Principles and Limitations of Photoelectrochemical Fuel Generation

Mei, Bastian; Wenderich, Kasper

doi:10.1002/9783527815296.ch4

Heterogeneous Photocatalysis 2021

DOI: 10.1002/9783527815296.ch4

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Principles and Limitations of Photoelectrochemical Fuel Generation

Bastian Mei

Kasper Wenderich

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2024

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Band Diagram Insights into the Kinetic and Thermodynamic Engineering of Tandem Photocatalytic Cells

Goyal,

Zhu,

Bevan

2024

J. Phys. Chem. C

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In this work, we theoretically investigate the impact of kinetic and thermodynamic properties on the performance of photocatalytic cells operating in an unassisted tandem configuration, including electron affinity and ionization energies, recombination rates, and reaction rates. To this end, we present general rules and metrics for identifying and isolating the origin of an observed shift in the onset potential at either the photoanode or the photocathode of these devices. The correlation between kinetic and thermodynamic shifts in the onset potential is demonstrated through the use of band diagrams and key comparable features within readily accessible characterization tools: current−voltage plots are taken both under illumination and in the dark and further coupled with Mott−Schottky plots. To illustrate this conceptual framework, a model system comprised of a p-type doped BiVO 4 photocathode and an n-type doped BiVO 4 photoanode is employed. By varying each of the aforementioned kinetic and thermodynamic parameters in isolation, the manner in which these various mechanisms shift the onset potential is demonstrated. This work intends to showcase how kinetic and thermodynamic effects are distinctly manifested in these commonly used characterization tools and further proposes thermodynamic band-edge engineering as a potentially useful and largely unexplored avenue for possibly improving tandem cell performance, in addition to the conventional approach of optimizing kinetics.

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Band Diagram Insights into the Kinetic and Thermodynamic Engineering of Tandem Photocatalytic Cells

Goyal,

Zhu,

Bevan

2024

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

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Principles and Limitations of Photoelectrochemical Fuel Generation

Cited by 1 publication

References 40 publications

Band Diagram Insights into the Kinetic and Thermodynamic Engineering of Tandem Photocatalytic Cells

Band Diagram Insights into the Kinetic and Thermodynamic Engineering of Tandem Photocatalytic Cells

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