Photocatalytic Generation of Hydrogen in Degrading Soluble Organic Pollutants with Metal-Ceramic Composites

Skvortsova, L. N.; Batalova, V. N.; Болгару, К. А.; Artyukh, I. A.; Reger, Anton

doi:10.1134/s10704272190100221

Cited by 5 publications

(2 citation statements)

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“…The high efficiency (> 98 %) is achieved by combining the advantages of both heterogeneous and homogeneous photocatalysis: with H 2 O 2 present in the solution, the partially dissolved phase of metallic Fe creates the conditions for the photo-Fenton reaction that generates hydroxyl radicals. [16][17][18] Fe…”

Section: Introductionmentioning

confidence: 99%

Hydrogen production by Photocatalytic Degradation of Organic Substances Using Iron‐Containing Metal‐Ceramic Composites Under UV and Visible‐Light Irradiation

et al. 2021

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Metal‐ceramic composites with ceramic matrix modified with semiconductors (SiN‐SiC and TiN) were synthetized by Self‐propagating high‐temperature synthesis (SHS) technology. X‐ray diffraction (XRD) analysis was used to determine the phase composition of the composites based on the nitrides of silicon, titanium, vanadium, and boron. Surface morphology of the composites was investigated by scanning electron microscopy (SEM), and the surface iron content was estimated using an energy‐dispersive X‐ray spectrometer for SEM (EDX‐SEM). Optical properties of the composites were studied, and the band gap values of ceramic matrix semiconducting components were calculated. The comparative evaluation of photocatalytic efficiency of the composites has been done for hydrogen production from solutions of organic substances (HCOOH, H2C2O4, malic acid, citric acid, sucrose, and N2H4) under UV and visible light irradiation. It has been shown, that the high efficiency of photocatalytic hydrogen production under visible light irradiation depends on the composition of ceramic matrix containing semiconducting constituents, the nature of organic substances used, and the addition of H2O2 to the solution causing a photo‐Fenton reaction. Also, the effect of eosin on photosensitization of the process was studied. The system of VN/N2H4 has been established to exhibit the highest efficiency of hydrogen production (300–560 μmol h−1 g−1).

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Section: Introductionmentioning

confidence: 99%

Hydrogen production by Photocatalytic Degradation of Organic Substances Using Iron‐Containing Metal‐Ceramic Composites Under UV and Visible‐Light Irradiation

et al. 2021

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“…4): n змінюється від 3,6 до 3,3 (3kT/e V  0,3 В) з підвищенням температури від 294-350 К, становить n ≈ 6 (0,3  V  0,6 В) і становить n > 10 (V > 0,6 В).Значення показника неідеальності в області напруг 3kT/e  V  0,3 В близькі до 2 дають можливість припустити, що основний механізм струмопереносу визначається генераційно-рекомбінаційними процесами в області просторового заряду, а саме n змінюється від 3,6 до 3,3 з підвищенням температури в інтервалі 295-358 К (вставка рис. 4), це свідчить про те, що у вище запропонований домінуючий механізм струмопереносу, який обумовлений генераційно-рекомбінаційними процесами в області просторового заряду, роблять внесок електрично активні поверхневі стани розміщені на металургійній межі розділу досліджуваного гетеропереходу[12,13].…”

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Electrical and Photoelectric Properties of Heterojunctions MoOx/n-Cd1-xZnxTe

Solovan

Mostovyi

Parkhomenko

et al. 2021

EEJP

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The paper presents the results of studies of the optical and electrical properties of МоOx/n-Cd1-хZnхTe semiconductor heterojunctions made by depositing MoOx films on a pre-polished surface of n-Cd1-хZnхTe plates (5 × 5 × 0.7 mm3) in a universal vacuum installation Leybold - Heraeus L560 using reactive magnetron sputtering of a pure Mo target. Such studies are of great importance for the further development of highly efficient devices based on heterojunctions for electronics and optoelectronics. The fabricated МоOx/n‑Cd1‑хZnхTe heterojunctions have a large potential barrier height at room temperature (φ0 = 1.15 eV), which significantly exceeds the analogous parameter for the МоOx/n-CdTe heterojunction (φ0 = 0.85 eV). The temperature coefficient of the change in the height of the potential barrier was experimentally determined to be d(φ0)/dT = -8.7·10-3 eV K, this parameter is four times greater than the temperature coefficient of change in the height of the potential barrier for MoOx/n-CdTe heterostructures. The greater value of the potential barrier height of the МоOx/n-Cd1-хZnхTe heterojunction is due to the formation of an electric dipole at the heterointerface due to an increase in the concentration of surface states in comparison with MoOx/n-CdTe heterostructures, and this is obviously associated with the presence of zinc atoms in the space charge region and at the metallurgical boundary section of the heteroboundary. In МоOx/n‑Cd1-хZnхTe heterojunctions, the dominant mechanisms of current transfer are generation-recombination and tunneling-recombination with the participation of surface states, tunneling with forward bias, and tunneling with reverse bias. It was found that МоOx/n-Cd1-хZnхTe heterojunctions, which have the following photoelectric parameters: open circuit voltage Voc = 0.3 V, short circuit current Isc = 1.2 mA/cm2, and fill factor FF = 0.33 at an illumination intensity of 80 mW/cm2 are promising for the manufacture of detectors of various types of radiation. The measured and investigated impedance of the МоOx/n-Cd1-хZnхTe heterojunction at various reverse biases, which made it possible to determine the distribution of the density of surface states and the characteristic time of their charge-exchange, which decrease with increasing reverse bias.

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Combustion synthesis of β-SiAlON from a mixture of aluminum ferrosilicon and kaolin with nitrogen-containing additives using acid enrichment

Болгару

Reger

Верещагин

et al. 2023

Ceramics International

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Photocatalytic Generation of Hydrogen in Degrading Soluble Organic Pollutants with Metal-Ceramic Composites

Cited by 5 publications

References 9 publications

Hydrogen production by Photocatalytic Degradation of Organic Substances Using Iron‐Containing Metal‐Ceramic Composites Under UV and Visible‐Light Irradiation

Hydrogen production by Photocatalytic Degradation of Organic Substances Using Iron‐Containing Metal‐Ceramic Composites Under UV and Visible‐Light Irradiation

Electrical and Photoelectric Properties of Heterojunctions MoOx/n-Cd1-xZnxTe

Combustion synthesis of β-SiAlON from a mixture of aluminum ferrosilicon and kaolin with nitrogen-containing additives using acid enrichment

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