Abstract:environmental problems. Hydrogen gas (H 2 ) is a clean and storable energy with a higher gravimetric energy density than gasoline (120 vs 44 MJ kg −1 ). Among various hydrogen production strategies, photoelectrochemical (PEC) water splitting has attracted much attention due to its high abundance of water, high purity of generated H 2 , and great reduction of CO 2 emission. [1][2][3][4][5] As the core of the PEC cell, the photoelectrode is composed of a photoanode and a photo cathode, which drives the oxygen ev… Show more
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