Nanomaterials
·
2023
·Vol. 13
·期 4
·624
·
IF 5.3
Nuo Chen,Kexin Sun,Huicong Liang,Bingyan Xu,Si Wu,Qi Zhang,Qiang Han,Jinghai Yang,Jihui Lang
A novel engineered carbon cloth (CC)-based self-cleaning membrane containing a Cu:TiO2and Ag coating has been created via hydrothermal and light deposition methods. The engineered membrane with chrysanthemum morphology has superhydrophilic and underwater superoleophilic performance. The cooperativity strategy of Cu doping and Ag coating to the TiO2is found to be critical for engineering the separation efficiency and self-cleaning skill of the CC-based membrane under visible light due to the modulated bandgap structure and surface plasmon resonance. The CC-based membrane has excellent oil–water separation performance when Cu is fixed at 2.5 wt% and the Ag coating reaches a certain amount of 0.003 mol/L AgNO3. The contact angle of underwater oil and the separation efficiency are 156° and 99.76%, respectively. Furthermore, the membrane has such an outstanding self-cleaning ability that the above performance can be nearly completely restored after 30 min of visible light irradiation, and the separation efficiency can still reach 99.65% after 100 cycles. Notably, the membrane with exceptional wear resistance and durability can work in various oil–water mixtures and harsh environments, indicating its potential as a new platform of the industrial-level available membrane in dealing with oily wastewater.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
PubMed
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
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Fang Cheng,Yongchang Liu,Zongqing Ma,Huijun Li,M. Shahriar Al Hossain
The un-doped Mg 11 B 2 and Cu-doped Mg 11 B 2 bulks using 11 B as a boron precursor were fabricated by solid-state reaction and sintered at different temperature in present work. By analyzing the sintering process, it was found that 11 B original powder is more reactive and can react with Mg severely even at low temperature before Mg melting, which leads to the formation of refined Mg 11 B 2 grains. Consequently, the critical current density of Mg 11 B 2 sample prepared in this work is higher than that of natural MgB 2 . Furthermore, it was found that proper Cu addition could obviously accelerate the reaction between Mg and 11 B and promote the formation of Mg 11 B 2 due to the appearance of Mg–Cu liquid at low sintering temperature before Mg melting. On the other hand, Cu addition also introduced more MgCu 2 impurity, leading to a relatively lower critical current density on the whole. Interestingly, the critical current density of the Cu doped sample sintered at 800 °C is surprisingly enhanced at the low field, compared with that of the corresponding un-doped one. This is due to the peritectic reaction which generated small-sized MgCu 2 occurred that at 800 °C, providing MgCu 2 pinning centers well-distributed in the MgB 2 matrix.
研究领域:
材料科学
·
超导体研究
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DOI
高影响因子
Environmental Progress & Sustainable Energy
·
2023
·
IF 2.8
Ping Gao,Xinshan Rong,Shixian Zhang,Ting Sun,Jun Liu,Xuchun Qiu,Xiangtong Zhou,Zhiren Wu,Jing Wei
Solar-driven reduction of nitrogen to ammonia is a promising green approach and is considered as a sustainable alternative to the Haber–Bosch process. Carbon nitride (g-C 3 N 4 ) is an ideal non-metallic semiconductor photocatalyst for photocatalytic N 2 reduction reaction (p-NRR). In this work, we designed a simple supramolecular self-assembly method to prepare copper-doped porous graphitic nitride (Cu@pg-C 3 N 4 ) photocatalysts. The synergistic semiconductor and metal interactions enabled the obtained Cu@pg-C 3 N 4 to achieve larger specific surface area, more efficient photogenerated carrier separation, and stronger photoreduction ability. The specific surface area of Cu@pg-C 3 N 4 increased from 5.69 to 75.76 μmol/L, exposing more active sites compared to bulk g-C 3 N 4 . The NH 4 + production rate of the obtained Cu@pg-C 3 N 4 was 150.47 μmol/L, which is 20 times higher than that of the bulk carbon nitride, exhibiting excellent N 2 photofixation ability. These findings highlight the significant progress that can be achieved by metal supramolecular network modification strategies in harnessing the potential of carbon nitride for photocatalytic reduction applications.
