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Solar panels light the way from carbon dioxide to fuel

Date:
July 1, 2014
Source:
Princeton University
Summary:
Researchers have devised an efficient method for harnessing sunlight to convert carbon dioxide into a potential alternative fuel known as formic acid. The transformation from carbon dioxide and water to formic acid was powered by a commercial solar panel.

Pictured with the photovoltaic-electrochemical cell system from left to right: Graduate student James White (Princeton), Professor Andrew Bocarsly (Princeton and Liquid Light) and principal engineer Paul Majsztrik (Liquid Light).
Credit: Photo by Frank Wojciechowski

Research to curb global warming caused by rising levels of atmospheric greenhouse gases, such as carbon dioxide, usually involves three areas: Developing alternative energy sources, capturing and storing greenhouse gases, and repurposing excess greenhouse gases. Drawing on two of these approaches, researchers in the laboratory of Andrew Bocarsly, a Princeton professor of chemistry, collaborated with start-up company Liquid Light Inc. of Monmouth Junction, N.J. to devise an efficient method for harnessing sunlight to convert carbon dioxide into a potential alternative fuel known as formic acid. The study was published June 13 in the Journal of CO2 Utilization.

The transformation from carbon dioxide and water to formic acid was powered by a commercial solar panel generously provided by the energy company PSE&G that can be found atop electric poles across the state. The process takes place inside an electrochemical cell, which consists of metal plates the size of rectangular lunch-boxes that enclose liquid-carrying channels.

To maximize the efficiency of the system, the amount of power produced by the solar panel must match the amount of power the electrochemical cell can handle, said Bocarsly. This optimization process is called impedance matching. By stacking three electrochemical cells together, the research team was able to reach almost 2 percent energy efficiency, which is twice the efficiency of natural photosynthesis. It is also the best energy efficiency reported to date using a human-made device.

A number of energy companies are interested in storing solar energy as formic acid in fuel cells. Additionally, formate salt -- readily made from formic acid -- is the preferred de-icing agent on airplane runways because it is less corrosive to planes and safer for the environment than chloride salts. With increased availability, formate salts could supplant more harmful salts in widespread use.

Using waste carbon dioxide and easily obtained machined parts, this approach offers a promising route to a renewable fuel, Bocarsly said.


Story Source:

The above story is based on materials provided by Princeton University. The original article was written by Tien Nguyen. Note: Materials may be edited for content and length.


Journal Reference:

  1. James L. White, Jake T. Herb, Jerry J. Kaczur, Paul W. Majsztrik, Andrew B. Bocarsly. Photons to formate: Efficient electrochemical solar energy conversion via reduction of carbon dioxide. Journal of CO2 Utilization, 2014; 7: 1 DOI: 10.1016/j.jcou.2014.05.002

Cite This Page:

Princeton University. "Solar panels light the way from carbon dioxide to fuel." ScienceDaily. ScienceDaily, 1 July 2014. <www.sciencedaily.com/releases/2014/07/140701170158.htm>.
Princeton University. (2014, July 1). Solar panels light the way from carbon dioxide to fuel. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2014/07/140701170158.htm
Princeton University. "Solar panels light the way from carbon dioxide to fuel." ScienceDaily. www.sciencedaily.com/releases/2014/07/140701170158.htm (accessed July 31, 2014).

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