Electricity from a beet
Chemists around the world are looking to the plant kingdom for ideas about harvesting the energy of sunlight. Plants, after all, have been making a living exploiting sunbeams for almost four billion years. And part of what plants accomplish each day creates a tiny flow of electrons—a form of electricity.
The familiar solar-electric panels on the roofs of RVs depend on pure silicon crystals, which are produced in an energy-intensive manufacturing process. The crystals are semiconductors “doped” with special impurities to make them work—impurities that are often toxic metals requiring special mining to unearth. These first-generation panels certainly work, but the electrical power we can … » More …