INORGANIC CHEMISTRY
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2022
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IF 5.436
Ying Long,Xuehua Dong,Hongmei Zeng,Zhien Lin,Guohong Zou
A novel alkali metal lead halide nitrate, Cs2Pb(NO3)2Br2, has been successfully synthesized via a hydrothermal method. Interestingly, the title compound features a distinctive Ruddlesden–Popper perovskite-like layered structure, which induces the outstanding multifunctional optical properties, including a large birefringence (0.147@546 nm) and broad light-orange emission. Detailed structural analysis and theoretical calculations revealed that the large birefringence originates from the p−π interaction between the Pb2+ cations and NO3 groups and that the excellent luminescence properties derive from the distortion of PbO4Br4 polyhedra. This work not only enriches the variant structure types of layered perovskites but also guides the further exploration of all-inorganic multifunctional optical materials.
研究领域:
材料科学
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光学材料
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无机化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.5
Qiang Xue,Guangjun Zhang,Ting Chen,Guozhu Zheng,Chenxiao Wang,Zichen Zhuang,Kui Liu,Yucun Zhou,Lang Xu,shaorong wang
Overcoming sluggish oxygen reduction and evolution reaction kinetics remains a fundamental challenge in developing high-performance air electrodes for reversible protonic ceramic cells (RPCCs). Herein, we present an innovative approach combining high-entropy engineering with self-assembly processes to fabricate a thermally derived composite electrode Pr 0.4 Sr 0.4 Nd 0.4 La 0.4 Gd 0.4 Co 0.5 Ni 0.5 O 4+δ (PSNLGCN). This unique architecture consists of Pr-deficient Pr 0.4-x Sr 0.4 Nd 0.4 La 0.4 Gd 0.4 Co 0.5 Ni 0.5 O 4+δ matrix and exsolved Pr 6 O 11 nanoparticles. The high-entropy design ensures exceptional structural stability through configurational entropy stabilization, while the in-situ formed Pr 6 O 11nanoparticles significantly enhance electrocatalytic activity by providing abundant active sites for oxygen reactions. The RPCC with the PSNLGCN air electrode demonstrates remarkable performance, attaining a peak power density (PPD) of 1.1 W cm -2 in fuel cell (FC) mode and a current density of -2.9 A cm -2 at 1.3 V in electrolysis cell (EC) mode at 700 ℃. More importantly, the cells exhibit outstanding durability, maintaining stable operation for 200 h in FC mode, 130 h in EC mode, and 100 h under reversible cycling conditions at 600 ℃. This work establishes a novel materials design paradigm for developing RPCC air electrodes that simultaneously achieve superior electrocatalytic performance and operational stability.
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高影响因子
Journal of Physical Chemistry Letters
·
2025
·
IF 4.6
Qilin Wei,Tongtong Kou,Tong Chang,Liang Wang,Xinxin Han,William W. Yu
Ruddlesden−Popper phases Cs2CdCl4 and Cs3Cd2Cl7 are widely used in experimental research of optoelectronics due to their excellent doping matrix properties, but their optoelectronic mechanisms have not been fully explored. This study uses first-principles calculations and experiments to analyze the differences in point defect crystal growth and optoelectronic properties caused by Sb doping of these two materials. Sb tends to replace the position of Cd in both structures. Additional doping energy levels are introduced in the Sb doping of Cs2CdCl4, and the flat band edge increases the local charge density and improves the electron-hole recombination efficiency. The photoluminescence quantum yield (PLQY) of 0.1% Sb:Cs2CdCl4 doping is as high as 79.09%. Molecular dynamics simulations show that the octahedral distortion of [SbCl6]3– in Cs2CdCl4 is highly sensitive to temperature, and the Jahn–Teller distortion causes the formation of self-trapped excitons, which is more conducive to the generation of exciton recombination luminescence. In contrast, Sb doping of Cs3Cd2Cl7 produces a lower PLQY, which can be explained by the more delocalized charge distribution at its band edges and the lower octahedral structural distortion. Sb:Cs2CdCl4 exhibits high-performance X-ray imaging capabilities. This work provides valuable insights and guidance for optimizing Sb-doped Cd-based optoelectronic materials.
