Graphene makes rainy day solar power possible

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As technical advances continue to reduce the cost and increase the effectiveness of solar cells, a remaining disadvantage is that they do not produce power when it is raining. Now, researchers from the Ocean University of China, Qingdao, have used graphene to produce hundreds of solar cell microvolts from simulated rainwater. Graphene is a one-atom-thick sheet of carbon with particular conductivity. In aqueous solutions, graphene binds positively charged ions to its own electrons. Because rain contains salts as well as water, when used on a solar cell, graphene attracts the positive ions in the salts, which results in two completely…

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