In efforts to reduce dependence on fossil fuel and to cut down greenhouse gases emission, green renewable energy resources such as solar energy, biomass and hydrogen fuel are gaining attention. Hydrogen fuel cells produce electricity by combining hydrogen and oxygen atoms. The hydrogen reacts with oxygen across an electrochemical cell similar to that of a battery to produce electricity, water, and small amounts of heat

Hydrogen can be produced from water splitting process, namely 2H0O 2H0 + O0 . In a photocatalytic water splitting technique, photon energy of minimal 1.23 eV is needed at pH = 0 and standard temperature 25 degree Celcius and pressure 1bar.

Explain the differences between microcanonical ensemble, canonical ensemble and grand canonical ensemble.