Living Solar Cells: Harnessing Photosynthesis to Generate Electricity and Hydrogen

Scientists from the Technion Institute of Technology in Haifa, Israel have developed a living solar cell using an ice plant. The cell utilizes photosynthesis to produce electrons which can be used to generate electricity and create hydrogen for use in fuel cells. The cell consists of an iron anode and a platinum cathode inserted into one of the plant’s leaves, producing a voltage of 0.28 volts and a current density of 20 microamperes per square centimeter. This current can be increased by incorporating multiple leaves into the cell.

The Process of Photosynthesis

Photosynthesis is the process by which plants and other autotrophs convert light energy from the sun into chemical energy. This chemical energy is then used to produce carbohydrates like glucose, which are used for growth and development. During photosynthesis, carbon dioxide from the air is taken in and oxygen is released as a byproduct. Water is also necessary for photosynthesis to occur, as it provides electrons that are needed for the reaction. The overall equation for photosynthesis can be written as 6CO2 + 6H2O –> C6H12O6 + 6O2.
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Picture source: Ronnie George