International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chunyong Zhang,Lei Su,Linna Huang,Jiehong Cheng,Jianning Li,Hengfei Qin
The carbon nanofiber composite containing Cu and MnO was fabricated by electrospinning method. The precursor solution was prepared by mixing Cupric Acetate Monohydrate, Manganous acetate, N,N-dimethylformamide (DMF) and polyacrylonitrile in a certain proportion. Then the material of Cu- MnO/CNF with higher capacitance was prepared by electrostatic spinning at 15 kV and high temperature heat treatment. The Cu-MnO/CNF was characterized by scanning electron microscopy (SEM) and X-Ray diffraction (XRD). It’s clear from the results that, carbon nanofiber had overlaped by metal oxides and metals, at the same time, the Cu(OAc) 2 was converted to Cu and the MnACAC was turned into MnO after thermal treatment. Through a series of electrochemical tests, it showed the Cu-MnO/CNF has excellent electrochemical performance and indicated its potential advantages for supercapacitors. The results indicated the specific capacitance of the Cu-MnO/CNF displayed a larger specific capacitance of 581 F/g than the electrical capacity of Cu-CuO/CNF and MnO-Mn(OH) 2 /CNF
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Zhongwei Ge,Chenglei Wang,Tao Chen,Zhiyan Chen,Tong Wang,Liang Guo,Genggeng Qi,Jianqiang Liu
It has been reported that doping ZnO with metal ions can alter the band gap and immensely enhance electron transport . In this regard, to increase the efficiency of cost-effective dye-sensitized solar cells (DSSCs), we synthesized Cu-doped ZnO nanocomposites from layered double hydroxide (LDH) precursors via a facile method. LDH layers were homogeneously doped with Cu ions , and mixed metal oxides (MMOs) were obtained after annealing. The morphology and optical and electrochemical properties of the as-synthesized Cu-doped ZnO nanocomposites were systematically studied. The introduction of Cu ions increases the specific surface area of ZnO and increases light absorption in the visible region. The Cu-doped ZnO MMOs were used as the photoanode of DSSCs, and the effect of the amount of the Cu dopant on the performance of the solar cells was studied. At the optimal doping weight percentage of Cu (0.25 wt%), the solar cell based on Cu-doped ZnO MMO and D149 dye achieved the highest short-circuit current of 7.12 mA cm −2 and the highest power conversion efficiency of 1.50%.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 7
·1-11
·
IF 4.3
Chen Yi,Chen Shaowei,Shao Yan,Quan Cui,Gao Ningbo,Fan Xiaolei,Chen Huanhao
Electrified non-thermal plasma (NTP) catalytic hydrogenation is the promising alternative to the thermal counterparts, being able to be operated under mild conditions and compatible with green electricity/hydrogen. Rational design of the catalysts for such NTP-catalytic systems is one of the keys to improve the process efficiency. Here, we present the development of siliceous mesocellular foam (MCF) supported Cu catalysts for NTP-catalytic CO 2 hydrogenation to methanol. The findings show that the pristine MCF support with high specific surface area and large mesopore of 784 m 2 ·g −1 and ∼8.5 nm could promote the plasma discharging and the diffusion of species through its framework, outperforming other control porous materials (viz., silicalite-1, SiO 2 , and SBA-15). Compared to the NTP system employing the bare MCF, the inclusion of Cu and Zn in MCF (i.e., Cu 1 Zn 1 /MCF) promoted the methanol formation of the NTP-catalytic system with a higher space-time yield of methanol at ∼275 µmol·g cat −1 ·h −1 and a lower energy consumption of \(26.4\ \text{kJ}\cdot \text{mmol}_{\text{CH}_{3}\text{OH}}\!^{-1}\) (conversely, ∼225 µmol·g cat −1 ·h −1 and \(\sim71\ \text{kJ}\cdot \text{mmol}_{\text{CH}_{3}\text{OH}}\!^{-1}\) , respectively, for the bare MCF system at 10.1 kV). The findings suggest that inclusion of active metal sites (especially Zn species) could stabilize the CO 2 /CO-related intermediates to facilitate the surface reaction toward methanol formation.
