• 3 minutes This Battery Uses Up CO2 to Create Energy
  • 5 minutes Shale Oil Fiasco
  • 9 minutes Don't sneeze. Coronavirus is a threat to oil markets and global economies
  • 12 minutes Historian Slams Greta. I Don't See Her in Beijing or Delhi.
  • 8 hours Boris Johnson taken decision about 5G Huawei ban by delay (fait accompli method)
  • 6 hours Demand for Diesel vs. Oil
  • 33 mins China gets caught?
  • 2 days Governments that wasted massive windfalls
  • 19 hours Which type of Hegemony will China follow
  • 11 hours Yesterday POLEXIT started (Poles do not want to leave EU, but Poland made the decisive step towards becoming dictatorship, in breach of accession treaty)
  • 2 days Here is Why People Lose Money Trading Natural Gas
  • 2 days We're freezing! Isn't it great? The carbon tax must be working!
  • 12 hours Environmentalists demand oil and gas companies *IN THE USA AND CANADA* reduce emissions to address climate change
  • 1 day Tesla Will ‘Disappear’ Or ‘Lose 80%’ Of Its Value
  • 2 days Let’s take a Historical walk around the Rig
  • 2 days US Shale: Technology

Breaking News:

Oil Prices Rise On Surprise Crude Draw

Alt Text

Tesla Starts Price War In Solar Panel Market

Tesla will cut the prices…

Alt Text

Brand New Material Could Lead To Cheaper Solar Cells

New scientific research into organic…

Brian Westenhaus

Brian Westenhaus

Brian is the editor of the popular energy technology site New Energy and Fuel. The site’s mission is to inform, stimulate, amuse and abuse the…

More Info

Premium Content

Captured CO2 to be Used as a New Fuel Source Using Solar Power

George Washington University’s Dr. Stuart Licht and colleagues have published the first experimental evidence of their new solar thermal electrochemical photovoltaic (STEP) process, which combines electrical and chemical pathways to convert CO2 to carbon or to carbon monoxide for subsequent use in synthesizing a range of industrially relevant products including hydrocarbon fuels.

According to the research team the STEP process is fundamentally capable of converting more solar energy than either photovoltaic or solar thermal processes working alone.
The STEP process uses a high temperature solar powered electrolysis cell to capture CO2 in a single step. Solar thermal energy decreases the energy required for the endothermic conversion of carbon dioxide and kinetically facilitates electrochemical reduction.  Meanwhile visible light solar energy generates the electric charge to drive the electrolysis.

STEP Process
STEP Process Block Diagram.

For the experiment, the team used a concentrator solar cell to generate 2.7 volts at a maximum power point, with solar to electrical energy efficiencies of 35% under 50 suns illumination, and 37% under 500 suns illumination. The 2.7 V is used to drive two molten electrolysis cells in series at 750 °C and three in series at 950 °C.
At 950 °C running at 0.9 V, the electrolysis cells generate carbon monoxide at 1.3-1.5 amps, and at 750 °C at 1.35 V generate solid carbon formation at similar amps.

Solid Carbon
Step Process Forms Solid Carbon.

The George Washington team also was thoughtful enough that the supporting information published along with the paper details the methodology and the materials used in the experiment.

Of great note and acclaim the research team addresses the questions of material resources, saying, “are sufficient to expand to process to substantially impact (decrease) atmospheric levels of carbon dioxide.”  This perspective is rarely observed in research papers and the inclusion by the George Washington team deserves notation and gratitude.  The information gives the research depth of understanding and better chances of improvement.

The key materials issues raised: “A related resource question is whether there is sufficient lithium carbonate, as an electrolyte of choice for the STEP carbon capture process, to decrease atmospheric levels of carbon dioxide. 700 km2 of CPV plant will generate 5×10^13 Amps of electrolysis current, and require ~2 million metric tonnes of lithium carbonate, as calculated from a 2 kg/l density of lithium carbonate, and assuming that improved, rather than flat, morphology electrodes will operate at 5 A/cm2 (1,000 km2) in a cell of 1 mm thick. Thicker, or lower current density, cells will require proportionally more lithium carbonate. Fifty, rather than ten, years to return the atmosphere to pre-industrial carbon dioxide levels will require proportionally less lithium carbonate. These values are viable within the current production of lithium carbonate. Lithium carbonate availability as a global resource has been under recent scrutiny to meet the growing lithium battery market. It has been estimated that the current global annual production of 0.13 million tonnes of LCE (lithium carbonate equivalents) will increase to 0.24 million tonnes by 2015.SI-1 Potassium carbonate is substantially more available, but as noted in the main portion of the paper can require higher carbon capture electrolysis potentials than lithium carbonate.”

Effectively, should the process be brought on line, 700 square kilometers (270 square miles) of this system would extract the “excess atmospheric CO2” within ten years.  If those numbers were accurate an area less than 17 x 17 miles would mop up the “excess” carbon dioxide in the atmosphere.  This is a stretch for reasoning, but the numbers work.

Also there is a platinum matter to consider if the design went to solid carbon capture, but the platinum would be recycled endlessly.

The team is also looking at STEP to generate synthetic jet fuel and synthetic diesel.  That would get some of the carbon cycling.

The team is working at refinement and scaling of STEP for carbon capture.

Without needing a huge source of production energy by using solar the main problem – the energy needed to drive the heating and electrolysis could pretty much be resolved.

There are gaps in the explanation available in the supporting information.  Of primary concern is the concentration level of the CO2 entering the process.  It’s not clear how pure the CO2 would have to be.  Just running air through is one thing, a concentration step to unspecified purity is quite another.

Yet the George Washington team is on to a system with great potential.  The external energy production not needed is very significant; the potential for fuel production or sequestration, depending on one’s political views cannot be overlooked.

Solar powered CO2 to new fuel sources just got much closer.

By. Brian Westenhaus of NewEnergyandFuel.com

Source: Catching CO² to Make Some Useful Fuel




Download The Free Oilprice App Today

Back to homepage




Leave a comment
  • Anonymous on September 22 2010 said:
    that is great to convert carbon dioxide into a useful product

Leave a comment




Oilprice - The No. 1 Source for Oil & Energy News
Download on the App Store Get it on Google Play