RSC Advances
·
2016
·Vol. 6
·期 99
·97129-97136
·
IF 3.289
Wen-Bei Yu,Zhi-Yi Hu,Ming Yi,Shao-Zhuan Huang,Dai-Song Chen,Jun Jin,Yu Li,G. Van Tendeloo,Bao-Lian Su
Transition metal oxides with exposed highly active facets have become of increasing interest as anode materials for lithium ion batteries, because more dangling atoms exposed at the active surface facilitate the reaction between the transition metal oxides and lithium. In this work, we probed the electrochemical behavior of hollow Cu2O microspheres with {111} and {110} active facets on the polyhedron surface as anodes for lithium storage. Compared to commercial Cu2O nanoparticles, hollow Cu2O microspheres with {111} and {110} active facets show a rising specific capacity at 30 cycles which then decreases after 110 cycles during the cycling process. Via advanced electron microscopy characterization, we reveal that this phenomenon can be attributed to the highly active {111} and {110} facets with dangling “Cu” atoms facilitating the conversion reaction of Cu2O and Li, where part of the Cu2O is oxidized to CuO during the charging process. However, as the reaction proceeds, more and more formed Cu nanoparticles cannot be converted to Cu2O or CuO. This leads to a decrease of the specific capacity. We believe that our study here sheds some light on the progress of the electrochemical behavior of transition metal oxides with respect to their increased specific capacity and the subsequent decrease via a conversion reaction mechanism. These results will be helpful to optimize the design of transition metal oxide micro/nanostructures for high performance lithium storage.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Shaoxiong Qin,Zixiu Li,Yang Zhang,Jiaqi Pan,Jun Cao,Chaorong Li,Jingjing Wang
The sensitivity and stability of SERS substrates are critical in surface-enhanced Raman scattering (SERS) spectral applications. The present study describes the synthesis of Cu 2 O nanoparticles using a facile chemical method. It was observed that both glucose and NaBH 4 , employed as reducing agents, exerted significant influence on the particle size. Notably, NaBH 4 exhibited enhanced efficacy in producing nanoscale particles. Furthermore, the structural characteristics of the sample were significantly influenced by the concentration of the reducing agent NaBH 4 ; an excessive concentration resulted in the emergence of metal copper. The Cu 2 O nanoparticles, obtained through a suitable reduction process using NaBH 4 , exhibited significant SERS activity, indicating a strong chemical interaction between Cu 2 O and rhodamine 6G (R6G) molecules. The N-doped Cu 2 O nanoparticles with varying proportions were synthesized. Raman spectra analysis revealed that the 2%N–Cu 2 O nanoparticles exhibited the most significant enhancement effect. These findings suggest that doping represents an effective approach to enhance the SERS activity of semiconductor substrates. In addition, in-situ reduction reaction was employed to synthesize Cu 2 O/Ag composite nanoparticles, which exhibited outstanding SERS activity and enabled the detection of 10 −9 M R6G. The observed enhancement is mainly attributed to the synergistic effects arising from the electromagnetic enhancement provided by Ag nanoparticles and the chemical enhancement offered by Cu 2 O. This research provides a simple and cost-effective method for preparing Cu 2 O-based SERS substrates with excellent performance, offering valuable insights and approaches for enhancing SERS performance in the future.
