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Improve Energy Storage Efficiency Method

Author: Source: Datetime: 2016-11-06 10:36:40
UFO-3500W-solar-power-generator-systemSolar energy is an inexhaustible source of clean energy, but to take full advantage of solar energy, need to address how to save solar energy at a lower cost for use at any time the key issue. A team at Stanford University reported on Oct. 31 that they have improved the method of storing solar energy by decomposing water molecules, making the energy storage efficiency of this method 30%, which is the most efficient in the same method at present.

The scientific principles involved in this approach are not complicated: solar powered portable generator cells are first used to decompose water molecules into oxygen and hydrogen, and then, if necessary, to release the chemical energy stored in the process, by recombining the resulting oxygen and hydrogen Generating water, or combustion of hydrogen in an internal combustion engine.

The principle of energy storage has long been proposed, but how to make it a highly efficient industrial process is a problem. Stanford University, an interdisciplinary team in the British "Nature" magazine published a paper that they made three improvements to the above method. First, they use a three-junction solar cell is different from conventional silicon-based solar cells. The solar cell by the three kinds of unusual semiconductor materials, can in turn absorb sunlight in the blue, green and red light, the sun's light energy into electrical energy efficiency increased to 39%, while the conventional silicon-based solar power batteries cells Of the photoelectric conversion efficiency of only about 20%.

Second, the researchers focused on improving the decomposition of water molecules for the catalyst, a substantial increase in the catalytic efficiency. In addition, they combined two identical electrolysis units to react simultaneously to produce twice as much hydrogen, a process that had previously been carried out with only one electrolyzer. Experiments show that the improved method of energy storage efficiency of 30%, more than 24.4% of the industry's highest similar methods.

"This is a step closer to developing the energy-storage technology that separates water molecules into practical, sustainable industrial processes," says Thomas Jaramillo, an associate professor of chemical engineering and photonics at Stanford University. "The next step is to continue researching how Achieving similar energy storage efficiencies with lower cost materials and devices.
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