Tuesday, January 26, 2016 11:46:45 PM
It's been a few months since I was last on here. I pop in just to see what's happening.
When I got the latest newsletter I had two thoughts. The first one - oh cool, they achieved something that was on their to do list. The other was - oh great a fluff piece again. However as a former long I know better; they are once again being very vague and while it may be true that they are making progress they are also trying to stretch out the patience of shareholders. If I'm not mistaking that was the philosophy behind being publicly traded. It was to get additional funding from private hands and not purely be reliant on grants and the like. I need to see some positive change in their modus operandi to bring back, a least a portion of, my position from SLTD.
I still believe a direct solar to hydrogen conversion process and fuel cells are the way to go. However, over the past year there have been more and more what seems like intellectual threats/competition in this arena. This can be worth a lot of money, but at the current valuation and share structure its difficult to justify getting back in. Especially since more dilution is very possible. I'm still waiting though... just need a clearer sign or a better price.
I digress, the real reason I bothered logging in was to share an article.
http://www.nanowerk.com/news2/green/newsid=42427.php
Posted: Jan 25, 2016
Sophisticated enzyme-mimic enables efficient hydrogen production
(Nanowerk News) Researchers from the University of Amsterdam's Van 't Hoff Institute for Molecular Sciences (HIMS) have developed a new catalyst that paves the way for low-cost, large-scale hydrogen-production. The researchers, led by Professor Joost Reek, recently presented their enzyme-mimicking catalyst in Sciences Advances ("An iron-iron hydrogenase mimic with appended electron reservoir for efficient proton reduction in aqueous media").
A hydrogen-based sustainable economy depends on technology to generate molecular hydrogen using sustainable solar or wind energy. Catalytic chemistry already enables this by using water as feedstock and platinum and iridium as active materials. However, because such elements are scarce and expensive this technology cannot be applied at the required global scale.
Looking at nature
To overcome this hurdle, chemists have started looking toward nature where so-called iron-iron hydrogenase enzymes catalyse the conversion (reduction) of protons to molecular hydrogen with a performance comparable to platinum. It is a major challenge to apply these enzymes directly in hydrogen-producing devices since their isolation is difficult and their performance in air poor. Nevertheless, their high efficiency has spurred the search for comparable iron-based molecular complexes that also can produce hydrogen with a platinum-like performance.
Over the last decade, numerous synthetic complexes have been prepared that structurally and functionally mimic the active site of hydrogenase enzymes. Most of these 'synthetic hydrogenases' show serious drawbacks such as a low efficiency and stability and the requirement of organic solvents. Hydrogenase-mimics that perform efficiently in an aqueous environment while being tolerant to air have until now not been reported.
Characteristic feature
In the current edition of Science Advances, the researchers offer a possible solution by presenting a new oxygen-tolerant iron-iron hydrogenase-mimic that not only achieves efficient proton reduction in aqueous media but also displays electron storage and pre-organisation in close proximity to the active site - a feature characteristic of working natural enzymes.
The Amsterdam-designed synthetic hydrogenase contains a redox-active phosphorous ligand that acts as an electron reservoir and actively partakes in the reduction of protons. It donates an electron to the active site during the catalytic cycle when needed. As a result, the catalyst displays high turnover numbers (TON) and turnover frequencies (TOF).
Combining this high performance with the operation in aqueous media and the tolerance towards oxygen, this new hydrogenase-mimic is a major step toward the development of catalysts for inexpensive large-scale hydrogen-producing devices. Further development will be directed toward analogs that operate at lower overpotentials and can be efficiently implemented in devices (for example, by anchoring to electrodes or metal-organic frameworks).
Source: Universiteit van Amsterdam
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