JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 12
·8282-8288
·
IF 1.354
Tang Yuanyuan,Xu Yinlong,Qi Caiyu,Li Xianyang,Xing Enming,Wang Fei,Kan Zigui,Wang Chunling,Tang Junyan,Zheng Guilin,Zhang Kun,Wang Xihong,Li Caolong,Yang Ke
Cu2O nanocubes with different size (ranging from 20 nm to 400 nm) were prepared by a seed-mediated method to systematically explore the strong size-dependent properties in photocatalytic degradation of methyl orange (MO). Cu2O nanotubes were characterized by TEM,
XRD, UV-Vis measurements. The size-dependent photocatalytic efficiency of the Cu2O nanocubes was evaluated by degradation of methyl orange (MO) in water under visible light (λ > 420 nm) irradiation. Furthermore, the photocurrent, linear sweep voltammetry (LSV) and
electrochemical impedance spectra (EIS) measurements were applied to elucidate the size-dependent properties of Cu2O nanocubes, which demonstrated that smaller Cu2O nanocubes with certain length (30 nm) showed higher current density, faster electron transfer and lower
rate of charge recombination in their exposed (100) facet. Therefore, 30 nm Cu2O nanocubes showed stronger visible light absorption capacity and higher photocatalytic activity in MO degradation among a series of nanocubes (20, 30, 100, 130, 200 and 400 nm) and their corresponding
photocatalytic activities decreased with increasing the particles sizes.
研究领域:
材料科学
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环境科学
·
电化学
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产品关联
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 134
·期 1
·243-257
·
IF 2.081
Zhang Wenfei,Zhou Qulan,Qi Ji,Li Na
Cu 2 O films were prepared using an improved solution immersion method, whereas ZnO/Cu 2 O films were prepared using an electrodeposition method. Then, the pure Cu 2 O film electrodes and ZnO/Cu 2 O film electrodes were used to reduce CO 2 to CH 3 OH. The crystal structure, morphology, particle size, and specific surface area of pure Cu 2 O films prepared under different immersion times and ZnO/Cu 2 O films prepared under different deposition times and Zn 2+ concentrations were analyzed using X-ray diffraction, scanning electron microscopy, and Brunauer–Emmett–Teller analysis. The electrolytic activity of the pure Cu 2 O film electrodes and ZnO/Cu 2 O film electrodes were studied. Under the same reaction conditions, the ZnO/Cu 2 O film electrode with the Zn 2+ concentration of 0.05 M and the deposition time of 30 min had the highest total CH 3 OH yield of 315.656 μmol/cm 2 and the fastest formation rate of 52.609 μmol/(cm 2 h), and its faradaic efficiency was 45%, which was remarkably higher than that of pure Cu 2 O film electrodes under the same reaction conditions. This study highlighted that ZnO nanoparticles had a very good promotion of electrolytic CO 2 reduction on Cu 2 O film.
研究领域:
材料科学
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电化学
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环境科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yaoyi Li,Kexin Chen,Xi Wang,Zijun Xiao,Gaozu Liao,Jing Wang,Xukai Li,Yiming Tang,Chun He,Laisheng Li
In this study, reduced graphene oxide (rGO) was used to fabricate a Z-scheme BiVO 4 -(rGO-Cu 2 O) photocatalyst for the degradation of Tetrabromobisphenol A (TBBPA) under sunlight irradiation. The photocatalyst was synthesized using a three-step method BiVO 4 -(rGO-Cu 2 O) photocatalyst with an rGO loading of 1% and (rGO-Cu 2 O) to BiVO 4 ratio of 50% achieved the best degradation effect for TBBPA removal. Electron paramagnetic resonance spectroscopy (EPR) confirmed that the charge transfer path of BiVO 4 -(rGO-Cu 2 O) follows that of Z-scheme photocatalysts. Moreover, the addition of rGO increases the charge transfer efficiency. High performance liquid chromatography-mass spectrometry (HPLC-MS) was used to detect and analyze intermediate products, allowing the proposal of the main degradation pathway of TBBPA. Photogenerated electrons of BiVO 4 -(rGO-Cu 2 O) were then transferred into the conduction band of Cu 2 O. Cu 2 O is located in the surface layer, which has the most effective contact area with pollutants, and therefore has a good outcome for the photocatalytic reduction of TBBPA. Photogenerated electrons (e − ) and hydroxyl radicals (∙OH) are the main factors affecting TBBPA degradation. The degradation process of TBBPA includes electron reduction debromination , hydroxylation , and β-cleavage. In our work, BiVO 4 -(rGO-Cu 2 O) was successfully synthesized to degrade TBBPA; this study brings forth a novel approach for the degradation of halogenated organic pollutants using a Z-scheme photocatalytic composite.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zunjie Zhang,Bingcheng Ge,Mengran Liu,Tianfang Yang,Shuaitong Wang,Yang Liu,Yingjie Yang,Shuyan Gao
