Environmental Science-Nano
·
2023
·Vol. 11
·期 1
·309-323
·
IF 7.3
Xin Liu,Xiang He,Zhi-Cheng Ma,Xi Xi,Shuang-Xi Wang
Organic ammonium salts which are formed from heterogeneous reactions are one of the important components of nitrogen-containing organic compounds (NOCs) in the atmosphere. In order to investigate the formation process of organic ammonium salts, a gas-flow system with the diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) technique was applied to monitor the influence of a simulated illumination on the heterogeneous reactions of toluene/O3/NH3 on hematite nanoparticles. The results revealed that toluene was transformed into benzoic acid under the action of oxidants (O3 and OH radicals). The carboxylic acid was neutralized with NH3 to form ammonium benzoate. The effect of light intensities on the reaction kinetics of ammonium benzoate formation from the heterogeneous reactions was also analyzed. With an increase in the light intensity from dark to 36 mW cm−2, the reaction rates increased from (1.20 ± 0.02) × 1018 ions per g s−1 to (2.30 ± 0.09) × 1018 ions per g s−1. This induced the formation of abundant active radicals, which accelerated the conversion of toluene to ammonium benzoate on hematite nanoparticles. However, the reaction rates decreased to (1.80 ± 0.03) × 1018 ions per g s−1 as the light intensity continued to increase to 100 mW cm−2. The yield of organic ammonium salts might be reduced owing to the volatilization of ammonium benzoate at a high light intensity. Meanwhile, the initial uptake coefficient showed a similar change trend. The values of the uptake coefficient increased by 81.1% when the light intensity increased from 0 mW cm−2 to 36 mW cm−2 but decreased by 21.1% when the light intensity increased from 36 mW cm−2 to 100 mW cm−2. Our results not only propose the heterogeneous reaction kinetics of toluene/O3/NH3 on the nanoscale hematite surface under different light intensity conditions, but also provide a theoretical support for further understanding the conversion process of volatile organic compounds (VOCs) under combined atmospheric pollution.
研究领域:
大气化学
·
环境科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 4
·771
·
IF 3.267
Hao Xu,YuXia Yu,LongFeng Zhu,ChaoQun Bian,HangLing Zhai,JianYing Tong,HuiZhen Wu,Chao Shen
Preparation of aluminosilicate ferrierite (FER) zeolite nanosheets with controllable thickness in the presence of a sole organic ammonium is attractive, but still challenging. In this report, with the employment ofN,N-diethyl-cis-2,6-dimethylpiperidinium (DMP) as both a structure directing agent and crystal growth inhibitor, aluminosilicate FER zeolite nanosheets, with a variety of crystal thicknesses, ranging from 6 to 200 nm, are successfully synthesized under hydrothermal conditions. Very interestingly, the amount of DMP in the starting gel is the key factor for crystal thickness control of aluminosilicate FER zeolite nanosheets. The obtained FER products, with different thicknesses, are well characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), N2sorption, thermogravimetric analysis (TG), inductively coupled plasma (ICP), and magic angle spinning nuclear magnetic resonance (MAS NMR) techniques. This simple strategy might provide a novel avenue for the synthesis of other zeolite nanosheets with controllable thickness.Keywords:aluminosilicate FER zeolite;morphology control;nanosheet;organic ammonium
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2021
·
IF 4.354
Yuanyuan Tang,Kuan Liu,Jinjin Zhang,Long Liu,Tianzeng Huang,Chunya Li,Zhi Tang,Tieqiao Chen
A palladium-catalyzed difunctionalization of bicyclic alkenes with organoammonium salts and organoboronic compounds was reported. A wide range of functionalized cyclic products, including those bearing functional groups, were produced stereoselectively in good to excellent yields. The gram-scale experiment, one-pot operation, and synthetic application of β-borylated products further demonstrated the synthetic value of this new reaction in organic synthesis.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 18
·5957-5964
·
IF 4.174
Weiming Liu,Caiyun Liu,Wenli Wu,Guanyun Zhang,Jian Zhang,Chen-Ho Tung,Yifeng Wang
For the preparation of aqueous Ti-oxo clusters (TOCs) without organic ligands, organic ammonium cations (OACs) are important, but the mechanism is obscure. Here, the Ti4+/SO42− system was chosen as a model to investigate the roles of OACs. Three {Ti4} clusters were isolated from this system with different cationic additives. Structural analysis revealed a structural role of OACs: the hierarchically ordered array of the OACs in the organic layers was responsible for the stability and formation of crystalline precipitates. 17O NMR spectroscopy was used to study the interactions of OACs and SO42− with the Ti-oxo species in water under highly acidic conditions. SO42− enhanced the condensation of Ti4+ by binding to the TOC species. OACs could not enhance the condensation of Ti4+ but could change the solution speciation and especially promote the formation of {Ti18O27} clusters. We speculate that OACs interact with the cationic/neutral TOCs through anionic bridges to change the speciation. Under the synthetic conditions of {Ti4}, {Ti18O27} is the native TOC in solutions but {Ti4} is not.