研究领域:
材料科学
·
光谱学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2019
·Vol. 19
·期 13
·2926
·
IF 3.031
Chenlin Lu,Zhipeng Li,Liwei Ren,Nan Su,Diannan Lu,Zheng Liu
The development of a sensitive, quick-responding, and robust glucose sensor is consistently pursued for use in numerous applications. Here, we propose a new method for preparing a Cu2O electrode for the electrochemical detection of glucose concentration. The Cu2O glucose electrode was prepared by in situ electrical oxidation in an alkaline solution, in which Cu2O nanoparticles were deposited on the electrode surface to form a thin film, followed by the growth of Cu(OH)2nanorods or nanotubes. The morphology and electrocatalytic activity of a Cu2O glucose electrode can be tuned by the current density, reaction time, and NaOH concentration. The results from XRD, SEM, and a Raman spectrum show that the electrode surface was coated with cubic Cu2O nanoparticles with diameters ranging from 50 to 150 nm. The electrode exhibited a detection limit of 0.0275 mM, a peak sensitivity of 2524.9 μA·cm−2·mM−1, and a linear response range from 0.1 to 1 mM. The presence of high concentrations of ascorbic acid, uric acid, dopamine and lactose appeared to have no effects on the detection of glucose, indicating a high specificity and robustness of this electrode.Keywords:glucose detection;glucose sensor;electrochemical analysis;Cu2O nanoparticles;electrochemical deposition
研究领域:
电化学
·
生物传感器
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
X. Li,Z. Wang,J. Zhang,K. Dai,K. Fan,G. Dawson
The solar driven reduction of carbon dioxide (CO 2 ) to high value-added carbon based fuel is a promising solution to mitidate climate and energy problems, however, improving the adsorption and conversion efficiency of CO 2 in the photoreduction process still faces severe challenges. In this work, Cd 0·7 Zn 0·3 Se solid solution was prepared by cation exchange: selenium (Se) vacancies are produced during ion exchange, which promotes the unsaturated coordination of the surrounding metal atoms. The adsorption of diethylenetriamine (DETA) on the surface limits the growth of Cd x Zn 1- x Se crystallites , resulting in insufficient coordination of the surface atoms, which then become active adsorption sites. Furthermore, a heterojunction was formed with Cu 2 O@Cu to accelerate the separation and transfer of photo-induced carriers of Cd 0·7 Zn 0·3 Se, and the optimized Cd 0·7 Zn 0·3 Se/Cu 2 O@Cu (CZS/CC) step-scheme heterojunction exhibited a CO release activity of 50.5 μmol g −1 h −1 , which is 3.8 and 10.7 times higher than that of Cd 0·7 Zn 0·3 Se and Cu 2 O@Cu, respectively. This work is expected to open up new insight for the regulation of nanostructures and the design of selective catalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Huijuan Chen,Fangrui Gao,Wenbin Ren,Lulu Du,Kaifeng Xue,Pinhua Zhang,Changmin Shi,Li Lv,Guangliang Cui
Ultra-sensitive hydrogen sulfide (H 2 S) detection technology at low temperatures provides critical support for the application of one-time alert systems under extreme conditions, ensuring reliable monitoring of H 2 S in low-temperature environments and enhancing safety and practicability. In this study, we developed a novel low-temperature H 2 S sensor based on Cu/Cu 2 O nanoarrays, prepared through a combination of 2D electrodeposition in situ assembly and the hydrothermal method. The heterointerface between Cu nanowires and Cu 2 O nanocubes presents a high barrier, which can be modulated to zero through the formation of continuous Cu x S conductive channels via the vulcanization reaction, thereby achieving excellent sensitivity and selectivity towards H 2 S at low temperatures. At freezing temperatures and low H 2 S concentrations (≤20 ppm), the sensors show ideal recovery and reasonable sensitivity (R=150 to 10 ppm H 2 S at 0 °C). However, the response significantly increases (R=5624 at 10 ppm H 2 S at 50 °C) and recovery is lost under reversed conditions. First-principles calculations have confirmed that the enhanced H 2 S adsorption at the heterointerface is the primary reason for the robust response observed at 0 °C. Experimental results demonstrate that the Cu/Cu 2 O nanoarrays were capable of rapid detection of H 2 S at low temperatures through modulation of heterointerface barriers.