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Advanced Optical Materials
·
2023
·Vol. 12
·期 9
·2302063
·
IF 9
Yakun Hu,Jiance Jin,Kai Han,Zhiguo Xia
Doping in luminescent metal halides has become an effective strategy for tailoring the optoelectronic properties. Herein, Cu + is introduced into Rb 2 AgBr 3 to design the synthesis of Rb 2 AgBr 3 : x Cu + , which possess cold-white light emission at room-temperature without changing the spectral profiles; however, the Cu + incorporation significantly enhances the photoluminescence quantum efficiency to 98.8% in Rb 2 AgBr 3 :0.05Cu + . Additionally, a high scintillation light yield of up to 79 250 photons MeV −1 and a low detection limit of 714.83 nGy s −1 have been achieved via this Cu + doping engineering. X-ray imaging with a spatial resolution of up to 5.8 lp mm −1 is further realized using a large scintillator film prepared by mixing polydimethylsiloxane with Cu + doped Rb 2 AgBr 3 scintillators. This study provides a Cu + doping design principle for improving both the photoluminescence and scintillation performances of metal halides.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yue Tian,Xiaoyan Liu,Xiaoqing Cao,Dieqing Zhang,Shuning Xiao,Xinru Li,Zaiyuan Le,Xianyang Li,Hexing Li
1T MoS 2 has recently attracted growing interests for energy storage due to the excellent conductivity, expanded layer space and extra exposed active sites. However, its application is still limited due to the complicated synthesis under harsh condition and poor structural stability. Herein, we report a novel MoS 2 /Cu nanowires (NWs) by microwave-assisted self-assembly of ultrathin 1T MoS 2 onto Cu NWs with interconnected conductive network and robust one-dimensional (1D) structure. As anode material for LIBs, 1T MoS 2 /Cu NWs exhibits high capacity and stability owning to the enhanced electron transport and lithium ions intercalation. Meanwhile, the enriched nanovoids supply extended space for buffering the volume change and boosting electrolyte penetration during cycling process. Moreover, Cu doped MoS 2 could also stabilize the 1T phase, leading to the excellent anode durability. It delivers a high reversible capacity of 570.6 mAh g −1 after 250 cycles at a current density of 0.5 A g −1 . Enhanced rate performance is also achieved with excellent capacity retention of 914.6 mAh g −1 at 0.1 A g −1 and 465.2 mAh g −1 at 2 A g −1 , respectively.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Jinrui Li,Zhongxin Zhuang,Zheng Guo,Zhonggang Liu,Xingjiu Huang
Exploiting advanced bimetallic oxide as sensing materials for electroanalysis offers new opportunity to improve the electrochemical performance, but still presents a tough challenge. Herein, we synthesized the uniform Fe 2 O 3 /Mn 3 O 4 nanocubes from a framework structure in a facile approach, which were developed as the electrochemical catalyst for individual and simultaneous analysis of Cu(II) and Hg(II) in 0.1 M HAc-NaAc buffer solution (pH5.0). It showed the excellent electrochemical behavior for the simultaneous analysis Cu(II) and Hg(II) with high sensitivities of 69.29 and 190.55 μA μM cm −2 . The corresponding limit of detection values (LODs) were calculated to be 3.94 nM and 1.39 nM, respectively. The excellent electrochemical behavior of Fe 2 O 3 /Mn 3 O 4 could be attributed to the large specific surface area, which could provide a large number of adsorption sites for Cu(II) and Hg(II). Meanwhile, the bimetallic Fe and Mn atoms arranged in the porous nanocubes could offer a synergistic effect and improve the electrochemical activity. Moreover, it could be successfully applied for the simultaneous analysis of Cu(II) and Hg(II) in real water samples with the favorable recovery rate. The results confirmed that the Fe 2 O 3 /Mn 3 O 4 nanocubes could serve as a reliable platform for the simultaneous analysis of Cu(II) and Hg(II).
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Chemical Engineering Journal Advances
·
2023
·
IF 0
Hongchao Li,Na Yuan,Chuan Wang,Xiaofei Yan,Jieshu Qian
Transition metal oxides have been recognized as promising catalysts for the activation of peroxymonosulfate (PMS), while the underlying mechanism involved in the relevant processes remains obscure. Here, we identify the reactive species generated in the CuFe 2 O 4 /PMS process and illustrate their roles in the degradation of aromatic compounds with different substituent groups (i.e., phenol and benzoic acid). Experimental results showed that free radicals (i.e., sulfate radicals (SO 4 •− ) and hydroxyl radicals (HO • ), surface Cu(III) species, and singlet oxygen ( 1 O 2 ) coexist in the CuFe 2 O 4 /PMS process. The free radicals are mainly responsible for the oxidation of aromatic compounds with electron-withdrawing group (i.e., benzoic acid), while the surface Cu(III) is the major reactive species for the removal of aromatic compounds with electron-donating group (i.e., phenol). In addition, 1 O 2 plays a negligible role in the oxidation of both benzoic acid and phenol. This study enhances the fundamental understanding of the underlying mechanism involved in the transition metal oxides-catalyzed PMS activation process.