研究领域:
无机化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2020
·Vol. 8
·期 8
·1902051
·
IF 8.286
Ying Han,Yawen Li,Yue Wang,Guangyue Cao,Sijia Yue,Lijun Zhang,Bin-Bin Cui,Qi Chen
Organic ammonium cations play a vital role in building structures and tuning energy bands of organic–inorganic halide perovskites and the consequent photoelectric characteristics. Here, two 2D lead bromide perovskites: flat-layered (BDA)PbBr 4 (BDA = 1, 4-butanediammonium), corrugation-layered (PDA) 7 Pb 6 Br 26 (PDA = 1, 3-propanediammonium) and a 1D nanobelt-shaped (EDA) 2 PbBr 6 (EDA = ethylenediammonium) are built to explore their tunable structure, energy bands, and photoluminescence by a series of linear alkyl diammonium cations. Significant “spatial effect” of diammonium cations directly controls the space configurations of these lead bromide perovskites. From 2D (100)-flat to 1D (110)-nanobelt, distortions and disconnections of lead bromide layers are beneficial to the quantum confinement and generation of self-trapping exciton (STE) energy levels of low-dimensional perovskites. Upon ultraviolet excitation, (BDA)PbBr 4 , (PDA) 7 Pb 6 Br 26 , and (EDA) 2 PbBr 6 exhibit blue, broadband yellowish white, and “warm” white emissions, respectively. Density functional theory combining STE theory demonstrates their bandgap changes and emission mechanisms. This work provides a basis for tuning the structure of low-dimensional organic–inorganic halide perovskites for better photochromic properties.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Wenzhen Lv,Yebo Cai,Yang Wang,Chengxi Sun,Xiangyu Chen,Siyu Liu,Chaofei Han,Ying Tang,Ligang Xu,Dongqing Lin,Runfeng Chen
Room-temperature phosphorescence (RTP) from organic ionic crystals mainly related to molecular packing has attracted growing attention over a wide range of advanced applications. However, limited research has focused on improving the RTP performance of organic materials in their aggregated state. Herein, we utilize the layer-by-layer self-assembly of organic ammonium chloride salts to enhance the macroscopic performance and increase the phosphorescence lifetime by 1–2 orders of magnitude. Especially, the millimeter-sized large organic ionic crystal exhibits an obvious RTP emission (insensitive to air) with an ultralong lifetime of 1886 ms, exceeding most counterparts. Molecular dynamics simulations reveal that the compact intermolecular stacking isolates oxygen molecules from the phenyl groups (distributing the spin population in the triplet state), which effectively suppresses triplet quenching for large crystals. Furthermore, other organic ammonium chloride salts also confirm such a macrocrystal-sized dependence on phosphorescence lifetimes. This work provides an effective crystallization strategy to realize an ultralong RTP emission, along with an extensive modulation of luminescence lifetime potential for time-gated encryption.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 7
·3940-3951
·
IF 12.732
Huan Bi,Xin Zuo,Baibai Liu,Dongmei He,Le Bai,Wenqi Wang,Xiong Li,Zeyun Xiao,Kuan Sun,Qunliang Song,Zhigang Zang,Jiangzhao Chen
Bulk and interfacial nonradiative recombination hinder the further enhancement of the power conversion efficiency (PCE) and stability of SnO2-based planar perovskite solar cells (PSCs). To date, it is still a huge challenge to minimize the bulk and interfacial nonradiative recombination losses, and thus maximize the potentials of PCE and stability. Herein, a novel and effective multifunctional modification strategy through incorporating Girard's Reagent T (GRT) molecules with multiple functional groups to modify SnO2 nanoparticles (NPs), which significantly reduces the bulk and interfacial nonradiative recombination losses through the simultaneous