The comparison of blue skies and grey days shows the negative impact of burning fossil energy on the environment, and the huge difference in carbon dioxide (CO2) concentration between the two provides an untapped energy source for electricity generation. Recently, a team of Pennsylvania State University developed a device that uses the difference in carbon dioxide emissions from fossil-fueled power plants and the concentration of carbon dioxide in the ambient air to charge the battery. Related research was published in the latest issue of the United States "Environmental Science and Technology" magazine.
The device is called a “flow unit†and works on the principle of dissolving carbon dioxide emissions in an aqueous solution and using the concentration difference between carbon dioxide in the ambient air to generate electricity. It produced an average power density of 0.82 watts per square meter, which is nearly 200 times higher than the value obtained from a similar method.
Researcher Christopher Gorski explained that this work provides a simpler way to capture carbon dioxide as an energy source for emissions, while the existing technology is to convert the carbon dioxide into expensive catalysts and high temperature conditions. Useful fuel for energy.
To take advantage of this potential difference, the researchers first dissolved the carbon dioxide gas and the surrounding air in an aqueous solution container, a process known as spraying. In this process, the carbon dioxide spray solution forms bicarbonate ions and thus has a lower pH. Afterwards, the researchers injected the two solutions into the two channels of the “flow unitâ€, resulting in a pH gradient, while the two channels placed opposite electrodes with semi-porous membranes between the channels to prevent instant mixing of the gases while allowing the ions to pass through. . The difference in pH between the two solutions allows various ions to pass through the membrane, causing a voltage difference between the two electrodes, causing electrons to flow along the wires connecting the electrodes. When the “flow unit†is discharged, the channel can be opened to let the liquid flow recharge.
The researchers said that further improvement of the results may have great promise in the future. (Reporter Hualing)
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