Publication date: 15th May 2025
Colloidal semiconducting nanocrystal quantum dots (QDs) are powerful elements of a photocatalytic system useful for enabling a variety of chemical transformations owning to their strong light-absorbing properties and high degree of size-, shape-, and composition-tunability. We recently found that CdSe QDs and simple aqueous Ni2+ salts in the presence of a sacrificial electron donor form a highly efficient, active, and robust system for photochemical reduction of protons to molecular hydrogen. However, a major roadblock in solar fuels production from this system is the requirement of a sacrificial electron donor, yielding systems valuable for study but not feasible for application. We will present a completely new approach to addressing this problem. Utilizing the natural respiratory pathway of Shewanella bacteria, which engage in extracellular electron transfer, electrons are provided to CdSe QDs photocatalysts for H2 production directly from the bacteria. In this living bio-nano system, the nutrients that Shewanella consume become the electron source, and thus the system requires no external potential to operate continuously. Illuminating this system at 530 nm yields continuous hydrogen generation for 168 h, which can be lengthened considerably further by replenishing bacterial nutrients. This strategy could be applied to a host of different NC photocatalytic reactions to yield sustainable systems for NC-mediated photocatalysis.
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