Ligand Chemistry of Inorganic Lead Halide Perovskite Nanocrystals

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(2), P. 1152 - 1191

Published: Jan. 26, 2023

Lead halide perovskite nanocrystals (LHP NCs) have emerged as next-generation semiconductor materials with outstanding optical and optoelectronic properties. Because of the high surface-to-volume ratio, performance colloidal stability LHP NCs largely depend on their surface chemistry, especially ligands termination. On one hand, capping improve luminescence; other hand highly dynamic binding nature is detrimental to photoluminescence NCs. In addition, functionalization desired molecules induces new functionalities such chirality, light harvesting, triplet sensitization through energy/electron transfer or use X-ray detectors. this review, we present current understanding an atomic view chemistry NCs, including crystal termination, vacancies, different types ligands. Furthermore, discuss ligand-induced functionalities, photocatalysis chirality.

Language: Английский

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Selective Ethylene Glycol Oxidation to Formate on Nickel Selenide with Simultaneous Evolution of Hydrogen

Advanced Science, Journal Year: 2023, Volume and Issue: 10(15)

Published: March 22, 2023

There is an urgent need for cost-effective strategies to produce hydrogen from renewable net-zero carbon sources using energies. In this context, the electrochemical evolution reaction can be boosted by replacing oxygen with oxidation of small organic molecules, such as ethylene glycol (EG). EG a particularly interesting liquid two hydroxyl groups that transformed into variety C1 and C2 chemicals, depending on catalyst conditions. Here, demonstrated selective (EGOR) formate nickel selenide. The nanoparticle (NP) morphology crystallographic phase are tuned maximize its performance. optimized NiS electrocatalyst requires just 1.395 V drive current density 50 mA cm-2 in 1 m potassium hydroxide (KOH) EG. A combination situ infrared absorption spectroscopy (IRAS) monitor electrocatalytic process ex analysis electrolyte composition shows main EGOR product formate, Faradaic efficiency above 80%. Additionally, chemicals glycolate oxalate detected quantified minor products. Density functional theory (DFT) calculations show glycol-to-oxalate pathway favored via formation, where CC bond broken further electro-oxidized formate.

Language: Английский

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Surface functionalization of inorganic nanoparticles with ligands: a necessary step for their utility

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 52(8), P. 2573 - 2595

Published: Jan. 1, 2023

The importance of organic ligands in protecting inorganic nanoparticles and thus imparting the needed stabilization as colloidal dispersions was realised many years ago. Currently, rational preparation such with designed molecules/ligands resulting formation functional (FNPs) that are tuned for a specific application is an area immense research interest. FNPs desired requires clear understanding interactions at nanoparticle (NP)-ligand ligand-solvent interfaces, demands deep appreciation surface science coordination chemistry. In this tutorial review, we briefly explore evolution surface-ligand chemistry inform readers that, apart from surface, can modulate physico-chemical properties underlying NPs well. This review further presents design principles FNPs, where one or more ligand shells be added to thereby improving adaptability amenability NP exterior towards environment which they present, required application.

Language: Английский

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Suppressing Ion Migration of Mixed‐Halide Perovskite Quantum Dots for High Efficiency Pure‐Red Light‐Emitting Diodes

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(32)

Published: April 23, 2023

Abstract Perovskite‐based light‐emitting diodes (PeLEDs) with a mixed halide composition can be used to obtain the “pure red” emission, i.e., in 620–650 nm range, required for high‐definition displays. However, fast ion migration induces phase separation these materials under electric fields, resulting poor spectral stability and low efficiency. Herein, method producing CsPbI 3‐x Br x quantum dots (QDs) is reported which suppressed. The first achieved by anion exchange between 3 QDs hydrobromic acid (HBr), during that bromine ions efficiently passivate iodine vacancies of QDs. original oleic ligands are then exchanged 1‐dodecanethiol (1‐DT), suppresses via strong binding sulfhydryl group QD surface. PeLEDs based on exhibit pure‐red electroluminescence (EL) peak at 637 nm, maximum external efficiency (EQE) 21.8% an average value 20.4%, luminance 2653 cd m −2 , EQE decease increasing luminance. EL spectrum devices stable even 6.7 V they have half‐life 70 min initial 150 .

