Photoelectrochemistry and hybrid solar conversion

Stuart Licht

doi:10.1017/CBO9780511718786.056

49 - Photoelectrochemistry and hybrid solar conversion

from Part 6 - Energy storage, high-penetration renewables, and grid stabilization

Published online by Cambridge University Press: 05 June 2012

Stuart Licht

Edited by

David S. Ginley and

David Cahen

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Stuart Licht: Affiliation:
Department of Chemistry, George Washington University, Washington, DC, USA
David S. Ginley: Affiliation:
National Renewable Energy Laboratory, Colorado
David Cahen: Affiliation:
Weizmann Institute of Science, Israel

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Summary

Focus

Photoelectrochemistry studies photo-driven electrochemical processes (light-driven processes which interconvert electrical and chemical energy). As with photovoltaics, photoelectrochemical processes can directly convert sunlight into electricity, but have the additional capabilities of being able to store energy, as in solar batteries, or to directly convert solar energy to chemical energy, as in the production of hydrogen fuel or disinfectants. The challenges involved, which have impeded the development of photoelectrochemical devices, can include corrosion, lower solar-energy-conversion efficiency, and packaging vulnerabilities of liquid systems. (i) Dye-sensitized solar cells, (ii) STEP energetic chemical generation and (iii) photoelectrochemical waste treatment are technologies that address many of these challenges.

Synopsis

Society's electrical needs are largely continuous. However, clouds and darkness dictate that photovoltaic (PV) solar cells have an intermittent output. A photoelectrochemical solar cell (PEC) can generate not only electrical but also electrochemical energy, thereby providing the basis for a system with an energy-storage component. Sufficiently energetic insolation incident on semiconductors can drive electrochemical oxidation/reduction and generate chemical, electrical, or electrochemical energy. Aspects include efficient dye-sensitized or direct solar-to-electrical energy conversion, solar electrochemical synthesis (electrolysis), including the splitting of water to form hydrogen, the generation of solar fuels, environmental cleanup, and solar-energy-storage cells. The PEC utilizes light to carry out an electrochemical reaction, converting light to both chemical and electrical energy. This fundamental difference between the PV solar cell's solid/solid interface and the PEC's solid/liquid interface has several ramifications in cell function and application. Energetic constraints imposed by single-bandgap semiconductors have limited the demonstrated values of photoelectrochemical solar-to-electrical energy-conversion efficiency for and using multiple-bandgap tandem cells can lead to significantly higher conversion efficiencies. Photoelectrochemical systems not only may facilitate solar-to-electrical energy conversion, but also have led to investigations into the solar photoelectrochemical production of fuels, photoelectrochemical detoxification of pollutants, and efficient solar thermal electrochemical production (STEP) of metals, fuels, and bleach, and carbon capture.

Type: Chapter
Information: Fundamentals of Materials for Energy and Environmental Sustainability , pp. 692 - 710

DOI: https://doi.org/10.1017/CBO9780511718786.056 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2011

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49 - Photoelectrochemistry and hybrid solar conversion

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