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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

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Accumulative electron transfer: multiple charge separation in artificial photosynthesis.

Susanne Karlsson¹, Julien Boixel, Yann Pellegrin

¹Department of Photochemistry and Molecular Science, Uppsala University, Box 523, SE-751 20 Uppsala, Sweden.

Faraday Discussions

|April 5, 2012

Summary

Artificial photosynthesis requires accumulating electrons for fuel production. One molecular system achieved efficient two-electron transfer using light, demonstrating progress in artificial photosynthesis research.

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Area of Science:

Photochemistry
Catalysis
Materials Science

Background:

Artificial photosynthesis aims to mimic natural processes for fuel generation.
Coupling single-electron photoinduced charge separation with multi-electron reactions is crucial.
Accumulating redox equivalents at catalytic sites is necessary for efficient fuel formation and water splitting.

Purpose of the Study:

To investigate challenges in accumulative electron transfer for artificial photosynthesis.
To design and evaluate molecular systems for multi-electron transfer.
To understand factors influencing efficient charge accumulation in photosensitizer-acceptor systems.

Main Methods:

Synthesis of Ru(II)-polypyridine photosensitizers with appended donors.
Integration of photosensitizers with nanoporous TiO2 acceptors.
Spectroscopic analysis to monitor charge separation and electron transfer dynamics.

Main Results:

One system (dye 4) demonstrated efficient accumulative electron transfer.
This system achieved a two-electron charge-separated state upon two-photon excitation.
Other systems failed to show accumulative transfer due to competing reactions.

Conclusions:

Designing systems for efficient accumulative electron transfer is challenging.
Success requires careful tuning of molecular components to prevent competing pathways.
This work highlights progress and difficulties in developing molecular artificial photosynthesis.