Michigan State University Science at the Edge Engineering Seminar September 30th, 2016 11:30 a.m. Room1400 Biomedical and Physical Sciences Building Refreshments served at 11:15 a.m. Professor Nathan. S. Lewis California Institute of Technology Division of Chemistry and Chemical Engineering Beckman Institute and Kavli Nanoscience Institute Sunlight-Driven Hydrogen Formation by Membrane-Supported Photoelectrochemical Water Splitting Abstract We are developing an artificial photosynthetic system that will utilize sunlight and water as inputs and will produce hydrogen and oxygen as outputs using a modular, parallel development approach in which the three distinct primary components-the photoanode, the photocathode, and the product-separating but ion-conducting membrane-are fabricated and optimized separately before assembly into a water-splitting system. The design principles incorporate two separate, photosensitive semiconductor/liquid junctions that will collectively generate the 1.7-1.9 V at open circuit to support both the oxidation of H2O (or OH-) and the reduction of H+ (or H2O). The photoanode and photocathode will consist of rod-like semiconductor components, with attached heterogeneous multi-electron transfer catalysts, needed to drive the oxidation or reduction reactions at low overpotentials. The high aspect-ratio semiconductor rod electrode architecture allows for the use of low cost, earth abundant materials without sacrificing energy conversion efficiency due to orthogonalization of light absorption and charge-carrier collection. Additionally, the high surface-area design of the rod-based semiconductor array electrode inherently lowers the flux of charge carriers over the rod array surface relative to the projected geometric surface of the photoelectrode, lowering the photocurrent density at the solid/liquid junction and thereby relaxing demands on the activity (and cost) of any electrocatalysts. Flexible composite polymer film will allow for electron and ion conduction between the photoanode and photocathode while simultaneously preventing mixing of the gaseous products. Separate polymeric materials will be used to make electrical contact between the anode and cathode and also provide structural support. Interspersed patches of an ion conducting polymer will maintain charge balance between the two half-cells. The modularity design approach allows each piece to be independently modified, tested, and improved, as future advances in semiconductor, polymeric, and catalytic materials are made. This work will demonstrate a feasible and functional prototype and blueprint for an artificial photosynthetic system, composed of inexpensive, earth-abundant materials while simultaneously efficient, durable, manufacturably scalable, and readily upgradeable. Shawna Prater / Secretary Astrophysics Group Michigan State University 567 Wilson Road, Room 3261 Biomedical Physical Sciences Bldg East Lansing, MI 48824-2320 Ph: (517) 884-5601 Fax (517) 432-8802 [log in to unmask]<mailto:[log in to unmask]>, [log in to unmask]<mailto:[log in to unmask]>