Transient photoelectrochemical microscope and transient electrochemical process measurement method

Abstract

The invention discloses a transient photoelectrochemical microscope and belongs to the microimaging system technology field of electrochemistry. The microscope comprises a digital work station system,an electrochemical detection system, a dark field microscope system, an imaging system and a delay generator system. The digital work station system is connected to the electrochemical detection system. The delay generator system is connected to the imaging system, the dark field microscope system and the digital work station system. The invention also discloses a transient electrochemical process measurement method. The method is characterized by using an electrochemical work station controlled by a two-channel digital generator to apply a pulse voltage to an Au nanoelectrode; then, using anelectrochemical detection system to collect current signals of the Au nanoelectrode, and through a delay trigger signal generated by a delay generator system, making a dark field microscopic systemand the imaging system collect scattering images of the Au nanoelectrode in a double-electric-layer formation process at different moments; and finally, using electrical and optical detection technologies to acquire a transient electrochemical process on the Au nanoelectrode, such as double-electric-layer formation.

Description

technical field [0001] The invention belongs to the technical field of electrochemical microscopic imaging systems, and in particular relates to a transient photoelectrochemical microscope and a transient electrochemical process measurement method. Background technique [0002] In recent years, electrochemical measurement methods have been continuously improved, and the limitations of time resolution and spatial resolution have been continuously broken through in technology. Among them, there are many excellent works exploring the electrochemical process on microelectrodes, such as the detection of ns-scale electric double layer charging by the Tao group. Current (J.Am.Chem.Soc.,2017,139(21),pp 7244–7249), the Baumberg group detected the change of charge density on a single nanoelectrode during charging (Nano Lett.,2017,17( 8), pp 4840–4845), etc. [0003] However, the electrochemical process is relatively complex, and the electron transfer process and electrolyte migration...

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Problems solved by technology

[0003] However, the electrochemical process is relatively complex, and the electron transfer process and electrolyte migration process in the electrochemical system are important issues that need to be explored in electrochemical detection.

Focusing on the detection methods of nano-electrodes, the traditional electrochemical detection technology will be limited. For example, it is difficult to see the medium migration on the surface of a single nano-electrode due to the limitation of spatial resolution.

However, medium migration occupies a large proportion in the transient electrochemical process on the nano-electrode, such as the formation of the electric double layer, so it is still difficult to explore the transient electrochemical process on the nano-electrode.

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