研究领域:
光电材料
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材料科学
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凝聚态物理
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计算材料学
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X射线成像技术
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DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2025
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IF 4.1
Junling Meng,Wan Huang,Meijing Lu,Jingxuan Cao,Na Xu,Lina Zhao
In recent years, the in-situ exsolution of metal nanoparticles from the anodic oxide framework through reduction treatment has emerged as an effective strategy to boost electrochemical performance by increasing active sites and facilitating charge transfer. However, this approach is primarily restricted to simple perovskite structures. The development of novel and more efficient oxide matrices for the controlled desorption of high-density metal catalysts remains a significant challenge. In this study, Ruddlesden-Popper (RP) type layered oxides Pr 2 NiO 4 and Pr 3 Ni 2 O 7 were innovatively employed as new primary matrices with the objective of achieving controllable exsolution of nickel metal nanoparticles by leveraging their unique layered architecture. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses confirmed that following reduction treatment, Ni nanoparticles were successfully exsolved in situ from the oxide surface, with a notably higher density of Ni nanoparticles observed for Pr 3 Ni 2 O 7 . Electrochemical tests show that after 3 h of reduction at 850 °C, the cell with Pr 3 Ni 2 O 7 anode can achieve a peak power density of 969.7 mW cm −2 . Furthermore, when employed the studied compounds as anode materials, they showed negligible performance degradation after 100-h operation at 700 °C under 300 mA cm −2 current density. Furthermore, SEM characterization provided additional verification of the experimental results. This research not only underscores the considerable potential of RP phase oxides as high-performance SOFC anode materials but also offers new insights into future developments in SOFC anodes by adjusting RP phase sequences to regulate nanoparticle density effectively.
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高影响因子
ADVANCED MATERIALS
·
2019
·Vol. 31
·期 42
·1903889
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IF 25.809
Guangbao Wu,Xing Li,Jiyu Zhou,Jianqi Zhang,Xuning Zhang,Xuanye Leng,Peijun Wang,Ming Chen,Dongyang Zhang,Kui Zhao,Shengzhong (Frank) Liu,Huiqiong Zhou,Yuan Zhang
Layered Ruddlesden–Popper (RP) phase (2D) halide perovskites have attracted tremendous attention due to the wide tunability on their optoelectronic properties and excellent robustness in photovoltaic devices. However, charge extraction/transport and ultimate power conversion efficiency (PCE) in 2D perovskite solar cells (PSCs) are still limited by the non-eliminable quantum well effect. Here, a slow post-annealing (SPA) process is proposed for BA 2 MA 3 Pb 4 I 13 ( n = 4) 2D PSCs by which a champion PCE of 17.26% is achieved with simultaneously enhanced open-circuit voltage, short-circuit current, and fill factor. Investigation with optical spectroscopy coupled with structural analyses indicates that enhanced crystal orientation and favorable alignment on the multiple perovskite phases (from the 2D phase near bottom to quasi-3D phase near top regions) is obtained with SPA treatment, which promotes carrier transport/extraction and suppresses Shockley–Read–Hall charge recombination in the solar cell. As far as it is known, the reported PCE is so far the highest efficiency in RP phase 2D PSCs based on butylamine (BA) spacers ( n = 4). The SPA-processed devices exhibit a satisfactory stability with <4.5% degradation after 2000 h under N 2 environment without encapsulation. The demonstrated process strategy offers a promising route to push forward the performance in 2D PSCs toward realistic photovoltaic applications.
研究领域:
光伏技术
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材料科学
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钙钛矿太阳能电池
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薄膜光电子学
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晶体工程
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DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 36
·12392-12399
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IF 6.4
Liting Tao,Wei Tang,Minxing Yan,Li Ding,Jiajun Wei,Lixiang Wang,Liqi Li,Linjun Li,Deren Yang,Yanjun Fang
2D Ruddlesden–Popper perovskites with chiral organic ligands are emerging as promising candidates for circularly polarized light (CPL) detection, which has important applications in quantum communication and opto-spintronics. However, the insulating organic spacers in 2D perovskites generally hinder carrier transport and charge extraction, hence leading to a low responsivity of photodetectors. Herein, we have prepared a chiral-2D/3D perovskite heterojunction thin film via intermittent spin-coating of the chiral-2D ligands on top of a 3D perovskite film. The chiral-2D perovskite formed on top of the film functions as the CPL absorption layer, while the energy transfer between chiral-2D and 3D perovskites and the dissociation of excitons in the 3D phase facilitate the efficient lateral carrier transport and extraction in the bottom 3D perovskite-based charge transport channel. The resultant heterojunction CPL detectors exhibit a high anisotropy factor of 0.13 and a large specific detectivity of above 6.8 × 1010 Jones that significantly outperform those of the pure chiral-2D based ones, which paves the way for the design and preparation of high performance perovskite thin film-based CPL detectors.
