Advanced Optical Materials
·
2022
·Vol. 10
·期 15
·2200605
·
IF 10.05
Shaofan Fang,Bo Zhou,Huixia Li,Hanlin Hu,Haizhe Zhong,Henan Li,Yumeng Shi
Metal halide perovskites are promising optoelectronic materials due to their unique luminescent properties. However, their practical application is limited by their poor chemical stability, especially in humid environments. Moisture can cause phase changes or chemical decomposition, resulting in significant fluorescence quenching. In this study, a copper-based organic–inorganic hybrid metal halide (t-BA) 3 Cu 6 I 9 is synthesized (t-BA + is the tert-butyl-ammonium ion (C(CH 3 ) 3 NH 3 + )). This material exhibits water-induced luminescence, and its chemical stability in humid environments is being investigated. Tetragonal t-BA 3 Cu 6 I 9 is not luminescent, but it reacts quickly with water in the air. The resultant (t-BA) 2 Cu 2 I 4 ·H 2 O has a broad green emission peak at 520 nm, high photoluminescence quantum yield of 59.4%. Remarkably, (t-BA) 2 Cu 2 I 4 ·H 2 O is converted back to t-BA 3 Cu 6 I 9 at temperatures above 40 °C. This phase conversion is highly repeatable, and the luminescent intensity can be fully recovered after 50 transformation cycles. The mechanism of luminescence is investigated through temperature-dependent photoluminescence spectra and theoretical calculation, which suggests that (t-BA) 2 Cu 2 I 4 ·H 2 O has a more localized charge distribution and sufficient polyhedral distortion, resulting in a bright and efficient emission from self-trapped excitons. This is the first report of water-induced luminescence in copper-based metal halides, and it paves the way for stable luminescent materials that are responsive to humidity.
研究领域:
材料化学
·
光物理学
·
无机化学
·
功能材料
·
发光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Xiao Yang,Minjian Ma,Chunming Xu,Rongzheng Ren,Jinshuo Qiao,Wang Sun,Kening Sun,Zhenhua Wang
Hybrid direct carbon fuel cells (HDCFCs) present its inherent and unparalleled advantages in converting chemical energy from organic waste, biomass, and coal directly into clean energy with high efficiency. However, the progress of HDCFC technology continues to be hampered by the sluggish anode reaction kinetics. Herein, an effective design strategy for HDCFC anode is proposed, a Cu-modified Sr 2 Fe 1.3 Cu 0.2 Mo 0.5 O 6-δ (SFCM) perovskite oxide is developed to meet the requirements of intermediate-temperature HDCFC anode. The Cu-doping SFCM anode demonstrates excellent redox structural stability and catalytic activity. In addition, the electrolyte-supported single cell with Cu-doping SFCM anode has improved the peak power density from 285.5 mW cm −2 to 489.3 mW cm −2 at 800 °C with activated carbon as the fuel. The significantly enhanced anode catalytic activity is primarily due to the improved interfacial activity and chemical adsorption of CO. Therefore, the present work shows an effective strategy for designing and developing novel high-performance HDCFCs anode materials .
研究领域:
能源材料
·
电化学
·
燃料电池
·
功能材料
·
催化化学
✓ 已验证
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2018
·Vol. 35
·期 4
·1700471
·
IF 4.384
Shanliang Song,Chuanxi Wang,Yue Zhao,Tantan Hu,Xinxin Zhou,Tianxin Zhao,Minghui Yang,Quan Lin
A dual-emission ratiometric fluorescent sensing film for metal ion detection is designed. This dual-emission film is successfully prepared from chitosan, graphitic carbon nitride (g-C 3 N 4 ), and gold nanoclusters (Au NCs). Here, it is shown that the g-C 3 N 4 not only serves as the fluorescence emission source, but also enhances the mechanical and thermal stability of the film. Meanwhile, the Au NCs are adsorbed on the surface of chitosan film by the electrostatic interaction. The as-prepared dual-emission film can selectively detect Cu 2+ , leading to the quench of red fluorescence of Au NCs, whereas the blue fluorescence from g-C 3 N 4 persists. The ratio of the two fluorescence intensities depends on the Cu 2+ concentration and the fluorescence color changes from orange red to yellow, cyan, and finally to blue with increasing Cu 2+ concentration. Thus, the as-prepared dual-emission film can be worked as ratiometric sensing paper for Cu 2+ detection. Furthermore, the film shows high sensitivity and selectivity, with low limit of detection (LOD) (10 ppb). It is observed that this novel gold-cluster-based dual-emission ratiometric fluorescent sensing paper is an easy and convenient way for detecting metal ions. It is believed that this research work have created another avenue for the detection of metal ions in the environment.
