CRYSTENGCOMM
·
2022
·Vol. 24
·期 36
·6400-6407
·
IF 3.756
Anzhou Yang,Qiuzi Huang,Ziqi Wei,Zehan Yu,Meifeng Cui,Wu Lei,Yawen Tang,Xiaoyu Qiu
Designing cost-effective, highly active, and durable noble-metal-free electrocatalysts as alternative electrode materials for the methanol oxidation reaction (MOR) is of significant importance for practical applications. Herein, we report a facile one-pot synthetic route to construct Cu@Ni core–satellite nanoassemblies (CS-NAs) with the assistance of eco-friendly L-lysine, which involves the spontaneous process of preferential formation of the Cu core followed by self-assembly growth of Ni satellites. The selection of the Cu core is beneficial for enhancing the charge transfer and tuning the electronic structure of Ni satellites, as well as serving as a self-skeleton to enhance the structural stability for catalysis. Meanwhile, the tiny Ni satellites could be fully exposed, which not only produce a larger number of valid active sites, but also provide a short electron and ion transport distance. As a result, the Cu@Ni CS-NAs are qualified as superior and durable electrocatalysts for the MOR, affording 29.6 mA cm−2 at 1.6 V with long-term chronoamperometric stability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Fang Zhou,Yan Zhu,Longlai Yang,De-Quan Yang,Edward Sacher
Aqueous dispersions of AgCu nanoparticles (NPs), with enhanced antibacterial efficacy, have been prepared through the catalyzed reduction of Cu ions by PVP/PVA-stabilized Ag nanoparticles at 85 °C. The effects of Cu concentration and heating time on NP morphology and antibacterial efficacy were investigated, using TEM, UV-Vis and FTIR spectroscopies , and antibacterial evaluations. The enhanced antibacterial performance of these NPs was correlated with Ag ion release. We propose a simple model of AgCu NP formation, and an enhanced antibacterial efficacy mechanism involving Ag ion release, in which AgCu NPs formation plays a role to control of Ag ion release.
研究领域:
材料科学
·
微生物学
·
纳米医学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mengting Liu,Fu Yang,Hongyao Zhao,Xiu Zhong,Ruiting Ni,Kwame Nana Opoku,Zhenxiao Wang,Yangping Zhang,Yanyun Wang,Feng Zeng,Yinlong Zhu,Weidong Shi
In electrochemical nitrate reduction reaction (NITRR), the generation of active hydrogen (*H) and its poor utilization in conversion of various nitrate intermediates often cause mismatched kinetics, resulting in low ammonia yield rate (YR NH3 ) and Faraday efficiency (FE NH3 ). Herein, we construct a spatially-confined Cu/Fe 2 O 3 heterointerfaces within porous carbon fiber, featuring oxygen vacancy-rich iron oxide nanoparticles (∼14.7 nm) interface-coupled well-dispersed Cu nanocrystals. The interfacial metallic copper sites with optimized interfacial electron transfer accelerate the consumption of NO 2 – through supplying the most abundant active *H to equilibrate NITRR kinetics. The easy desorption of generated NH 3 from active sites facilitates the accelerated reaction cycles by rapidly exposing the spent active sites. Correspondingly, this catalyst achieves nearly 100 % nitrate conversion, with a YR NH3 of 81.3 mg h −1 mg cat -1 , FE NH3 of 98.11 %, and 100 % NH 3 selectivity without any nitrite accumulation, outperforming most state-to-art catalysts as reported. Impressively, when nitrite acts as reactant, ammonia synthesis through nitrite reduction reaches YR NH3 of 99 mg h −1 mg cat -1 and FE NH3 of 99.44 % outperforming all the same series reported. Moreover, active *H quenching and isotope labeling experiments uncover the generation of the most abundant active *H species and their high utilization among the reported results. Density function theory (DFT) calculations further indicate the interfacial Cu/Fe 2 O 3 regulates the d-band center of the catalyst, optimizing the adsorption of nitrate and further lowering the reaction energy barrier of the decisive step (*NO→*NOH).
