Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Yun Wang,Sheng Xu,Haiyuan Zhang,Yuyin Wang,Enmao Wang,Zeyu He,Jiahua Zhu,Xiaohua Lu,Lilong Zhang,Yang Bai,Kunfeng Zhao,Qingwei Gao,Jianrong Zeng,Zhiguo Yi,Tingzhen Ming,Wei Li,Liwen Mu
Methane is a potent greenhouse gas, contributing 30 % of global warming. Herein, we report a low cost but efficient CuO x /ZnO nanocomposite photocatalyst for total oxidation of methane into carbon dioxide under ambient conditions. The results show that the addition of a small amount (0.05 wt%) of CuO x enhances the methane photo-oxidation activity of ZnO by about 7-fold. More importantly, the CuO x /ZnO demonstrates good durability evidenced by steady performance after multiple cycles or after long-term storage. The promising performance of CuO x /ZnO is attributed to two facts, i) highly dispersed CuO x on the ZnO surface (indicated by N 2 O selective oxidation experiments and X-ray absorption fine structure (XAFS)); ii) enhanced methane adsorption and carbon dioxide desorption on CuO x /ZnO surface. The photocatalytic reaction mechanism of methane on CuO x /ZnO was also investigated by in situ Fourier transform infrared spectroscopy (FTIR) and density functional theory (DFT) calculations. The results show that the highly dispersed Cu atoms on the ZnO surface favor the continuous oxidation of *OCH 3 . The potential value of our work lies in its capacity to mitigate or even eliminate the greenhouse effect.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
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2024
·Vol. 191
·期 6
·1-14
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IF 5.3
Guo Qi,Wang Du,Ma Fei,Fang Mengxue,Zhang Liangxiao,Li Peiwu,Yu Li
Phytosterols (PSs), a class of naturally occurring bioactive lipid compounds, have been found to possess a significant cholesterol-lowering effect. In developing countries, the consumption of rapeseed oil is the primary pathway of PS intake for the general population. However, developing low-cost, real-time, and high-throughput screening techniques for PSs remains a challenge. Here, a Cu-based nanocomposite CuOx@C was synthesized via a simple method of the calcination of HKUST-1 and systematically characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The CuOx@C demonstrated excellent peroxidase-like (POD-like) activity, functioning as a peroxidase mimic to facilitate the catalysis of 3,3′,5,5′-tetramethylbenzidine (TMB) into its oxidized form (oxTMB), thereby initiating a discernible color response. On the basis of this discovery, a CuOx@C-based colorimetric method for detecting total sterols in rapeseed was successfully constructed via cascade reactions. After optimizing the conditions, the high-throughput screening of total sterols in rapeseed could be completed in only 21 min, which significantly facilitated the sensing of PSs. A linear range of 0.6–6 mg/g was achieved for the detection of total sterols in rapeseed samples, thereby satisfying the requirements for detection. In addition, due to the high stability of CuOx@C and the specificity of cholesterol oxidase, the developed method had excellent stability and selectivity toward PSs, indicating that this work has huge prospects for commercial application. This innovative work overcomes the limitation of the instrumental method and provides a portable and reliable tool for total sterols detection. It can also facilitate the development of oilseeds with a high content of PSs. Graphical abstract
研究领域:
生物化学
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食品科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
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2018
·Vol. 6
·期 29
·14431-14439
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IF 9.931
Qianqian Zhou,Ting-Ting Li,Jinjie Qian,Yue Hu,Fenya Guo,Yue-Qing Zheng
The preparation of low-cost and efficient bifunctional catalysts towards water splitting is essential for the production of clean H2 energy. Herein, a hierarchical Co3O4-decorated CuO–Cu2O nanorod core–shell structure was in situ grown on a Cu foam (denoted as CuOx@Co3O4 NRs/CF) and investigated as a bifunctional catalyst for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline solution. Benefiting from its large electrochemical surface area and the synergetic effects between the CuOx core and Co3O4 shell, CuOx@Co3O4 NRs/CF exhibited considerable catalytic activity, which resulted in a small overpotential of 240 mV for the OER and 242 mV for the HER at a current density of 50 mA cm−2, along with low Tafel slopes of 46 and 61 mV dec−1, respectively. Remarkably, CuOx@Co3O4 NRs/CF could continuously produce O2 or H2 for at least 24 h with negligible decline in catalytic activity, and it gave rise to high faradaic efficiencies of 99.7% and 96.4% for the OER and HER, respectively. The electrochemical performance of CuOx@Co3O4 NRs/CF was dramatically improved as compared to those of its CuOx NRs/CF counterpart and also most reported Cu-based water splitting electrocatalysts.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2015
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IF 2.169
Wenfei Shen,Chunpeng Yang,Xichang Bao,Liang Sun,Ning Wang,Jianguo Tang,Weichao Chen,Renqiang Yang