研究领域:
分析化学
·
环境科学
·
材料科学
·
纳米技术
·
生物传感器
·
环境监测
·
分子探针
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Parvaiz Ahmad Naik,N. Indumathi,B. Ganga,S. Charles,A. K. Abdul Hakeem,Zahoor Iqbal,ElSayed Tag-ElDin,Jian Zu
The topic of two-dimensional steady laminar MHD boundary layer flow across a wedge with non-Newtonian hybrid nanoliquid (CuO-TiO2/C2H6O2) with viscous dissipation and radiation is taken into consideration. The controlling partial differential equations have been converted to non-linear higher-order ordinary differential equations using the appropriate similarity transformations. It is demonstrated that a number of thermo-physical characteristics govern the transmuted model. The issue is then mathematically resolved. When the method’s accuracy is compared to results that have already been published, an excellent agreement is found. While the thermal distribution increases with an increase in Eckert number, radiation and porosity parameters, the velocity distribution decreases as porosity increases.
研究领域:
流体力学
·
传热传质
·
纳米流体
·
磁流体动力学
·
多孔介质
·
非牛顿流体
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2012
·
IF 2.289
Jiasong Zhong,Weidong Xiang,Haijun Zhao,Wenguang Zhao,Guoxin Chen,Xiaojuan Liang
Copper quantum dots embedded in sodium borosilicate glass matrix were fabricated and analyzed in terms of their structural, chemical, and optical properties. X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses revealed that copper quantum dots were in face-centered-cubic crystalline phase and in the metallic state. Size and distribution of the quantum dots were measured by transmission electron microscopy (TEM) as well as high-resolution transmission electron microscopy (HRTEM). The results showed spherical shape have formed uniformly in the glass, and the size of these quantum dots were range from 1.5 to 5 nm with the average particle size about 2.7 nm. The third-order nonlinear optical properties of copper quantum dots doped glass were investigated by using Z-scan technique at the wavelength of 800 nm with femtosecond Ti: sapphire laser radiation. The value of third-order optical nonlinear susceptibility χ (3) of the glass was estimated to be 2.41 × 10 −11 esu.
研究领域:
材料科学
·
纳米科技
·
光学材料
·
凝聚态物理
·
无机非金属材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Fa Cao,Ling Jin,Yong Wu,Xiaohong Ji
Self-powered Ultraviolet (UV) photodetectors (PDs) have attracted great attention due to their outstanding performance. Herein, we report the successful fabrication of self-powered UV PDs based on ZnO/CuI/Au heterojunction . An ultra-high on/off ratio of 4250 and fast rise/decay times of 0.41/0.08 s have been demonstrated from the ZnO/CuI/Au PD. Moreover, the PD exhibits a high responsivity of 61.5 mA/W and detectivity of 1.7 × 10 10 Jones. The device displays long-term cyclic stability with 98.9% retention after 1000 cycles continuous test and superior environmental stability with 97.1% retention tested after 6 months. The synergistic effects of plasmonic Au nanoparticles and ZnO/CuI pn heterostructure play important roles in the enhancement of the photodetect ability. The concept of employing plasmonic Au nanoparticles onto the heterostructure indicates huge potential in achieving self-powered UV PDs for practical applications.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
半导体物理
·
器件工程
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 68
·15586-15593
·
IF 5.16
Rengui Li,Yixuan Yang,Na Sun,Long Kuai
Development of Pt group metal-free catalysts for low-temperature CO oxidation remains critical. In this work, active and stable mesoporous Cu-Ce-O x solid solutions are prepared by using spray pyrolysis. The specific surface areas and pore volumes reach as high as 170 m 2 g −1 and 0.24 cm 3 g −1 , respectively. The results of CO oxidation study suggest that (1) the catalyst obtained by spray pyrolysis possesses much higher activity than those made by co-precipitation, sol-gel, and hydrothermal methods; (2) the optimal Cu 0.2 -Ce 0.8 -O x solid solution presents a reactivity over 28 times that of both single-component CuO and CeO 2 at 70 °C. Based on the study of pure-phase Cu-Ce-O x solid solutions by selective leaching of segregated CuO x species, the active center for CO oxidation is confirmed as the bimetallic Cu-Ce-O site, whereas the individual CuO x particles not only act as spectators but also block the active Cu-Ce-O sites. A low apparent activation energy of approximately 48 kJ mol −1 is detected for CO oxidation at the Cu-Ce-O site, making Cu-Ce-O x solid solutions able to present high activity at low temperature. Furthermore, the Cu-Ce-O x catalysts exhibit excellent stability and thermal tolerance toward CO oxidation. Graphical Pt-free CO oxidation : Well-shaped mesoporous Cu-Ce-O x solid solutions were produced for low-temperature CO oxidation by using a nitrate spray pyrolysis route, and a selective leaching strategy was adopted to remove the surface segregated CuO x species. The bimetallic Cu-Ce-O site was confirmed as the active center for CO oxidation, whereas the individually segregated CuO x species not only acted as spectators, but also blocked the active Cu-Ce-O sites (see scheme).
