Plasmonic–perovskite solar cells, light emitters, and sensors

Microsystems & Nanoengineering, Journal Year: 2022, Volume and Issue: 8(1)

Published: Jan. 12, 2022

Abstract The field of plasmonics explores the interaction between light and metallic micro/nanostructures films. collective oscillation free electrons on surfaces enables subwavelength optical confinement enhanced light–matter interactions. In optoelectronics, perovskite materials are particularly attractive due to their excellent absorption, emission, carrier transport properties, which lead improved performance solar cells, light-emitting diodes (LEDs), lasers, photodetectors, sensors. When coupled with plasmonic structures, device significantly improves owing strong near-field far-field enhancements, as well plasmoelectric effect. Here, we review recent theoretical experimental works emitters, underlying physical mechanisms, design routes, performances, optimization strategies summarized. This also lays out challenges future directions for research toward next-generation optoelectronic technologies.

Language: Английский

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In Situ Synthesis of Lead-Free Halide Perovskite–COF Nanocomposites as Photocatalysts for Photoinduced Polymerization in Both Organic and Aqueous Phases

ACS Materials Letters, Journal Year: 2022, Volume and Issue: 4(3), P. 464 - 471

Published: Feb. 7, 2022

A critical challenge that hinders the application of perovskite materials is their instability toward water and light. Herein, we report lead-free bismuth halide nanocrystals encapsulated by covalent organic frameworks (PNCs–COFs) via an in situ growth approach. The PNCs–COFs nanocomposites demonstrated good processability originates from hydrophobic COFs shell. Furthermore, coating enables formation heterojunction, which facilitates generation transportation photoinduced charge carriers. were further applied as photocatalysts for free-radical polymerizations, photoactivating different coinitiators both hole electron transfer mechanisms aqueous phases. excellent photocatalytic performance was confirmed high monomer conversion (up to 97.5%), diverse functional group tolerance recyclability.

Language: Английский

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Control of selectivity in organic synthesis via heterogeneous photocatalysis under visible light

Deleted Journal, Journal Year: 2022, Volume and Issue: 1, P. e9120006 - e9120006

Published: May 12, 2022

Organic synthesis driven by heterogeneous catalysis is a central research theme to both fundamental and industrial production of fine chemicals. However, the employment stoichiometric strong oxidizing or reducing reagents (e.g., K₂Cr₂O₇ LiAlH₄) harsh reaction conditions high temperature pressure) always leads products overreaction other by-product residues salt acid waste). Thus poor control product selectivity tremendous energy consumption result in urgent demand develop novel technologies for catalysis. Given current global development CO₂ reduction sustainable utilization, one promising protocol photocatalysis. It enables solar-to-chemical conversion under mild room temperature, ambient pressure, air as oxidant) offers unique pathways improved control. To accurately tailor desired products, electronic structure positions valence-band maximum conduction-band minimum), geometric nanorod, nanosheet, porous morphology), surface chemical micro-environment vacancy sites co-catalysts) photocatalysts require rational design construction. In this review, we will briefly analyze some effective photocatalytic systems with excellent regulation ability organic transformations (mainly oxidation types) visible light irradiation, put forward opinions on optimal fabrication nanostructured realize selective synthesis.

Language: Английский

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Stabilization and Performance Enhancement Strategies for Halide Perovskite Photocatalysts

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(6)

Published: July 28, 2022

Abstract Solar‐energy‐powered photocatalytic fuel production and chemical synthesis are widely recognized as viable technological solutions for a sustainable energy future. However, the requirement of high‐performance photocatalysts is major bottleneck. Halide perovskites, category diversified semiconductor materials with suitable energy‐band‐enabled high‐light‐utilization efficiencies, exceptionally long charge‐carrier‐diffusion‐length‐facilitated charge transport, readily tailorable compositional, structural, morphological properties, have emerged new class efficient hydrogen evolution, CO 2 reduction, various organic reactions. Despite noticeable progress, development halide perovskite (HPPs) still hindered by several key challenges: strong ionic nature high hydrolysis tendency induce instability an unsatisfactory activity due to need coactive component realize redox processes. Herein, recently developed advanced strategies enhance stability HPPs comprehensively reviewed. The applicable enhancement first articulated, improvement then explored. Finally, challenges future perspectives associated application in fuels value‐added chemicals presented, indicating irreplaceable role field photocatalysis.

Language: Английский

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Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(6), P. 3678 - 3688

Published: Feb. 23, 2022

Catalytic ozonation of methyl mercaptan (CH3SH) can effectively control this unbearable odorous sulfur-containing volatile organic compound (S-VOC). The construction an electronic metal–support interaction (EMSI) coordination structure to maximize the number active sites and increase intrinsic activity is effective means improve catalytic performance. In work, abundant Si–OH groups on PSBA-15 (SBA-15 before calcination) were used anchor Mn form a Si–O–Mn-based EMSI structure. Detailed characterizations theoretical simulations reveal that strong effect significantly adjusts stabilizes 3d states, resulting in electron-rich center Si–O–Mn bond promote specific adsorption/activation ozone (O3) electron-poor (Si–O−)Mn–O adsorb large amount CH3SH accompanied by its own oxidative degradation. situ Raman Fourier transform infrared (FTIR) analyses identify over 3.0Mn-PSBA generates atomic oxygen species (AOS/*O) reactive (ROS/•O2–) achieve efficient decomposition into CO2/SO42–. Furthermore, electrons obtained from centers are transferred maintain redox cycle Mn2+/3+ → Mn4+ through internal bridge, thus accomplishing stable degradation prolonged 180 min. Therefore, rational design catalysts with optimized inherent via provide significant potential performance eliminate gases.

