Search results
Results from the WOW.Com Content Network
In addition to electricity, fuel cells produce water vapor, heat and, depending on the fuel source, very small amounts of nitrogen dioxide and other emissions. PEMFC cells generally produce fewer nitrogen oxides than SOFC cells: they operate at lower temperatures, use hydrogen as fuel, and limit the diffusion of nitrogen into the anode via the ...
As the pressure in the chamber is compensated a turbine spins to generate electricity. In Braun's article he states that this process is easy to understand in a more broken down manner. Two solutions, A being salt water and B being fresh water are separated by a membrane. He states "only water molecules can pass the semipermeable membrane.
Furthermore, the term "fuel cell" is usually reserved for cells that produce electricity from a chemical redox reaction, [8] [9] whereas Meyer's fuel cell consumed electricity, as shown in his patents and in the circuit pictured on the right. Meyer describes in a 1990 patent the use of a "water fuel cell assembly" and portrays some images of ...
PEM fuel cells use a solid polymer membrane (a thin plastic film) which is permeable to hydrogen ions when it is saturated with water, but does not conduct electrons. It uses a proton-exchange membrane, or polymer-electrolyte membrane (PEM), which is a semipermeable membrane generally made from ionomers and designed to conduct protons while ...
A fuel cell is an electrochemical cell that reacts hydrogen fuel with oxygen or another oxidizing agent, to convert chemical energy to electricity. [citation needed] Fuel cells are different from batteries in requiring a continuous source of fuel and oxygen (usually from air) to sustain the chemical reaction, whereas in a battery the chemical ...
To fuel a hydrogen car from water, electricity is used to generate hydrogen by electrolysis. The resulting hydrogen is an energy carrier that can power a car by reacting with oxygen from the air to create water, either through burning in a combustion engine or catalyzed to produce electricity in a fuel cell.
A unitized regenerative fuel cell (URFC) is a fuel cell based on the proton exchange membrane which can do the electrolysis of water in regenerative mode and function in the other mode as a fuel cell recombining oxygen and hydrogen gas to produce electricity.
This is the basis of all batteries and fuel cells. For example, gaseous oxygen (O 2) and hydrogen (H 2) can be combined in a fuel cell to form water and energy, typically a combination of heat and electrical energy. [25] Conversely, non-spontaneous electrochemical reactions can be driven forward by the application of a current at sufficient ...