PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·
IF 2.9
Zhiqun Xu,Dengfeng Luo,Pei Wu,Bo Hou,Zhihao Zhang,Shuqiang Wang,Teng Gao,Guobin Huang,Lan Fang
The commercial applications of lead halide perovskites are hindered by their negative environmental impact and inherent instability. Consequently, developing environmentally friendly copper-based perovskite materials is crucial for future solid-state lighting and display applications. In this study, an ultrafast high-power ultrasonic synthesis strategy was utilized to achieve uniform nucleation and growth of Cs3Cu2X5 (X = Cl, Br, I) nanocrystals (NCs) that possess remarkable luminescence properties, hydroxyl protection, and ligand-free characteristics. These Cs3Cu2X5 NCs exhibited a tunable spectral range spanning from 446 to 525 nm, accompanied by photoluminescence quantum yields (PLQYs) varying from 0.2% to 79.2%. The spectral attributes of the NCs were effectively controlled by modulating the halide type and composition. It is worth noting that density functional theory (DFT) calculations offer valuable insights into the synthesis of NCs and the selection of suitable alcohol solvents. Moreover, we successfully fabricated an efficient and stable white light-emitting diode (WLED) with a high luminous efficiency of 23 lm W−1 and CIE color coordinates of (0.3266, 0.3487). Our work provides a new strategy to synthesize Cs3Cu2X5 NCs and holds promise for their potential application in display and lighting devices.
研究领域:
材料科学
·
光学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Saudi Chemical Society
·
2016
·
IF 1.978
Xiaomeng Xia,Xi Gao,Junhui Xu,Chuanfeng Hu,Xinhua Peng
A feasible palladium-catalyzed Wacker oxidation system has been developed, which is characterized by not adding ligand and using hydrogen peroxide as the sole oxidant. Compared with the traditional Wacker system, the described method offers a facile and environment-friendly choice using the green oxidant, and can be applied to more complex substrates.
研究领域:
有机化学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yan-Fei Mu,Chao Zhang,Meng-Ran Zhang,Wen Zhang,Min Zhang,Tong-Bu Lu
Up to now, the majority of the developed photocatalytic CO2 reduction systems need to use expensive sacrificial reductants as electron source. It is still a huge challenge to drive the photocatalytic CO2 reduction using water as an electron source. Herein, we report a facile strategy for the construction of direct Z-scheme heterojunction of LF-FAPbBr3/α-Fe2O3, which is manufactured by the in situ and two-step controlled growth of ligand-free formamidinium lead bromide (LF-FAPbBr3) nanocrystals on the surface of α-Fe2O3 nanorods. The matchable energy levels and direct contact between LF-FAPbBr3 and α-Fe2O3 significantly accelerate the interfacial charge transfer, with a charge separation efficiency (ηseparation) of 93%, much higher than that of 11% shown by the ligand-capped FAPbBr3/α-Fe2O3 heterojunction. The resulting efficient separation and raised redox ability of photogenerated carriers endow the LF-FAPbBr3/α-Fe2O3 heterojunction with an outstanding photocatalytic performance for CO2 reduction (to CO and CH4) coupled with water oxidation (to O2), achieving a highest electron consumption rate of 175.0 μmol g–1 h–1 among the reported metal halide perovskite-based photocatalysts, which are 5 and 11 times higher in comparison with those of sole LF-FAPbBr3 and ligand-capped FAPbBr3/α-Fe2O3, respectively.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Linfang Lu,Yuelin Gu,Weiyi Guo,Fengyan Lu,Yunxia Li
