Nature World: Besides the direct transformation of sunlight into electricity, solar energy can also be used to drive reactions to create chemical fuels, such as hydrogen, which can be used for transportation. Typically, the cost of producing sun-capturing semiconductors and catalysts, which are used to make the fuel, is prohibitively expensive. However, in a new study, researchers from University of Wisconsin Madison were able to drastically cut the cost of producing alternative fuels from the Sun. "In order...