achievement of suppressing nanoparticle agglomeration, improving the electronic property of SnO2 films, facilitating the vertical growth and enlarging the grain size of perovskite crystals, and passivating interfacial defects is reported. As a result, the device based on GRT modification delivers a much higher PCE of 21.63%, along with significantly suppressed hysteresis, as compared to the control device (19.77%). The device stability is ameliorated after GRT modification. The unencapsulated device with GRT maintains 99.5% of its initial PCE after aging at 60 °C for 720 h and 58.5% after illumination for 672 h under one sun, respectively. The present work provides guidance for the design of multifunctional modification molecules toward efficient and stable PSCs.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Baoyu Han,Hongkun Cai,Chao Liu,Zhihao Hu,Jifeng Liu,Boyan Li,Shuping Lin,Qi Sun,Yingchen Li,Qinwen Guo,Jian Ni,Juan Li,Jianjun Zhang
Perovskite solar cells (PSCs) with wide bandgaps (WBG) have emerged as critical enablers as the top subcells in various series-connected configurations, enabling effective absorption of high-energy photons and yielding a high open-circuit voltage (VOC). However, these cells face significant challenges, including substantial photovoltage losses and phase separation, which hinder their potential efficiency and stability. We develop a molecular additive strategy employing the bifunctional ODABr diammonium salt (octadecane-1,8-diammonium bromide) during perovskite processing, and a hierarchically structured two-dimensional/three-dimensional (2D/3D) perovskite film with preferred crystallographic alignment and enhanced phase homogeneity is successfully engineered. The introduction of ODABr not only promotes preferential orientation growth of the perovskite film along the (100) crystal plane, enhancing charge carrier mobility, but also achieves higher phase stability (AM 1.5G). This dual functionality significantly reduces nonradiative recombination losses and prolongs carrier lifetime, thereby achieving a VOC of 1.22 V and a power conversion efficiency (PCE) of 20.71%. This research provides an important material strategy for realizing highly efficient and stable WBG perovskite solar cells.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2022
·
IF 4.331
You Liu,Song Gao,Chen Chen,Zichao Wu,Ping Gao,Xianglin Chen,Tianshi Qin
A low-dimensional organic amine lead halide perovskite is an attractive semiconductor material that has potential application prospects in photovoltaics, light-emitting diodes, detectors, X-ray imaging, and other fields. It has been reported that the photoelectric properties of low-dimensional perovskite can be controlled by adjusting the chain length of organic ammonium, the ratio of precursor components, and van der Waals interaction between amine molecules. Herein, we report the successful synthesis of low-dimensional perovskite (PdEA)PbI4 (PdEA = piperidine ethylammonium) and (MlEA)PbI4 (MlEA = morpholine ethylammonium) single crystals by regulating the intermolecular hydrogen bond of organic ammonium ligands. The two-dimensional (2D) layered structure (PdEA)PbI4 single crystal with a fluorescence reflection peak at 563 nm was produced by the reaction of PdEA with PbO in a concentrated hydroiodic acid aqueous solution. Differently, the (MlEA)PbI4 single crystal prepared by replacing MlEA with PdEA presents a one-dimensional (1D) rod structure, and its fluorescence reflection peak is located at 531 nm. The optical bandgaps of (PdEA)PbI4 and (MlEA)PbI4 perovskite films were about 2.16 and 2.33 eV, respectively. Low-dimensional perovskite solar cells with 2D (PdEA)PbI4 and 1D (MlEA)PbI4 of perovskite films yielded efficiencies of 1.18 and 1.52%, respectively.
