JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 5
·3817-3824
·
IF 2.22
Xie Zhipeng,Zhou Yan,Guan Linlin,Muhammad Sajjad,Jiang Yuhan,Zhang Shuyu,Yu Chunxin,Jiao Yangjing,Zhang Shuangshuang,Ren Yang,Zhou Xiaowei,Liu Zhu
Effect of the impurity in Cu 2 O nanowire on the degradation of methyl orange under light irradiation in dark circumstances was investigated. Here, we present the fabrication of Cu 2 O nanowires at different temperatures (110, 130, 150, 170, and 190 °C) by a facile hydrothermal route. Meanwhile, at the synthesis temperature of 110–150 °C, the major impurity in Cu 2 O nanowires was Cu 4 O 3 , and a new Cu impurity was introduced in the Cu 2 O nanowires as the synthesis temperature increased from 170 to 190 °C. Overall, as the synthesis temperature increases from 110 to 190 °C, the total impurity decreases in Cu 2 O nanowires. The fast degradation rate in dark circumstances has been achieved in Cu 2 O nanowires for all synthesis temperatures, which can be attributed to the Cu 2+ in the Cu 4 O 3 impurity of Cu 2 O nanowires. This result shows that the Cu 2 O nanowires obtained at the synthesis temperature of 150 °C have the fastest degradation rate for both under light irradiation and in dark circumstances. It has been found that under light irradiation, the Cu impurity in Cu 2 O nanowires plays a vital role in the degradation of methyl orange. In the current scenario, different impurity contents influence the catalyst activity of Cu 2 O nanowires under the visible light or dark, respectively.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NANO
·
2018
·
IF 1.1
Xu Chen,Chunxin Yu,Xiaojiao Guo,Qinsong Bi,Muhammad Sajjad,Yang Ren,Xiaowei Zhou,Zhu Liu
Novelty Cu 2 O multi-branched nanowires and nanoparticles with size ranging from ∼ 15 nm to ∼ 60 nm have been synthesized by one-step hydrothermal process. These Cu 2 O nanostructures when used as anode materials for lithium-ion batteries exhibit the excellent electrochemical cycling stability and reduced polarization during the repeated charge/discharge process. The specific capacity of the Cu 2 O nanoparticles, multi-branched nanowires and microscale are maintained at 201.2 mAh/g, 259.6 mAh/g and 127.4 mAh/g, respectively, under the current density of 0.1 A/g after 50 cycles. The enhanced electrochemical performance of the Cu 2 O nanostructures compared with microscale counterpart can be attributed to the larger contact area between active Cu 2 O nanostructures/electrolyte interface, shorter diffusion length of Li + within nanostructures and the improved stress release upon lithiation/delithiation.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 5
·491
·
IF 4
Hao Yu,Shen Yan,Jiahua Zhang,Hua Wang
Electrocatalytic nitrate reduction reaction (NO3−RR) to ammonia (NH3) presents an alternative, sustainable approach to ammonia production. However, the existing catalysts suffer from poor NH3yield under lower concentrations of NO3−, and the kinetic understanding of bimetal catalysis is lacking. In this study, a Co3O4–modified Cu2+1O nanowire (CoCuNWs) catalyst with a high specific surface area was synthesized to effectively produce NH3from a 10 mM KNO3basic solution. CoCuNWs demonstrated a high NH3yield rate of 0.30 mmol h−1cm−2with an NH3Faradaic efficiency (FE) of 96.7% at −0.2 V vs. RHE, which is 1.5 times higher than the bare Cu2+1O NWs. The synergistic effect between Co3O4and Cu2+1O significantly enhanced both the nitrate conversion and ammonia yield. Importantly, it is revealed that the surface of CoCuNWs is kinetically more easily saturated with NO3−(NO2−) ions than that of Cu2+1O NWs, as evidenced by both the higher current density and the plateau occurring at higher NOx−concentrations. In addition, CoCuNWs exhibit a higher diffusion coefficient of NO3−, being 1.6 times higher than that of Cu2+1O NWs, which also indicates that the presence of Co3O4could promote the diffusion and adsorption of NO3−on CoCuNWs. Moreover, the ATR–SEIRAS analysis was applied to illustrate the reduction pathway of NO3−to NH3on CoCuNWs, which follows the formation of the key intermediate from *NO2−, *NO, *NH2OH to *NH3. This work presents a strategy for constructing dual–metal catalysts for NO3−RR and provides an insight to understand the catalysis from the perspective of the kinetics.
