Photoelectrochemical System for Hydrogen Generation

DOE is seeking the development of innovative photoelectrochemical materials for efficient long term hydrogen production. Photoelectrochemical systems produce hydrogen from water by means of special semiconductors using energy from sunlight, but they are still in the early stage of development. New materials are needed in order for these systems to take full advantage of their ability to directly generate hydrogen at low temperatures, without the use of carbon-rich materials such as natural gas or biomass. This project will develop a new photoelectrochemical system for hydrogen generation (PHESHYG), based on proven semiconductor technology. In this approach, an electrochemically deposited A2B6 semiconductor electrode will provide an energy bandgap of 2-2.3 eV, satisfying the requirements for hydrogen-generation efficiency under solar illumination (>10%) and durability (>1000 hr). In Phase I, the optimal structure of the semiconductor electrode and the method of electrochemical deposition will be developed. Then, the electrode will be fabricated, characterized (including evaluation of its lifetime in electrolyte), and demonstrated for the generation of the hydrogen. Commercial Applications and other Benefits as described by the awardee: The technology should be directly related to the needs for hydrogen production and efficiency, while maintaining material durability for long term use. When implemented for commercial hydrogen generation, a cost of $0.01/L should be possible, providing great social and economic impact in furthering the growth of hydrogen energetics.