On November 29th, British researchers announced that they had made breakthroughs in the research of bio-based solar cells. They used cyanobacteria as ink and printed it on conductive carbon nanotubes just like ordinary printing to make a kind of biological solar panel. This kind of biological solar panel can generate electricity during the day and night at the same time, eliminating the dependence of traditional solar cells on sunlight.

This device is biodegradable and can be used as an ideal disposable solar cell.

Marin Sawa of Imperial College said: “The cheap, accessible, environmentally friendly, biodegradable batteries without any heavy metals and plastics, all of these characteristics are what we and our environment need, and our research shows that this technology It can be achieved completely."

Cyanobacteria are important organisms for all inhabitants of the earth, including our own human beings. They are photosynthetic organisms that have lived on Earth for billions of years. Two and a half million years ago, organisms had to rely on sulfate for the energy they needed. However, during the major oxidation events, oxygen became an important component of the Earth's atmosphere for the first time, indicating that cyanobacteria have begun to use sunlight, water, and carbon dioxide to make sugar and oxygen. (Netease editor's note: The major oxidation event refers to an incident in which the free oxygen content in the atmosphere suddenly increased about 2.6 billion years ago, and the specific reason has not yet been ascertained)

Sawa and colleagues have now shown that cyanobacteria can be used as an ink and print it onto conductive carbon nanotubes using an ordinary inkjet printer. These carbon nanotubes can be inkjet printed again on a piece of paper to etch a simple battery. These bacteria can survive these processes and continue to supply 100 hours of electrical energy during the day and night cycle.

However, they do not generate much electricity. The nine connected solar cells can power digital clocks or LED flashes. But it is enough to get some applications, such as disposable environmental sensors dressed as wallpapers, or paper sensors for monitoring diabetic patients.

Bio-based solar cell technology that uses cyanobacteria or algae to convert light into electricity has not really been used. Cost, low output, and short life are obstacles preventing this technology from reaching large-scale industrial applications. However, British researchers claim that the inkjet printing method they invented has already demonstrated the potential for large-scale application of this technology.

Research co-author Dr. Andrea Fantuzzi, School of Life Sciences, Imperial College, London, said: “Paper solar cell technology is not intended to replace traditional solar cell technology in the large-scale power generation industry, but can be used as a method that can handle both Biodegradable power supplies are also available. Their low output means that they are better suited to environments with lower energy requirements, such as environmental sensors and biosensors."

Current paper bio-based solar cells are only palm-sized. The next research team will conduct proof of concept on A4 sized paper to determine the ability to achieve a larger scale of power output.

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