JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xin Wang,Zhurong Liang,Xueqing Xu,Nan Wang,Jun Fang,Junxia Wang,Gang Xu
Highly Cu-rich copper indium sulfide (CuInS 2 , CIS) quantum dots were synthesized utilizing copper chloride (CuCl) and indium acetate (In(Ac) 3 ) as metal cation precursors, combined with n-dodecanethiol (DDT) as a coordinating sulfur source and solvent. With excess of In(Ac) 3 , i.e. with Cu/In ratios of 1/4, together with Zn 2+ ions post-treatment, a relatively high photoluminescence quantum yield (QY) of ∼73% with long average lifetime of ∼359 ns has been obtained, which is proposed to be attributed to the Cu-rich defect states in the CIS nanocrystals (NCs) nuclei. Meanwhile, the formation of In-rich CIS–ZnS alloy, i.e. Zn–Cu–In–S (ZCIS) with high density of Cu vacancies, combined with the surface passivation of ZnS overlay resulted in a high QY. Finally, the formation mechanism of the ZCIS/ZnS with Cu-rich nuclei has been proposed.
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高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Xiuli Li,Yuan Tan,Zongyang Liu,Juan Su,Yan Xiao,Botao Qiao,Yunjie Ding
Chemoselective hydrogenation of aromatic nitro compounds to the corresponding anilines is an environmentally benign technology for the production of key intermediates in manufacturing of pharmaceuticals, agrochemicals, dyes and fine chemicals. Non-noble metal Cu-based catalysts have been reported as a low-cost alternative but suffer from poor activity. Herein, by fabricating nickel oxide promoted Cu catalysts, a promoted activity was obtained in supported Cu-Ni bimetal catalyst system. Characterizations such as H 2 -TPR and XPS indicate a strong interaction between Cu and Ni, which contributes to its high activity and selectivity in hydrogenation of p -chloronitrobenzene ( p -CNB) to p -chloroaniline ( p -CAN). Control experiments suggest that either monometallic copper or pure nickel oxide is less active for the reaction but the interaction of NiO x with Cu generates much more active species, resulting in significantly improved catalytic reactivity and selectivity. The activity was found to be highly dependent on the contents of Cu 0 & Cu + in Cu-Ni bimetal catalyst, as the specific reaction rates for hydrogenation of p -CNB grew linearly with the increment of Cu 0 & Cu + loadings. Kinetic studies and in-situ DRIFTS of p -CNB imply the 10Cu-5Ni/AlSBA-R catalyst possesses good capacity for the activation of hydrogen and nitro group, leading to high p -CNB conversion and p -CAN production. The present work provides a good example for understanding the interaction between Cu and nickel oxides, and helps to develop highly efficient non-noble metal catalysts for selective hydrogenation of aromatic nitro compounds to corresponding anilines.
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ACS Omega
·
2022
·
IF 4.132
Xiaoting Deng,Min Lao,Zhenqin Li,Shaofeng Yin,Feng Liu,Zhiyong Xie,Yili Liang
A flexible carbon nanofiber film with high conductivity was prepared by electrospinning, and then Cu was uniformly deposited on the fiber film by pulse electrodeposition to prepare Cu nanocrystal/carbon nanofiber film. Cu@PtCu/carbon nanofiber (Cu@PtCu/CNF) catalytic films were synthesized by in-situ substitution reduction. The Cu@PtCu/CNF catalytic film solves the problem of uneven activity of the catalytic layer and can be directly used as the catalytic layer. The morphology and structure were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Electrochemical test results show that the Cu@PtCu/CNF catalytic films obtained at the chloroplatinic acid concentration of 0.5 mg·mL–1 (N2) exhibited 2.5 times specific activity when compared with commercial Pt/C catalysts. After 5000 cycles of stability test, the electrochemical surface areas (ECSAs) were still maintained at 80%, and the half-wave potential decreased by 11 mV, which was better than those of commercial Pt/C catalysts.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 27
·6006-6016
·
IF 4.857
Shien Pei,Jianfeng Guo,Zhishun He,Liang-ai Huang,Tongzhou Lu,Junjie Gong,Haibo Shao,Jianming Wang
