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Sunlight-driven hydrogen formation by membrane-supported photoelectrochemical water splitting

Lewis, Nathan S. (2018) Sunlight-driven hydrogen formation by membrane-supported photoelectrochemical water splitting. In: 255th American Chemical Society National Meeting & Exposition, March 18-22, 2018, New Orleans, LA.

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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-sepg. but ion-conducting membrane-are fabricated and optimized sep. before assembly into a water-splitting system. The design principles incorporate two sep., photosensitive semiconductor/liq. junctions that will collectively generate the 1.7-1.9 Vat open circuit to support both the oxidn. of H2_O (or OH-) and the redn. of H+ (or H_2O). The photoanode and photocathode will consist of rod-like semiconductor components, with attached heterogeneous multielectron transfer catalysts, needed to drive the oxidn. or redn. 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. Addnl., 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 d. at the solid/liq. 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. Sep. polymeric materials will be used to make elec. 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.

Item Type:Conference or Workshop Item (Paper)
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Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2018 American Chemical Society.
Record Number:CaltechAUTHORS:20180413-153323263
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85853
Deposited By: Tony Diaz
Deposited On:13 Apr 2018 22:56
Last Modified:03 Oct 2019 19:36

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