研究领域:
材料科学
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光电子学
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光子学
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纳米技术
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DOI
高影响因子
CHEMISTRY OF MATERIALS
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2021
·
IF 9.811
Feiyi Lyu,Xiaoqi Zheng,Ziyue Li,Zhuo Chen,Ruowen Shi,Zefeng Wang,Haiming Liu,Bo-Lin Lin
The motion of organic cations and its possible correlation with excited-state photodynamics are important to the fundamental understanding of the superior performances of two-dimensional (2D) and three-dimensional (3D) hybrid lead-halide perovskites in optoelectronic applications. Herein, variable-temperature (VT) solid-state 1H and 13C CP (cross polarization) NMR spectroscopy without isotope enrichments, combined with VT powder X-ray diffraction (XRD), differential scanning calorimetry (DSC), and time-resolved photoluminescence (TRPL), was employed to study the phase transition, local structure, motion dynamics, and photodynamic behaviors of organic cations in hybrid 2D Ruddlesden–Popper perovskites (RPPs) (BA)2(MA)n−1PbnI3n+1 (BA denotes butylammonium and MA denotes methylammonium). Two types of BA conformations in various crystalline phases of 2D RPPs and conformational transition associated with phase transition were clearly revealed. Quantitative NMR analyses suggest that the rotation dynamics of MA in 2D RPPs are comparable to that of MA in 3D MAPbI3. A surprising linear relationship was discovered between the estimated activation energy of the MA rotation and the logarithm of photoluminescence (PL) lifetimes (τ) of 2D RPPs and MAPbI3, strongly supporting the presence of coupling between the cation spatial dynamics and the excited-state photodynamic behaviors.
研究领域:
材料科学
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光电学
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固体物理
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化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Hualin Zheng,Ting Zhang,Yafei Wang,Canzhou Li,Zhenhuang Su,Ze Wang,Hao Chen,Shihao Yuan,Yiding Gu,Long Ji,Jian Li,Shibin Li
Despite two-dimensional (2D) Ruddlesden–Popper-phase layered perovskites (RPLPs) exhibiting excellent environmental stability, most solar cells based on 2D RPLP films are fabricated in a controlled inert atmosphere. Meanwhile, the poor charge transport of 2D RPLP films owing to the unfavorable phase arrangement and defects limits the efficiency of 2D RPLP solar cells. Here, we fabricate high-efficiency 2D RPLP solar cells in ambient air assisted by a zwitterion (ZW) additive. We show that the ZW additive suppresses the formation of the bottom 2D phases (n ≤ 2) and the top 3D-like phases in 2D RPLP films. These 2D phases usually grow parallel to the substrate and act as trap sites that inhibit charge transport in the vertical direction. The 3D-like phases, on the other hand, aggravate the long-term stability due to the intrinsic instability of MA+ cations. With improved phase distribution, crystal orientation, and reduced trap states in 2D RPLP films, efficient charge transport is obtained. Finally, a record-high open-circuit voltage (Voc) of 1.19 V and a power conversion efficiency of 17.04% with an enhanced stability are achieved for (BA0.9PEA0.1)2MA3Pb4I13-based (n = 4) solar cells fabricated under high humidity (∼65% RH).
研究领域:
材料科学
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太阳能
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纳米技术
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化学
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DOI
PubMed
高影响因子
Nano Energy
·
2023
·
IF 17.6
Tao Wang,Daming Zheng,Karol Vegso,Nada Mrkyvkova,Peter Siffalovic,Xiaocong Yuan,Michael G. Somekh,Laurent Coolen,Thierry Pauporte,Feng Fu
Metal halide perovskites are attracting increasing attention as photodetectors (PDs) materials due to their excellent photoelectric properties. However, integrating perovskite to realize high-resolution perovskite pixel arrays remains critical to enable practical devices. Herein, we demonstrate a high-responsivity and stable 10 × 10 flexible PDs array based on formamidinium-based quasi-2D Ruddlesden-Popper (BA) 2 FAPb 2 I 7 (n = 2) (BA= butylammonium, C 4 H 9 NH 3 + ) perovskite elements for image sensing. The high-performance (BA) 2 FAPb 2 I 7 arrays are synthesized on a polyethylene terephthalate (PET) flexible substrate , on a large scale, high quality, and controllable manner by introducing Au nanoparticles to enhance film quality upon the annealing process and recrystallization by applying formamidinium chloride (FACl) post-treatment to reduce perovskite film defects, combined with an innovative SiO 2 -assisted hydrophilic and hydrophobic surface treatment strategy. The prepared flexible PDs arrays show excellent optoelectronic properties with high responsivity (5.9 A W −1 ), a detectivity of 8.2 × 10 12 Jones, large on/off current ratio (up to 3 × 10 4 ), ultimate response speed (12.8 μs/10.1 μs), and wide spectral response range. In addition, the device shows outstanding mechanical stability under severe bending (θ = 120°) and excellent folding durability after thousands of bending cycles. It also exhibits excellent environmental stability with only a slight degradation of photoresponse after 100 days of storage under the ambient environment. Finally, the integrated flexible PDs arrays can be used as an effective visible light image sensor with good spatial resolution, paving a multifunctional and competitive way for future wearable sensors and artificial vision systems. One-sentence summary Low-dimensional halide perovskite layers pixelized on a polyethylene terephthalate (PET) flexible substrate provide high performance photodetectors.
研究领域:
材料科学
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光电子学
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纳米技术
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成像技术
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可穿戴设备
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）