Humans often consume power resources while obtaining clean water sources, but what if they can generate electricity without wasting it? Can power plants also change from "water users" to "producers"? The British "Nature Communications" magazine published a new engineering breakthrough on the 9th: a solar device that can generate electricity while purifying water is available. The device is expected to alleviate the shortage of energy and clean water in arid and semi-arid areas. The increasing global demand for energy and clean water sources poses certain challenges to sustainable development. Electricity production sometimes requires large amounts of water, and water purification plants in turn consume power resources. As a sustainable and renewable energy source, sunlight can simultaneously supply energy to solar cells and water purification devices. However, the energy and cost efficiency of these two technologies have been limited. This time, the research team of King Abdullah University of Science and Technology in Saudi Arabia has developed a new device that combines the two existing solar driving technologies-photovoltaic and multi-stage membrane distillation, which can produce electricity and clean water at the same time. . Membrane distillation is an advanced solar-powered system that requires relatively low temperatures to complete distillation and fresh water collection. The research team designed a three-stage membrane distillation module, fixed it on the back of the photovoltaic panel, and used the heat emitted by the photovoltaic panel for distillation. It is worth mentioning that the efficiency of the entire device is comparable to that of a commercial solar cell, and the output of purified water exceeds that of most existing devices. Researchers say that combining two functions in one device can improve energy efficiency. They believe that the latest device will enable power plants to change from "water users" to "producers" of clean water, and is expected to reuse wastewater in areas with sufficient solar radiation and fresh water scarcity. (Reporter Zhang Mengran)
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In the future, the simulation diagram of the photovoltaic power plant can produce fresh water in addition to power generation. Image source: "Nature" website 
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