期刊
ANALYTICAL CHEMISTRY
卷 90, 期 5, 页码 3045-3049出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.7b04728
关键词
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资金
- NSF under the NSF Center for Chemical Innovations [CHE-1305124]
- Basic Science Research Program through the National Research Foundation (NRF) of Korea - Ministry of Science, ICT and Future Planning [NRF-2017R1C1B2011074]
- Yonsei University Future-Leading Research Initiative [22-0030]
- Institute for Basic Science [IBS-R026-D1]
To understand the pathway of a photo-electrochemical (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 Fe4+ 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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