研究领域:
材料科学
·
光伏技术
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 5
·1472-1478
·
IF 6.1
Chu Zhang,Chunying Ma,Shennan Chen,Tingli Ma
Resolving the inherent defects at the interfaces and grain boundaries of perovskite films is crucial for achieving highly efficient and stable perovskite solar cells (PSCs). This study introduces an antisolvent solubilization (AS) approach to enhance the solubilization of the bulk organic ammonium salt 2-Thiophenemethylammonium Iodide (ThMAI), which has limited solubility in low-polarity antisolvents. The results demonstrated that the AS approach could effectively passivate both shallow and deep defects in organic–inorganic hybrid perovskites (OIHPs). Furthermore, the ThMAI prepared using the AS method could react with excess PbI2 and facilitate the crystallization of the OIHPs, thereby improving light absorption, suppressing non-radiative recombination, and enhancing carrier extraction. As a result, PSCs prepared by using the AS method achieved a power conversion efficiency (PCE) of 23.69%, representing a 10% PCE improvement compared to normal devices. PSCs based on the AS method also demonstrated significantly improved heat and humidity stability.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Physics
·
2021
·
IF 9.298
Shibo Wang,Fengxian Cao,Yunjia Wu,Xiuchun Zhang,Jinjun Zou,Zhang Lan,Weihai Sun,Jihuai Wu,Peng Gao
Constructing three-dimensional (3D)/two-dimensional (2D) hybrid perovskite heterojunction has been proved to be a promising approach to improve the power conversion efficiency (PCE) and environmental stability of perovskite solar cells (PSCs). Here, an organic ammonium salt, cyclohexylmethylammonium bromide (CMABr), is deposited atop the primary 3D perovskite film to form ultrathin 2D perovskite with residual PbI 2 between the light-absorbing layer and the hole transport layer (HTL). The in-situ wide-band-gap 2D perovskite layer could play a multifunctional role in passivating the surface defects and protecting the underlying 3D perovskite film from humidity, resulting in the significantly suppressed non-radiative recombination process and superior moisture stability. As a result, a maximum PCE of 21.80% was obtained for the 3D/2D PSC as compared to that (19.62%) of pure 3D device. Moreover, the unencapsulated devices with 2D perovskite capping layer exhibited excellent long-term durability and mitigated hysteresis in contrast with the control device. Our study confirms that building 3D/2D perovskite heterojunctions by the utilization of organic ammonium salts is an effective way to develop highly efficient and stable PSCs.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 45
·21382-21388
·
IF 3.591
Zhen He,Fanning Meng,Lianjie Li,Liguo Gao,Tingli Ma
Due to the low cost and strong hydrophobicity of carbon electrodes, carbon-based perovskite solar cells (C-PSCs) have drawn much attention. Copper(I) thiocyanate (CuSCN) is a favorable hole transport layer in perovskite solar cells (PSCs) because of its high chemical stability, high conductivity, and high hole mobility, but pinholes often appear during CuSCN film fabrication. In this work, organic ammonium salt, phenethylammonium iodide (PEAI), has been applied to modify the CuSCN film. The results indicated that PEAI not only eliminated the pinholes, but also passivated the perovskite film and enhanced the interfacial connection. Therefore, the power conversion efficiency (PCE) of C-PSCs increased by about 11%. The stability test showed that the C-PSCs, without any encapsulation, could maintain 70% of the initial efficiency after storage for 800 h in ambient air with 60%–70% relative humidity at room temperature.
研究领域:
材料科学
·
能源技术
·
化学工程
✓ 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）