Scientists Invent Battery Made of Paper

Scientists have developed a wateractivated, disposable, paper battery, according to a proof-of-concept study published in Scientific Reports. The developers believe that their invention could be used to power a variety of low-power, single-use electronics, such as smart packaging, environmental sensors and medical diagnostic devices, thereby reducing their environmental impact.

The single-cell battery consists of one square centimeter of paper treated with salts. One side is printed with ink containing graphite flakes, which serves as the positive terminal, and the other side is printed with ink containing zinc powder to create the negative terminal. Another layer of ink containing graphite flakes and carbon black is applied over that, linking the battery’s positive and negative ends to two wires secured by wax.

When a few drops of water are added to the paper, the salts dissolve, releasing charged ions that spread across the paper to activate the battery. In tests, researchers were able to reach a stable 1.2 volts. (The voltage of a standard AA alkaline battery is 1.5 volts.) The battery’s performance decreased significantly after an hour when the paper dried. However, after two more drops of water were added, the battery maintained 0.5 volts for an additional hour.

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In an effort to reduce its carbon footprint, Honda is experimenting with the Chlamydomonas reinhardtii class of algae they have nicknamed “Dreamo”, which can eat twice its weight in carbon dioxide in three to five days, depending on the time of year. Developers are growing Dreamo on the roof of a car factory in Tochigi, Japan, where it can absorb CO2 emissions from manufacturing. It has been genetically modified to grow hardier and five times faster than ordinary microalgae, allowing the growth solution to last months instead of weeks.

The development team is also exploring additional uses for Dreamo. After serving its pollution-fighting role, the algae can be harvested, dried and turned into food, fuel or plastic. Depending upon the amount of nitrogen applied to the algae, its cellular composition can be modified to be either predominantly carbohydrate- or protein-based. When the algae is mostly protein, an enzyme can be added to easily extract the starch to be used as food or as a raw material in animal food, cosmetics or pharmaceuticals. When the algae is mostly carbohydrate, it can be extracted as glucose and ethanol to be converted into plastic resin or jet fuel.

According to a study in The Geographical Journal led by University College London, a shift away from fossil fuels and an increase in agricultural demand will cause the demand for sulfuric acid to increase considerably from 246 to 400 million metric tons by 2040. The result is an annual supply shortfall of between 100 and 320 million metric tons, or between 40 and 130 percent of the current supply. Sulfur is a byproduct of processing crude oil and natural gas. As the world decarbonizes in response to climate change, there will be a diminished supply of both fossil fuels and sulfur. Sulfuric acid is required for the manufacture of phosphorus fertilizers used in global food production and for the extraction of rare metals from ores crucial to the transition to a green economy, such as cobalt and nickel used in batteries. Unless action is taken to reduce the need for this chemical, the study authors warn, environmentally damaging mining will be required to fill the shortfall.