Navigation Links
Nanostructure boosts efficiency in energy transport
Date:3/3/2009

CHESTNUT HILL, MA (March 3, 2009) Overcoming a critical conductivity challenge to clean energy technologies, Boston College researchers have developed a titanium nanostructure that provides an expanded surface area and demonstrates significantly greater efficiency in the transport of electrons.

The challenge has vexed researchers pursuing solar panels thick enough to absorb sunlight, yet thin enough to collect and transport electrons with minimal energy loss. Similarly, the relatively new science of water splitting requires capturing energy within semiconductor materials and then efficiently transporting charges ultimately used to generate hydrogen.

Boston College Asst. Prof of Chemistry Dunwei Wang and members of his lab found that incorporating two titanium-based semiconductors into a nano-scale structure improved the efficiency of power-collecting efforts by approximately 33 percent, the team reported in the online edition of the Journal of the American Chemical Society.

The team achieved a peak conversion efficiency of 16.7 percent under ultraviolet light, reported Wang and his co-authors, BC graduate students Yongjing Lin and Sa Zhou, post doctoral researcher Xiaohua Liu and undergraduate Stafford Sheehan. That compared to an efficiency of 12 percent from a structure composed only of titanium dioxide (TiO2).

Wang said the efficiency gains within the novel material can serve so-called water-splitting, where semiconductor catalysts have been shown to separate and store hydrogen and oxygen gases.

"The current challenge in splitting water involves how best to capture photons within the semiconductor material and then grab and transport them to produce hydrogen," Wang says. "For practical water splitting, you want to generate oxygen and hydrogen separately. For this, good electrical conductivity is of great importance because it allows you to collect electrons in the oxygen-generation region and transport them to the hydrogen-generation chamber for hydrogen production."

By using two crystalline semiconductors materials critical to the processes of energy capture and transport Wang says the researchers discovered a new and successful transfer mechanism in an engineered structure nearly invisible to the human eye.

Titanium dioxide has played a key role in early water-splitting research because of its prowess as a catalyst. However, its light absorption is confined to ultraviolet rays only and the material is also a relatively poor conductor.

Wang and his researchers started by growing a nanostructure made of titanium disilicide (TiSi2), a semiconductor capable of absorbing solar light and a material able to provide a sturdy structure with expanded surface area critical to absorbing photons. Still in need of its catalytic capabilities, titanium dioxide was used to coat the structure, Wang said.

The resulting net-like nanostructure effectively separated charges, collecting the electrons in the titanium disilicide core and transporting them away. The structure transferred positive charges to the titanium dioxide region of the material for chemical reactions. In water-splitting, these charges could potentially be used to generate hydrogen.


'/>"/>

Contact: Ed Hayward
ed.hayward@bc.edu
617-552-4826
Boston College
Source:Eurekalert  

Related biology technology :

1. Two nanostructures are better than one
2. NIST team develops novel method for nanostructured polymer thin films
3. Smart insulin nanostructures pass feasibility test, UT study reports
4. New nanostructured thin film shows promise for efficient solar energy conversion
5. UC San Diego nanostructures will raise thin-film solar cell efficiency
6. In novel playground, metals are formed into porous nanostructures
7. New process creates 3-D nanostructures with magnetic materials
8. Murad Boosts Skin Immunity With the New Murad(R) Professional Line
9. New Scandinavian collaboration boosts nanotech development
10. Cystic Fibrosis: License Agreement Boosts Development of Therapy Against Lung Infections
11. Genzyme Boosts Quality Using Dyadem Quality Lifecycle Management
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Nanostructure boosts efficiency in energy transport
(Date:10/9/2017)... , ... October 09, 2017 ... ... on October 5, 2017, in the medical journal, Epilepsia, Brain Sentinel’s SPEAC® ... gold standard, video EEG, in detecting generalized tonic-clonic seizures (GTCS) using surface ...
(Date:10/7/2017)... ... October 06, 2017 , ... ... genomic technologies, launched its ProxiMeta™ Hi-C metagenome deconvolution product, featuring the first ... accompanying cloud-based bioinformatics software to perform Hi-C metagenome deconvolution using their own ...
(Date:10/6/2017)... Boston, Mass. (PRWEB) , ... October 06, 2017 ... ... spotlight female entrepreneurship within the healthcare and technology sector at their fourth annual ... six panels featuring 30 inspiring speakers and the ELEVATE pitch competition showcasing early ...
(Date:10/5/2017)... ... , ... LabRoots , the leading provider of educational and interactive virtual ... to cancer research with a month-long promotion supporting the advancement of breast cancer research ... use promo code PinkRibbon to get 10 percent off their purchase of every the ...
Breaking Biology Technology:
(Date:4/11/2017)... BEACH GARDENS, Fla. , April 11, 2017 ... identity management and secure authentication solutions, today announced ... contract by Intelligence Advanced Research Projects Activity (IARPA) ... for IARPA,s Thor program. "Innovation has ... onset and IARPA,s Thor program will allow us ...
(Date:4/11/2017)... 2017 No two people are believed ... New York University Tandon School of Engineering and ... that partial similarities between prints are common enough ... phones and other electronic devices can be more ... lies in the fact that fingerprint-based authentication systems ...
(Date:4/6/2017)... , April 6, 2017 ... RFID, ANPR, Document Readers, by End-Use (Transportation & Logistics, ... Facility, Oil, Gas & Fossil Generation Facility, Nuclear Power), ... Educational, Other) Are you looking for a ... sector? ...
Breaking Biology News(10 mins):