研究领域:
材料科学
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化学传感器
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Xiaoli Zhuang,Chao Han,Jingrui Zhang,Zhaohu Sang,Wei Meng
Metal/metal oxide heterojunctions with diverse combination is significantly desirable in constructing excellent electrochemical platform in the sensing field. In this paper, a ternary composite of Cu/Cu 2 O@C, in which a Cu/Cu 2 O heterojunctions with “head to head” combination fashion uniformly disperse in the octahedral carbon framework, is in situ generated by treating a copper-metal-organic framework (Cu-MOF) under a relatively mild temperature. The Cu/Cu 2 O@C composite is used as electrode material to modify glassy carbon electrode (GCE) to construct a glucose sensor, which shows excellent sensing behaviors with high detection sensitivities of 621.12 μA mM −1 cm −2 and 372.67 μA mM −1 cm −2 in the glucose concentration of 0.001–1.7 mM and 1.7–9.7 mM, respectively. Meanwhile, the Cu/Cu 2 O@C/GCE also exhibits outstanding selectivity for glucose as well as good stability, repeatability and practicability in the test process. The good sensing performances could attribute to the unique characteristics of Cu/Cu 2 O@C: (i) the highly dispersed Cu/Cu 2 O nanoparticles originating from metal-organic framework provide abundant catalytic-sites for the glucose oxidation ; (ii) the “head to head” combination fashion for Cu/Cu 2 O heterojunctions make Cu and Cu 2 O fully participate in the electrocatalytic oxidation for glucose. (iii) the in situ generated carbon framework promotes the charge transfer in the electrocatalytic process.
研究领域:
材料科学
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分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Jianhao Li,Zhicheng Hu,Shuhuan Han,Dapeng Cao,Xiaofei Zeng,Jianfeng Chen
Electrocatalytic CO 2 reduction reaction (CO 2 RR) to multi-carbon product, especially for ethylene (C 2 H 4 ), provides a favorable pathway for carbon neutrality and renewable energy storage. However, the second-order C-C coupling reactions in CO 2 RR need always the high activation/driven energy in dynamics originating from the trace C 1 intermediate product. Herein, we synthesized the Ag-decorated Cu 2 O porous hollow core-shell catalyst named Ag@Cu 2 O where Ag nanoparticles uniformly distributed on inner the surface of the hollow Cu 2 O (H-Cu 2 O) via the sacrificial template method. Benefiting from the synergistic hollow structure and electron transfer from Cu and Ag to O, Ag@Cu 2 O catalyst delivers the excellent C 2 H 4 Faradaic Efficiency (FE) of 55 % ± 2 % at −1.0 V (vs. RHE), which is superior to the most reported catalysts. More importantly, in situ infrared spectroscopy and density functional theory (DFT) calculations reveal the introduction of Ag can decrease the activation energy required for *CO and C-C coupling.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yanjun Wang,Yuancai Lv,Yifan Liu,Minghua Liu
Rapid industrial growth and widespread fertilizer application have led to nitrate contamination in water, threatening ecosystems and human health. There is growing interest in developing electrocatalysts to convert nitrates into ammonia, enabling wastewater recycling and transforming harmful substances into valuable ammonia. In this study, we presented an eco-friendly, cost-effective electrocatalyst suitable for large-scale industrial production. It was designed specifically for the electrochemical reduction of NO 3 – to NH 3 (NO 3 − RR). Cu 2 O nanoparticles were synthesized on Cu foam through a simple one-step in situ growth approach. The conversion of Cu + , serving as the active site during NO 3 − RR, into nanoscale Cu had been investigated. Cu + sites initiated the conversion of nitrate to nitrite and subsequently facilitated the reduction of nitrite to ammonia while being transformed into nano-grained Cu. The newly generated Cu, with a larger specific surface area and lower charge transfer resistance, improved Faradaic efficiency (FE) for NH 3 in the NO 3 − RR process. As a result, an impressive nitrate removal rate of 100 % and a relatively high ammonia yield rate of 1514.67 µg h −1 cm −2 , along with a low residue of nitrite-N (0.21 ppm) can be achieved in solutions containing 100 ppm of nitrate-N.
