Scientists recreate plants’ energy-capturing ability in artificial photosynthesis
Photosynthesis refers to the process by which plants convert sunlight into usable energy. The process not only produces energy, but also cleans out the atmosphere by releasing oxygen.
Now, researchers from the Julius-Maximilians-Universität (JMU) Würzburg in Germany and Yonsei University in Korea have artificially mimicked a portion of the photosynthesis process.
Artificial photosynthesis can harness nature’s approach to energy conversion and improve it for human needs, such as addressing environmental challenges.
How photosynthesis works
In simple terms, plants take carbon dioxide from the air and water from the soil. Using sunlight and chlorophyll, which is the green pigment in plant cells, these ingredients are transformed into sugar molecules, which is their food, and oxygen, which is released into the atmosphere.
With multiple layers of complexity, it is a process defined by a series of advanced steps.
The first step involves capturing sunlight using chlorophyll, which acts like solar panels inside plant cells. When sunlight hits these chlorophyll molecules, the electrons in the molecules gain energy or become energized.
With this extra energy, the electrons leave the chlorophyll molecule and begin moving through the plant’s machinery.
To replace these energized electrons, electrons from water molecules are pulled. This splits water molecules into oxygen, which is released into the air, and hydrogen components.
The electrons produced from sunlight are then used to convert the carbon dioxide from the air to sugar molecules—their primary food source.
Recreating the first step
The researchers mimicked the first step of the process—energizing electrons and their subsequent transport.
A stack of four artificial dye molecules was synthesized from perylene bisimide, a synthetic dye compound. These molecules, with their impressive stability under light exposure, high absorption capabilities, and strong electron affinity, make them an ideal choice for this purpose.
The four dye molecules are stacked to be structurally similar to the photosynthetic setup in plants. This means that light hitting the structure at one end triggers the process of electron energization and separation.
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