Combined hydrogen supply and fuel cell processes for increased efficiency of electricity generation

A method comprising:

• reacting methane with a catalyst in one or more reaction chambers to produce at least hydrogen and solid carbon, wherein the one or more reaction chambers each contain a liquid base fluid, carrier droplets, and the catalyst;
• introducing at least a portion of the hydrogen to a fuel cell to generate at least electricity and heat;
• pumping a fracturing fluid into a wellbore with one or more pumps powered by at least a portion of the electricity from the fuel cell;
• and
• capturing a portion of the heat from the fuel cell and a portion of a waste heat generated from the one or more pumps to preheat at least a portion of the methane prior to the reacting.

A system comprising:

• a methane preheater;
• a reaction system in fluid communication with the methane preheater, wherein the reaction system comprises one or more reaction chambers containing a liquid base fluid, carrier droplets and a catalyst, wherein the reaction system is configured to decompose methane;
• a hydrogen storage system in fluid communication with the reaction system;
• a hydrogen fuel cell in fluid communication with the hydrogen storage system, wherein the hydrogen fuel cell is configured to generate electricity from hydrogen;
• and
• a heat recovery unit configured to supply waste heat from the hydrogen fuel cell to the methane preheater.