Abstract
Solar driven water splitting can be achieved by coupling electrolyzers with PhotoVoltaics (PV). Integration of both functions in a compact PhotoElectroChemical (PEC) cell is an attractive option but presents significant scientific challenges. In this work, the design of single- and dual-compartment PEC cells for research purposes is discussed. The fabrication of separator-electrode assemblies is an important aspect, and upscaling of these architectures even to centimeter scale is not trivial. The layout of a new dual-compartment compact PEC cell with in-situ monitoring of pH, temperatures, and oxygen and hydrogen evolution for research purposes is presented. Finally, a prospect of future PEC cells for practical applications is presented.
Highlights
In a not so distant future, our society will need to be CO2 neutral by limiting dependence on fossil energy sources
This paper provides an overview of the development of PEC cells for research purposes, denoted as exPEC cells, and presents some ideas on the design of PEC cells for an ultimate practical application
An advanced understanding of PEC cell operation is required for practical and large-scale implementation. This understanding can be gained by the design and use of advanced, custom-made experimental PEC cells
Summary
In a not so distant future, our society will need to be CO2 neutral by limiting dependence on fossil energy sources. PEC cells have potential advantages over the coupled PV/electrolysis system as they can provide a more compact and integrated design They can be operated at lower current density exhibiting lower overpotentials and higher efficiency, and enable the use of earthabundant, cheap electrode materials instead of expensive platinum metal for the electrolyzer. PV/electrolysis systems, need an additional DC/DC converter and three devices in total A PEC cell is a device that achieves water splitting and production of a solar commodity or fuel, e.g. hydrogen, with sunlight as the only energy source. The electrode assembly is the heart of the PEC cell It consists of photoactive materials such as semiconductors or photosensitizers that absorb light and produce charge carriers. This paper provides an overview of the development of PEC cells for research purposes, denoted as exPEC cells, and presents some ideas on the design of PEC cells for an ultimate practical application
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