Language: Английский

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Ultrabright and Stable Red Perovskite Nanocrystals in Micro Light‐Emitting Diodes Using Flow Chemistry System

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

Abstract Addressing the challenges of efficiency and stability red perovskite nanocrystals is imperative for successful deployment these materials in displays lighting applications. structural dynamic changes quantum dots (PQDs) are explored using a flow chemistry system to solve above hurdles. First, ultrabright red‐emitting PQDs CsPb(Br,I) 3 achieved by adjusting ligand distribution (oleic acid oleyamine) combination with different rates equivalence ratios. The exhibit an impressive photoluminescence yield (PLQY) 95%. In addition, as mentioned numerous previous studies, severe instability mixed halide perovskites due immigration. Therefore, this paper, zinc, which has lower dissociation energy than lead utilized, reagent provide more ions synthesis enhance PQDs. As result, @Cs 4 Pb(Br,I) 6 core‐shell structure outstanding 92% PLQY obtained. simple method synthesizing paves way production micro light‐emitting diodes commercial

Language: Английский

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Magnetic Iron Nanoparticles: Synthesis, Surface Enhancements, and Biological Challenges

Processes, Journal Year: 2022, Volume and Issue: 10(11), P. 2282 - 2282

Published: Nov. 4, 2022

This review focuses on the role of magnetic nanoparticles (MNPs), their physicochemical properties, potential applications, and association with consequent toxicological effects in complex biologic systems. These MNPs have generated an accelerated development research movement last two decades. They are solving a large portion problems several industries, including cosmetics, pharmaceuticals, diagnostics, water remediation, photoelectronics, information storage, to name few. As result, more put into contact biological organisms, humans, via interacting cellular structures. situation will require deeper understanding these particles’ full impact systems, even though extensive studies been carried out different systems discussing toxicology aspects MNP used biomedical they give mixed inconclusive results. Chemical agencies, such as Registration, Evaluation, Authorization, Restriction substances (REACH) legislation for registration, evaluation, authorization materials from European Agency (ECHA), held meetings discuss issue. However, nanomaterials (NMs) being categorized by composition alone, ignoring properties possible risks that size, stability, crystallinity, morphology could bring health. Although initiatives discussed around world correct management disposal materials, thanks work researchers everywhere addressing issue related impacts concerns, new nanoethics nanosafety branch help clarify together about nanoparticles, questions than answers arisen regarding behavior wide range same tissue. The generation consolidative framework behaviors is necessary allow future applications be manageable.

Language: Английский

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From lab to field: Prussian blue frameworks as sustainable cathode materials

Dalton Transactions, Journal Year: 2024, Volume and Issue: 53(26), P. 10770 - 10804

Published: Jan. 1, 2024

Prussian blue and analogues have attracted increasing attention as versatile framework materials with a wide range of applications in catalysis, energy conversion storage, biomedical environmental fields.

Language: Английский

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Lead‐Free Perovskites with Photochromism and Reversed Thermochromism for Repeatable Information Writing and Erasing

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: July 23, 2024

Abstract Recently, novel optical information writing strategies have been developed based on fluorescent change of halide perovskites generated by light induced structural transformation. However, to date, the repeatable and erasing patterns are still a major challenge. Herein, lead‐free Cs 3 InCl 6 :Sb 3+ perovskite with photochromism reversed thermochromism is for erasing. The original synthesized modified hot‐injection method exhibits green photoluminescence (PL), which caused recombination self‐trapped excitons. After treating ultrasonication heating, PL gradually turns blue emission, related surficial Cl vacancies that or exposed due desorption surfactants. Under continuous UV irradiation, photo repairing effect, emission vanishes, color recovers green. Based this photochromic drawn exposure mask. Moreover, can again return heating at 100 °C. Thus, photochromism‐induced be simply erased effect. Therefore, thermal erasure demonstrated reversible .

Language: Английский

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How viable are MXenes? Recent developments of MXene synthesis and its application in solid-state electrolytes

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 84, P. 110868 - 110868

Published: Feb. 14, 2024

Language: Английский

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Perovskite Paradigm Shift: A Green Revolution with Lead-Free Alternatives in Photocatalytic CO₂ Reduction

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(4), P. 1932 - 1975

Published: April 4, 2024

Carbon dioxide (CO2), an archetypal greenhouse gas, can be transformed into valuable fuels through photocatalysis, presenting auspicious avenue for combating global climate change and energy crisis. While halide perovskites have sparked substantial research interest, concerns over lead toxicity spurred exploration of their lead-free counterparts CO2 photoreduction. This comprehensive Review navigates the fundamentals reduction, delving basic principles, mechanisms, relevant operando techniques. It then introduces diverse structures (LFHPs), synthesis methodologies, intrinsic properties that render them suitable Subsequently, unfolds application modification strategies light-driven conversion, highlighting breakthroughs shedding light on potential mechanisms. Finally, current challenges to tailor LFHPs robust photocatalytic reduction are critically discussed, offering insights future in this realm. aims illuminate path toward sustainable bridging knowledge gaps inspiring innovations a greener carbon-neutral tomorrow.

Language: Английский

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