Hydrogen economy water electrolysis

One source of hydrogen for the hydrogen economy is electrolysis of water. Hydrogen is evolved at the cathode. Focusing on the hydrogen generating region, the cathode and the electrolyte between the membrane separator and cathode, the cathode reaction that can occur is ... 

In the 1970s, a first serious energy crisis related to a sharp increase in the cost of fossil fuels led to a revival of interest in water electrolysis. This time the interest was focused on hydrogen as an energy vector that could possibly replace fossil fuels in the world economy The aim was twofold to become relatively independent of the influence of the oil market and to reduce the environmental impact of the... 

In the meantime, the sharp decrease in the cost of fossil fuels to the levels before the 1970s led to a weakening (again ) of interest in a hydrogen economy and to a slowdown of research on improving water electrolysis. 

In a hydrogen economy, hydrogen for transportation fuels is produced by the electrolysis of water. 

Water electrolysis is currently only of interest where favorable conditions hold (accounts for < 3% of hydrogen production), but could become important in a future hydrogen-based economy... 

However, the electrolysis of water has received considerable recent attention in the context of the so-called hydrogen economy, in which hydrogen gas is employed as an energy vector. 

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