研究领域:
催化化学
·
材料科学
·
环境化学
·
能源化学
·
纳米材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 46
·26513-26523
·
IF 10.733
Peng Huang,Min Huang,Hai Hu,Yuan Zhong,Chao Lai,Shulei Chou
The push for high performing electronic devices with long battery lives has rapidly advanced the field of energy storage systems. Niobium oxides have stood out as promising candidates to improve the storage and rate performance of anodes in lithium- and especially sodium-ion batteries due to their larger interplanar lattice spacing and patulous framework. Herein, we report the first synthesis of a nanosized metal/metal oxide hybrid composite coated by N-doped carbon and anchored onto reduced graphene oxide (NbO/Cu@NC-RGO) through in situ carbonizing of Cu-doped polyoxoniobate precursors. The strong synergistic effects between the uniformly distributed NbO/Cu hybrid nanoparticles, the N-doped carbon coating layer, and graphene substrates not only ensure efficient electron and ion transport, but also boost pseudocapacitive charge storage. The resulting composite exhibits a maximum reversible charge capacity of 580 mA h g−1 after 100 cycles at a current density of 100 mA g−1 when utilized in lithium-ion batteries (LIBs), and 203 mA h g−1 when utilized in sodium-ion batteries (SIBs). For SIBs in particular, a long-lifetime of 1012 cycles is observed when cycled at a high current density of 800 mA g−1. This work represents a promising step forward in the design and preparation of metal oxide composite anodes for LIBs and SIBs.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
无机化学
·
先进电池材料
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiaoxue Li,Keyu Xie,Long Song,Mengjia Zhao,Zhipan Zhang
The effective separation of photogenerated electrons and holes in photocatalysts is a prerequisite for efficient photocatalytic water splitting. CuInS2 (CIS) is a widely used light absorber that works properly in photovoltaics but only shows limited performance in solar-driven hydrogen evolution due to its intrinsically severe charge recombination. Here, we prepare hierarchical graphitic C3N4-supported CuInS2 (denoted as GsC) by an in situ growth of CIS directly on exfoliated thin graphitic C3N4 nanosheets (g-C3N4 NS) and demonstrate efficient separation of photoinduced charge carriers in the GsC by forming the Z-scheme system for the first time in CIS-catalyzed water splitting. Under visible light illumination, the GsC features an enhanced hydrogen evolution rate up to 1290 μmol g–1 h–1, which is 3.3 and 6.1 times higher than that of g-C3N4 NS and bare-CIS, respectively, thus setting a new performance benchmark for CIS-based water-splitting photocatalysts.