研究领域:
环境科学
·
电化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 15
·4551-4558
·
IF 6.641
Jiajie Bi,Suli Wu,Hongbo Xia,Lu Li,Shufen Zhang
Monodisperse semiconductor single-crystal spheres hold great potential for building photonic crystals owing to their higher refractive index and smoother surface than their corresponding polycrystalline ones. However, the difficulty in obtaining isotropic growth with a slower rate of nucleation and growth makes it challenging to synthesize highly uniform single-crystal spheres with sizes of several hundred nanometers. Herein, we designed a room temperature two-step reductive approach in the presence of both sodium citrate and PVP as capping ligands in a H2O/ethylene glycol (EG) mixed solvent. By this method, real monodisperse single-crystal solid Cu2O spheres were obtained. The key functions of EG, sodium citrate and PVP in the formation of single-crystal Cu2O spheres were investigated. The mechanism of isotropic growth of the monodisperse single-crystal solid Cu2O spheres is discussed in detail. The results indicate that copper citrate complex, PVP, hydrogen bonding and appropriate viscosity are all indispensable for isotropic growth. The diameter of the as-prepared single-crystal solid Cu2O spheres could be tuned from 168 nm to 265 nm by varying the amount of sodium citrate. The SEM and TEM images revealed that the prepared Cu2O spheres had a narrow size distribution and are single-crystal solid spheres. Using Cu2O spheres with different diameters as building blocks, amorphous photonic structures with vivid brown-red, green and pink colors were fabricated by a spray-coating method. Our results provide a method for preparing single-crystal solid semiconductor spheres, unveiling the possibility of using single-crystal spheres as building blocks for creating structural color.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Tianming Li,Mou He,Wen Zeng
Previously, the formation of polyhedral Cu 2 O crystal is usually proposed like that the seed crystals grow outward following the relative growth rates (R values) along different directions ( Inside-out Pattern ) or that the surrounding building blocks aggregate toward the center followed by ripening ( Outside-in Pattern ). However, in this study, simply mixing aqueous Cu(CH 3 COO) 2 , NaOH, and D-(+)-glucose in the order listed at 70 °C for a period, a distinct growth manner of Cu 2 O polyhedron was observed based on carefully recording the solution color changes and the elaborate time-dependent SEM/TEM observations, which was referred to All-direction Pattern . More specifically, the initially formed Cu 2 O nanoshuttles first self-aggregated into porous braided structure with well-defined cubic framework and then condensed into solid cube from all direction via consuming the surrounding fragments everywhere possible, rather than in gradient densification from inside-out or outside-in. After that, the solid cube fell into the common Outside-in Pattern , i.e., adsorbing the surroundings followed by ripening. Although many complex polyhedral submicrostructures have been already reported, to our best knowledge, Cu 2 O crystal that grows in such manner is barely observed. It is believed that such interesting growth mechanism of polyhedral crystals could be general. What's more, the 30 min-Cu 2 O powder was made into a gas sensor towards ethanol, the performance of which has reached the level of application.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Feiyu Yang,Jiamin Wang,Kailiang Yin,Huan Pang
Control and detection of sunset yellow (SY) are an utmost demanding issue due to its high risk of detrimental effects on living systems caused by excessive ingestion. In this study, we reported the synthesis of Cu@Cu2O nanoparticle-decorated B and N codoped porous carbon (BNPC) and its use in developing a novel electrochemical sensor for SY. The Cu@Cu2O-BNPC catalyst was fabricated through single-step polymerization, followed by carbonization. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy characterization results showed that Cu@Cu2O anchored on the porous BNPC successfully. Compared with the BNPC-modified electrode, it was found that the Cu@Cu2O-BNPC-modified electrode showed superior electrocatalytic activity in both electrochemical impedance spectroscopy and cyclic voltammetry tests. The as-prepared Cu@Cu2O-BNPC catalyst directly acted as a sensor for amperometric detection of SY without further assembling, which exhibited an ultrahigh sensitivity of 0.09 μA nM–1 cm–2, a low limit of detection (2.4 nM), and a wide linear detection ranging from 10 nM to 8 μM. To further validate its possible application, the proposed method was successfully used for the determination of SY in Fanta drinks with satisfactory results.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTEGRATED FERROELECTRICS
·
2021
·
IF 0.836
Ailing Yang,Zhikuang Dai
A green method was used to synthesize Cu2O@BSA nanoparticles (NPs). The influential factors on the morphologies of NPs were investigated. The result showed that the alkalinity of reactant solution plays an important role. Fourier transform infrared (FTIR) spectroscopy indicated that Cu2+ interacts strongly with O positioned at peptide chain and N in amide of BSA. The formation mechanism of Cu2O@BSA NPs depends on the unfolding of the peptide of BSA proceeds the electrostatic interaction between Cu2+ and BSA. The experimental results are of importance for fabrication of semiconductor NPs by using BSA or other protein as coating agents.
研究领域:
材料科学
·
生物化学
✓ 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）