As petrol prices continue to soar to record highs, motorists are crying out for a cheaper alternative.
Scientists at the US Department of Energy’s Argonne National Laboratory are answering that call by working to chemically manipulate algae for production of the next generation of renewable fuels – hydrogen.
‘We believe there is a fundamental advantage in looking at the production of hydrogen by photosynthesis as a renewable fuel,’ senior chemist David Tiede said. ‘Right now, ethanol is being produced from corn, but generating ethanol from corn is a thermodynamically much more inefficient process.’
Some varieties of algae, a kind of unicellular plant, contain an enzyme called hydrogenase that can create small amounts of hydrogen gas. Tiede and his group are trying to find a way to take the part of the enzyme that creates the gas and introduce it into the photosynthesis process. The result would be the production of a large amount of hydrogen gas, possibly on par with the amount of oxygen created.
‘Biology can do it, but it’s making it do it at 5-10 percent yield that’s the problem,’ Tiede said.
Algae has several benefits over corn in fuel production. It can be grown in a closed system almost anywhere including deserts or even rooftops, and there is no competition for food or fertile soil. Algae is also easier to harvest because it has no roots or fruit and grows dispersed in water.
‘If you have terrestrial plants like corn, you are restricted to where you could grow them,’ Tiede said. ‘Algae provides an alternative, which can be grown in a closed photobioreactor analogous to a microbial fermentor that you could move any place.’
Tiede admitted the research is its beginning phases, but he is confident in his team and their research goals.