Comparative Study of the Photocatalytic Hydrogen Evolution over Cd1−xMnxS and CdS-β-Mn3O4-MnOOH Photocatalysts under Visible Light

Potapenko, K. O.; Kurenkova, Anna Yu.; Bukhtiyarov, Andrey V.; Gerasimov, Evgeny Yu.; Cherepanova, Svetlana V.; Kozlova, Ekaterina A.

doi:10.3390/nano11020355

Cited by 8 publications

(3 citation statements)

References 42 publications

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“…For example, most The addition of earth-abundant metals has a positive effect, in particular in the case of Ni [95] and Cu [96,97]. A high activity in hydrogen evolution under visible light has been demonstrated also for solid solutions of cadmium and manganese sulfides, due to their valence and conduction band position tuning, and for composite photocatalysts, CdS-β-Mn 3 O 4 -MnOOH, due to the ternary heterojunction formation [98]. Although reasonable research progress has been accomplished on the design of photocatalysts with high-conversion efficiency, there are still some issues to be addressed.…”

Section: Photocatalytic Methodsmentioning

confidence: 99%

Main Hydrogen Production Processes: An Overview

et al. 2021

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Due to its characteristics, hydrogen is considered the energy carrier of the future. Its use as a fuel generates reduced pollution, as if burned it almost exclusively produces water vapor. Hydrogen can be produced from numerous sources, both of fossil and renewable origin, and with as many production processes, which can use renewable or non-renewable energy sources. To achieve carbon neutrality, the sources must necessarily be renewable, and the production processes themselves must use renewable energy sources. In this review article the main characteristics of the most used hydrogen production methods are summarized, mainly focusing on renewable feedstocks, furthermore a series of relevant articles published in the last year, are reviewed. The production methods are grouped according to the type of energy they use; and at the end of each section the strengths and limitations of the processes are highlighted. The conclusions compare the main characteristics of the production processes studied and contextualize their possible use.

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Section: Photocatalytic Methodsmentioning

confidence: 99%

Main Hydrogen Production Processes: An Overview

et al. 2021

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“…Cadmium–zinc sulfides are the widely studied photocatalysts [ 8 ]. As for cadmium–manganese sulfides, it was recently shown that they also exhibit high photocatalytic activity [ 9 , 10 , 11 , 12 , 13 ]. Unlike zinc cations, Mn 2+ cations can be easily oxidized by photogenerated holes to the oxidation state of 3+; thus, the mechanism of the action of (Cd,Zn)S and (Cd,Mn)S photocatalysts may differ.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we analyzed the structure and morphology of Cd 1−x Mn x S (x~0.3) nanoparticles in composite photocatalysts, which are active during the decomposition of water to produce hydrogen [ 12 , 13 ]. The investigation was made by X-ray diffraction via the Debye Function Analysis.…”

Section: Introductionmentioning

confidence: 99%

(Cd,Mn)S in the Composite Photocatalyst: Zinc Blende and Wurtzite Particles or Integrowth of These Two Modifications?

Cherepanova

Kozlova

2023

Materials

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In this study, the crystalline structure and particle shape of Cd1−xMnxS (x~0.3) in the composite photocatalysts prepared by hydrothermal synthesis at different temperatures (T = 80, 100, 120, and 140 °C) were analyzed. Along with mixed Cd–Mn sulfide, the catalysts contain a small amount of β-Mn3O4. XRD patterns of (Cd,Mn)S have features inherent to both cubic zinc blende and hexagonal wurtzite structure. Moreover, XRD peaks are anisotropically broadened. First, the heterogeneous (or two-phased) model was considered by the commonly used Rietveld method. Phase ratio, average crystallite sizes, and strains for both phases were formally determined. However, it was shown that this model is not correct because relatively narrow and broad peaks cannot be fitted simultaneously. Then, the homogeneous model was tested by Debye Function Analysis. This model assumes that particles are statistically homogeneous, but each particle contains lamellar intergrowth of zinc blende and wurtzite modifications. The probability of stacking faults, as well as the average radii of spherical and ellipsoidal particles, were varied. It was shown that nanocrystalline Cd0.7Mn0.3S particles have an ellipsoidal shape. Ellipsoids are elongated along the direction normal to the plane of defects. An increase in the hydrothermal synthesis temperature from 80°C to 140°C leads to an enlargement of particles and a gradual decrease in the probability of stacking faults in the wurtzite structure from 0.47 to 0.36. Therefore, with increasing temperature, the structure of (Cd,Mn)S nanoparticles transforms from almost random polytype cubic/hexagonal (ZB:WZ = 47:53) to a preferably hexagonal structure (ZB:WZ = 36:64). Mn2+ ions facilitate CdS phase transformation from zinc blende to wurtzite structure. There is no direct correlation between the structure and photocatalytic activity.

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