With the increasing population and economic boom, the demand
for energy escalates everyday. However, the major source of energy,
fossil fuel, is depleting and its price is projected to rise. Therefore,
finding clean, renewable and e nvironmentally friendly energy
sources is an urgent and practical issue of the entire world, not just
any country.
One of those clean and limitless energy sources is solar energy.
The question is how can we convert this massive source into other
types of energy that can be stored, distributed and utilized on
demand. Besides solar cell, another method is to store solar energy in
the bond of H2 molecules through photoelectrochemical (PEC) cells,
also known as artificial leaf. This process is similar to the
photosynthesis in nature: using sunlight to split water into H2 và O2.
The photoelectrochemical cell has the cathode made of p-type
semiconductor and the anode made of n-type semiconductor.