研究领域:
材料科学
·
环境科学
·
化学工程
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产品关联
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Daofu Wu,Xiaoqing Liu,Changqing Tian,Jinchen Zhou,Junan Lai,Hongmei Ran,Bo Gao,Miao Zhou,Qiang Huang,Xiaosheng Tang
Summary Lead halide perovskites are prospective candidates for CO 2 photoconversion. Herein, we report copper-doped lead-free Cs 2 AgSbCl 6 double perovskite microcrystals (MCs) for gas-solid phase photocatalytic CO 2 reduction. The 0.2Cu@Cs 2 AgSbCl 6 double perovskite MCs display unprecedented CO 2 photoreduction capability with CO and CH 4 yields of 412 and 128 μmol g −1 , respectively. The ultrafast transient absorption spectroscopy reveals the enhanced separation of photoexcited carriers in copper-doped Cs 2 AgSbCl 6 MCs. The active sites and reaction intermediates on the surface of the doped Cs 2 AgSbCl 6 are dynamically monitored and precisely unraveled based on the in-situ Fourier transform infrared spectroscopy investigation. In combination with density functional theory calculations, it is revealed that the copper-doped Cs 2 AgSbCl 6 MCs facilitate sturdy CO 2 adsorption and activation and strikingly enhance the photocatalytic performance. This work offers an in-depth interpretation of the photocatalytic mechanism of Cs 2 AgSbCl 6 doped with copper, which may provide guidance for future design of high-performance photocatalysts for solar fuel production.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Junfeng Qin,Qinghui Shen,Cuicui Du,Min Hong,Yixin Yang,Xiaohua Zhang,Jinhua Chen
Heteroatom doping and vacancy engineering play vital roles in designing a high-activity electrocatalyst . Herein, we proposed a novel enriched Se vacancies engineering of the promising ruthenium chalcogenide of RuSe 2 induced by low-valence Cu doping for promoting hydrogen evolution reaction (HER) electrocatalysis in alkaline media. The Cu-doped RuSe 2 with enriched Se vacancies supported on graphitized carbon (Cu-RuSe 2 @C) was synthesized by a simple one-step selenization of bimetallic MOF precursor of Ru/Cu-BTC (1,3,5-benzenetricarboxylic acid) polyhedra. Compared to the Cu(Ⅱ)-dominant doped RuSe 2 (Cu Ⅱ/Ⅰ -RuSe 2 @C) with deficient Se vacancies, the proposed Cu(Ⅰ)-dominant doped RuSe 2 (Cu Ⅰ/Ⅱ -RuSe 2 @C) with enriched Se vacancies exhibited significantly improved electrocatalytic activity, which was potentially derived from the created electron-deficient Ru δ+ and Se ν− sites induced by low-valence Cu doping. Specifically, Cu Ⅰ/Ⅱ -RuSe 2 @C needed only 40 mV overpotential to drive a HER current density of 10 mA cm −2 , comparable to commercial Pt/C (38 mV) and much lower than those of Cu Ⅱ/Ⅰ -RuSe 2 @C (93 mV) and RuSe 2 @C (362 mV). Furthermore, an alkaline Zn-H 2 O fuel cell with a Cu Ⅰ/Ⅱ -RuSe 2 @C cathode was integrated to demonstrate its potential applications, which delivered a maximum power density of 15.1 mW cm −2 and specific capacitance of 660 mAh g −1 with good stability. Two series-connected alkaline Zn-H 2 O cells acted as a chemical energy converter for simultaneous electricity generation and hydrogen coproduction by driving the coupled water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2025
·
IF 3
Wang Haozhe,Bai Xueli,Li Jiamei,Li Hao,Zhang Xiaoping,Wang Feng
Platinum is a crucial anode catalyst in methanol oxidation reactions (MOR) due to its exceptional electrochemical performance, which has led to its widespread application. However, to enhance its catalytic activity and stability, platinum is typically supported on carrier materials, such as carbon-based substrates. Current commercial platinum-carbon catalysts exhibit limited activity, low utilization efficiency of metallic platinum, and a tendency to bind with intermediate species, leading to a decline in catalytic performance. To address these challenges, this study proposes the utilization of copper-doped carbon for the development of a composite support (Cu 2 C 7 ). Compared with the pure carbon supported platinum catalyst (Pt@Cu 0 C 7 ), the electrochemical activity of Cu 2 C 7 supported platinum catalyst (Pt@Cu 2 C 7 ) was significantly enhanced, as evidenced by a current density of 412 mA/cm 2 and an onset potential of −0.8 V. In chronoamperometry experiments, after 2 h of electrochemical testing, the activity of Pt@Cu 2 C 7 decreased by only 4.24%, whereas Pt@Cu 0 C 7 experienced a significant reduction of 55% in activity. The incorporation of copper is hypothesized to provide additional active sites for the deposition of metallic platinum on the carrier, thereby enhancing the platinum loading capacity. According to inductively coupled plasma (ICP) analysis, when the copper-to-carbon ratio is 2:7, the platinum loading amount increases by 25.78%. Furthermore, some platinum forms an alloy with the copper embedded in the carbon, a phenomenon corroborated by X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. The literature suggests that the formation of such alloys can significantly improve the catalyst’s resistance to poisoning. The incorporation of copper not only enhances the platinum loading capacity but may also induce a synergistic effect among the active platinum components, thereby further improving catalytic performance. In summary, the findings of this study offer critical theoretical insights and practical guidelines for the design of high-performance MOR electrocatalysts, laying a robust foundation for future advancements in catalyst development.
研究领域:
化学
·
材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Tianshun Yao,Huan Zhang,Cai Qi,Jun Ma,Zihao Zhou,Quan Sun,Li Song,Yachao Jin,Mingdao Zhang
The exponential growth of electric vehicles (EVs) will lead to the large-scale retirement of lithium iron phosphate (LFP) batteries in the future. This work proposes an environmentally friendly solid-phase strategy for regenerating waste LFP cathode materials. The regeneration mechanism is also investigated through characterizations. The method involves lithium supplementation, crystal structure repair and Cu doping. Glucose is used as a reducing agent to reduce a large amount of Fe 3+ in waste LFP to Fe 2+ , while the addition of Li + is used to fill the lithium vacancy in waste LFP. Notably, Cu doping increases the vibrational density and conductivity of the regenerated material and expands the ion diffusion channel, which significantly enhances the electrochemical performance of the regenerated LFP cathode. Moreover, the specific capacity of regenerated LFP (Cu@R-LFP) at 0.05C is 160.15 mAh/g, about 97.65 % of that of new LFP (N-LFP). The capacity retention rate of Cu@R-LFP can be as high as 81.19 % even after 1,000 cycles at 1C rate. The method proposed in this study provides a simple and scalable strategy for recycling waste LFP cathode materials.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
·
2024
·
IF 1.9
Wanting Gui,Lu Yao,Xunsheng Zhou,Qi Wu,Chao Li,Shi Zhang,Yunfeng Zhan,Cai Lin Wang
Ag-based metal halide scintillators have recently attracted significant interest for X-ray imaging due to their high light yield and ultra-fast decay lifetime. These properties are advantageous for thermal neutron detection, yet their application in this area have not been thoroughly explored. In this article, we investigate the properties of Cu-doped Cs
2
AgI
3
metal halide scintillators for X-ray imaging and thermal neutron detection. A simple synthesis process was employed to produce Cu-doped Cs
2
AgI
3
scintillators. The as-prepared Cu-doped Cs
2
AgI
3
exhibited intense green emission with a photoluminescence quantum yield (PLQY) of 55 ± 2.7%. Cu-doped Cs
2
AgI
3
/PVDF plastic scintillation screen has been prepared and achieved a resolution of 5 lp/mm under X-ray radiation. A composite consisting of
6
LiF, Cu-doped Cs
2
AgI
3
, and Poly (methyl methacrylate) (PMMA) was utilized for thermal neutron detection, achieving a light yield of about 12,526±9 photons/thermal neutron, which is almost twice that of a commercial
6
Li-glass (GS20) scintillator (7000 photons/thermal neutron). Effective neutron-gamma pulse discrimination was achieved using a network dynamics digital filter, effectively separating thermal neutron events from gamma events.
研究领域:
材料科学
·
核技术应用
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 34
·1-9
·
IF 2.8
Gao Dawei,Ma Juncheng,Zhang Jiafen,Shi Qingang,Xiong Zhe,Zhang Xing,Tang Bin
The occurrence of "dark holes" is a common phenomenon in TiO 2 -based ceramics, resulting from the reduction of Ti 4+ under high-temperature and low-oxygen partial pressure sintering conditions. To achieve low dielectric loss, Ca 0.61 Nd 0.26 Ti 1- x Cu x O 3 ceramics were designed and prepared in this work. The results indicate that moderate doping of CuO not only enhances insulation resistivity and Q × f value but also reduces the positive τ f value. The Ca 0.61 Nd 0.26 Ti 0.98 Cu 0.02 O 3 sample exhibited the highest Q × f value of 16,895 GHz, contributing to the miniaturization and insertion loss of microwave devices.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Peiwen Ju,Hui Zhong,Zhiguo He,Weiqi Xie
The catalytic production of aromatic azo compounds by aniline’s oxidative coupling process is significant in organic synthesis. However, the catalysts used in this method generally exhibit low selectivity for the desired products and need costly preparation methods. In this study, for the first time, we proposed a species regulation strategy to synthesize the Rb-doped Cu/CeO2 nanorod catalyst, which showed high conversion (98%) and selectivity (95%) toward oxidative coupling of aniline to azoxybenzene using H2O2 as the oxidant. Aniline radical ion trapping experiments demonstrated that the oxidative coupling of aniline to azoxybenzene follows a nitrosobenzene intermediate mechanism. Characterization studies revealed that the addition of Rb not only enhances the interaction between Cu species and CeO2 but also increases oxygen vacancy content. DFT calculations indicate that the Cu–Ce and Rb–Ce interfaces are the main active sites, offering excellent catalytic performance. The reusability test for five cycles shows good stability of a Rb–Cu/CeO2 nanorod catalyst. The study provides a promising species regulation strategy for Rb-promoted nanocatalysts with ultrahigh selectivity, expanding their applicability in oxidative coupling and related reactions.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yang Liu,Hailong Feng,Weiyi Li,Xueping Wang,Guoxiang Huang,Longxia Wang,Xingqiu Li,Yuxing Xie,Chenglu Liang
Catalysts in-situ reconstructed from transition metal sulfides for oxygen evolution reaction (OER) have been regarded as potential alternatives for the noble metal catalysts . Intriguingly, it was found that the self-optimized SO 4 2− @Cu doped Co(OH) 2 catalyst was reconstructed from bimetallic sulfide of CuCo 2 S 4 . During the OER process, the copper was partially leached and meantime doped into the in-situ generated Co(OH) 2 with SO 4 2− adsorption, while only oxides were discovered in counterparts of mono-metal sulfides. As a result, the SO 4 2− @Cu doped Co(OH) 2 catalyst exhibited superior OER performances, with low overpotentials of 211/272 mV to achieve the current densities of 10/100 mA cm −2 , exceeding the counterparts reconstructed from mono-metal sulfides. Experimental and theoretical results suggested that the in situ generated Cu doped Co(OH) 2 possessed thin and loosely layered structure with expanded lattice spacing (lattice spacing expanded from 0.28 nm to 0.46 nm) due to the SO 4 2− adsorption, making the intermediates more accessible to the active centers. In addition, the catalyst surface changed from hydrophobicity to super hydrophilicity , which greatly accelerated the mass transfer. This work indicated that the in-situ reconstruction process was greatly influenced by the interactions between metal sites and sulfide species, directly influencing the OER performances of the reconstructed catalysts.
研究领域:
材料科学
·
电化学
✓ 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）