研究领域:
化学工程
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·Vol. 49
·期 24
·10338-10356
·
IF 2.5
Fan Bai,Yanjiao Gao,Yongbo Xiao,Jingyi Yang,Jiaxin Chen,Jing Xiao
In recent years, advanced oxidation based on periodate (PI) has become a research focus for disposal of recalcitrant organics from water due to its efficient oxidizing ability. This study systematically investigated the degradation of reactive black 5 (RB5) by the Cu(II)-activated sodium periodate (NaIO4, SPI) system. The optimal reaction conditions were determined via Box–Behnken response surface methodology as [Cu(II)] = 1.013 ± 0.021 g L−1, [SPI] = 45 ± 2 μM, and pH = 5.7 ± 0.3, achieving a RB5 removal rate of 91.98% (R2 = 0.9901, prediction error <1%). The free radical quenching experiment confirmed that the dominant ROS in the system were ˙OH, 1O2, and IO3˙, and their contribution was IO3˙ > 1O2 > ˙OH. The coexistence anion experiments showed that Cl− (0.1–5.0 mM) and SO42− (0.1–5.0 mM) had almost no effect on the RB5 degradation efficiency, with inhibition rates lower than 1.99% and 3.58%, respectively, while CO32− (1.0 mM) and HCO3− (1.0 mM) led to a decrease of 20.8% and 14.17% in the RB5 degradation rate. In the presence of HA, the degradation efficiency of RB5 was maintained at 89.88–92.66%. The system maintained a removal rate of 73.33–87.66% for RB5 in the simulated actual water bodies (tap water/river water/brewery wastewater). Energy-assisted experiments showed that the activation energy of the reaction was significantly reduced and the kobs values were increased by 10.3 times when the temperature was increased to 40 °C, and the reaction time could be shortened to 2 min (removal rate >98%) after ultraviolet (365 nm, 20 W) coupling. In summary, this study is expected to support the related PI-based advanced oxidation process in stubborn pollutant treatment.
研究领域:
环境科学
·
水污染处理
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Jie Song,Jun Li,Xiangren Bai,Liang Kang,Liying Ma,Naiqin Zhao,Shuilin Wu,Yuan Xue,Jiajun Li,Xiaojian Ji,Junwei Sha
Low photothermal conversion efficiency restricts the antibacterial application of photothermal materials. In this work, two-dimensional carbon nanosheets (2D C) were prepared and decorated with Cu nanoparticles (2D C/Cu) by using a simple soluble salt template method combined with ultrasonic exfoliation. The photothermal conversion efficiency of 2D C/Cu system can be optimized by changing the content of Cu nanoparticles, where the 2D C/Cu2 showed the best photothermal conversion efficiency ( η ) of 65.05 % under 808 nm near-infrared light irradiation. In addition, the photothermal performance can affect the release behavior of Cu ions. This superior photothermal property combined with released Cu ions can endow this 2D hybrid material with highly efficient antibacterial efficacy of 99.97 % ± 0.01 %, 99.96 % ± 0.01 %, 99.97 % ± 0.01 % against Escherichia coli , Staphylococcus aureus, and methicillin-resistant Staphylococcus aureus, respectively, because of the synergetic effect of photothermy and ion release. In addition, this 2D hybrid system exhibited good cytocompatibility. Hence, this study provides a novel strategy to enhance the photothermal performance of 2D materials and thus will be beneficial for development of antibiotics-free antibacterial materials with safe and highly efficient bactericidal activity.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jie Chen,Wenhao Xu,Xingjin Li,Libo Sun,Zihan Zhong,Zitao Zhang,Yun Tang
The optical properties of cost-effective Ag-Cu bimetallic nanocrystals, with synergistically enhanced catalytic and biological activities, are limited within ultraviolet–visible region due to lack of morphology control. In order to overcome this constraint, two-dimensional (2D) Ag-Cu bimetallic heterostructures were designed and synthesized by a seed-mediated colloidal growth method. The conformal Cu domain was epitaxially deposited on Ag nanoplates with different spatial configuration under retention of their 2D shape. Both of the 2D Ag-Cu core@shell and Janus structures display tunable localized surface plasmon resonance from visible to near infrared regions. The results of catalytic reduction of 4-nitrophenol show that the 2D Ag-Cu core@shell structure has better synergistic catalytic performance than Janus structure and Ag plates. In addition to surface-related synergistically enhanced bactericidal performance, their antibacterial effect can also be significantly enhanced by near infrared light irradiation. These results indicate that 2D Ag-Cu heterostructures can benefit from both synergistically improved surface activity and great optical responsive characteristics.