A simple, solution-processed ultrathin CuO X anode buffer layer was fabricated for high performance organic solar cells (OSCs). XPS measurement demonstrated that the CuO X was the composite of CuO and Cu 2 O. The CuO X modified ITO glass exhibit a better surface contact with the active layer. The photovoltaic performance of the devices with CuO X layer was optimized by varying the thickness of CuO X films through changing solution concentration. With P3HT:PC 61 BM as the active layer, we demonstrated an enhanced PCE of 4.14% with CuO X anode buffer layer, compared with that of PEDOT:PSS layer. The CuO X layer also exhibits efficient photovoltaic performance in devices with PBDTTT-C:PC 71 BM as the active layer. The long-term stability of CuO X device is better than that of PEDOT:PSS device. The results indicate that the easy solution-processed CuO X film can act as an efficient anode buffer layer for high-efficiency OSCs.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2022
·
IF 8.047
Chaoxin Zhang,Yanmei Huang,Bohang Zhao,Yu Yu,Yifu Yu,Bin Zhang
Photocatalytic nitric oxide (NO) synthesis from air is an attractive way to supersede the conventional nitrogen fixation manufacturing technique accompanied by high energy requirements and greenhouse gas emission. The development of efficient photocatalysts for direct solar-driven N 2 oxidation to NO without external thermal assistance is highly challenged. Here, CuO x clusters decorated TiO 2 nanoflowers with various copper contents are constructed and used for solar-driven air reaction into NO under ambient conditions. When the copper content is 1 wt%, the sample shows the optimal performance with a yield rate of 35.0 mmol m −2 h −1 (7.7 μmol h −1 ) and an apparent quantum efficiency of 1.77% at 365 nm. A series of in situ and ex situ characterizations reveal Cu 2 O species and TiO 2 support form direct Z-scheme heterojunction over 1%Cu-TiO 2 . This heterojunction can promote the adsorption and activation of nitrogen and oxygen reactants, leading to the performance enhancement of NO photosynthesis from air. Also, we proposed a possible NO photosynthesis reaction pathway over 1%Cu-TiO 2 .
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
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2025
·
IF 6.3
Pengcheng Jiao,Xiutao Yang,Yuying Wang,Hongwen Yu,Ying Zeng,Guopeng Zhu,Chunhui Wang,Deming Han
Rational design on the microstructure and chemical composition of transition metal-based electrode materials is critical for boosting electrochemical glucose detection. In this work, the hollow heterostructured CuO x @Co 3 O 4 nanotube arrays on Cu foam (CuO x @Co 3 O 4 NTAs/CF) were fabricated. Coupling Co 3 O 4 nanoparticles on CuO x nanotube modulates the electronic structure by heterostructure, enhancing charge transfer during electrocatalytic glucose oxidation. Moreover, the unique hierarchical tubular core-shell structure guarantees abundant well-distributed active sites and rapid pathways for glucose and electrolyte diffusion. Beneficial from the advanced structure, the sensor fabricated with CuO x @Co 3 O 4 NTAs/CF possesses a high sensitivity of 23347.4 μA mM⁻¹ cm⁻² at linear range of 10-527 μM and low limit of detection of 0.56 μM (S/N=3). In addition, the outstanding selectivity, reproducibility and long-term stability (94.5 % for 30 days) as well as good recovery rate in artificial saliva, sweat, and human serum samples are also accessible advantages for our fabricated sensor. The excellent sensing performance of CuO x @Co 3 O 4 NTAs/CF demonstrates its potential application for electrochemical glucose detection.
研究领域:
材料科学
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2024
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IF 10.8
Zhuoyan Lv,Yangming Ding,Leilei Kang,Lin Li,Xiao Yan Liu,Aiqin Wang,Tao Zhang
Direct epoxidation of propylene (DEP) by molecular oxygen is an ideal way to synthesize propylene oxide (PO), yet it remains quite challenging. We demonstrated here that the PO formation rate and selectivity could be enhanced simultaneously through photo-thermo-catalysis over the CuO x /TiO 2 catalyst. At 180 °C, by introducing light, the PO formation rate increased more than 20-fold (from 8.2 to 180.6 μmol g −1 h −1 ) and the corresponding selectivity improved more than 3-fold (from 8 % to 27 %), breaking the traditional perception that the semiconductors exhibit very low reactivity for this reaction. Kinetic study results showed that the apparent activation energy for PO formation could sharply decrease under light irradiation (from 95 to 40 kJ mol −1 ). In situ electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were applied to characterize the dynamics of the valence state of the copper oxide species and the activation intermediates of molecular oxygen. Evidence for the activation of oxygen, which could direct to the PO formation pathway, was captured. The light-driven electrons could promote the formation of active Cu + , which could form the side-on μ-peroxo Cu(II) 2 structure, weaken the O–O bond, and improve the PO formation rate and selectivity. This work paves a new way for designing semiconductor-supported photocatalysts for DEP reactions with molecular oxygen.
