How exactly does a catalyst (platinum.. with carbon.. something?) removes the electron from a hydrogen atom? (that means that quite a lot of energy was given to the hydrogen atom and the electron and proton separately (and the two particle system together) has more energy now.) Does the energy come form materials internal kinetic energy/ kinetic energy of the molecules/ atoms? .. as far as I know, the energy of particles at room temperature is way below what is necessary for hydrogen ionization.. (Im talking about fuel cell here.) .. and if im talking about fuel cells here, then - why it is even necessary to have oxygen at "the other end" ? .. why cant hydrogen ion (proton) just re-connect with the electron and ... just stay hydrogen? In this case the energy to the "load" would come from.. internal kinetic energy of the materials aka heat. .. or what?