Constructing Bipolar Dual‐Active Sites through High‐Entropy‐Induced Electric Dipole Transition for Decoupling Oxygen Redox

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(26)

Published: April 11, 2024

Abstract It remains a significant challenge to construct active sites break the trade‐off between oxidation and reduction processes occurring in battery cathodes with conversion mechanism, especially for oxygen evolution reactions (ORR/OER) involved zinc‐air batteries (ZABs). Here, using high‐entropy‐driven electric dipole transition strategy activate stabilize tetrahedral is proposed, while enhancing activity of octahedral through orbital hybridization FeCoNiMnCrO spinel oxide, thus constructing bipolar dual‐active high‐low valence states, which can effectively decouple ORR/OER. The high‐entropy oxide severe lattice distortion, exhibits strong 1s→4s intense t 2g (Co)/e g (Ni)‐2p(O L ) that regulates electronic descriptors, e , leads formation low‐valence Co (Co th high‐valence Ni (Ni oh ), resulting higher half‐wave potential 0.87 V on lower overpotential 0.26 at 10 mA cm −2 as well superior performance ZABs compared low/mild entropy oxides. Therefore, engineering presents distinctive approach designing catalytic by inducing novel electromagnetic properties materials across various electrocatalytic reactions, particularly decoupling systems.

Language: Английский

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Annual research review of perovskite solar cells in 2023

Materials Futures, Journal Year: 2024, Volume and Issue: 3(2), P. 022102 - 022102

Published: April 24, 2024

Abstract Perovskite (PVK) solar cells (PSCs) have garnered considerable research interest owing to their cost-effectiveness and high efficiency. A systematic annual review of the on PSCs is essential for gaining a comprehensive understanding current trends. Herein, analysis papers reporting key findings in 2023 was conducted. Based results, were categorized into six classifications, including regular n–i–p PSCs, inverted p–i–n PVK-based tandem cells, PVK modules, device stability, lead toxicity green solvents. Subsequently, detailed overview summary advancements within each classification presented. Overall, this serves as valuable resource guiding future endeavors field PSCs.

Language: Английский

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Lattice Expansion in Rb-Doped Hybrid Organic–Inorganic Perovskite Crystals Resulting in Smaller Band-Gap and Higher Light-Yield Scintillators

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(23), P. 8892 - 8902

Published: May 26, 2023

Two-dimensional hybrid-organic-inorganic perovskite (2D-HOIP) lead bromide crystals have demonstrated great potential as scintillators with high light yields and fast decay times while also being low cost solution-processable materials for wide energy radiation detection. Ion doping has been shown to be a very promising avenue improvements of the scintillation properties 2D-HOIP crystals. In this paper, we discuss effect rubidium (Rb) on two previously reported single crystals, BA2PbBr4 PEA2PbBr4. We observe that Rb ions leads an expansion crystal lattices materials, which narrowing band gaps down 84% pure compounds. PEA2PbBr4 shows broadening in photoluminescence emissions both faster γ-ray times, 4.4 ns, average time decreases 15% 8% Rb-doped PEA2PbBr4, respectively, compared those undoped The inclusion slightly longer afterglow, residual still below 1% after 5 s at 10 K, yield perovskites is significantly increased by 58% 25% respectively. This work significant enhancement performance, particular significance timing applications, such photon counting or positron emission tomography.

Language: Английский

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Micronuclear battery based on a coalescent energy transducer

Nature, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 18, 2024

Language: Английский

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Octahedral units in halide perovskites

Nature Reviews Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 10, 2025

Language: Английский

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Point defect-mediated hot carrier relaxation dynamics of lead-free FASnI₃ perovskites

Nanoscale, Journal Year: 2024, Volume and Issue: 16(9), P. 4737 - 4744

Published: Jan. 1, 2024

In search of a promising optoelectronic performance, we herein investigated the hot carrier relaxation dynamics lead-free cubic phased bulk formamidinium tin triiodide (FASnI 3 ) perovskite.