The electrocatalytic reduction reaction of nitrate (NO3RR) is anticipated to convert nitrogen-containing pollutants into valuable ammonia products. Copper-based catalysts have received great attention because of their good performance in the NO3RR due to the strong binding energy with *NO3 intermediates. However, the poor H2O dissociation ability of Cu is unable to provide H• in time for the hydrogenation reaction of NOx, thus hindering the electroreduction of the NO3–. Herein, we designed a shell–core nanocube electrocatalyst Cu2O@Ni(OH)2-x (x represents the molar ratio of Ni/Cu) using the liquid phase reduction combined with the etching and precipitation method for electrocatalytic NO3RR. Due to the synergistic effect between the strong nitrate activation ability of Cu and the excellent H2O dissociation ability of Ni(OH)2, Cu2O@Ni(OH)2-3.3% shows an impressive ammonia yield rate (557.9 μmol h–1 cm–2) and Faradaic efficiency (97.4%) at −0.35 V vs. RHE. Operando Raman and Auger electron spectroscopy observe the reduction of Cu2O to Cu during the NO3RR process. Density functional theory calculations combined with electron paramagnetic resonance analysis reveals that Ni(OH)2 can lower the activation energy barrier of H2O dissociation, thereby promoting the generation of H• and accelerating the hydrogenation of *NO during the NO3RR. This research provides an efficient Cu-based catalyst for reducing NO3– and may motivate the development of effective ammonia electrocatalysts for further experimentation.
研究领域:
材料科学
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电催化
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Jing Xu,Zezhong Li,Zhenlu Liu,Shengming Xu,Xinyu Liu
A novel composite is constructed by loading ZIF-8 on Cu 2 O by in situ growth. By visible light driven semiconductor and π-π* conjugation effect of the metal–organic framework, the migration ability of photogenerated carriers is improved, and electrons are accumulated to participate in hydrogen ion reduction. The superior hydrogen evolution performance (981.8 μmol·g −1 ·h −1 ) and stability test indicate that the coupling of ZIF-8 and semiconductor Cu 2 O successfully improves the catalytic capacity of the material. Cu 2 O provides a place to stimulate activity for ZIF-8 with high specific surface area. The electron transfer mechanism in composites is studied by electrochemical and spectroscopy methods. This work also provides a new opportunity for the in-situ growth of metal–organic frame materials onto single-metal oxides.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shanshan Qiao,Yuqing Chen,Yanhong Tang,Jili Yuan,Jiachao Shen,Danyu Zhang,Yi Du,Ziru Li,Dingwang Yuan,Haifang Tang,Chengbin Liu
Cu 2 O is promising to catalytically convert CO 2 into C 2 products by overcoming the instability and slow multi-electron transfer. Regulating catalytic construction and interface microenvironment is challenging to stabilize Cu 2 O and selectively convert CO 2 to C 2+ hydrocarbons. A photocatalyst (Cu 2 O@Cu-CN) of oxygen vacancy–rich Cu 2 O@Cu symbiont embedded in N -doped carbon skeleton is achieved by ligand competition strategy. The Schottky junction and the hydrophobic microenvironment in the catalyst together stabilize the active site against the Cu 2 O redox reaction. The hydrophobic interface can make the catalyst favorable for trapping CO 2 . The asymmetric interface with oxygen vacancy can enhance the adsorption and activation of CO 2 and *CO, thus reducing the energy barrier for the formation of *OCCO intermediates and promoting the coupling conversion of *OCCO to C 2 H 4 . The C 2 H 4 evolution rate reaches 46.27 μmol C2H4 g cat -1 h −1 with a high selectivity of 40.3 % using triethanolamine (TEOA) as a sacrificial agent, and the apparent quantum yield (AQY) is as high as 14.41 % (λ = 420 nm). The C 2 H 4 evolution rate is 2.10 μmol C2H4 g cat -1 h −1 in water without TEOA. Moreover, the productive rate of C 2 H 4 still maintains 95.37 % after lasting 20 h, showing a robust long − term stability.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2021
·
IF 3.407
Pinhua Zhang,Wenhao Di,Kaifeng Xue,Guangliang Cui
Cu 2 O/ZnO heterostructure ordered nanoarrays were prepared with an in situ electrodeposition method for H 2 S detection in biological samples at room temperature. Based on this new material, a novel sensor was proposed, which exhibited good performances for sensitivity and selectivity for bio-H 2 S detection due to the surface/interface effects and long-range ordered structure. It was confirmed by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) that these good performances were mainly attributed to the conversion of Cu 2 O to metallic Cu x S on the surface of the ordered structure. In addition, the sensor had good portability due to its small size. Our results suggest that the Cu 2 O/ZnO heterostructure ordered nanoarrays are promising candidates for high-performance H 2 S sensors applied in disease diagnosis and environmental assessment.
