Abstract: An aspect of the present disclosure is a photoelectrochemical device that includes a first cell that includes a first semiconductor alloy, a capping layer that includes a second semiconductor alloy, and a passivating layer that includes a third semiconductor alloy, where the passivating layer is positioned between the first cell and the capping layer, and at least a portion of the capping layer is configured to be in direct contact with an electrolyte.

Abstract: The present disclosure relates to a photoelectrochemical electrode that includes an absorber layer having a quantum well, where the photoelectrochemical electrode is configured to perform a first reaction defined as, 4H?+4e?2H2, or a second reaction defined as, 2H2OO2+4H++4e?, when the photoelectrochemical electrode is configured to be in contact with water.

Abstract: The present disclosure relates to a composition that includes, in order: a first layer that includes MAw; a second layer that includes MOyAz; and a third layer that includes MOx, where M includes a transition metal, A includes at least one of sulfur, selenium, and/or tellurium, w is between greater than zero and less than or equal to five, x is between greater than zero and less than or equal to five, y is between greater than zero and less than or equal to five, and z is between greater than zero and less than or equal to five. In some embodiments of the present disclosure, the transition metal may include at least one of molybdenum and/or tungsten. In some embodiments of the present disclosure, A may be sulfur.

Abstract: The present disclosure relates to photoelectrochemical devices and systems for capturing the energy of electromagnetic radiation and utilizing the captured energy for electrolysis to produce hydrogen gas and oxygen gas.

Abstract: The present disclosure relates to a composition that includes, in order: a first layer that includes MAw; a second layer that includes MOyAz; and a third layer that includes MOx, where M includes a transition metal, A includes at least one of sulfur, selenium, and/or tellurium, w is between greater than zero and less than or equal to five, x is between greater than zero and less than or equal to five, y is between greater than zero and less than or equal to five, and z is between greater than zero and less than or equal to five. In some embodiments of the present disclosure, the transition metal may include at least one of molybdenum and/or tungsten. In some embodiments of the present disclosure, A may be sulfur.

Abstract: An aspect of the present disclosure is a photoelectrochemical device that includes a first cell that includes a first semiconductor alloy, a capping layer that includes a second semiconductor alloy, and a passivating layer that includes a third semiconductor alloy, where the passivating layer is positioned between the first cell and the capping layer, and at least a portion of the capping layer is configured to be in direct contact with an electrolyte.

Abstract: The present disclosure relates to photoelectrochemical devices and systems for capturing the energy of electromagnetic radiation and utilizing the captured energy for electrolysis to produce hydrogen gas and oxygen gas.

Abstract: Two designs for rooftop irrigation apparatus are provided. The apparatus employ sub-irrigation and wicking technology to nourish vegetation supported by the apparatus. The apparatus may be placed on outdoor surfaces such as roofs. The first apparatus comprises interlocking modules. The use of sub-irrigation technology enables the modules to sustain a wide variety of plant-life. In addition, the plants may be removed and replaced easily by other plants, including hydroponic plants and vegetables. The second apparatus is a tray that contains an array of wicked protrusions that may hold plant roots and nourish the plants through sub-irrigation. Both apparatus may utilize control systems to control the level of water underneath the vegetation. Excess water may be stored in an auxiliary tank for later use or discharged from the system to decrease apparatus load.