Chemical solar cell to produce Hydrogen fuel from Sun
Post date: May 11, 2011 8:40:19 PM
Powering the planet with solar fuel
Cheap, abundant cathode material found for producing hydrogen fuel
Solar creates Hydrogen bubbles with catalysts
Solar Hydrogen
source: physorg.com
By replacing catalysts
made of expensive noble metals like platinum with cheaper, earth-abundant materials, researchers have taken a step toward enabling the large-scale production of hydrogen from sunlight and water. In a recent study, the researchers have demonstrated that catalysts made of molecular clusters based on molybdenum and sulphur can generate hydrogen from sunlight at rates comparable to those of platinum.
Explainer: Chemical solar cells
consist of many pillars, with the top half of each pillar made of a photoanode that absorbs the blue part of the solar spectrum, and the bottom half made of a photocathode that absorbs the red part. When blue light is absorbed, it oxidizes water into oxygen and protons. The protons migrate through a membrane in which the pillars are embedded, ending up at the photocathode. As red light is absorbed, catalysts attached to the sides of the pillars reduce the protons to hydrogen.