Language: Английский

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Eliminating Non‐Corner‐Sharing Octahedral for Efficient and Stable Perovskite Solar Cells

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(28)

Published: Jan. 30, 2024

Abstract The metal halide ( BX 6 ) 4‐ octahedron, where B represents a cation and X anion, is regarded as the fundamental structural functional unit of perovskites. However, influence way 4− octahedra connect to each other has on stability optoelectronic properties perovskite still unclear. Here, octahedral connectivity, including corner‐, edge‐, face‐sharing, various Cs x FA 1‐x PbI 3 (0 ≤ 0.3) films tuned reliably characterized through compositional additive engineering, with ultralow‐dose transmission electron microscopy. It found that overall solar cell device performance, charge carrier lifetime, open‐circuit voltage, current density–voltage hysteresis are all improved when consist corner‐sharing octahedra, non‐corner sharing phases suppressed, even in same chemical composition. Additionally, it structural, optoelectronic, performance stabilities similarly enhanced non‐corner‐sharing connectivities suppressed. This approach, combining macroscopic tests microscopic material characterization, provides powerful tool enabling thorough understanding impact connectivity opens new parameter space for designing high‐performance photovoltaic devices.

Language: Английский

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The key role of methylenediammonium and tetrahydrotriazinium in the phase stability of FAPbI3

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 124(19)

Published: May 6, 2024

Formamidinium lead triiodide (FAPbI3) is the prime candidate for single-junction perovskite solar cells, despite metastability of phase. To improve its ambient-phase stability and produce world-record photoelectric conversion efficiencies, methylenediammonium (MDA) has been used as an additive in FAPbI3. However, exact function role MDA are still uncertain. The doping may exist lattice either original structure or THTZ-H (tetrahydrotriazinium) structure. In this research, effects FAPbI3 on explored by first-principles calculations. Both can from a structural perspective due to strain stronger H–I bonds. mechanisms differ significantly terms electronic properties. acts traditional passivation mechanism. It eliminate iodine interstitial defect states that trap charge carriers inhibit migration. cation directly contribute band edge construction bulk. Electron delocalization π-conjugated ring lowered frontier orbital separation organic molecule enabled overlap with inorganic moiety. in-depth understanding mechanism improving study would facilitate application optoelectronic devices.

Language: Английский

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Stabilizing Lead Halide Perovskites via an Organometallic Chemical Bridge for Efficient and Stable Photovoltaics

ACS Nano, Journal Year: 2024, Volume and Issue: unknown

Published: July 17, 2024

Defects around the surface and grain boundaries of perovskite films normally cause severe nonradiative recombination imbalanced charge carrier transport, further limiting both efficiency stability solar cells (PSCs). To tackle this critical issue, we propose a chemical bridge strategy to reconstruct interface using organometallic molecules. The commercially available molecule bis(diphenylphosphino)ferrocene (FcP2), with unique molecular structure, anchors chelates Pb atoms by forming strong Pb-P bonds passivates surfaces boundaries. Detailed characterization revealed that FcP2 reconstruction can effectively suppress recombination, electron delocalization properties ferrocene core achieve more balanced interfacial transport. resultant N-i-P PSC device outputs close 25% together one best reported operational stabilities, maintaining over 95% initial after 1000 h continuous operation at maximum power point under 1-sun illumination.

Language: Английский

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Role of A-Site Cation Hydrogen Bonds in Hybrid Organic–Inorganic Perovskites: A Theoretical Insight

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: unknown, P. 802 - 810

Published: Jan. 15, 2025

Hybrid organic-inorganic halide perovskites (HOIPs) have garnered a significant amount of attention due to their exceptional photoelectric conversion efficiency. However, they still face considerable challenges in large-scale applications, primarily instability. One key factor influencing this instability is the lattice softness attributed A-site cations. In study, we investigated effects four different cations (MA, FA, EA, and GA) on by using combination ab initio molecular dynamics first-principles calculations. Our results demonstrate that an increase number hydrogen bonds for correlates with enhanced atomic fluctuations, resulting reduction bulk modulus softness. The strength bonding cation increases rotational energy barrier cation, along formation kinetic coupling between [PbI6]4- octahedron. Consequently, lifetime enhances rigidity perovskite lattice. Notably, found EA cations, which exhibit stronger fewer total bonds, can limit rotation inhibit rocking motion octahedron, thereby inherently soft lattice, ultimately enhancing stability material. findings elucidate effect perovskites, providing valuable theoretical insights design more stable HOIPs.

Language: Английский

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