研究领域:
材料科学
·
纳米生物学
·
光学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Limin Liu,Yong Wang,Xiaoliang Zhou,Yixuan Yang,Chao Ma,Yuan Li,Chen Wang,Xiaohong Zhao,Bin Li
A cermet fuel electrode Cu/Ce 0.6 Mn 0.3 Fe 0.1 O 2-δ (Cu/CMF) is proposed for a reversible solid oxide electrochemical cell (SOC) with CO/CO 2 as the shuttle. Cu is inert for the carbon deposition and CMF is electrochemically active for CO oxidation and CO 2 reduction. The electrode polarization resistances in CO at 700, 750 and 800 °C are 0.328, 0.207 and 0.155 Ω cm 2 , respectively, presenting high electrochemical activity towards CO oxidation. The maximal power densities can reach up to 303.3, 482.2 and 691.9 mW/cm 2 at 700, 750 and 800 °C, respectively. When the reversible SOCs are operated in solid oxide electrolysis cell mode, the polarization resistance of the electrolysis cell for pure CO 2 reduction at 800 °C has the minimal value of 0.126 Ω cm 2 at 1.8 V. At 2.0 V, the current densities can reach up to 0.584 1.219 and 2.204 A/cm 2 at 700, 750 and 800 °C, respectively. The durability of the cell in CO for as long as 200 h indicates the electrode has remarkable stability. And the short-term stability characteristics for CO 2 electrolysis at different voltages illustrate that the cell performs well below 2.0 V. The harsh reducing environment at 2.0 V may be detrimental to the Cu/CMF electrode.
研究领域:
电化学
·
能源材料
·
功能陶瓷
·
催化化学
·
可再生能源
·
电化学能量转换
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2022
·Vol. 12
·期 1
·1-10
·
IF 4.996
Tan Meina,Qin Yang,Wang Yiping,Zhang Fazhi,Lei Xiaodong
We propose a new Cu–Al dual-ion battery that aqueous solution composed of LiCl, CuCl and AlCl 3 (LiCuAl) is used as the electrolyte, CuS is used as the cathode of aqueous aluminum ion battery for the first time and copper foil is used as the anode. The assembled Cu–Al dual-ion battery yields a reversible capacity of 538 mA h/g at 200 mA/g, and exhibits longterm cycling stability of over 200 cycles with 88.6% capacity retention at 1000 mA/g. Above excellent performance is inseparable from the three components of LiCuAl electrolyte and electrode materials. The Al-storage mechanism of CuS is proposed that the S–S bond in CuS lattice interacts with aluminum ions during the aluminum storage process. In addition, the charging and discharging process does not cause irreversible damage to the S–S bond, thus Cu–Al dual-ion battery with CuS as cathode shows great cycle stability.
研究领域:
电化学
·
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
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.
研究领域:
材料科学
·
光电技术
·
放射学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Liman Chen,Yang Yang,Guixiang Wang,Yanli Wang,Simon Ochieng Adede,Meng Zhang,Caishan Jiao,Di Wang,Dashuai Yan,Yibo Liu,Duanjie Chen,Weibing Wang
A new three-layered film was fabricated on magnesium (Mg) alloy via electroplating to guard against corrosion in a chloride aqueous environment, which consisted of an underlying double-layered zinc/copper (Zn/Cu) and a top aluminum–zirconium (Al–Zr) layer. The Zn/Cu underlayers not only impeded the galvanic corrosion between the Al–Zr coating and Mg alloy but also improved the adhesive ability between the substrate and the upper Al–Zr layer. Herein, we discussed the nucleus sizes of Al–Zr coatings at the stage of nucleation carried out with different contents of ZrCl4 in AlCl3–1-butyl-3-methylimidazolium chloride ionic liquid. The sandwichlike three-layered Zn/Cu/Al–Zr coatings were systematically investigated by surface morphology, phase structure, hardness, anticorrosion performances, and first-principles calculations. The corrosion current density declined from 1.461 × 10–3 A·cm–2 of bare Mg to 4.140 × 10–7 A·cm–2 of the Zn/Cu/Al–Zr3 sample. Neutral salt spray testing demonstrated that the Zn/Cu/Al–Zr3 sample showed no evident signs of corrosion after 6 days of exposure. The enhancement of the corrosion protection property was related to the fact that the application of the Cu layer changed the corrosion direction from initial longitudinal corrosion to extended lateral corrosion and the top Al–Zr coating hindered the transmission of aggressive ions. In addition, upon increasing the Zr content in the alloy films, the Fermi energy reduced initially and then increased. The Al–Zr3 alloy with 8.3 atom % Zr showed the lowest Fermi energy (−3.0823 eV), which exhibited the most efficient corrosion protection. These results showed that the prepared three-layered coating provided reliable corrosion protection to Mg alloy and may thus promote its practical applications.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Hongping He,Mei Sun,Deli Wu,Guanglan Di,Xunchang Fei
Heterogeneous Fenton dominated by ·OH is limited in its application, as pre-acidification is required to maximize the generation amount and redox potential of ·OH. It is thus featured to consume resources and generate pollutants. In this study, both CuS/H 2 O 2 and Cu 2 S/H 2 O 2 are found to show better performances under close-to-neutral condition (pH 5.0 to 9.0) than acidic condition (pH 3.0) when degrading a model contaminant, sulfamethazine (SMZ), because ·OH does not play a major role in both systems. The Cu valence-dependent catalytic mechanisms are responsible for the varied kinetics between CuS/H 2 O 2 and Cu 2 S/H 2 O 2 . In CuS/H 2 O 2 , Cu(III) and 1 O 2 contribute to the SMZ degradation, and their contributions are pH-dependent. In Cu 2 S/H 2 O 2 , Cu(III) is responsible for the degradation regardless of the pH. Both systems with optimal performances under neutral condition are advantageous as pre-acidification can be avoided. In addition, air sparging induces additional 16% SMZ degradation in Cu 2 S/H 2 O 2 under acidic condition, because the sparged O 2 reacts with dissolved Cu(I). The more O 2 reacts with the dissolved Cu(I), the less generated Cu(III) is ineffectively depleted. Air sparging is readily applicable to different operations, thus its combination with Cu 2 S/H 2 O 2 potentially benefits the development of environmentally-friendly treatment process for industrial wastewater .
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 30
·41504-41515
·
IF 4.223
Zhao Kang-He,Ma Yu-Long,Lin Feng,Ge Shao-Ying,Zhu Li
A composite Mn-Cu-Ce tri-metal oxide supported on γ-Al 2 O 3 (Mn-Cu-Ce/Al 2 O 3 ) catalyst was prepared by an impregnation-calcination method and investigated in the catalytic ozonation treatment of real coal chemical wastewater (CCW). The catalyst was characterized by XRD, SEM, TEM, XRF, BET, and XPS techniques. The results showed that Mn, Cu, and Ce metal oxides were evenly distributed on the Al 2 O 3 surface and the catalyst maintained a large surface area and a high pore volume compared with the pristine Al 2 O 3 . The synergy between Mn, Cu, and Ce oxides greatly enriched the catalytic active sites and enhanced the ozonation performance. The catalytic ozonation process with Mn-Cu-Ce/Al 2 O 3 increased the removal rate of total organic carbon (TOC) by 31.6% compared with ozonation alone. The ketones, aromatic compounds, phenols, and nitrogen-containing heterocyclic compounds in CCW have been effectively degraded and mineralized by Mn-Cu-Ce/Al 2 O 3 catalytic ozonation process, and its biodegradability has also been significantly improved. The experimental results of ∙OH scavengers revealed that the mechanism of Mn-Cu-Ce/Al 2 O 3 catalytic ozonation was to promote the generation of ∙OH radicals. The catalytic activity of Mn-Cu-Ce/Al 2 O 3 was only a slight decrease in six consecutive catalytic ozonation treatments, showing good stability. Therefore, Mn-Cu-Ce/Al 2 O 3 can be used as a candidate catalyst for the advanced treatment of refractory organic wastewaters upon catalytic ozonation.
研究领域:
环境工程
·
化学工程
·
水处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）