Nanomaterials
·
2022
·Vol. 12
·期 15
·2579
·
IF 5.719
Beiying Qi,Xinchang Wang,Xinyue Wang,Jipeng Cheng,Yuanyuan Shang
Metal–organic framework (MOF)-derived pure ZnO and Cu-doped ZnO nanocages were fabricated by calcining a zeolitic imidazole framework (ZIF-8) and Cu-doped ZIF-8. The morphology and crystal structure of the samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). It was found that Cu doping did not change the crystal structures and morphologies of MOF-derived ZnO nanocages. The H2S-sensing properties of the sensors based on ZnO and Cu-doped ZnO nanocages were investigated. The results indicated that the H2S-sensing properties of MOF-derived ZnO nanocages were effectively improved by Cu doping, and the optimal doping content was 3 at%. Moreover, 3 at% Cu-doped ZnO nanocages showed the highest response of 4733 for 5 ppm H2S at 200 °C, and the detection limit could be as low as 20 ppb. The gas-sensing mechanism was also discussed.Keywords:MOF-derived ZnO;nanocages;Cu doping;H2S sensing
研究领域:
材料科学
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传感器技术
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DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 16
·5988
·
IF 4.6
Li Fan,Hongliang Zhu,Kaili Wang,Hao Liu,Weina Hu,Xin Xu,Shancheng Yan
Treatment of organic wastewater is still a difficult problem to solve. In this paper, Cu-doped SnSe powder was synthesized by a convenient and efficient hydrothermal method. Meanwhile, the degradation effect of different doping concentrations of SnSe on methylene blue was investigated. It was found that at low doping concentrations, the degradation effect on methylene blue was not obvious because Cu was dissolved in the lattice of the SnSe matrix at low concentrations. As the doping concentration increased, SnSe changed from a layered structure to a nanocluster structure with reduced particle size, and a mixed phase of SnSe and Cu2SnSe4appeared. In fact, the degradation effect on methylene blue was significantly enhanced, and we found that the catalytic degradation effect on methylene blue was best at a doping concentration of 10 wt.%.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Jijun Guan,Liwei Wang,Fugang Xu,Guangran Ma
Ratiometric electrochemical probes are vital for reliable sensing but often suffer from complex preparation, reference molecule leakage, and single function. To address these limitations, this study reports a flower-like Cu-doped zeolite imidazolate framework (Zn 0.5 /Cu 0.5 /Co-ZIF) prepared at room temperature via simple stirring. This material acts as both an electrode material and a robust ratiometric probe for detecting catechol (CC) and acetaminophen (AP). Compared with pristine Zn/Co-ZIF, Cu doping confers several advantages: transforming lamellar Zn/Co-ZIF into a flower-like structure for enhanced electron and mass transfer; significantly improving redox current of CC/AP for high sensitivity; and generating a stable Cu-based redox signal as an internal reference, improving accuracy. The sensor achieved wide linear ranges (CC: 0.5–150 μM; AP: 0.2–300 μM) and low detection limits (CC: 0.12 μM; AP: 0.04 μM) for determination of phenol compounds. Compared to single-signal assay, the ratiometric approach showed lower RSDs and superior linear correlations. The sensor also achieved satisfactory simultaneous detection of CC and AP, along with accurate quantification in lake water samples. This work presents a facile strategy for a MOF based reference probe, offering a promising platform for stable and accurate ratiometric electrochemical sensors.
研究领域:
生物传感
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分析化学
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纳米材料
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环境监测
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电化学检测
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 43
·7020-7029
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IF 3.304
Xuehui Huang,Hongyun Pan,Kui Chen,Zhilin Yin,Jing Hong
A molten salt method has been used to prepare porous La0.8Sr0.2Mn1−xCuxO3 (0 ≤ x ≤ 0.4) (LSMC-X) microspheres and La0.8Sr0.2MnO3 (LSM) nanocubes using spherical and cubic MnCO3 as templates, respectively. XRD patterns showed a single perovskite phase when the Cu content was less than x = 0.3. SEM and TEM images indicated that the porous microspheres comprised many aggregated nanoparticles, while the nanocubes were solid with a smooth surface. LSM and LSMC-0 samples both possessed high surface areas (63.5045 and 49.6504 m2 g−1, respectively). Furthermore, the CO conversions showed that LSMC-0.2 had the best catalytic activity (T50 = 83.63 °C, T90 = 97.40 °C) and good stability. XPS analysis confirmed that Cu2+ doping induced Mn4+ formation and slight changes in the oxygen species, leading to different catalytic activity. Owing to their facile synthesis and high catalytic performance, we propose that these porous spherical La0.8Sr0.2Mn1−xCuxO3 (0 ≤ x ≤ 0.4) and nanocubic La0.8Sr0.2MnO3 catalysts are promising candidates for CO oxidation.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Zhipeng Zhang,Feifei Li,Guoqiang Li,Rui Li,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Lulu Zhang,Fangfang Li,Jianxin Liu,Caimei Fan
The bottlenecks of photocatalytic nitrogen fixation are adsorption and activation of nitrogen, because N–N bond in dinitrogen is one of the strongest bonds in chemistry . Herein, for the first time, Cu-doped MIL-101(Fe) was applications in photocatalytic nitrogen fixation. The photocatalytic nitrogen fixation activity of Cu-MIL-101(Fe) is three times that of MIL-101(Fe). Characteristic of MIL-101(Fe) and Cu-MIL-101(Fe) are systematically compared by XRD , SEM, TEM, BET, PL and energy band structure . These results indicated that the Cu doping not only enlarge the specific surface area from 1413 m 2 /g to 2097 m 2 /g, but also increase the photoreduction capability from −0.13 V to −0.7 V. These results indicated that nitrogen adsorption and activation capacity can be improved by Cu doping. By combining metal ions doping and components regulation of MOFs , this work provides many future opportunities for enhance photocatalytic nitrogen fixation activity.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 48
·10495-10499
·
IF 3.879
Shufang Kou,Tingting Yao,Xiaofeng Xu,Rui Zhu,Qing Zhao,Jian Yang
Successful doping of anisotropic semiconductor nanocrystals with impurities offers an effective pathway to manipulate their physical properties and enhance the application performances. However, such doping into anisotropic nanocrystals is seldom reported because it needs simultaneous controls in the crystal growth for a specific shape and composition engineering for transition-metal doping. Here, ultrathin Cu-doped ZnSe nanorods are synthesized by a growth–doping process. The doped nanorods are characterized by XRD and TEM techniques to reveal their crystal structure. Their optical properties are described in terms of UV-Vis absorption spectra and PL spectra. The tunable emission from 480 to 520 nm evidences the successful doping of Cu into ZnSe nanorods. The effects of the reaction time, the reaction temperature and the surface ligand on the optical properties are discussed in detail. After purification, the doped nanorods with a Cu/Zn ratio of 1% give a quantum yield of 7%. This emission could be retained for weeks in air, which is important for its future applications in many fields.
研究领域:
材料科学
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光学
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 28
·16984-16990
·
IF 3.108
Jian-Min Zhu,Tian Xia,Kang-Kang Yan,Wei-Jui Chang,Xue-Gang Chen,Ying Ye,Ping-Ping Zhang
LiFePO4 is an effective battery material which has gained global focus. In this study, we prepared a novel Cu+-doped Li[Fe0.9Cu0.1Li0.1]PO4/C cathode material via a carbothermal reduction method using glucose as carbon source. X-ray diffraction (XRD) patterns and Rietveld refinement on the samples are consistent with the orthorhombic phase and showed that the substituting Cu+ ions and excess Li+ ions occupy the Fe sites. The micro-morphology of the samples indicates that Cu+ doping can decrease the particle size and maintain the crystal structure of LiFePO4/C. XP spectra confirmed that the surface oxidation states of Fe and Cu are +2 and +1, respectively. The as-prepared Li[Fe0.9Cu0.1Li0.1]PO4/C composite exhibits enhanced initial discharge capacity (148.8 mA h g−1) compared to the un-doped LiFePO4/C. The discharge capacity remains at 149.8 mA h g−1 after 50 cycles at a rate of 0.2C, which displayed an excellent cycling stability. Furthermore, the cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) results showed that the Cu+-doped LiFePO4/C composite exhibits a higher lithium-ion diffusion coefficient and lower charge transfer resistance than the undoped counterparts. This study presents a novel Cu+-doped LiFePO4/C cathode material with enhanced electrochemical properties, which could be potentially applied as a battery material.
研究领域:
材料科学
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电化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Ziyi Li,Jia Xiong,Yufei Huang,Yangqiang Huang,Geoffrey I.N. Waterhouse,Ziyun Wang,Yu Mao,Zhiwu Liang,Xiao Luo
Photocatalytic CO 2 reduction reaction (CO 2 RR) is usually constrained by sluggish kinetics and low product selectivity. Herein, a Cu-doping multi-tier hierarchical S-scheme heterostructure Cu-ZnIn 2 S 4 /ZIF-67 was fabricated, achieving highly efficient photocatalytic CO 2 RR under visible light without additional thermal input. At low pressure (absolute pressure 40 kPa), the optimized catalyst 2Cu-ZISF demonstrated a CH 4 yield of 22.27 μmol g −1 h −1 with a selectivity of 94.7 %. In situ XPS and EPR confirmed that the photogenerated charge transfer obeys an S-scheme mechanism, with Cu sites serving as electron-rich centers, facilitating spatial charge separation. In situ DRIFT detected reaction intermediates of photocatalytic CO 2 RR mechanism, and Gibbs free energy calculations via Density Functional Theory revealed that Cu incorporation significantly stabilizes surface CO* species, thus reducing CO(g) production and facilitating hydrogenation, thereby acting as targeted active sites for CH 4 production. This work overcomes the limitations of slow reaction kinetics and offers an in-depth understanding of how to design effective S-scheme heterojunction photocatalysts and their charge transfer mechanisms.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ze Li,Wen-Jie Li,Jun Guo,Zi-Yuan Wang,Xing Yang,Yu-Ke Zhu,Tian-En Shi,Yi-Xin Zhang,Jing Feng,Zhen-Hua Ge
SnSe materials have attracted extensive attention in thermoelectrics due to their low thermal conductivity. Nevertheless, the thermoelectric properties of n-type polycrystalline SnSe are still low, and metallic Sn distributed in the SnSe1–x materials would affect the repeatability of thermoelectric performance. Herein, the thermoelectric properties of n-type polycrystalline SnSe0.95-based composites are highly enhanced by heterogeneous Cu doping. The carrier concentration of the SnSe0.95 material was optimized by SnCl2 doping. The strategy of heterogeneous Cu doping is employed in further improving the thermoelectric performance of the SnCl2-doped SnSe0.95 materials. In addition, partial Cu+ doping tunes the electron concentration to enhance the Seebeck coefficient. Moreover, metallic Sn distributed along the grain boundaries can be stabilized by forming Cu6Sn5 alloys, which improve the thermal stability of bulk composites. Excessive Cu particles and SnCl2 precipitates strengthen phonon scattering for lowering the lattice thermal conductivity. Ultimately, a peak ZT of 1.55 is yielded at 773 K in the SnSe0.95–1 wt % SnCl2–1 wt % Cu bulk composite, whose mechanical hardness is also increased. Hence, these results promote a feasible approach to simultaneously enhance the thermoelectric and mechanical properties of n-type SnSe-based composites, which might be worth exploring in other thermoelectric materials.
研究领域:
材料科学
·
热电学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Nan Xin,Yifei Li,Guihua Tang,Tian Lan,Jimin Xu,Xin Zhao,Min Zhang,Yinan Nie,Hao Shen
Thermoelectric materials have great potential in the energy recovery and environmental protection, and thermoelectric films can also effectively achieve heat dissipation of the chip through thermoelectric refrigeration. WS 2 films show good thermoelectric performance in prediction, but the figure of merit ( ZT ) of the synthesized WS 2 films still needs improvement. In this work, Cu was doped into WS 2 films by magnetron sputtering combined with chemical vapor deposition and sulfurization annealing. Cu doping narrowed the band gap and increased the hole concentration from 5.6 × 10 19 cm −3 to 2.2 × 10 21 cm −3 , greatly improved the electrical properties of WS 2 film. At 300 K, the electrical conductivity and power factor of Cu-doped films increased by 1086 % and 575 % compared to pristine WS 2 , respectively. In addition, Cu doping reduced the grain size and introduced more grain boundaries, which decreased the in-plane thermal conductivity to as low as 0.22 W m −1 K −1 at 300 K. The coupling of the electrical and thermal properties optimization greatly improved ZT . The ZT value of Cu 5.5 -WS 2 films is as high as 0.181 at 425 K. This work provides a new idea for improving the thermoelectric performance of transition metal dichalcogenides (TMDCs) films.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Hui Su,Shaojia Song,Songsong Li,Yangqin Gao,Lei Ge,Weiyu Song,Tianyi Ma,Jian Liu
Rational design of low-cost and efficient electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is imperative for renewable energy conversion. Herein, for the first time, a facile strategy is developed to synthesize M (M = Fe, Cu, Zn, Mo) doped bimetallic sulfide heterostructure Ni 3 S 2 /Co 3 S 4 electrocatalysts. The as-prepared bifunctional Cu-Ni 3 S 2 /Co 3 S 4 electrode exhibits excellent electrocatalytic activity for HER and OER in 1 M KOH electrolyte, and it requires only an overpotential of 79 mV (150 mV) to deliver 10 mA cm −2 (20 mA cm -2 ) current density for HER process. Moreover, it shows a considerable low cell voltage of 1.49 V at the current density of 10 mA cm -2 in a two-electrode configuration which is far surpassing most of the reported bifunctional metal sulfides. Meanwhile, besides increasing the specific surface area of the electrocatalyst by optimizing the microstructure, the introduction of Cu cation could also stimulate the formation of high-valent Ni/Co sites, which can be verified by XPS technique. Density function theory calculations demonstrate that the Cu-doping boosts the formation of high valent Co sites and enhances the charge transfer performance of Ni and Co species, thus promotes intrinsic catalytic activity through modulating the d-band center of Co and reducing the adsorption energy of H and O-containing intermediates (H*, OH*, OOH*) on the surface of the catalyst. This work suggests the importance of exploitation of transition metal ion-doping for promoting the electrocatalytic activity of bimetallic sulfides.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Tongyang Zhang,Aihua Yan,Sen Luo,Fei Huang,Jixu Zhang,Ye Gao,Wenxue Zhao,Ziwu Liu,Xianhui Zhao
Photocatalytic technology still faces enormous challenges to design and synthesize highly efficient photocatalytic materials with a high electron/hole separation efficiency, rapid charge migration, low carrier recombination rate, and strong visible light-harvesting capability. Herein, Cu-doped ZnIn2S4/NixP (marked CuyZIS/NP) composites were successfully synthesized by a simple two-step method. The synergistic effect of Cu2+ doping and the NixP cocatalyst on hydrogen evolution performance was investigated in detail. The results showed that superior photoactivity over CuyZIS/NP composites was achieved. The optimal Cu0.5ZIS/NP-1/2 sample had a hydrogen evolution rate of 4746.3 μmol·g–1·h–1 under visible light irradiation, which was approximately 15.98 times higher than that of pure ZnIn2S4 (297 μmol·g–1·h–1). This work may offer a valuable insight into understanding the synergistic effect of doping and cocatalysis and provide a guideline for designing and developing highly efficient visible light-driven photocatalysts toward a water splitting system.
研究领域:
材料科学
·
能源化学
·
环境科学
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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）