Structural evolution mechanisms of Polydopamine/CdS and photothermal effect boosted photocatalytic H2 production activity

Wang, Wei; Li, Mingyang; Xu, Huibin; Fang, Jiaojiao; Peng, Fengping; Huang, Hengming

doi:10.1016/j.apsusc.2022.154114

Cited by 9 publications

(9 citation statements)

References 41 publications

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“…Their catalyst also performed exceptionally at ≈1066 μmol h −1 g −1 (Figure 3b). [ 89 ] Similarly, Liu et al proposed a CdS@PDA@SnO 2− x nanocatalyst to exploit the chelating properties of PDA and avoid S 2− losses that lead to the oxidation of CdS. The authors reported an increase of hydrogen evolution production of 34.3 times over that of pristine CdS.…”

Section: Recent Advancements In Pda Compositesmentioning

confidence: 99%

Perspectives and Current Trends on Hybrid Nanocomposite Materials for Photocatalytic Applications

2023

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Photocatalysis can be understood as the acceleration of chemical reactions by incident light, especially when the catalyst is photoactive. These reactions are unachievable or very difficult without photoactivation. Photocatalysis could find applications in a wide range of fields such as renewable energy (water splitting, CO 2 reduction, solar fuel production) and environmental (water treatment by removing pharmaceutic and pesticides contaminant, for instance, and improving air quality by reducing volatile organic compounds [VOCs]). [1] The advance in the photocatalysis field is driven by developing novel, innovative materials that mainly allow light absorption and efficient charge separation. [2] The most developed photocatalysts are inorganic semiconductors such as metal oxides (such as ZnO, TiO 2 , WO 3 , SnO 2 , and CuO) [3,4] and chalcogenides (ZnS, CuS, CdS, Sb 2 S 3 , Cu 2 SnS 3 , and Cu 2 SnSe 3 ). [5,6] In order to enhance the performance of these semiconductor catalysts, different strategies were investigated to reduce the recombination of photogenerated electron-hole pairs and to extend the absorption edge of these catalysts to the visible region of sunlight: 1) tuning of the morphologies, 2) doping to tune the bandgap, 3) junction between several semiconductor materials, [7,8] and 4) combining with metallic and plasmonic nanomaterials (Cu, Pt, Au, Pd). [9,10] An alternative approach to increase the efficiency of these photocatalysts is the design of organic-inorganic hybrid materials. Two classes of hybrid materials were largely investigated: 1) small molecules such as dyes and molecular catalysts known for their sensitizing and photocatalytic properties, and 2) organic macromolecules or polymers are known for tuning the properties of the semiconductor. These polymers also act as a protective layer, tuning the composites' hydrophobicity/hydrophilicity or lipophilicity. Moreover, they could also provide additional photocatalytic, electron transferring, and conductive properties.Different types of polymers were investigated in the literature, such as polydopamine (PDA), polyaniline (PANI), polythiophene, poly(3-hexilthiophene) (P3HT), polyphenylenevinylenes (PPVs), poly(3,4-ethelenedioxythiophene) (PEDOT), chitosan (CS), poly(pyrrole) (PPy), polyvinyl alcohol (PVA), covalent organic polymer (COP), and covalent organic frameworks (COFs). [11] Two of the most well-established aforementioned conductive polymers are CS and PANI. Despite more than a century of ongoing research, these polymers continue to have a large and highimpact on the literature, as shown by the constantly growing research works published each year. This ever-increasing attention is primarily attributed to the extensive application of both

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Section: Recent Advancements In Pda Compositesmentioning

confidence: 99%

Perspectives and Current Trends on Hybrid Nanocomposite Materials for Photocatalytic Applications

2023

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“…The TEM image of PDA/CdS40−150 confirmed the wellcrystallized and homogeneously dispersed CdS nanoparticles, unlike our previous work that only obtained weakly crystallized CdS nanoparticles (Figure 2B). 35 The (111) interplanar crystal space of 0.335 nm ascribed to CdS can be clearly observed (inset of Figure 2B). Moreover, the SEM and TEM images show the presence of CdS nanoparticles rather than uniform nanoshells, indicating the site-selected chelation behavior between PDA and Cd 2+ .…”

Section: Resultsmentioning

confidence: 94%

“…In contrast, the CdS nanoparticles synthesized with a prechelation manner during the PDA polymerization process show only a faint absorption edge around 520 nm, indicating that the sample prepared in this study is more favorable for optical absorption and utilization. 35 The surface chemical environment of the as-synthesized samples was investigated via FTIR analysis (panels A−F of Figure 3). The photocatalytic−adsorption capacity of the samples was assessed on the basis of their RhB removal efficiency in aqueous environments.…”

Section: Resultsmentioning

confidence: 99%

Polydopamine-Mediated CdS Crystal Growth Behavior and the Synergistic Photocatalytic–Adsorption Mechanisms in Removing Rhodamine B

Wang,

Dong,

Huang

et al. 2023

Energy Fuels

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Polydopamine (PDA) is an excellent polymer with abundant chemical properties, such as broadband light absorption, surface redox activities, hydrophilic surface, chemical coupling, and adsorption capacities toward cation molecules/ions. Herein, we synthesized the PDA/CdS hybrid material by employing PDA nanoparticles as the substrate via hydrothermal reactions at various temperatures. Results indicate that the chelation between Cd2+ ions and the PDA substrate can facilitate the heterogeneous nucleation of CdS nanoparticles to obtain the uniform dispersion status on the PDA surface. PDA/CdS was then employed to study the photocatalytic–adsorption activities in removing rhodamine B (RhB), where CdS and PDA primary served as the photocatalyst and adsorption matrix, respectively, under xenon lamp irradiation. The capacity of PDA nanoparticles toward RhB adsorption is reduced along with the increased hydrothermal temperature because of an elevated carbonization degree, while the photocatalytic activity and resistance to photocorrosion of CdS nanoparticles are improved. The synergistic effect between photocatalysis and adsorption is significant for RhB removal. Finally, we demonstrate that the extremely complex surface chemical properties of PDA can infer the photocatalytic–adsorption behavior of PDA/CdS greatly by the experiments with sacrificial agents and the pre-illumination process.

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“…The above results show that the dopamine monomers change into more complex compounds owing to the presence of Cd 2+ . 25 In the XPS spectrum of N 1s for CdS@pDA shown in Fig. 3e, the N element should come from pDA.…”

Section: Resultsmentioning

confidence: 94%

Strongly coupled interface facilitating charge separation to the improved visible light-driven hydrogen production on CdS@polydopamine/NiS photocatalyst

Qin

Zhi

et al. 2023

J. Mater. Chem. A

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Structural evolution mechanisms of Polydopamine/CdS and photothermal effect boosted photocatalytic H2 production activity

Cited by 9 publications

References 41 publications

Perspectives and Current Trends on Hybrid Nanocomposite Materials for Photocatalytic Applications

Perspectives and Current Trends on Hybrid Nanocomposite Materials for Photocatalytic Applications

Polydopamine-Mediated CdS Crystal Growth Behavior and the Synergistic Photocatalytic–Adsorption Mechanisms in Removing Rhodamine B

Strongly coupled interface facilitating charge separation to the improved visible light-driven hydrogen production on CdS@polydopamine/NiS photocatalyst

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