Language: Английский

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Recent Progress and Challenges of Bismuth‐Based Halide Perovskites for Emerging Optoelectronic Applications

Advanced Optical Materials, Journal Year: 2022, Volume and Issue: 11(3)

Published: Dec. 3, 2022

Abstract Recently, metal halide perovskites have attracted extensive attentions owing to their superior optoelectronic properties in various device applications, such as solar cells, photodetectors, light‐emitting diodes, lasing, photocatalysis, etc. Up now, the state‐of‐the‐art developments of perovskite‐based devices are most using lead‐halide perovskite system. However, presence lead (Pb) these devices, which is insidious bioaccumulative hazard human bodies, and a poor stability against light, heat, humidity hamper practical applications future commercialization. Therefore, scientific community searching for low‐toxicity environmental‐friendly lead‐free perovskite‐type materials back‐up strategy. Among possible Pb‐substitution strategies, trivalent bismuth cation (Bi 3+ ) possesses same electronic configuration Pb 2+ , some emerging Bi‐based derivatives experimentally characterized, exhibit comparable Pb‐based perovskites. In this review, comprehensive overview currently explored reported, with an emphasis on synthesis methods, structural diversity, photophysical properties, current potential categories. Finally, review finished critical outlook into challenges development prospects toward versatile applications.

Language: Английский

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Synthetic Application of Bismuth LMCT Photocatalysis in Radical Coupling Reactions

ACS Catalysis, Journal Year: 2023, Volume and Issue: 13(2), P. 1125 - 1132

Published: Jan. 9, 2023

Ligand-to-metal charge transfer (LMCT) photocatalysis allows the activation and synthetic utilization of halides other heteroatoms in metal complexes. Many metals are known to undergo LMCT but so far remain underutilized field catalysis. A screening assay identifying activity helped us expand this catalysis concept application bismuth organic radical coupling reactions. We demonstrate its for generation two different radicals (chlorine carboxyl) net-oxidative as well redox-neutral photochemical Detailed investigation model Giese-type revealed BiCl4– BiCl52– catalytically active species under 385 nm irradiation. Combined cyclic voltammetry UV–vis studies gave insight into reactivity highly reactive bismuth(II) catalyst fragment.

Language: Английский

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CsPbBr₃/Polyoxometalate Composites for Selective Photocatalytic Oxidation of Benzyl Alcohol

ACS Catalysis, Journal Year: 2023, Volume and Issue: 13(21), P. 14346 - 14355

Published: Oct. 24, 2023

Selective oxidation of benzyl alcohols to the corresponding carbonyl compounds is great importance for providing versatile intermediates synthesis pharmaceuticals and fine chemicals. In this work, we constructed a CsPbBr3/[Ni4(H2O)2(PW9O34)2]10– (CsPbBr3/Ni4P2) composite by integrating visible light-responsive ability CsPbBr3 multielectron-transfer polyoxometalates. The resulting CsPbBr3/Ni4P2 exhibited good photocatalytic activity toward selective conversion alcohol benzaldehyde with ∼100% selectivity. Mechanistic studies revealed that tetra-nickel-substituted polyoxotungstate, Ni4P2, played crucial roles in separation/migration utilization photogenerated charge carries due its well-matched energy level distinctive electron/proton-transferring as redox shuttle. Multiple scavenging experiments confirmed electrons (e–), holes (h+), •O2–, 1O2 were key reactive species efficient photocatalysis.

Language: Английский

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Photocatalytic toluene oxidation with nickel-mediated cascaded active units over Ni/Bi2WO6 monolayers

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: May 31, 2024

Abstract Adsorption and activation of C–H bonds by photocatalysts are crucial for the efficient conversion to produce high-value chemicals. Nevertheless, delivery surface-active oxygen species bond oxygenation inevitably needs overcome obstacles due separated active centers, which suppresses catalytic efficiency. Herein, Ni dopants introduced into a monolayer Bi 2 WO 6 create cascaded units consisting unsaturated W atoms Bi/O frustrated Lewis pairs. Experimental characterizations density functional theory calculations reveal that these special sites can establish an controllable oxidation process. The activated on readily transferred oxygenation. catalyst with mass fraction 1.8% exhibits excellent toluene rates high selectivity towards benzaldehyde. This study presents fascinating strategy through design units.

Language: Английский

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Solar‐Driven Selective Oxidation Over Bismuth‐Based Semiconductors: From Prolific Catalysts to Diverse Reactions

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(27)

Published: March 4, 2024

Abstract Synthesis of organic compounds often necessitates rigorous reaction conditions or the involvement hazardous oxidants, resulting in substantial energy consumption and considerable environmental damage. Photocatalytic selective oxidation represents a green environmentally friendly way to obtain high‐value chemicals, which has developed rapidly recent years. Bismuth‐based (Bi‐based) semiconductor materials have gained intense interest synthesis due their diverse crystal structures compositions, tunable band structure, outstanding photocatalytic performance. Herein, systematic summary solar‐driven over varieties Bi‐based semiconductors is provided. Initially, reactive species involved oxidation, widely used methods for synthesizing these are meticulously classified. Concerning reactions, variety modification strategies, with focus on separation photogenerated carriers regulation extensively documented. Highlights applications mechanism discussions photocatalysts including alcohol C─H bond activation, amine sulfide as well coupling reactions photoreduction. Finally, future development prospects challenges field proposed, hoping provide valuable insights guidance design oxidation.

Language: Английский

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