CEL-QPCE3000 Photoelectrochemical Quantum Efficiency Test and Analysis System
Introduction: The essence of photocatalysis is photoelectron catalysis, and photogenerated carriers participate in the reaction as reactants. Photoelectrochemical testing technology is a very important and effective method for photocatalytic reaction kinetics and mechanism research. Semiconductor photocatalytic technology to control environmental pollutants is an advanced oxidation technology developed from the 1980s. Under normal temperature and normal pressure, only pollutants, light and air can be used to destroy pollutants and eventually mineralize into no Toxic carbon dioxide, water and inorganic ions are expected to alleviate the increasingly serious environmental pollution problems. When a bulk semiconductor is irradiated with light having an energy equal to or higher than a semiconductor absorption threshold, the valence band electrons of the semiconductor can be excited to transition to a guide while generating corresponding holes in the valence band, thereby generating electron-hole pairs inside the semiconductor. . Under the action of the electric field of the space charge layer, the holes move to the surface of the semiconductor particle and react with the electron donor in the solution, and the electron and the electron acceptor undergo a reduction reaction, or move to the electrode substrate and pass through. The external circuit reaches the counter electrode to participate in the reduction reaction. The electrons and holes generated by photoexcitation are at least subjected to the following methods: carrier diffusion, trapping, recombination, and interface charge transfer. Among them, recombination and interface charge transfer are two competing processes, and interface charge transfer ultimately realizes the utilization of light energy. . Main applications: photoelectrochemistry, spectral response IPCE of photocatalysis, quantum efficiency QE, spectral transmittance of the sample cell, quantum efficiency and photocurrent under spectral response, DC, AC analysis, galvanic cell analysis, photoelectrochemical analysis Wait. Test items: spectral response of photoelectrochemical samples, IPCE, quantum efficiency QE, spectral transmittance, short-circuit current density, surface uniformity, etc., spectral current/voltage values of standard detectors placed in the test sample chamber and not placed in the sample The spectral transmittance of the photovoltaic cell can also be measured, and the spectral transmittance of the glass can also be measured. Technical Parameters: 1. Control mode: software control, automatic scanning, automatic elimination of errors, automatic deduction of background; 2. Spectral range: 300-1100nm (optional 200-2500nm); scanning interval ≥1nm continuously adjustable; spectral scanning fully automatic, continuous; 3. Test results Repetitive RSI <0.3% (photocurrent) 4. Working mode: AC mode AC, electrochemical DC mode DC, chopping frequency 5-1000Hz 5. Sample stage: Electric two-stage sample stage (standard reference, sample), automatic contrast analysis, placed in the shielded room. 6. Optional bias light source Configure one or two ways to cope with complex photoelectric analysis test 7. Monochromator: 1) The focal length of 300mm adopts asymmetric horizontal Czerny-Turner optical path, which is designed to ensure spectral line symmetry and good optical resolution. 2) Eliminate secondary dispersion design and effectively suppress stray light; The entrance can be used with various light sources of our company, and can be equipped with fiber optic interface to connect optical fiber; 4) can be connected to any single point detector and other accessories of our company; 5) small modulus precision grinding worm gear, long life design, Smooth and comfortable operation, low noise; 6) ※ equipped with a nitrogen-filled port for easy use in the ultraviolet and near-infrared bands with atmospheric absorption spectrum; 7) equipped with stepper motor subdivision driver, spectral accuracy and repeatability High; 8) unique design of slit design, automatic edge protection, good symmetry of width adjustment, long life; 9) software can realize any adjustment of wavelength and delay setting, USB2.0 computer interface; 10) internal optical room and The mechanical transmission chamber is strictly separated to avoid the stray light and the slight evaporation of the lubricating oil to the optical parts. The monochromator body is a casting integrated structure to ensure the stability of the optical system. 8. Light source: 500W xenon light source, using Osram imported bulb, fluctuation <0.01%. 9. Standard detector: UV-enhanced silicon detector (300-1100nm) with optional indium gallium arsenide detector (800-1600nm). 10. Electrochemical workstation: optional Ivium electrochemical workstation, and other brands;
Introduction: The essence of photocatalysis is photoelectron catalysis, and photogenerated carriers participate in the reaction as reactants. Photoelectrochemical testing technology is a very important and effective method for photocatalytic reaction kinetics and mechanism research. Semiconductor photocatalytic technology to control environmental pollutants is an advanced oxidation technology developed from the 1980s. Under normal temperature and normal pressure, only pollutants, light and air can be used to destroy pollutants and eventually mineralize into no Toxic carbon dioxide, water and inorganic ions are expected to alleviate the increasingly serious environmental pollution problems. When a bulk semiconductor is irradiated with light having an energy equal to or higher than a semiconductor absorption threshold, the valence band electrons of the semiconductor can be excited to transition to a guide while generating corresponding holes in the valence band, thereby generating electron-hole pairs inside the semiconductor. . Under the action of the electric field of the space charge layer, the holes move to the surface of the semiconductor particle and react with the electron donor in the solution, and the electron and the electron acceptor undergo a reduction reaction, or move to the electrode substrate and pass through. The external circuit reaches the counter electrode to participate in the reduction reaction. The electrons and holes generated by photoexcitation are at least subjected to the following methods: carrier diffusion, trapping, recombination, and interface charge transfer. Among them, recombination and interface charge transfer are two competing processes, and interface charge transfer ultimately realizes the utilization of light energy. . Main applications: photoelectrochemistry, spectral response IPCE of photocatalysis, quantum efficiency QE, spectral transmittance of the sample cell, quantum efficiency and photocurrent under spectral response, DC, AC analysis, galvanic cell analysis, photoelectrochemical analysis Wait. Test items: spectral response of photoelectrochemical samples, IPCE, quantum efficiency QE, spectral transmittance, short-circuit current density, surface uniformity, etc., spectral current/voltage values of standard detectors placed in the test sample chamber and not placed in the sample The spectral transmittance of the photovoltaic cell can also be measured, and the spectral transmittance of the glass can also be measured.
