Tuesday, July 21, 2015

Nanowires help produce hydrogen fuel using sunlight

Source: http://www.engadget.com/2015/07/20/nanowires-help-produce-hydrogen-fuel-using-sunlight/

Toyota's hydrogen-powered Mirai at a fuel station

You ideally want to produce clean hydrogen fuel using clean sources, and Dutch researchers have taken a big step toward making that a practical reality. They've built a solar cell that uses a grid of gallium phosphide nanowires to make hydrogen gas from water. The approach gets a useful yield of about 2.9 percent in lab tests. That may not sound like much, but it's about 10 times more effective than previous techniques and uses 10,000 times less exotic material.

It's still going to take more refinements before this kind of technology is practical. Even hooking up silicon cells to a battery nets a 15 percent yield, for example. If scientists improve their methods, though, you could be driving hydrogen cars whose fuel is eco-friendly at every step, not just when it's in your vehicle.

[Image credit: AP Photo/Shizuo Kambayashi]

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Source: TUE, Nature


Tuesday, July 7, 2015

Wave generator supplies US electrical grid for the first time

Source: http://www.engadget.com/2015/07/07/wave-generator-hawaii-power-grid/

A prototype wave generator called Azura is supplying grid power to Hawaii, the first time such a feat has been officially verified, according to the US Department of Energy (DoE). Though it can only produce 20 kilowatts, the DoE said that similar devices could eventually provide large amounts of clean power to coastal cities. The project is co-sponsored by the US Navy and was developed by an Oregon-based company called Northwest Energy Innovations (NWEI). It's located at the Navy's Wave Energy Test Site in Kaneohe Bay in Oahu, at a depth of about 30 meters (100 feet).

The prototype consists of a 45-ton wave energy converter that can capture energy from both the heave (up/down) and surge (front/back) motions of waves. It has an onboard generator to convert kinetic motion to electricity, which is transferred to the grid via an undersea cable. The device first went online last month, bringing an unknown quantity of power to Hawaii's electrical grid. Researchers from the University of Hawaii recently confirmed its performance, marking the first time that US cities and homes have officially been powered, in part, by waves.

Following further tests on the current system, the NWEI and DoE plan to ramp things up considerably. They'll use the result from the current trial to design a new generator that will operate in bigger waves at 60-80 meter depths (100-150 feet) and generate up to 1 megawatt, enough energy to power several hundred homes. That system could come online as early as 2017, but meanwhile, researchers will continue testing Azura over the next year.

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Via: Network World

Source: US Department of Energy


Monday, June 22, 2015

Article: MIT Students Create A Brick That Could End Pollution From Dirty Brick Kilns

We use a lot of bricks. Making them, though, is pretty bad. The Eco BLAC brick is made with waste ash and requires no firing at all. India's brick industry, spread out over 100,000 kilns and producing up to 2 billion bricks a year, is a big source of pollution. To fire to hot temperatures, the ki...


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UCLA discovers how solar cells' charges can last for weeks

Source: http://www.engadget.com/2015/06/20/ucla-solar-cell/

30,000 Lux

Solar cells have always been inspired by photosynthesis, so it's only natural for researchers to take cues from different aspects of the energy-making process. A team of UCLA chemists, for instance, have developed a way that will allow solar cells to keep their charge for weeks instead of just a few seconds like current products are capable of. According to Sarah Tolbert, UCLA chem professor and one of the study's authors, they looked into plants' nanoscale structures that can keep negatively charged molecules separated from positively charged ones. "That separation is the key to making the process so efficient," she said.

The team has discovered that in order to mimic those nanoscale structures in plastic solar cells (which are potentially cheaper to make than silicon-based ones), they need to use two components: a polymer donor and a nano-scale fullerene acceptor. The team describes the process as follows:

The UCLA technology arranges the elements more neatly -- like small bundles of uncooked spaghetti with precisely placed meatballs (see image below). Some fullerene meatballs are designed to sit inside the spaghetti bundles, but others are forced to stay on the outside. The fullerenes inside the structure take electrons from the polymers and toss them to the outside fullerene, which can effectively keep the electrons away from the polymer for weeks.

In short, those two can form the right "noodle and meatball" structure to keep different charges away from each other for days to weeks, greatly improving a cell's capability to retain power. It's also a plus that the components can auto-assemble, simply by putting them in water. The ability to store energy is a big deal for solar energy systems, since they need to be able to save enough power to use at night or during days when the sun isn't shining as brightly. UCLA's technology isn't quite ready yet, but Tolbert and her team are already trying to figure out how to incorporate it into real solar cells.

