Photocurrent Generation and Polarity Switching in Electrochemical Cells through Light-induced Excited State Proton Transfer of Photoacids and Photobases**

Anna Yucknovsky, Yaniv Shlosberg, Noam Adir, Nadav Amdursky

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Light is a common source of energy in sustainable technologies for photocurrent generation. To date, in such light-harvesting applications, the excited electrons generate the photocurrent. Here, we introduce a new mechanism for photocurrent generation that is based on excited state proton transfer (ESPT) of photoacids and photobases that can donate or accept a proton, respectively, but only after excitation. We show that the formed ions following ESPT can either serve as electron donors or acceptors with the electrodes, or modify the kinetics of mass transport across the diffuse layer, both resulting in photocurrent generation. We further show that control of the current polarity is obtained by switching the irradiation between the photoacid and the photobase. Our study represents a new approach in photoelectrochemistry by introducing ESPT processes, which can be further utilized in light-responsive energy production or energy storage.

Original languageEnglish
Article numbere202301541
JournalAngewandte Chemie - International Edition
Volume62
Issue number28
DOIs
StatePublished - 10 Jul 2023
Externally publishedYes

Keywords

  • 2-Naphthol-6-Sulfonate
  • 6-Aminoquinoline
  • Electrochemical Cell
  • Photoacids
  • Photobases

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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