Electrochemical atomic force microscopy

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Electrochemical atomic force microscopy ( ECAFM ) is a specialization in scanning probe microscopy (SPM), which combines the imaging properties of an AFM with electrochemical measurement methods. ECAFM enables the investigation of the liquid-solid interface . An in-situ measurement of the topography of an electrode surface is possible while electrochemical reactions are taking place. This technique was first used in 1996 by Kouzeki et al.

Section of an electrochemical atomic force microscope
(a) cantilever and tip
(b) inert electrochemical cell with connection option for counter and reference electrode
(c) electrolyte
(d) sample
(e) low-vibration sample holder is moved by piezo.

Measuring principle

Based on the classic AFM, the cantilever is inserted into an electrochemical cell with a tip and brought closer to the sample surface. The tip of the AFM is non-conductive and scans as a passive element over the surface of the sample to capture the topography of the sample. The examined surface acts as a working electrode in the electrochemical cell and should therefore be conductively connected to a potentiostat. The circuit of the 3-electrode structure can be closed with a counter electrode and reference electrode. Various electrochemical investigation methods such as cyclic voltammetry , chronoamperimetry or the like can thus be used.

See also

Individual evidence

  1. ↑ Masashi Shiota, Yoshiaki Yamaguchi, Yasuhide Nakayama, Nobumitsu Hirai, Shigeta Hara: In situ EC-AFM observation of antimony effect for lead dioxide electrode . In: Journal of Power Sources, Proceedings of the International Conference on Lead-Acid Batteries, LABAT '02 . 113, No. 2, January 27, 2003, ISSN  0378-7753 , pp. 277-280. doi : 10.1016 / S0378-7753 (02) 00523-2 . Retrieved October 24, 2018.
  2. ↑ Takashi Kouzeki, Shinya Tatezono, Hisao Yanagi: Electrochromism of Orientation-Controlled Naphthalocyanine Thin Films . In: The Journal of Physical Chemistry . 100, No. 51, January 1996, pp. 20097-20102. doi : 10.1021 / jp962307j .
  3. ↑ Melania Reggente, Daniele Passeri, Marco Rossi, Emanuela Tamburri, Maria Letizia Terranova: Electrochemical atomic force microscopy: In situ monitoring of electrochemical processes . Author (s), 2017, doi : 10.1063 / 1.4997138 .