The synthesis of ultrasmall-sized nanoparticles (NPs) has attracted serious attention in the past several years because of the largely increased surface-to-volume ratio of these NPs. Ligands are necessarily used to synthesize these NPs. However, the traditional ligands employed in the colloidal synthesis process would be strongly adsorbed on the surface of the metal NPs, leading to incomplete exposure of catalytically active sites. Here, we develop an efficient solid-state method to synthesize carbon-supported extrasmall ligand-free Pt nanoparticles (Pt SNPs/C) or Pd SNPs/C on a large scale (up to gram equivalent). The strong interfacial interaction between the modified carbon support and inorganometallic precursor is believed to successfully prepare this Pt SNPs/C catalyst. In particular, the fabricated Pt SNPs/C catalyst is ligand-free, which is carefully verified by different techniques (thermogravimetric analysis, X-ray photoelectron spectroscopy, and “electrochemical surface area (ECSA)” measurement). Because of the higher ECSA, Pt SNPs/C exhibits better catalytic activities toward methanol oxidation and hydrogen evolution than commercial Pt/C. By applying the catalyst as both the anode and cathode in a methanol-assisted water splitting system, the cell displays much better efficiency to produce highly valued hydrogen compared to that of commercial Pt/C components.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 11
·4170-4180
·
IF 8.307
Zhenheng Zhang,Shengyi Yang,Jinming Hu,Hui Peng,Hailong Li,Peiyun Tang,Yurong Jiang,Libin Tang,Bingsuo Zou
Recently, lead-based halide perovskites have gained extensive attention due to their outstanding optoelectronic properties. However, the toxicity of lead would seriously limit its future application. To address these issues, in this work novel ligand-free organic–inorganic hybrid metal halide TBASnCl3 (C16H36NSnCl3) quantum dots are synthesized by a one-pot method at room temperature, and they showed high anti-water stability and high potential applications for high-performance UVC photodetectors. Our experimental data showed that the responsivity of the lateral photodetectors Au/TBASnCl3/Au, in which the active layer (i.e. TBASnCl3) was synthesized by further introducing SnF2 as a precursor besides SnCl2, reached 7.3 mA W−1 with a specific detectivity of 1.67 × 1011 Jones under 0.36 mW cm−2 254 nm illumination at −5 V, and it showed a long lifetime even in an environment with an air humidity of 60%. Therefore, it laid a solid foundation for further fabricating lead-free metal halide optoelectronic devices.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xinxing Zhou,Kerui Li,Chengyi Hou,Qinghong Zhang,Yaogang Li,Hongzhi Wang
Exploring non-BiSbTe thermoelectric (TE) materials operable in the near room temperature range has emerged as a vibrant research frontier. However, the current synthesis of such materials heavily relies on energy-intensive techniques, with harsh conditions and the use of toxic reagents. In this work, a scalable, safe, simple, and cost-effective solution-based method is reported for synthesizing β -CuAgSe materials with a topologically dendritic structure. Notably, the synthesized material's surface is free from the complex organic ligands typically left by conventional synthesis methods, which mitigates the electrical performance degradation due to the intricate structure. Meanwhile, the multi-scale phonon scattering induced by the complex structure leads to a reduction in thermal conductivity. As a result, the material achieves a maximum ZT max of 0.48 at 298K and ZT ave of 0.42 in the 298–348K range, surpassing other doped CuAgSe materials and ranking among the top in various materials synthesized via solvothermal methods. The successful fabrication of thermoelectric devices (TED) enhanced with integrated radiative cooling and TE pastes formulated from these materials demonstrates their potential for applications in flexible TE.
