One of two electrodes in a fuel cell or battery The cathode, the positive post of the fuel cell, has channels etched into it that distribute the oxygen to the surface of the catalyst It also conducts the electrons back from the external circuit to the catalyst, where they can recombine with the hydrogen ions and oxygen to form water
The part of a voltaic battery by which the electric current leaves substances through which it passes, or the surface at which the electric current passes out of the electrolyte; the negative pole; opposed to anode
a negatively charged electrode that is the source of electrons in an electrical device the positively charged terminal of a voltaic cell or storage battery that supplies current
The negative end of an electric field The electrode in an electrochemical cell toward which the cations flow and the electrode at which reduction occurs