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ULTRASONICS SONOCHEMISTRY
·
2019
·
IF 7.279
Baosong Li,Tianyong Mei,Dandan Li,Shengsong Du
Ni-Cu/TiN nanocomposites were electrodeposited by incorporation of TiN nanoparticles in Ni-Cu matrix from sulphate-citrate bath with additives. Ultrasonic assistance was performed in an external ultrasonic bath at ultrasonic frequency of 40 KHz and acoustic power of 300 W. The effects of current density on surface morphology, structural and electrochemical properties of Ni-Cu/TiN nanocomposites were examined. Results indicated that the presence of TiN changes the texture of nickel coating. Corrosion resistance of the composite deposit was enhanced by ultrasonic-assisted electrodeposition. The average roughness value ( R a ) of Ni-Cu/TiN is 26–34 nm, which is rougher than Ni-Cu alloy ( R a = 4–5 nm). Not only the ultrasonic agitation, but also the current density affects the corrosion properties of the products. Ni-Cu/TiN nanocomposite electrodeposited at 5 A dm −2 has the highest corrosion resistance.
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高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Lumin Chen,Houyong Yu,Christopher Deutschman,Ting Yang,Kam Chiu Tam
We report a facile method to prepare a novel composite based on Fe-Cu alloy decorated cellulose nanocrystals (Fe-Cu@CNC) via simple oxidation-reduction reaction. Spherical zero-valent iron nanoparticles (NZVI) and sheet-like copper nanoparticles were serially anchored on the CNC surface, and the generated composite exhibited excellent antibacterial activities and highly efficient Pb 2+ removal. The composites had high antibacterial ratios of 95.9 %–99.9 %, because superoxide radicals can cause irreversible damage to the bacteria, eventually leading to apoptosis and bacterial death. Meanwhile, the Fe-Cu@CNC composite showed quick Pb 2+ ion removal, reaching a 70.76 % removal within 5 min, a total removal of 93.98 % after 1 h, and excellent reusability (retaining removal efficiency of 80.41 % after six cycles). The adsorption kinetics demonstrated that the adsorption behavior can be described by pseudo-second-order kinetic model (R 2 >0.99). This study offers a new strategy to prepare a promising composite with advanced antibacterial and heavy metal removal properties for wastewater treatment.
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2022
·
IF 5.62
Yuhong Cui,Shenghua Xue,Xin Chen,Wei Bai,Shujuan Liu,Qian Ye,Feng Zhou
Herein, the MXene@Cu nanocomposites were prepared via electrostatic adsorption of Cu 2+ and then in-situ reduction. The Cu 2+ is uploaded on the surface of MXene nanosheets via electrostatic adsorption, which was followed by in-situ reduction with NaBH 4 to obtain Cu nanoparticle attached MXene (MXene@Cu) hybrids. The results revealed that the friction coefficient of MXene@Cu decrease from 0.434 to 0.110 and the wear volume loss decreased by 88.1% via changing the loading amount of Cu nanoparticles. The excellent tribological performance of MXene@Cu is attributed to the synergistic effect of MXene nanosheets and Cu nanoparticle , which can adsorb on the surface of friction pair and induce tribochemical reaction. A stable protective film is formed on the worn surface, thereby reducing fiction and wear.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Haiyu Li,Hua Bai,Qing Lv,Wan Wang,Zhijuan Wang,Hong Wei,Qing Zhang
Quantum dots (QDs) have been widely used to develop analytical methods due to their unique fluorescent and photoelectrochemical characteristics. However, analytical strategies based on their catalytic property are rarely reported. Here, we demonstrate that the photoreductive ability of QDs can be utilized to develop a sensitive and selective colorimetric sensor for Cu(II). By using UV irradiation , 3,3′,5,5′-tetramethylbenzidine (TMB) is oxidized to its oxidation product, which can be reduced back to TMB by QDs. The presence of Cu(II) decreases the reductive activity of QDs and results in a color change in a signal-on format. The proposed sensor can be activated using a portable UV lamp or direct sunlight. Under optimized conditions, the detection limit (S/N = 3) is 10 nM via spectrophotometry and 0.1 μM by visible color change. This sensing system was applied to quantify Cu(II) in real samples, such as river water and tap water . Results were in agreement with those obtained using inductively coupled plasma spectrometry (ICP). This study may provide new ideas for the development of QD-based sensors.
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高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Yurong Luo,Hao Li,Muzhi Cai,Yuan Liu,Liang Chen,Shiqing Xu,Gongxun Bai
Cu 2+ is an essential trace element for humans and animals, and the precise detection of Cu 2+ can help diagnose many diseases. However, the current Cu 2+ detection technology still needs to be improved in terms of the biocompatibility of the material, the penetration of the excitation source, and the detection limit. In this paper, the polyacrylic acid (PAA) capped NaYF 4 :Yb 3+ /Er 3+ @NaYF 4 core–shell nanoparticles (NPs) with a particle size of about 22.5 nm is proposed. Under the excitation of 980 nm with strong penetration, the Cu 2+ concentration can be detected by the emission intensity of NPs at 520 nm, and the detection limit is 0.018 μM. In addition, this material can also perform temperature detection within 296–373 K with a relative sensitivity of 1.23 % K −1 . Therefore, this NPs is a promising multifunctional material that can detect temperature and Cu 2+ concentration.
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