Graphical Sharing a shell : Porous Si-Cu 3 Si-Cu microsphere@C core–shell composites fabricated by an etching/electroless deposition and subsequent carbon coating show excellent lithium storage performance. Low-cost Si-based anode materials with excellent electrochemical lithium storage present attractive prospects for lithium-ion batteries (LIBs). Herein, porous Si-Cu 3 Si-Cu microsphere@C composites are designed and prepared by means of an etching/electroless deposition and subsequent carbon coating. The composites show a core–shell structure, with a porous Si/Cu microsphere core surrounded by the N-doped carbon shell. The Cu and Cu 3 Si nanoparticles are embedded inside porous silicon microspheres, forming the porous Si/Cu microsphere core. The microstructure and lithium storage performance of porous Si-Cu 3 Si-Cu microsphere@C composites can be effectively tuned by changing electroless deposition time. The Si-Cu 3 Si-Cu microsphere@C composite prepared with 12 min electroless deposition delivers a reversible capacity of 627 mAh g −1 after 200 cycles at 2 A g −1 , showing an enhanced lithium storage ability. The superior lithium storage performance of the Si-Cu 3 Si-Cu microsphere@C composite can be ascribed to the improved electronic conductivity, enhanced mechanical stability, and better buffering against the large volume change in the repeated lithiation/delithiation processes.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 23
·11149-11157
·
IF 3.925
Haoran Pan,Yue Wang,Zhenjie Lu,Xinning Huang,Xingxing Chen
High-performance bifunctional electrocatalysts for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are arousing great interest aiming at efficient electrochemical splitting of water. Herein, we report a facile strategy to fabricate Co/Zn sulfide supported on Cu-foam (CoZn-S/Cu-F) as a free-standing electrode with high-performance for overall water splitting. In half-cell electrochemical systems, the overpotentials required to reach the current densities of ±10 mA cm−2 for the OER and HER are only 170 and 130 mV, respectively. After a long-term stability test running 20 000 cyclic voltammograms, the respective potential losses for the OER and HER are only 82 and 41 mV at ±50 mA cm−2. The constructed overall water splitting system driven by simulated solar energy also exhibits prominent performance with gas bubbles continuously generated at both electrodes. A cell voltage of only 1.58 V is required to reach the current densities of ±10 mA cm−2, surpassing the commercialized noble metal and state-of-the-art non-noble metal electrodes. The excellent performance for the overall water splitting is ascribed to the CoS nanoparticles covered with ZnS nanoflocs on the highly conductive Cu-foam, which allows close interfacial contact with the electrolyte, promotes mass and charge transfer, and facilitates desorption of the generated gas from the catalyst surface.
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高影响因子
Current Analytical Chemistry
·
2024
·Vol. 21
·期 7
·877-883
·
IF 1.7
Yong Zhang,Qianmin Cong,Chenxu Feng,Zhengyu Cai,Lizhai Pei
BackgroundCyanide is a toxic anion and may be discarded into the water environment, which is a serious threat to human beings and the environment. Hence, it is essential to explore a facile, sensitive method for cyanide detection. Polyaniline/Cu-vanadate nanobelts serve as electrode materials for sensitive cyanide determination.MethodsPolyaniline/Cu-vanadate nanobelts were obtained by a simple route using polyaniline, Cu-vanadate nanobelts. The polyaniline/Cu-vanadate nanobelts were measured via electron microscopy, diffraction, infrared spectrum, and electrochemical methods.ResultsAmorphous polyaniline nanoparticles with a particle size of about 100 nm were attached firmly to the surface of Cu-vanadate nanobelts. Electrochemical sensing properties for cyanide detection were analyzed using a cyclic voltammetry technique using the nanobelts-modified electrode. The cyclic voltammograms (CV) peaks centered at +0.64 V and +0.54 V were observed using the polyaniline/Cu-vanadate nanobelts in 0.1 M KCl solution with 2 mM cyanide. The proposed composite nanobelt-modified electrode possessed the detection range and detection limit of 0.001-2 mM and 0.22 μM, respectively.ConclusionPolyaniline greatly enhances the electro-catalytic performance of the Cu-vanadate nanobelt-modified electrode for cyanide detection.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Huilin Hou,Minghui Shang,Fengmei Gao,Lin Wang,Qiao Liu,Jinju Zheng,Zuobao Yang,Weiyou Yang