研究领域:
材料科学
·
能源材料
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2018
·Vol. 9
·期 34
·4386-4394
·
IF 4.927
Jirong Wang,Mengying Tian,Shaoqiao Li,Rui Wang,Feipeng Du,Zhigang Xue
Iron-based simplified electrochemically mediated atom transfer radical polymerization (seATRP) was successfully developed by using a sacrificial counter electrode and discarding organic nitrogen or phosphorus ligands. The catalytic activity of FeCl3·6H2O could be modulated just by different kinds of polar solvents (NMP, DMI, DMF, MeCN, and PEG200). With all of these solvents, polymerization of methyl methacrylate was effective and well-controlled with the agreement of theoretical molecular weight with experimental values, linear first-order kinetics, and narrow molecular weight distributions. This system is particularly intriguing because (i) expensive and toxic ligands are not required, (ii) the whole polymerization process could be operated in air, (iii) the activity is high even when catalyst loading is reduced down to 70 ppm and with low solvent content, and (iv) the reaction can be conducted in biocompatible and less expensive PEG200. Also, the effects of the magnitude of the applied potential, the species of catalysts, the monomer/solvent ratio and the initiators were also studied in detail.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
COLORATION TECHNOLOGY
·
2017
·Vol. 133
·期 4
·283-292
·
IF 1.107
Yan-Qin Zhang,Li Qi,Jian-Ping Sun,Jia-Jie Long
A new anthraquinonoid disperse reactive dye containing a dichlorotriazine reactive group was successfully synthesised on the basis of the Ullmann reaction in a ligand-free system by employing a copper( i ) iodide as catalyst, in combination with a subsequent condensation reaction. The parameters of the cross-coupling reaction between 1-chloroanthraquinone and 2,5-diaminotoluene sulphate were investigated and optimised, such as the molar ratio of the reactants, the dosage of potassium carbonate and copper( i ) iodide, the reaction temperature, and the reaction time. The results demonstrate that the dosage of potassium carbonate and the reaction time had significant impacts on the yield of the dye precursor, and an optimum synthesis process was also recommended. Moreover, the achieved dye was successfully characterised and confirmed from chemical structure and colour characteristics by employing Fourier transform infrared analysis, nuclear magnetic resonance spectroscopy, UV-vis absorption spectroscopy, elemental analysis, and liquid chromatography–mass spectrometry (LC-MS). Furthermore, a successful application of the obtained dye was achieved, with satisfactory coloration properties on silk and wool.
研究领域:
有机化学
·
染料化学
·
材料科学
✓ 已验证
DOI
高影响因子
ChemNanoMat
·
2019
·Vol. 6
·期 2
·258-266
·
IF 3.431
Yunwei Wei,Ruijia Sun,Yuehua Li,Yuhai Zhang,Yizhong Lu,Xiaoming Li,Guozhu Chen,Bingqiang Cao,Cuncheng Li,Haibo Zeng
The preparation of luminescent Cs 4 PbBr 6 perovskite solids with current methods either needs a complex procedure, or needs a variety of ligands, and a combination of good solvents and anti-solvents. The potential environmental risks are inevitable when they are produced in large scale. Herein, an environmentally friendly route for the mass production of luminescent Cs 4 PbBr 6 perovskite solids using a single solvent under ambient conditions is presented. Gram-scale Cs 4 PbBr 6 perovskite solids are produced within tens of minutes using a small amount of DMF, specifically, 4 mL DMF solution can produce over 10 g products per batch. Because no ligands and anti-solvents are utilized in the whole procedures, the ligand-free Cs 4 PbBr 6 perovskite solids are facilely harvested after the evaporation of solvent. More importantly, the solvent vapor can be recovered and reutilized, which can eliminate the environmental pollution caused by organic solvent. The experimental results revealed that the solvent, reaction time, and PbBr 2 /CsBr molar ratios are crucial for the formation of Cs 4 PbBr 6 perovskite solids and their luminescent performances. Such Cs 4 PbBr 6 perovskite solids exhibit strong green PL emission, high PL quantum yield and reversible fluorescent response towards heat and light, which enable them to be suitable for applications in optoelectronic devices.