研究领域:
电化学
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催化材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 45
·22996-23002
·
IF 7.443
Jing Bai,Yunpo Li,Rui Wang,Ke Huang,Qingyi Zeng,Jinhua Li,Baoxue Zhou
In this study, a novel three dimensional (3D) ZnO/Cu2O nanowire (NW) photocathode material with highly efficient photoelectrocatalytic performance was prepared on a copper substrate using simple, cost-effective wet chemical oxidation and hydrothermal growth methods. FE-SEM, TEM, XRD and XPS were used to investigate the 3D ZnO/Cu2O NWs, revealing the formation of the high density orientated Cu2O NW cores and ZnO NW shells. Compared with the pure Cu2O NWs, the 3D ZnO/Cu2O NWs showed a larger photocurrent (−4.55 mA cm−2) and better stability under AM 1.5G illumination (100 mW cm−2). In light of the high effective surface area and the ability to facilitate good electron transportation, this unique nanostructure will be favorable for efficient photoelectrocatalytic (PEC) water splitting and organic pollutant degradation.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 24
·10338-10346
·
IF 3.5
Li Ma,Huiling Liu,Cheng Wang
Electrocatalytic reduction of biomass-derived furan compounds provides a green and sustainable approach to produce value-added fuels and chemicals. Despite the achievements in unimolecular transformation, C–C coupling which holds great promise to yield precursors for high-density fuels has not received extensive attention. Herein, we report a Cu2O-derived nanowire array material with switchable selectivity to electrocatalytic reduction of furfural depending on the electrolyte pH. Besides a high selectivity of 98.4% to furfuryl alcohol via hydrogenation at pH 9.5, the Cu2O-derived array structure also exhibits a high selectivity of 83.5% to hydrofuroin via C–C coupling at pH 14. Upon control experiments and detailed characterization of the electrodes, the array architecture is proposed to decrease the diffusion of ketyl radicals which are the key intermediates for C–C coupling. The confined diffusion results in a high local concentration of the radicals in the array and facilitates their collision for enhancing the formation of hydrofuroin.
研究领域:
化学工程
·
电催化
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 8
·3979-3988
·
IF 2.302
Li Ga Long,Ma Pei,Zhang Yi Fan,Liu Xiao Li,Zhang Huan,Xue Wei Ming,Mi Yu,Luo Yan E.,Fan Hai Ming
Cu 2 O nanowire mesocrystals (NWMCs), which possess well-defined octahedral morphology and high-porosity architecture with anisotropic interpenetrating nanowires, have attracted considerable attention owing to their superior physical and chemical properties. However, the current synthetic approach for Cu 2 O NWMCs using graphene oxide as modifier leads to uncontrollable products and low productivity (~30 %), which largely hinder their further industrial application. Herein, we report a modified synthetic approach for controllable and large-scale preparation of Cu 2 O NWMCs using perylene-3,4,9,10-tetracarboxylic dianhydride molecule as modifier. The effects of growth time and initial pH on the morphology of final products have been systemically investigated. Under the optimal reaction condition with initial pH of 5.3 and reaction time of 15 h, the well-defined octahedral Cu 2 O NWMCs can be obtained with a productivity as high as ~75 %. In addition, this synthetic approach can be easily scaled up from 50 to 500 mL autoclave. The ability of high productivity and reproducibility in synthesis of Cu 2 O NWMCs enable us to further study their peroxidase-like activity by catalyzing the oxidation of o -phenylenediamine in the presence of H 2 O 2 . The Cu 2 O NWMCs have exhibited a superior catalytic activity with the K
cat of 1.14 × 10 −2 , 10 times higher than that of horseradish peroxidase. Moreover, the Cu 2 O NWMCs can also retain 69.5 % of their initial activities after 10-batch redox reactions. Our results provide a facile approach to controllable and large-scale synthesis of Cu 2 O NWMCs using homogeneous molecule modifier and open up opportunities to use Cu 2 O NWMCs as nanozyme for future industrial application.