[Image credit: Jason A. Samfield/Flickr, UCLA Chemistry]

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Source: UCLA, Science


Friday, June 5, 2015

High-yield yeast converts 97 percent of a plant's sugars to biofuel

Source: http://www.engadget.com/2015/06/04/high-yield-yeast-converts-97-percent-of-a-plant-to-biofuel

Operations At Usina da Mata Ethanol, Sugar and Energy Plant As Brazil Expands Ethanol Tax Credit

The Department of Energy's BioEnergy Science Center announced a major breakthrough in the biofuel field yesterday: a newly developed strain of yeast capable of producing more than three times the amount of fuel from plant matter as the current record holder. The Center has teamed with Mascoma LLC to develop the new strain, dubbed C5 FUEL. Existing biofuel yeast strains generally only convert about 30 percent of a plant's sugars and cannot effectively convert tough xylose sugars. C5 however can ferment up to 97 percent of plant sugars into ethanol, including the xylose that other strains can't break down. What's more, it does all that in just 48 hours as opposed to the multiple days or weeks that other strains require.

Update: The headline of this post has been updated to clarify that it's 97 percent of a plant's sugars the team is claiming to convert into biofuel, not 97 percent of the entire plant.

The BESC team presented its findings at the 31st International Fuel Ethanol Workshop in Minneapolis on Thursday morning. They hope that the discovery will help make ethanol-based biofuels more accessible to the consumer market. "Driving down the cost to develop, verify and consolidate bioprocessing was at the heart of the BESC effort when we began in 2007, and this achievement allows us to advance to the next challenge," BESC Director Paul Gilna said in a statement. "This accomplishment represents a clearly impactful example of how our partnering with industry can accelerate the translation of our research capabilities and findings into commercial products." Up next, the BESC hopes to perform the same biochemical gymnastics with thermophilic bacteria, which would produce fuel directly from biomass in just one step.

[Image Credit: Bloomberg via Getty Images (Top) - ORNL (inline)]


Saturday, May 30, 2015

Mass deaths of rare Kazakhstan antelopes stir conservation fears

Source: http://www.businessinsider.com/afp-mass-deaths-of-rare-kazakhstan-antelopes-stir-conservation-fears-2015-5

The sudden deaths of tens of thousands of endangered antelopes in ex-Soviet Kazakhstan over the past two weeks have left scientists scrambling for answers and conservationists worried about the animal's future

Astana (Kazakhstan) (AFP) - The sudden deaths of tens of thousands of endangered antelopes in ex-Soviet Kazakhstan over the past two weeks have left scientists scrambling for answers and conservationists worried about the animal's future.

Over 120,000 rare saiga antelopes -- more than a third of the total global population -- have been wiped out in a devastating blow that the United Nations Environment Programme has called "catastrophic". 

UN experts have said the mass deaths are down to "a combination of biological and environmental factors."

Scientists have struggled to put their finger on the exact nature of the disease that has felled entire herds, but say findings point towards an infectious disease caused by various bacteria.

Any infections have likely been exacerbated by recent rains that have made the antelopes -- 90 percent of which live on the steppes of Central Asian Kazakhstan -- less able to cope with diseases.

"Unseasonal wetness may have been something that lowered their immunity to infection but until we do more analysis we will not know anything for sure," Steffen Zuther of the Altyn Dala Conservation Initiative told AFP.

The rate of the deaths has staggered those who have studied the species -- whose ancestors have inhabited the region since the ice age. 

"A one hundred percent mortality for the herds affected is extraordinary," said Richard Kock, a professor at the Royal Veterinary College in London who recently returned from Kazakhstan. 

"We are dealing with creatures that have fairly low resilience." 

The sudden spate of deaths comes as a nasty shock as up until recently the saiga antelopes -- which live for between six and 10 years and are known for their protruding noses -- had been hailed as something of a conservation success.

Until mid-May, when the country's Ministry of Agriculture began reporting the deaths, saiga numbers in Kazakhstan had rallied from an estimated 20,000 in 2003 to the more than 250,000.

In 1993, there were over a million saiga antelopes, mostly concentrated in the steppe land of Kazakhstan, neighbouring Russia and Mongolia. 

The susceptibility of the population since then has raised extinction fears and the saiga is listed as critically endangered by the International Union for Conservation of Nature (IUCN).

- Decade to recover -

While herds that have not already been struck down are thought to be safe for the moment, Kazakhstan's Prime Minister Karim Massimov set up a working group including international experts Thursday to establish reasons for the deaths and oversee disinfection of lands in the three regions where the saiga died.

"If there is one positive that has come from this it is that the government has become very open to international channels of cooperation now," Kock from the Royal Veterinary College in London said.

Even then, however, scientists estimate that it will take a decade for the antelope numbers to recover from the recent deaths.

For now though they are hoping that the beasts can avoid even more potent diseases that have raged in nearby areas, such as the morbillivirus epidemic that swept across neighbouring China last year, and other threats. 

One of those is the rise in poaching for the animal's horn -- prized in Chinese medicine -- which grew widespread following the collapse of the Soviet Union but has slowed down since.

Kazakhstan extended a ban on hunting the saiga until 2021 four years ago and imposes penalties of up to five years in prison for poachers.


Thursday, April 16, 2015

These Tiny Capsules Suck Up CO2

Source: http://gizmodo.com/these-tiny-capsules-suck-up-co2-1698167277

They might look more like candy, but these micro-capsules are rather more special than that. Their shiny shell allows CO2 to pass straight through—where it can be trapped by a liquid held in their core.