There are growing concerns about global warming and the depletion of petroleum resources. Thus, developing renewable energy production technologies is one of the major scientific challenges in our world. However, the success of photoelectrochemical (PEC) technologies depends not only on achieving highly efficient devices, but also on dramatically reducing their cost. Therefore, the development of earth-abundant and inexpensive materials via less energy-intensive and costly processes is of immense importance. Our group is working on the development of novel earth-abundant visible light absorbing compounds as a sensitizers onto metal oxides (TiO2, Fe2O3, BiVO4 etc.) as well as the earth-abundant and inexpensive electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) with catalytic performance rivaling that of the noble metal catalysts.