Mn-doped molybdenum trioxide for photocatalysis and solar cell applications

Enhancing the MoS2/MoO3/ZnS/Zn-Heterojunction catalyst's photocatalytic performance for water organic pollutants

“…The staggered band gap arrangement [72], for which both the conduction band (CB 1 ) and valence band (VB 1 ) of one semiconductor lie either above or below the (VB 2 ) and (CB 2 ) of other semiconductors is in conformity with the present product semicondting components [70]. For example, the mainly existed MoS 2 and MoO 3 semiconductors having lower (1.2-1.9 eV) [64] and higher (2.8-3.2 eV) [65][66][67] energy gaps, respectively can be coupled with a staggerd gap arrangement shown in figure 16. As reported [73,74], this band gap arrangement yields a better results of photcatalytic activity.…”

“…As previously stated, the current material product is composed mainly of heterojunction multicomponentes, such as MoS 2 and MoO 3 having band gap values of (1.2-1.9 eV) [64] and (2.8-3.2 eV) [65][66][67], respectively, in addition to Zn metallic element. The photocatalytic activity strongly depends on the band gap arrangement of distincit semiconductor [68][69][70][71] due to its role in electron-hole separation capability.…”

Effect of copper and silver as a middle layer on the structural, electrical, photocatalytic, and optical properties of ZnS/metal/ZnS films for optoelectronics applications

“…To calculate the activation energy for a single layer of ZnS film and multilayers of ZCZ and ZAZ films, the Arrhenius relationship [48] used in the following form: where T amb is the ambient temperature, . 0 s is the pre-exponential factor, which is temperature independent, and E D is the activation energy of conduction Ln versus.…”

“…From the negative slope of Ln s ( ) verses T 1000/ in figure 12, the values of the activation energy calculated and plotted in figure 13 show the increase in activation energy value for a single layer of ZnS film under CO 2 gas flow and the decrease in it for multilayers of ZCZ, and ZAZ films, which agree with the behavior of resistivity in figure 10. This decrease in activation energy reflects the increased contribution of electronic conduction [48] which means the inverse relation between the activation energy and the electronic conduction (see figure 13).…”

“…This was the case for all the films. This demonstrates that thin films of ZnS, ZCZ, and ZAZ have photocatalytic activity that contributes to the degradation of MB [48]. The characteristic absorption peak of MB, which occurs at λ max = 660 nm, was selected so that the photocatalytic degradation of MB caused by continued exposure to UV radiation for 180 min could be demonstrated.…”