentally friendly conditions."

This bio-assisted hybrid photocatalyst outperforms many other similar systems in hydrogen generation and could be a good candidate for fabrication of green energy devices that consume virtually infinite sources salt water and sunlight.


'/>"/>

Contact: Jared Sagoff
jsagoff@anl.gov
630-252-5549
DOE/Argonne National Laboratory
Source:Eurekalert

Related biology news :

1. Purple corn compound may aid in developing future treatments for Type 2 diabetes, kidney disease
2. How the purple and pink sunscreens of reef corals work
3. High-nutrition and disease-resistant purple and yellow-fleshed potato clones obtained
4. Eddies, not sunlight, spur annual bloom of tiny plants in North Atlantic
5. Cleaning with sunlight
6. Engineered bacteria make fuel from sunlight
7. Painting with catalysts: Nano-engineered materials for detoxifying water by use of sunlight
8. Researchers say sunlight yields more efficient carbon dioxide to methanol model
9. Commonly used pesticide turns honey bees into picky eaters
10. Eat your vegetables! New book redefines how to raise healthy eaters
11. Cooperators can coexist with cheaters, as long as there is room to grow
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/13/2016)... physicians supporting Medicaid patients in Central Florida ... telehealth thanks to a new partnership with higi.   ... can routinely track key health measurements, such as blood ... they opt in, share them with IMPOWER clinicians through ... location at no cost. By leveraging this data, IMPOWER ...
(Date:3/31/2016)... , March 31, 2016  Genomics firm Nabsys ... founding CEO, Barrett Bready , M.D., who returned ... of the original technical leadership team, including Chief Technology ... of Product Development, Steve Nurnberg and Vice President of ... to the company. Dr. Bready served as ...
(Date:3/23/2016)... , March 23, 2016 ... erhöhter Sicherheit Gesichts- und Stimmerkennung mit Passwörtern ... (NASDAQ: MESG ), ein führender ... das Unternehmen mit SpeechPro zusammenarbeitet, um erstmals ... Finanzdienstleistungsbranche, wird die Möglichkeit angeboten, im Rahmen ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... , June 23, 2016 /PRNewswire/ - FACIT ... Ontario biotechnology company, Propellon Therapeutics ... development and commercialization of a portfolio of first-in-class ... Epigenetic targets such as WDR5 represent an exciting ... significantly in precision medicine for cancer patients. Substantial ...
(Date:6/23/2016)... YORK , June, 23, 2016  The Biodesign ... to envision new ways to harness living systems and ... Modern Art (MoMA) in New York City ... than 130 participating students, showcased projects at MoMA,s Celeste ... Paola Antonelli , MoMA,s senior curator of architecture ...
(Date:6/23/2016)... June 23, 2016 Apellis Pharmaceuticals, Inc. ... clinical trials of its complement C3 inhibitor, APL-2. ... multiple ascending dose studies designed to assess the ... subcutaneous injection in healthy adult volunteers. ... as a single dose (ranging from 45 to ...
(Date:6/23/2016)... (PRWEB) , ... June 23, 2016 , ... ... on quality, regulatory and technical consulting, provides a free webinar on ... on July 13, 2016 at 12pm CT at no charge. , Incomplete investigations ...
Breaking Biology Technology: