ChemElectroChem
·
2018
·Vol. 6
·期 3
·714-723
·
IF 4.446
Haoyang Tian,Jintao Liang,Xuli Ma,Lele Cao,Xueyan Hu,Mengting Gao,Huimin Yang,Zhenhai Liang
Graphical Photo finish : A catalyst made of MoS 2 nanosheets loaded on Cu-doped CdS nanorods is synthesized through a facile two-step solvothermal approach. The working electrode is formed by loading a certain amount of catalyst on fluorine tin oxide. A significant increase in the photoelectrochemical performance is observed, owing to the synergistic effect between CdS and MoS 2 and fast interfacial charge transfer from the Cu 2+ doping. Transition-metal ion doping and efficient decoration by using a co-catalyst have been proven to effectively inhibit the recombination of photogenerated electron-hole pairs and broaden the visible-light response region. Here, we have constructed MoS 2 nanosheets decorated on a copper-doped CdS nanorod composite as a noble-metal-free photoelectrocatalyst. This kind of composite material was constructed through a simple solvothermal method. The morphology, structure, chemical states, photoelectrochemical properties, and other properties were tested by using a diverse range of analytical techniques. Owing to the Cu 2+ doping and the excellent electron-capturing ability of MoS 2 , 5 % MoS 2 /Cu−CdS (with 7 % Cu 2+ doping in CdS) exhibits excellent hydrogen evolution reaction with a rate of 10.18 mmol h −1 g −1 , which is about 48 times higher than that of pure CdS. A significant increase in the photoelectrochemical performance of the composite catalytic material benefits from the synergistic effect between CdS and MoS 2 and fast interfacial charge transfer, owing to the Cu 2+ doping. These findings provide a new thought for further research of the ion doping in photoelectrocatalytic field.
研究领域:
材料科学
·
能源化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Liang Yan,Bing Zhang,Zhonggang Liu,Junlu Zhu
The development of highly active and low-cost oxygen evolution reaction (OER) electrocatalysts is pivotal for the efficient generation of renewable hydrogen but still challenging. Heteroatom doping and oxygen vacancy (Ov) engineering are effective strategies to regulate the physical and chemical properties of the catalysts and thus facilitating the intermediates absorption/desorption. Herein, the rational design of Cu doping CoOOH porous nanoplates with rich Ov grown on carbon fiber paper (Cu-CoOOH/CFP) is performed to enhance the OER performance. Experiment results and density functional theory (DFT) calculations uncovered that the synergistic effect of Cu doping with Ov exceptionally modulated the electronic structure of Cu-CoOOH/CFP so that enormously facilitates the (O–H)* bond cleavage and optimize the Gibbs free energies of OER intermediates, thus contributing to fast kinetics and outstanding OER activity. As expected, the optimized three-dimensional (3D) self-supported Cu-CoOOH/CFP with unique porous structure shows unprecedented OER activity with a low overpotential of 234 mV to attain a current density of 10 mA cm −2 , as well as superior stability in 1.0 M KOH. This work provides an effective electronic engineering approach for the rational design of nonprecious-metal and efficient electrocatalysts for water oxidation and beyond.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Bio
·
2024
·
IF 8.7
Hui Yang,Sirui Huang,Xinwei Zhu,Yasi Chen,Chunming Xu,Ruohan Li,Pan Bu,Yufan Jiang,Changwei Li,Jie Yang,Zhenyi Chen,Weijie Peng,Lin Liu
Critical-sized bone defects present a formidable challenge in tissue engineering, necessitating innovative approaches that integrate osteogenesis and angiogenesis for effective repair. Inspired by the hierarchical porous structure of natural bone, this study introduces a novel method for the scalable production of ultra-long, copper-doped hydroxyapatite (Cu-HAp) fibers, utilizing the rapid gelation properties of guar gum (GG) under controlled conditions. These fibers serve as foundational units to fabricate three-dimensional porous scaffolds with a biomimetic hierarchical architecture. The scaffolds exhibit a broad pore size distribution (1–500 μm) and abundant nanoporous features, mimicking the native bone extracellular matrix. Physicochemical characterization and in vitro assays demonstrated that the copper doping significantly enhanced osteogenic and angiogenic activities, with optimized concentrations (0.8 % and 1.2 % Cu) facilitating the upregulation of osteogenesis-related genes and proteins, as well as promoting endothelial cell proliferation. In vivo studies further confirmed the scaffolds' efficacy, with the 1.2Cu-HAp group showing a remarkable increase in bone regeneration (bone volume/total volume ratio: 35.7 ± 1.87 %) within the defect site. This research offers a promising strategy for the rapid fabrication of multifunctional scaffolds that not only support bone tissue repair but also actively accelerate the healing process through enhanced vascularization.
研究领域:
生物材料学
·
组织工程学
·
医学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Di Li,Qin Li,Yimeng Zhou,Qiong Zhang,Qianjin Ye,Ran Yang,Deli Jiang
Steering selectivity in photocatalytic conversion of CO2, especially toward deep reduction products, is vital to energy and environmental goals yet remains a great challenge. In this work, we demonstrate a facet-dependent photocatalytic selective reduction of CO2 to CH4 in Cu-doped TiO2 catalysts exposed with different facets synthesized by a topological transformation from MIL-125 (Ti) precursors. The optimized round cake-like Cu/TiO2 photocatalyst mainly exposed with the (001) facet exhibited a high photocatalytic CO2 reduction performance with a CH4 yield of 40.36 μmol g–1 h–1 with a selectivity of 94.1%, which are significantly higher than those of TiO2 (001) (4.70 μmol g–1 h–1 and 52.6%, respectively), Cu/TiO2 (001 + 101) (18.95 μmol g–1 h–1 and 69.6%, respectively), and Cu/TiO2 (101) (14.73 μmol g–1 h–1 and 78.9%, respectively). The results of experimental and theoretical calculations demonstrate that the Cu doping dominating the promoted separation and migration efficiencies of photogenerated charges and the preferential adsorption on (001) facets synergistically contribute to the selective reduction of CO2 to CH4. This work highlights the significance of synergy between facet engineering and ion doping in the design of high-performance photocatalysts with respect to selective reduction of CO2 to multielectron products.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2021
·Vol. 11
·期 31
·2101230
·
IF 29.368
Hongyang Zhao,Xin Li,Mengke Cai,Cheng Liu,Yimin You,Rui Wang,Ali Imran Channa,Feng Lin,Da Huo,Guofeng Xu,Xin Tong,Zhiming M. Wang
As emerging eco-friendly alternatives to traditional Cd/Pb-based quantum dots (QDs), InP/ZnSe(S) core/shell QDs have demonstrated huge potential in light-emitting technologies. So far, these QDs have been rarely employed in solar energy conversion applications due to their type-I band structure offering limited photo-induced charge carrier separation and transfer. Here, a controllable Cu shell doping approach is reported to engineer the optoelectronic properties of InP/ZnSe core/shell QDs and realize high performance and stable solar-driven photoelectrochemical (PEC) hydrogen evolution. As compared to the pristine InP/ZnSe QDs, the Cu-doped core/shell QDs exhibit enhances the photo-induced electron transfer rate due to the capture of photo-generated holes via Cu impurity states in the shell, leading to improved photocurrent density and long-term durability in as-fabricated InP/ZnSe:Cu QDs-PEC devices under standard one sun illumination. The results indicate that the doping of Cu in the shell has a preeminent effect on the optoelectronic properties of the core/shell QDs and may open up new avenues to tailor eco-friendly core/shell QDs for high performance and stable solar energy conversion.
研究领域:
材料科学
·
能源转换技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Kang Ye,Ziye He,Fengxi Wu,Yumin Wang,Lu Wang,Yong Cheng,Ying-Hua Zhou
Development of an efficient catalyst for ammonia preparation through electrochemical nitrogen fixation is significant and desirable to relieve the tremendous energy-consumption by the conventional Haber-Bosch process. Herein, the abundant oxygen vacancy-containing CuCeO 2 @NC composite (denoted as Cu-doped CeO 2 nanoparticles supported on carbon nitride) was fabricated by annealing melamine-incorporated metal-organic framework (MOF) of CuCe-BTC (BTC = 1,3,5-benzenetricarboxylic acid) under the reducing atmosphere of 10% H 2 /Ar. The optimized composite of Cu 0·1 CeO 2 @NC achieved a high selectivity and an outstanding electrocatalytic activity with NH 3 yield rate of 44.5 μg h −1 mg cat. −1 at −0.5 V versus a reversible hydrogen electrode , surpassing most of the reported electrocatalysts and its analogues without copper and nitrogen atoms as dopants . The favorable performance of Cu 0·1 CeO 2 @NC would be ascribed to the synergistic effect of the rich oxygen vacancies and the optimal electrical structure induced by heteroatom doping, further confirmed by X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) spectroscopy, and Raman spectra . Moreover, the great electrochemical selectivity and durability for the longtime electrolysis had been demonstrated. This work offered an insight that the electrocatalytic performance would be regulated by heteroatomic dopants and oxygen vacancy toward MOF-derived materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yunjia Hu,Tengchao Guo,Kangsen Peng,Shujuan Tan,Cheng Xu,Jie Deng
In this study, Ce 1−x Cu x O 2−x (x = 0, 0.01, 0.03, 0.05, 0.07) samples were prepared by hydrothermal method . The structure, microstructure, and elemental composition of the powders were characterized by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy, whereas the electrical conductivity , ultraviolet–visible absorption spectroscopy , and infrared emissivity at 3–5 μm were measured as well. Moreover, the effects of Cu 2+ doping concentration on the microstructure, morphology, bandgap, conductivity, and infrared emissivity of Cu-doped CeO 2 powders were systematically studied. The effects of Cu 2+ doping on infrared reflection and absorption in a 3–5 μm band and their mechanisms were explained based on electromagnetic theory, lattice vibration absorption, and free carrier absorption . Our result indicated that the emissivity of 1% Cu-doped powder reached the lowest emissivity of 0.200 at 800 °C. When the doping concentration was above 1%, the curve of infrared emissivity versus temperature exhibited a “U” shape, with the minimum point shifting towards the low-temperature region with the increase of Cu doping amount. This phenomenon was attributed to the different enhancement amplitude of reflectivity and absorbance of CeO 2 powder by Cu 2+ at different temperatures.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 4
·期 3
·581-588
·
IF 4.696
Sheng Cao,Wenyu Ji,Jialong Zhao,Weiyou Yang,Chengming Li,Jinju Zheng
Recently, Cu-doped ternary chalcogenide quantum dots (QDs) have attracted extensive attention due to their large Stokes shift and tunable photoluminescence (PL) behavior in the visible and near-infrared (NIR) spectral range, and particularly for their remarkably lower toxicity than their Cd-based counterparts. However, there still remain material- and fabrication-related obstacles in realizing high-performance Cu-doped QDs, which limit their promising applications in light-emitting devices and bio-labeling. In the present study, we report the facile synthesis of high-qualified Cu-doped Zn–In–Se QDs via a hot injection approach, using a heterogeneous dispersion of Se in octadecene (ODE) as a “green” Se precursor. With variation of the ratios of Zn to In, the obtained Cu-doped Zn–In–Se QDs exhibited composition-tunable PL emissions over the most visible spectral window (ca. 565–710 nm) with a PL quantum yield (QY) up to 38% after coating ZnSe shells, which is the highest one ever reported in this system. Furthermore, we report, for the first time, the exploration of QD light-emitting diodes (QD-LEDs) based on the Cu-doped Zn–In–Se QDs as the active layer, which had a maximum luminance of 320 cd m−2 and a luminous efficiency (LE) of 0.97 cd A−1 (at 98 cd m−2), suggesting their promising potential for application in optoelectronic devices.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhiwei Wang,Yue Zhang,Fengmin Li,Haixiang Han,Chunhua Xu
Sulfidation of zero-valent iron (SZVI) is an important means to greatly inhibit the formation of inert hydr/oxide and improve the overall reactivity in pollutant removal reactions, which is mainly benefiting from the formation of FeS x layer on surface of the zero-valent iron (ZVI). However, FeS x phase can act as reducing reagent in the treatment of pollutants, resulting in inevitable consumption. Considering that, copper cation was introduced to the FeS x phases to prepare copper-doped sulfides with improved durability. In this study, we successfully prepared copper-doped SZVI (Cu-SZVI). The composition and structure have been clearly confirmed by a combination of several techniques, including Raman spectroscopy and X-ray powder diffraction. Cu-SZVI exhibits a superior sequestration reaction to remove Cr(VI) with higher removal capacity of 82.93 mg/g, with the comparison of SZVI (57.54 mg/g) and ZVI (8.23 mg/g). Moreover, Cu-SZVI possesses better operational pH tolerance and longer lifetime of usage, which makes it particularly attractive to large-scale environmental applications. This work proposes a new way to modify SZVI by doping a secondary cation, which can be used to further explore new SZVI materials based on specific needs.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Jinxin Wang,Guicheng Jiang,Weicheng Huang,Danqing Liu,Bin Yang,Wenwu Cao
PbTiO 3 (PTO) and Cu-doped PbTiO 3 thin films were deposited on the fluorine doped tin oxide (FTO) by a sol-gel route. Detailed investigations were made on the effects of Cu doping on the crystal structure and ferroelectric properties of the thin films. With increasing Cu amount, the crystal structure of Cu-doped films gradually transits from tetragonal to pseudo-cubic phase. Worth mentioning, the Cu-doped can induce a superior giant remnant polarization of ∼55.7 μC/cm 2 and a relatively low coercive field of 304 kV/cm when the molar concentration of Cu in the sol is 0.02. The experimental results show that Cu-doped PbTiO 3 is very a promising candidate for ferroelectric random access memory (FERAMs) applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 7
·2803-2812
·
IF 2.817
Pei Mengchun,Qi Zhiqiang,Wu Yuandong,Mei Dajiang,Wen Shaoguo
A copper-doped lithium-ion battery anode material Cu 0.5 Ni 0.5 Co 2 O 4 was obtained through simple hydrothermal synthesis and assisted by high-temperature calcination. Metal-organic framework was introduced into the precursor, and after calcination at 500°C, a porous nano-particle material with the specific surface area of 41.68 m 2 g −1 was obtained. With the assistance of metal-organic framework, the prepared material can effectively alleviate the volume expansion problem generated during the charge/discharge process and improve the electrochemical performance. More importantly, the Cu 0.5 Ni 0.5 Co 2 O 4 electrode material not only maintains good cycle stability but also has a high charge/discharge specific capacity. The material can remain 1347.93 mAh g −1 after 200 cycles at the current density of 1000 mA g −1 , and has a high discharge specific capacity of 1846.50 mAh g −1 in the first cycle at the current density of 1000 mA g −1 . Benefit from the structural features, the resultant Cu 0.5 Ni 0.5 Co 2 O 4 electrode material exhibits good electrochemical performance with remarkable specific capacities (1411.36–919.76 mAh g −1 ) at various current densities (50–1000 mA g −1 ).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Gongxi Qiao,Zhi Zeng,Jinwei Gao,Yiping Tang,Qianming Wang
Hybrid organic-inorganic perovskites are a new class of photoluminescent and low-cost nanomaterials . Chemical transformation using less-toxic elements under ambient reaction conditions has emerged as a major issue due to pressures on environment and human health. Herein, the synthesis of copper-incorporated CH 3 NH 3 Pb 1-x Cu x Br 3 based on a ligand-assisted reprecipitation (LARP) technique has been reported. The achieved quantum dots have an average size of 8 nm and the existence of copper has been verified by morphological studies. The nanoscale particles exhibited strong blue luminescence upon the excitation at 370 nm. The replacement by Cu 2+ resulted in emission evolution from 468 to 513 nm and the photophysical properties were discussed. This study will open a new approach to control the fluorescence of perovskite-type quantum dots, which will extend its application in different areas.
研究领域:
材料科学
·
光学
✓ 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）