研究领域:
材料科学
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催化化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2020
·Vol. 63
·期 7
·1012-1018
·
IF 6.356
Guo Xiaoxi,Wu Jinghua,Xia Lian,Xiang Meihao,Qu Fengli,Li Jinghong
Photoelectrochemical (PEC) biosensors have shown great promise in bioanalysis and diagnostic applications in recent years. In this work, the CuO/Cu 2 O nanowire array (CuO/Cu 2 O Nanowire) supported on copper foam was prepared as a photocathode for detection of tyrosinase though quinone-chitosan conjugation chemistry method. The in-situ generated quinones that were the catalytic product of tyrosinase acted as electron acceptors, which were captured by the chitosan deposited on the surface of the electrode. Direct immobilization of electron acceptor on the electrode surface improved the photocurrent conversion efficiency and thus sensitivity. The as-prepared biosensor can realize a rapid response in a wide linear range of 0.05 U/mL to 10 U/mL with the detection limit as low as 0.016 U/mL of tyrosinase. The current work provides a new perspective to design and develop highly sensitive and selective PEC biosensor.
研究领域:
生物分析
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诊断技术
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 6
·1-9
·
IF 6.232
Li Xiaomeng,Kong Weisu,Qin Xia,Qu Fengli,Lu Limin
A facile and sensitive self-powered cathodic photoelectrochemical (PEC) aptasensor is reported for the detection of prostate-specific antigen (PSA) based on CuO-Cu 2 O nanowire array grown on Cu mesh (CuO-Cu 2 O NWA/CM) as electrode. The mixed narrow band gaps of the CuO-Cu 2 O heterostructure ensured its wide absorption band, effective electron/hole separation, and high photocatalytic activity in the visible region. In addition, nanowires directly grown on the substrate provided high specific surface area and exposed abundant active sites, thus guaranteeing its high photocatalytic efficiency. Therefore, the self-powered sensor exhibited favorable analytical performance with fast response, wide linear ranges of 0.01 to 5 ng/mL and 5 to 100 ng/mL, an acceptable detection limit of 3 pg/mL, and reasonable selectivity and stability. The proposed CuO-Cu 2 O NWA/CM can be considered a promising visible light-responsive photoactive material for fabrication of PEC aptasensor with high performance.
a Schematic illustration of construction process of PEC sensing platform based on the CuO-Cu 2 O composite for PSA detection. b Schematic mechanism of the operating PEC system.
研究领域:
分析化学
·
生物传感器
·
纳米材料
·
癌症诊断
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Tao Feng,Chaofan Yu,Daniel Manaye Kabtamu,Le Bu,Fengting Li,Ying Wang
Accurate glucose sensing in complex biological fluids could enable diagnostics for home healthcare. However, glucose oxidase (GO x ) has been suffered from poor reproducibility and chemical instability due to intrinsic nature of enzymes. Here, we report a free-standing and robust reduced graphene oxide wrapped Cu foam (rGO/CuF)-supported Cu 2 O nanowires (Cu 2 O NWs) with exposed {111} facet via facile electrodeposition route. When being used as an electrode for nonenzymic glucose detection, Cu 2 O NWs@rGO/CuF exhibited the distinguished performances with powerful reliability for analyzing human plasma and even whole blood samples. These unprecedented performances could be ascribed to nanoscale hydrophilic structure of Cu 2 O NWs, which could control the fouling level especially for protein. Moreover, taking into account the Cu 2 O NWs with exposed {111} facet, Cu 2 O NWs {111} could reduce ion diffusion distance and couple with improved electronic conductivity, thus leading to high glucose sensitivity. Through the theoretical calculations, a reliable interpretation of the catalytic mechanism with Cu 2 O NWs {111} has been provided. This study deepens the understanding of hydrophilic nanostructure and facet-dependent activity of Cu 2 O NWs and points out a strategy to improve their sensitivity and stability.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
生物医学工程
✓ 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）