The research group led by Professor Zhenhui Kang from Soochow University presented the synthesis, structural properties and photoelectrochemical properties of carbon dots (CDs) and their applications in catalytic conversion. In addition, a new technique for characterizing the photocatalytic process, transient photo-voltage/current (TPC/TPV), in the CD catalytic system is also discussed.
The unique advantages and great potential of CDs in clean energy conversion and storage cannot be ignored. In addition, photoelectric catalysis has a very complex interfacial process, so it is very difficult to study the mechanism in depth. The present characterization techniques are easy to obtain steady-state information in the photoelectrocatalytic process, but it is difficult to reverse the change during the reaction process.
Therefore, Professor Kang’s article published in International Journal of Radical Industrializationpresented a new method for in situ analysis and kinetic characterization, using CDs as an excellent model. TPV technology was used to collect and analyze the dynamic process affected by CDs in the photoelectric stimulation process. As new non-contact detection techniques, transient photo-induced voltage/current (TPV/TPC) has been developed to detect and study the kinetics of charge transfer, which can sensitively reflect the complex electron separation and transport behavior in photo/electrical catalysts.
By combining rotating electrode technology with transient photovoltaic response, a method model for dynamic process From photoelectric directional extraction and photovoltaic effect in situ. The basic idea involved in the method is based on the directional movement of charge in response to photovoltaic. Taking the hydrolysis reaction as an example, the number of electrons transferred in the in situ photocatalysis half reaction can be obtained by changes of the transient light-induced current in the disk/ring electrode.
Data collected with a temporal resolution of 50 ns by shining a 4 ns pulsed laser onto the sample that can provide detailed information on charge transfer, storage, recombination processes, and light-based charge stimulating reactions. The entire representation covers reaction times from microseconds to seconds. By comparing parameters such as maximum intensity, curve shape, time of maximum intensity, integrated area and decay constant, the interfacial electron transfer kinetics and reaction kinetics of in situ catalytic processes can be obtained directly or indirectly. These photovoltaic response data can help us determine the catalytic active site, catalytic center and reactant properties, and can even be used to discover new properties of catalysts beyond expectations.
Professor Kang said, “CDs may not represent the most efficient catalyst, but it does provide a revolutionary understanding of the catalyst mechanism and the design principle of the catalyst. TPV technology may not represent the most advanced and universal technology, but it brings new and specific information on the electron transfer kinetics of the catalyst mechanism and catalyst design.”
Yunjie Zhou et al, Advanced multifunctional carbon dots in photoelectrochemical-based energy conversion, International Journal of Radical Industrialization (2022). DOI: 10.1088/2631-7990/ac8e3a
Introduction to the International Journal of Radical Industrialization
the quote: Multifunctional Advanced Carbon Dots in Photovoltaic-Based Energy Conversion (2022, September 22) Retrieved on September 22, 2022 from
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