研究领域:
材料科学
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生物学
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环境科学
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DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 5
·487
·
IF 4.501
Mengyi Han,Xue Tang,Peng Wang,Zhiyong Zhao,Xiaohua Ba,Yu Jiang,Xiaowei Zhang
The selective oxidation of styrene with highly efficient, environmentally benign, and cost-effective catalysts are of great importance for sustainable chemical processes. Here, we develop an in situ self-assembly strategy to decorate Cu-based metal-organic framework (MOF) Cu-BDC-NH2nanocrystals on Cu2O octahedra to construct a series of Cu2O@Cu-BDC-NH2catalysts for selective oxidation of styrene. Using H2O2as green oxidants, the optimized sample of Cu2O@Cu-BDC-NH2-8h could achieve 85% styrene conversion with 76% selectivity of benzaldehyde under a mild condition of 40 °C. The high performance of the as-prepared heterogeneous catalysts was attributed to the well-designed Cu+/Cu2+interface between Cu2O and Cu-BDC-NH2as well as the porous MOF shells composed of the uniformly dispersed Cu-BDC-NH2nanocrystals. The alkaline properties of Cu2O and the –NH2modification of MOFs enable the reaction to be carried out in a base-free condition, which simplifies the separation process and makes the catalytic system more environmentally friendly. Besides the Cu2O octahedra (od-Cu2O), the Cu2O cuboctahedrons (cod-Cu2O) were synthesized by adjusting the added polyvinyl pyrrolidone, and the obtained cod-Cu2O@Cu-BDC-NH2composite also showed good catalytic performance. This work provides a useful strategy for developing highly efficient and environmentally benign heterogeneous catalysts for the selective oxidation of styrene.
研究领域:
化学工程
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催化科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Le Ding,Haosheng Lan,Xin Li,Zhanhong Zhao,Yansen Qu,Yingjie Xia,Xinghua Chang
Electrochemical nitrate-to-nitrogen conversion provides an available approach for efficient waste water remediation. However, high nitrogen selectivity is difficult to achieve, due to inappropriate aquatic H supply for hydrogenation of oxynitride intermediates and relatively high energy barrier for N O bond breakage. In this study, Cu 2 O/FeO heterojunction is constructed to drive electrochemical nitrate reduction. A straightforward apparent kinetic analysis was performed to define the formation rate of the key nitrogen compounds.Comprehensive structure and electrochemical analysis combined with Density Functional Theory (DFT) calculation were performed to elucidate the underlying mechanism for enhanced nitrate-to-nitrogen conversion efficiency based on Cu 2 O/FeO heterojunction. FeO introduction is confirmed to beneficial for moderate water cracking, providing right amount of aquatic *H to adapt the hydrogenation processes during nitrate to nitrogen conversion. Moreover, FeO introduction induces the generation of Cu 2 O/FeO heterojunction. Self-driven local charge redistribution takes place at the Cu 2 O/FeO heterointerface, resulting in nucleophilic and electrophilic regions. Such unique structure is conducive to targeted asymmetric adsorption of oxynitrides in a configuration of Cu O N Fe, thus facilitating fracture of N O bond and promoting the generation of *N. Excess accumulation of *N is beneficial for nitrogen generation through *N-*N coupling, resulting in high nitrogen selectivity. As a result, the optimized Cu 2 O/FeO electrode exhibits excellent electrocatalytic nitrate reduction reaction (eNO 3 RR) performance, featured for a high nitrate removal rate of ∼ 100 % and 81.58 % nitrogen selectivity at −0.7 V (vs. RHE) after 8 h electrolysis.
