Surface Interrogation Scanning Electrochemical Microscopy for a Photoelectrochemical Reaction: Water Oxidation on a Hematite Surface

Jae Young Kim, Hyun Seo Ahn, Allen J. Bard

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

To understand the pathway of a photoelectrochemical (PEC) reaction, quantitative knowledge of reaction intermediates is important. We describe here surface interrogation scanning electrochemical microscopy for this purpose (PEC SI-SECM), where a light pulse to a photoactive semiconductor film at a given potential generates intermediates that are then analyzed by a tip generated titrant at known times after the light pulse. The improvements were demonstrated for photoelectrochemical water oxidation (oxygen evolution) reaction on a hematite surface. The density of photoactive sites, proposed to be Fe 4+ species, on a hematite surface was successfully quantified, and the photoelectrochemical water oxidation reaction dynamics were elucidated by time-dependent redox titration experiments. The new configuration of PEC SI-SECM should find expanded usage to understand and investigate more complicated PEC reactions with other materials.

Original languageEnglish
Pages (from-to)3045-3049
Number of pages5
JournalAnalytical Chemistry
Volume90
Issue number5
DOIs
Publication statusPublished - 2018 Mar 6

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Microscopic examination
Scanning
Oxidation
Water
Reaction intermediates
Titration
Semiconductor materials
Oxygen
ferric oxide
Experiments
Oxidation-Reduction
ferryl iron

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

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abstract = "To understand the pathway of a photoelectrochemical (PEC) reaction, quantitative knowledge of reaction intermediates is important. We describe here surface interrogation scanning electrochemical microscopy for this purpose (PEC SI-SECM), where a light pulse to a photoactive semiconductor film at a given potential generates intermediates that are then analyzed by a tip generated titrant at known times after the light pulse. The improvements were demonstrated for photoelectrochemical water oxidation (oxygen evolution) reaction on a hematite surface. The density of photoactive sites, proposed to be Fe 4+ species, on a hematite surface was successfully quantified, and the photoelectrochemical water oxidation reaction dynamics were elucidated by time-dependent redox titration experiments. The new configuration of PEC SI-SECM should find expanded usage to understand and investigate more complicated PEC reactions with other materials.",
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Surface Interrogation Scanning Electrochemical Microscopy for a Photoelectrochemical Reaction : Water Oxidation on a Hematite Surface. / Kim, Jae Young; Ahn, Hyun Seo; Bard, Allen J.

In: Analytical Chemistry, Vol. 90, No. 5, 06.03.2018, p. 3045-3049.

Research output: Contribution to journalArticle

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