26TH SYMPOSIUM ON PHOTONICS AND OPTICS SPO 2025

Energy state of the electronic subsystem of porous carbon material caused by laser irradiation

7 Nov 2025, 09:45

15m

Room 261(Laboratory building) (Zoom and Faculty of Physics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)

Oral Photonics, Lasers & Sensing

Speaker

Ivan Budzuliak (Vasyl Stefanyk Carpathian National University)

Description

The influence of laser irradiation on the electrochemical properties of porous carbon material (PCM) doped with Er and Cr, as an electrode material of supercapacitors, was established from the analysis of impedance spectroscopy data. It has been experimentally shown that the specific capacitance of supercapacitors with electrodes of PCM doped with Er and Cr, increases by 40% and 60%, respectively. An increase in the Coulomb efficiency of supercapacitors formed on the basis of irradiated and doped with Er and Cr PCM has been established.
The PCM samples doped with Cr / Er were irradiated with a Nd:YAG laser. The pulse duration was τ = 15 ns, the energy in the pulse was 0.01-0.015 J/cm2, the irradiation duration was T = 1.5-3 min, and the pulse repetition rate was f = 40-60 Hz. Thus, the choice of Er and Cr was due to the fact that they have a high density of electronic states near the Fermi level.
It is found that laser irradiation of Er and Cr-doped PCM increases the specific capacitance of supercapacitors formed on its basis by 40% and 60%, respectively. The internal resistance of Cr-doped PCM after laser irradiation grows by more than four times while remains practically unchanged for the Er-doped PCM. Also the Coulomb efficiency of Er/Cr-doped PCM supercapacitors practically does not change during first 105 charge/discharge cycles.