Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.392
Publication date: 7th February 2022
Photocatalytic hydrogen production is viewed as a promising means of tackling the current
energy crisis.[1] Oxygen tolerance is crucial for scalable H2 production but reported activities
for air-tolerant H2 production are typically much lower than their inert counterparts, even for
highly active materials.[2] Most strategies to enhance the O2 tolerance focus on photocatalyst
design and modification, while the studies of the role of reaction media for solar H2 production
have not received much attention to date. We present a series of ionic liquids (ILs) as a novel
reaction medium for efficient solar H2 production at a carbon nitride-based photocatalyst.
Under inert conditions, sacrificial H2 production in these ILs is competitive with an aqueous
solution and has an increased performance for some media.[3] Moreover, under aerobic
conditions, a remarkable retention of the photocatalytic activity is observed in ILs, with an O2
tolerance of upwards of 90% after 14 hours whereas activity is largely quenched in water under
otherwise identical conditions. We utilise electrochemical techniques to rationalise the high O2
tolerance on the basis for a diffusion model, which enables us to enhance the oxygen tolerance
of a photocatalytic system for solar fuel generation through solvent design.
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