研究领域:
环境科学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Bingwang Yang,Ning Han,Liying Zhang,Shasha Yi,Zongtao Zhang,Yu Wang,Ying Zhou,Deliang Chen,Yanfeng Gao
The combination of noble metal and transition metal oxide (TMO) can effectively expand their application in electrochemistry. However, rational design and convenient fabrication of the noble metal/TMO nanoarray is rarely reported. Here, Cu 3 Pt/Cu 2 O nanorod array was constructed on copper substrate by a convenient method and used as non-enzymatic glucose detector. In the nanorod, Moreover, the glycol ligand acted as a bridge for electron transfer from Cu 2 O at surface to Cu 3 Pt and the nanorod structure of Cu 3 Pt could serve as a highway for electron transfer, hence, when the Cu 3 Pt/Cu 2 O nanorod array was used as glucose detector, it delivered enhanced linear detection range (0.005–0.1 mM, 0.1–1.5 mM and 1.5–10 mM), high corresponding sensitivity (5082 μA mM −1 cm −2 , 3331 μA mM −1 cm −2 and 118 μA mM −1 cm −2 ), fast response time (<6 s), low detection limit (1.759 μM, S/N = 3) and high selectivity.
研究领域:
材料科学
·
电化学
·
生物传感
✓ 已验证
DOI
高影响因子
Journal of Oceanology and Limnology
·
2020
·Vol. 38
·期 5
·1517-1531
·
IF 0.617
Tian Jing,Chen Zhuoyuan,Jing Jiangping,Feng Chang,Sun Mengmeng,Li Weibing
The Cu 2 O/TiO 2 p-n heterojunction composite photoelectrodes were prepared by depositing Cu 2 O nanoparticles on the surface of TiO 2 nanotubes via anodic oxidation and constant current deposition. Field emission scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses showed that Cu 2 O nanoparticles not only deposited on the surface of TiO 2 nanotube array, but also on the wall of TiO 2 nanotubes. The Cu 2 O deposition amount could be adjusted by changing the deposition time. The photoelectrochemical cathodic protection (PECCP) performance of the prepared photoelectrodes for 316L stainless steel (SS) was tested under visible light. The constant current deposition time had a significant effect on the PECCP performance of Cu 2 O/TiO 2 -X photoelectrodes and Cu 2 O/TiO 2 -20 had the best PECCP performance for the coupled 316L SS. This was attributed to the appropriate amount and thickness of Cu 2 O to form p-n heterojunctions with TiO 2 , in which separation of the photogenerated carriers was accelerated and transfer of the photogenerated electrons to 316L SS for PECCP was facilitated.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Dan Li,Jiahui Yang,Shuang Lv,Xiaopeng Li,Li Shao,Caiyun Zhou,Feigao Xu
Unique Fe3S4/Cu2O composites were constructed with high Fenton-like photocatalytic activity through the impregnation coprecipitation method. The structure, morphology, optical, magnetic, and photocatalytic properties of the as-prepared composites were explored in detail. The findings suggest that small Cu2O particles were grown on the surface of Fe3S4. The removal efficiency of TCH by Fe3S4/Cu2O was 65.7, 4.75, and 3.67 times higher than that of pure Fe3S4, Cu2O, and the Fe3S4 + Cu2O mixture, respectively, when the mass ratio of Fe3S4 and Cu2O was 1:1 at pH 7.2. The synergistic effect between Cu2O and Fe3S4 was the main factor for TCH degradation. The Cu+ species from Cu2O increased the Fe3+/Fe2+ cycle during the Fenton reaction. •O2– and h+ were the main active radicals; however, •OH and e– played the second role in the photocatalytic degradation reaction. Moreover, the Fe3S4/Cu2O composite retained good recyclability and versatility, and could be conveniently separated by a magnet.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）