A protocol for quantifying hydrogen evolution by dye-sensitized molecular photocathodes and its implementation for evaluating a new covalent architecture based on an optimized dye-catalyst dyad

Dalton Transactions : an International Journal of Inorganic Chemistry
Christopher D WindleV Artero

Abstract

A protocol that combines gas chromatography and a high-sensitivity micro Clark-type electrode is described to quantify hydrogen production across gas and solution phases for systems operating at very low currents such as dye-sensitized H2-evolving photocathodes. Data indicate that a significant fraction of H2 remains in aqueous solution even after several hours of experiments. Using this protocol, re-evaluation of a dye-sensitized H2-evolving photocathode based on a dye-catalyst dyad showed a reproducible 66% increase of the faradaic efficiency compared with previously reported headspace GC measurements [Kaeffer et al., J. Am. Chem. Soc., 2016, 138, 12308-12311]. This dyad was based on an organic push-pull dye where donor and acceptor are separated by one thiophene group. Insertion of a second thiophene group between the donor and acceptor led to a more efficient system with 30% improved faradaic efficiency for H2 evolution.

References

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Citations

Jun 17, 2020·ACS Applied Materials & Interfaces·Kelly L MaternaLeif Hammarström
Jan 12, 2021·Journal of the American Chemical Society·Jie HuangClaudia Turro
May 29, 2019·Journal of the American Chemical Society·Christopher D WindleVincent Artero

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Methods Mentioned

BETA
column chromatography

Software Mentioned

Unisense

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