研究领域:
材料化学
·
光催化
·
能源化学
·
纳米材料
·
可持续能源
·
半导体物理
·
表面科学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2015
·Vol. 6
·期 15
·2837-2843
·
IF 5.52
Yipeng Wei,Pingwei Liu,Wen-Jun Wang,Bo-Geng Li,Shiping Zhu
In emulsion atom transfer radical polymerization (ATRP), escape of catalytic copper ion species from the particle to the aqueous phase represents one of the major challenges which causes uncontrollable polymerization and/or unstable latex. We addressed this issue by employing a functional surfactant–ligand (SL) design as the capture agent (CA), which prevented the copper species from escape in the emulsion ATRP. In this work, emulsion ATRP of methyl methacrylate (MMA) mediated CuCl2/4,4-di(5-nonyl)-2,2′-bipyridine (dNbpy) was carried out with Brij-98 as a surfactant in the presence of a small amount of CA. The CA molecules effectively captured dissociated copper ions inside the particle, thus efficiently decreasing the copper ion concentration in the aqueous phase. Only 3 wt% of surfactant loading (0.6 wt% CA and 2.4 wt% Brij-98 based on MMA) was needed to achieve well-controlled ATRP and to stabilize the emulsion system, which is a significant reduction from a typical 13–18 wt% often used in the studies reported in the literature.
研究领域:
高分子化学
·
材料科学
·
纳米技术
·
胶体与界面科学
·
可控聚合
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 46
·45484
·
IF 1.86
Teng Xue,Erjun Tang,Jian Zhou,Ruitao Han,Shaojie Liu
A coordinating ionic liquid (IL), 1-[(diethyl amine)amine]ethyl-3-methyl imidazolium chloride ([N 3 MIM]Cl), was prepared as an alternative to a simple organic ligand to coordinate to copper(I) bromide (CuBr). We, thereby, obtained a novel catalyst for atom transfer radical polymerization (ATRP) reactions. This catalyst was applied to the ATRP of methyl methacrylate in the IL 1-allyl-3-methyl imidazolium chloride ([AMIM]Cl). The chemical structures of the ILs obtained were confirmed by Fourier transform infrared spectroscopy, mass spectrometry, and 1 H-NMR analyses. The coordination ability of [N 3 MIM]Cl was assessed by cyclic voltammetry, and the redox potential of [N 3 MIM]Cl–CuBr was −0.507 V. The [N 3 MIM]Cl–CuBr complex was expected to be a markedly more active catalyst than the amine DETA–CuBr complex. The coordination mode toward CuBr was also examined. The [N 3 MIM]Cl–CuBr catalyst system showed good controllability in the aforementioned ATRP reaction in [AMIM]Cl. The Cu catalyst was easily separated from the obtained polymer with the coordinating IL as a ligand. Consequently, the coordinating IL overcame the shortcomings of traditional organic ligands, such as poor compatibility with IL media and poor separation of the catalyst from the polymer; this makes it highly promising for applications in the ATRP field. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45484.
研究领域:
高分子化学
·
催化化学
·
功能材料
·
绿色溶剂
·
配位化学
·
电化学
✓ 已验证
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 48
·1901527
·
IF 10.856
Zhaofeng Zhai,Bing Leng,Nianjun Yang,Bing Yang,Lusheng Liu,Nan Huang,Xin Jiang
Tremendous demands for highly sensitive and selective nonenzymatic electrochemical biosensors have motivated intensive research on advanced electrode materials with high electrocatalytic activity. Herein, the 3D-networked CuO@carbon nanowalls/diamond (C/D) architecture is rationally designed, and it demonstrates wide linear range (0.5 × 10 −6 –4 × 10 −3 m ), high sensitivity (1650 µA cm −2 m m −1 ), and low detection limit (0.5 × 10 −6 m ), together with high selectivity, great long-term stability, and good reproducibility in glucose determination. The outstanding performance of the CuO@C/D electrode can be ascribed to the synergistic effect coming from high-electrocatalytic-activity CuO nanoparticles and 3D-networked conductive C/D film. The C/D film is composed of carbon nanowalls and diamond nanoplatelets; and owing to the large surface area, accessible open surfaces, and high electrical conduction, it works as an excellent transducer, greatly accelerating the mass- and charge-transport kinetics of electrocatalytic reaction on the CuO biorecognition element. Besides, the vertical aligned diamond nanoplatelet scaffolds could improve structural and mechanical stability of the designed electrode in long-term performance. The excellent CuO@C/D electrode promises potential application in practical glucose detection, and the strategy proposed here can also be extended to construct other biorecognition elements on the 3D-networked conductive C/D transducer for various high-performance nonenzymatic electrochemical biosensors.
研究领域:
生物医学工程
·
纳米医学
·
电化学传感
·
生物传感器
·
材料科学
·
分子诊断
·
转化医学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）