研究领域:
材料科学
·
化学
·
纳米技术
·
环境科学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Chen Zhang,Lan Jiang,Zhiyi Sun,Zheng Tang,Kaiyuan Lu,Qimiao Zhu,Xianze Zhang,Haozhe Ge,Zipeng Zhao,Wenxing Chen,Xueqiang Zhang
Methanol oxidation reaction (MOR) is critical for direct methanol fuel cells (DMFCs), but designing cost-effective Pt-based catalysts with high catalytic activity remains challenging. The study synthesizes lanthanide-doped Pt nanoclusters via femtosecond laser ablation, with PtLa clusters achieving a mass activity of up to 17.50 A mg Pt −1 . Characterization shows these metastable PtLa nanoclusters feature clean surfaces and uniform La distribution within Pt nanocrystal frameworks. Comprehensive in situ/operando techniques, including attenuated total reflectance-surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS), ambient pressure X-ray photoelectron spectroscopy (APXPS), and X-ray absorption spectroscopy (XAS), demonstrate that La incorporation markedly enhances both OH − adsorption and the central role of HCOO − as the primary reaction intermediate during MOR. Ultraviolet photoelectron spectroscopy (UPS) and density functional theory (DFT) calculations indicate La doping elevates the Pt d-band center, strengthening intermediate adsorption and reducing kinetic barriers. The oxygenophilic nature of La enhances local OH − coverage near active sites, facilitating the activation of reaction intermediates and accelerating the turnover rate at electrolyte/electrode interface. The study provides a facile and effective strategy for synthesizing conventionally difficult-to-synthesize catalysts using femtosecond laser technology, paving the way for the controlled preparation of rare earth alloys and applications in large-scale deployment of DMFCs and beyond.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源材料
·
表面科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhen-Dong Lian,Bo Wang,Zhi-Sheng Wu,Hao Lin,Shan-Shan Yan,Jie-Lei Li,Kang Zhang,Qing-Guang Zeng,Jin-Cheng Xu,Shi Chen,Shuang-Peng Wang,Kar Wei Ng
CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) have shown great potential in numerous applications including wide color gamut display and lighting. Despite the wonderful luminescence properties, the inherent instability of these NCs hinders their use in practical situations. Herein, we report a facile aqueous-based, ligand-free method to synthesize highly stable CsPbX3 NCs using ZIF-62, a metal–organic framework, as an encapsulation matrix which effectively isolates CsPbX3 from the surrounding. We discovered that the slightly alkaline nature of ZIF-62 facilitates the reaction between water and PbBr2 to form PbBr(OH), which not only passivates the surface defects of the CsPbBr3 NCs but also prevents the perovskite from decomposing or oxidizing at high temperature. Sintering of ZIF-62 can therefore be performed in air at ∼300 °C to completely seal the perovskite within the insulating matrix, resulting in CsPbBr3/ZIF-62 composites exhibiting high stability against polar solvents, heat, light, and ambient humidity. Notably, the composite can maintain its bright luminescence without noticeable degradation in water for more than 2 months. The narrow-band emission and stability of these composites led to the demonstration of white light-emitting diodes with excellent color stability. Without the need for organic solvents during NC synthesis and noble gas ambient during sintering, the strategy proposed here can potentially facilitate the cost-effective, large-scale synthesis of highly stable perovskites which show great promise in commercial applications.
研究领域:
材料科学
·
纳米技术
·
光电技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2012
·
IF 5.167
Yang Wang,Wei Zhao,Xinli Liu,Dongmei Cui,Eugene Y.-X. Chen
A simple, inexpensive, and convenient catalyst system consisting of supporting ligand-free MgnBu2 in combination with an alcohol, isopropanol (iPrOH), benzyl methanol (PhCH2OH), diphenylmethanol (Ph2CHOH), or triphenylmethanol (Ph3COH), generates a convenient catalyst system to promote the polymerization of l-LA. In particular, the binary system MgnBu2/Ph2CHOH demonstrates an unprecedentedly high activity in the presence of a large excess amount of Ph2CHOH with the [OH]0/[Mg]0 ratio varying from 2 to 500, producing up to 500 polylactide (PLA) chains per Mg center and thus showing a typical nature of immortal polymerization. The molecular weights of the obtained PLAs with a broad range of monomer-to-metal ratios ([l-LA]0/[Mg]0 = 200–5000) are rather accurately controlled by the Ph2CHOH loading, relative to [Mg]0, while the molecular weight distributions remain nearly constant with polydispersity index (PDI) = 1.08–1.18. Moreover, the active polymerization intermediate has been isolated from the stoichiometric reaction between MgnBu2 and Ph2CHOH and structurally characterized as a tetranuclear complex, Mg4(Ph2CHO)8(THF)2 (1). Complex 1 remains the tetranuclear structure in solution or in the presence of excess Ph2CHOH as determined by 2D DOSY. On the basis of structural information about the active intermediates and polymerization kinetics, a coordination–insertion polymerization mechanism is proposed.
研究领域:
化学
·
高分子科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）