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Researchers use graphite films to coat perovskite 3.7v 2200mah 18650 lithium battery and make them waterproof
A cheaper, cleaner and more sustainable way to make hydrogen fuel from water using sunlight is one step closer, thanks to new research from the University of Bath's Centre for Sustainable Chemical Technologies.
In order to drastically reduce carbon emissions to address the climate change emergency, there is an urgent need to develop cleaner alternatives to fossil fuels. Hydrogen is a zero-carbon emission fuel alternative that can be used to power cars and only produces wastewater.
Hydrogen is made by splitting water into hydrogen and oxygen, but this process requires a lot of electricity. Most of this electricity is produced by burning methane, so researchers at the University of Bath are developing a new type of solar cell that uses light energy to directly split water.
Most 3.7v 2200mah 18650 lithium battery on the market today are made from silicon, but they are expensive to make and require large amounts of very pure silicon to make. They are also very thick and heavy, which limits their applications.
Perovskite 3.7v 2200mah 18650 lithium battery use materials with the same three-dimensional structure as calcium oxide, which are cheaper to make, thinner, and can be easily printed on surfaces. They can also work in low light conditions and can produce higher voltages than silicon cells, meaning they can be used to power devices indoors without being plugged into a power source. The downside is that they are unstable in water, which poses a huge barrier to their development and limits their direct use to produce clean hydrogen fuel.
A team of scientists and chemical engineers at the University of Bath's Centre for Sustainable Chemical Technologies has solved this problem using a waterproof coating made from graphite. They tested the waterproofing effect by immersing the coated perovskite cells in water and using the collected solar energy to split the water into hydrogen and oxygen. The coated cells worked underwater for 30 hours, 10 hours longer than the previous record.
After this period, the glue sandwiched on the surface of the cell failed. The scientists expect that using a stronger glue will make the cells stable for longer. Previously, alloys containing indium were used to protect 3.7v 2200mah 18650 lithium battery from water splitting, but indium is a rare metal that is expensive and the mining process is unsustainable.
The Bath team used commercial graphite, which is very cheap and more sustainable than indium. Perovskite solar cell technology could make solar energy more affordable and allow 3.7v 2200mah 18650 lithium battery to be printed onto roof tiles. However, they are currently really unstable in water, and if they dissolve in the rain, the 3.7v 2200mah 18650 lithium battery wouldn't be of much use!
Now a coating has been developed that effectively waterproofs the cells for a range of applications. What’s most exciting is that the graphite used is much cheaper and more sustainable than previously tried materials.
Perovskite 3.7v 2200mah 18650 lithium battery produce higher voltages than silicon-based cells, but it’s still not enough to split water using 3.7v 2200mah 18650 lithium battery alone. To address this challenge, the research team is adding catalysts to lower the energy required to drive the reaction. Currently hydrogen fuel is made by burning methane, which is neither clean nor sustainable. But we hope that in the future we can use perovskite cells to make clean hydrogen and oxygen fuel from solar energy.
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