RESEARCH WATCH
Prasen Vinchurkar
Hydrogen generated from sunlight and ethanol
By Ben Coxworth
18:35 May 30, 2011
Hydrogen generated from sunlight and ethanol
An international team of scientists has announced success in creating hydrogen at ambient temperature and pressure using a combination of sunlight and ethanol. The team of researchers from Spain's Universitat Politècnica de Catalunya, Scotland's University of Aberdeen and New Zealand's University of Auckland say the method is potentially cheaper, produces higher yields and, because no high temperatures or pressures are required, uses less energy than conventional methods.
The process begins by placing a powdered photocatalyst and ethanol in a container, then agitating the mixture while exposing it to ultraviolet light. A titanium dioxide semiconductor within the container generates electrons when exposed to the light, and those electrons are captured by metallic gold nanoparticles in the catalyst. Those captured electrons proceed to react with the ethanol's alcohol molecules, producing hydrogen.
While the hydrogen yield depends on the amount of photocatalyst used and the size of area exposed to the light, so far the researchers have been able to produce up to 5 liters of hydrogen per kilogram of catalyst (1.32 U.S. gallons per 2.2 lbs) within in one minute. They believe that if 9 kilograms (19.84 lbs) of the catalyst were used, and the hydrogen then powered a fuel cell, 3 kW of electricity would be the result - enough, they say, to meet the needs of a typical household.
This isn't the first time that sunlight has been used to generate hydrogen. While some of those other techniques rely largely on water, the researchers claim that they also require expensive secondary materials, and that their yields haven't been as impressive. Ethanol, by contrast, is relatively inexpensive and comes from renewable plant-based sources. The photocatalyst is also said to be fairly economical, as the gold particles it contains are very small.
The team is now looking at designing reactors, that could generate hydrogen for use in providing electricity for homes.
The research was recently published in the journal Nature Chemistry.
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This sounds like a nonsense research. With all due respect to the scientists behind this study, this method of getting hydrogen from ethanol looks inefficient.
Why can't they just use ethanol as fuel? Why do they have to use extra materials just to get hydrogen? Ethanol can be used in a direct ethanol fuel cell, which does not require expensive platinuim materials like hydrogen fuel cells.
bio-power jeff
- May 31, 2011 @ 03:58 am PDT
So it looks like they are taking ethanol, which AFAIK has pretty much been shown to be a pointless source of energy (the energy output is little more than twice the energy required to produce it, and it consumes valuable farm land), and to this they add more energy in the form of sunlight to produce hydrogen.
Or am I missing something?
splatman
- May 31, 2011 @ 05:33 am PDT
Why a detour? The Efuel Microfueler makes ethanol from waste material and allows you to plug in a power generator directly to the system, giving you engine fuel and electricity without the hassle.
Knutars
- May 31, 2011 @ 05:56 am PDT
Yeah, this doesn't make sense to me either. Considering the inefficiencies of ethanol production wouldn't it be better use of that sunlight to use photovoltaic or solar-conversion?
Blixdevil
- May 31, 2011 @ 06:47 am PDT
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