Photos: Fujitsu unveils king-size fuel cell

Ever wonder how a hydrogen fuel cell works? This poster explains the process. In a nutshell, natural gas (methane, made from carbon and hydrogen) is heated with steam until it cracks. Hydrogen is harvested and then piped to a different unit with a membrane. The membrane harvests electrons from the hydrogen molecules. Carbon dioxide and water are the byproducts. The hot water from the reaction can be used to heat buildings.

Photo by Michael Kanellos/CNET News.com