Development of novel hybrid photocatalysts with high efficiency and durability for photocatalytic hydrogen generation is highly desired but still remains a grand challenge currently. In the present work, we reported the exploration of ternary hybrid TiO2/CuO/Cu thoroughly mesoporous nanofibers via a foaming-assisted electrospinning technique. It is found that by adjusting the Cu contents in the solutions, the unitary (TiO2), binary (TiO2/CuO, TiO2/Cu), and ternary (TiO2/CuO/Cu) mesoporous products can be obtained, enabling the growth of TiO2/CuO/Cu ternary hybrids in a tailored manner. The photocatalytic behavior of the as-synthesized products as well as P25 was evaluated in terms of their hydrogen evolution efficiency for the photodecomposition water under Xe lamp irradiation. The results showed that the ternary TiO2/CuO/Cu thoroughly mesoporous nanofibers exhibit a robust stability and the most efficient photocatalytic H2 evolution with the highest release rate of ∼851.3 μmol g–1 h–1, which was profoundly enhanced for more than 3.5 times with respect to those of the pristine TiO2 counterparts and commercial P25, suggesting their promising applications in clean energy production.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Youqin Lu,Min Wang,Cunguang Yuan,Jinsheng Zhao,Jianfeng Yu
Cyclic voltammetry (CV) was used to fabricate carbon supported Pt-Cu alloy (Pt-Cu/C) for oxygen reduction reaction (ORR) at ambient temperature. A flowerlike structure of Pt-Cu nanoparticles were analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy was used to confirm the surface chemical composition and metallic state. And, electrochemical measurements such as CV, rotating disk electrode, rotating ring-disk and electrochemical impedance spectroscopy were applied to obtain the kinetic constants and the reaction mechanisms of the ORR. Compared with Pt/C, Cu/C, Pt-Cu/C exhibits the highest efficient catalytic activity for ORR, as evidenced by the highest current densities of the polarization curves, lowest onset oxidation potential and charge transfer impedance. The average electron transfer number and hydrogen peroxide calculated from RRDE are about 3.87 and 6.71%, respectively. These results show that the synthesized Pt-Cu/C has excellent electrocatalytic activity and the ORR is a four-electron dominant reduction pathway.
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Desalination and Water Treatment
·
2024
·
IF 1
Yongjun Sun,Aowen Chen,Wenquan Sun,Kinjal J. Shah,Huaili Zheng,Chengyu Zhu
In this work, carboxylated chitosan and acrylamide are used to synthesize a graft-modified natural polymer flocculant carboxylated chitosan-graft-acrylamide (CCSPAM) by UV-induced polymerization for copper and chromium removal. The effects of total monomer concentration, monomer mass ratio, pH value, photoinitiator concentration, and illumination time on the synthesis performance of CCSPAM were investigated regarding intrinsic viscosity (IV), grafting rate (GR), and grafting efficiency (GE). Various analytical techniques characterize the physicochemical characteristics of CCSPAM. Single factor experiments are used to investigate the effect of dosage, pH value, and reaction time on the chelation and capture of heavy metal ions by CCSPAM. The results show that the optimal IV, GR, and GE of CCSPAM achieved at total monomer concentration 30%, monomer mass ratio 1:4, pH 7.0, photoinitiator concentration 0.03%, and irradiation time 2 h are 1412.2 mL/g, 394.1%, and 84.1%, respectively. The experimental data of flocculation show that CCSPAM has a good total Cu and total Cr removal efficiency of 74.8% and 70.6% at dosage 2.0 mg/L, pH 6.0, and reaction time 2h, respectively. Fom the investigation, it is concluded that the grafted chitosan (CCSPAM) could be a be an effective and eco-friendly flocculant for removal of total Cu and total Cr ions from aqueous system.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 6
·2137-2143
·
IF 6.4
Jingshan Hou,Jianghua Wu,Zhiyu Qin,Yongzheng Fang,Leijun Shen,Xin Qiao,Langping Dong,Ganghua Zhang,Yufeng Liu,Guoying Zhao,Haijie Chen
Low-dimensional metal halides have attracted extensive attention because of their superior optoelectronic properties, high stability and structural diversity. In this work, we report a two-dimensional (2D) lead-free halide Cs2MnCl4:Cu+ as a new phosphor for white light-emitting diodes (LEDs). By doping copper(I) into manganese(II) sites, a strong green emission with a photoluminescence quantum yield (PLQY) of 70% was observed. The luminescence center was located at 530 nm and the optimal excitation wavelength was determined to be 310 nm, which suggests a large Stokes shift of 220 nm. Steady-state and transient fluorescence spectra show a decay time of 114.19 μs, indicating a self-trapped exciton (STE) emission mechanism which was further confirmed by temperature-dependent steady-state photoluminescence spectroscopy. This work suggests that manganese halides could be considered as a new family with high luminescence efficiency for optoelectronic applications.
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Matter
·
2025
·
IF 17.5
Bohan Li,Yongsheng Sun,Yuzhen Wang,Jiance Jin,Kai Han,Yan Xu,Zhiguo Xia
Highly transparent and large-area scintillator film is highly desirable for next-generation X-ray imaging and detection. Herein, we develop a rapid and in situ synthesis strategy to fabricate polymer scintillator film composed of (C 14 H 15 P) 4 Cu 4 I 4 glassy cluster gel (M1-GCG). The large-area M1-GCG film of 20 × 12 cm was obtained by in situ UV photopolymerization within 30 s, showing ∼90% transmittance in the broad spectral region of 400–1,000 nm, in which Cu(I) iodide clusters coordinated by phosphine ligands are generated as a glassy form in the polymer network structure and uniformly distributed under supramolecular interactions, as the polymer monomer is polymerized and cross-linked under ultraviolet light. We develop a brand-new chemical synthesis route toward polymer-based composite scintillator film, and the M1-GCG film with high transparency and scintillation properties, as well as high-resolution X-ray imaging ability, shows extraordinary potential for large-area medical imaging and industrial non-destructive detection.
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产品关联
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高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xinyu Wang,Tongtong Liu,Jingjing Wang,Bowen Xia,Yanfei Wang,Zhilin Li,Zhengping Zhang,Feng Wang
There is an urgent need for development of efficient and long-term stable catalytic electrodes for the hydrogen evolution reaction (HER) via alkaline water electrolysis (AWE) to enable economically competitive hydrogen energy production. In this work, a facile air pyrolysis treatment is used to fabricate RuO2 coatings on a Ti substrate (RuO2/TF), and the surface state of the active coatings during HER was investigated. It was observed that the original RuO2 surface transforms into a partially reduced form composed of mixed valence states (0/+4). Although the newly-formed surface has higher activity than RuO2, the Ru state and current efficiency fluctuate with the electrolysis conditions, and the HER activity will be limited by the final reduced state (i.e., Ru0). To stabilize and improve the active Ru surface, Cu, which experiences a polyvalence change around the HER potential, is doped into the RuO2 coating as an electron buffer. This modification with Cu electron buffers results in an active Ru surface that exhibits stable chemical states with excellent activity, rapid responsivity, and excellent stability under the fluctuating operation conditions of alkali electrolyzers. The AWE system with optimized RCO/TF as cathodes exhibits a lower voltage (2.07 V) and higher current efficiency (95.25%) at a current density of 1 A cm−2 than RuO2/TF (2.40 V, 80.97%). This study unveils the origin of the activity of Ru coatings for HER and proposes an approach to composition design for other multicomponent electrodes and electrochemical applications.
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