研究领域:
化学工程
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催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Qiaohong Su,Qingcui Liu,Pengyue Wang,Juan Ding,Jiulin Wang,Yudai Huang
High overpotential and low stability are major challenges for hydrogen evolution reaction (HER)/oxygen evolution reaction (OER). Tuning the electronic structure of catalysts is regarded as a core strategy to enhance catalytic activity. Herein, we report CuO x /Cu nanorod skeleton supported Ru doped cobalt oxide/nitrogen-doped carbon nanocomposites (Ru-CoO/NC/CuO x /Cu, denoted as RCUF) as bifunctional catalysis. The one-dimensional/three-dimensional (1D/3D) nanostructure and defect-rich amorphous/crystalline phases of RCUF facilitates active site exposure and electron transport. Experimental characterization and density functional theory (DFT) calculation results indicate that Ru doping can optimize the electronic structure, which accelerates the water dissociation process and reduces the Gibbs free energy of the reaction intermediates. As expected, the optimal RCUF-900 exhibits low overpotential (25/205 mV at 10 mA cm −2 ) and high stability (100/100 h) for HER/OER. RCUF-900 has low voltage (1.54 V at 10 mA cm −2 ) and high stability (100 h) for overall water splitting. This work provides new insights into the design of advanced catalysts for overall water splitting.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2018
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IF 8.097
Junfang Ding,Liping Li,Huixia Li,Shaoqing Chen,Shaofan Fang,Tao Feng,Guangshe Li
Interfacial regulation offers a promising route to rationally and effectively design advanced materials for CO preferential oxidation. Herein, we initiated an interfacial regulation of CeO2–CuOx–RGO composites by adjusting the addition sequence of the components during the support formation. The presence of RGO along with the sequence tuning of the components is confirmed to survey the changes of the oxidation state of copper species, the content and distribution of the Cu+ site, and the synergistic interactions between Cu–Ce mixed oxides and reduced graphene oxide (RGO) over the catalysts. These catalysts were systematically characterized by inductively coupled plasma, X-ray diffraction, transmission electron microscopy/high-resolution transmission electron microscopy, hydrogen temperature-programmed reduction, X-ray photoelectron spectra, thermal gravimetric analysis, Raman spectra, and in situ diffuse reflectance infrared Fourier transform spectroscopy measurements. The results show that RGO is favorable for the generation of Cu+ and the dispersion of copper–cerium species in the as-prepared catalysts. Furthermore, by multi-interfacial regulation of the CeO2–CuOx–RGO composites, the catalyst CeO2/CuOx–RGO exhibits a strikingly high catalytic oxidation activity at a low temperature coupled with a broader operation temperature window (i.e., CO conversion >99.0%, 140–220 °C) in the CO-selective oxidation reaction, which has been attributed to the high content of the active species Cu+ enriched on the surface, the highly dispersed copper oxide clusters subjected to a strong interaction with ceria, and the synergistic interactions between Cu–Ce mixed oxides and RGO.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2019
·
IF 4.914
Xuejuan Cao,Huai Liu,Junnan Wei,Xing Tang,Xianhai Zeng,Yong Sun,Tingzhou Lei,Geng Zhao,Lu Lin
The production of γ-valerolactone (GVL) from lignocellulosic biomass has become a focus of research owing to its potential applications in fuels and chemicals. In this study, ( n )CuO x -CaCO 3 (where n is the molar ratio of Cu to Ca) compounds were prepared for the first time and shown to function as efficient bifunctional catalysts for the conversion of biomass-derived methyl levulinate (ML) into GVL, using methanol as the in-situ hydrogen source. Among the catalysts with varied Cu/Ca molar ratios, (3/2)CuO x -CaCO 3 provided the highest GVL yield of 95.6% from ML. The incorporation of CaCO 3 with CuO resulted in the formation of Cu + species in a CuO x -CaCO 3 catalyst, which greatly facilitated the hydrogenation of ML. Notably, CuO x -CaCO 3 also displayed excellent catalytic performance in the methanolysis products of cellulose, even in the presence of humins. Therefore, a facile two-step strategy for the production of GVL from cellulose could be developed over this robust and inexpensive catalyst, through the integration of cellulose methanolysis catalyzed by sulfuric acid, methanol reforming, and ML hydrogenation in methanol medium.
研究领域:
化学工程
·
可再生能源
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
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2025
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IF 5.5
Dan Liu,Xujia Pan,Zebo Wu,Huibin Yin,Shimin kang,Kezi Yao,Haojie Qian,Yongjun Xu
Aqueous-phase reforming of methanol (APRM) stands out as a viable approach for providing hydrogen to polymer electrolyte fuel cells, offering advantages over traditional gas-phase methodologies conducted at relatively high temperatures. Nevertheless, the development of an effective and hydrothermally stable non-noble-metal catalyst remains a formidable challenge. This paper presents a series of resilient and efficient Cu/CuOx/C catalysts synthesized by encapsulating Cu/CuOx nanoparticles (NPs) within a carbon matrix, utilizing Cu-BTC as a precursor. The Cu-CuOx/C-700 catalyst, in particular, demonstrates a remarkable hydrogen evolution rate of 33.7 μmol·gcat−1·s−1 at 210 °C, significantly surpassing that of conventional catalysts. The exceptional stability of the Cu/CuOx/C catalysts can be ascribed to the protective carbon coating, which enhances the interaction between the Cu/CuOx NPs and the support and primarily inhibits the aggregation of copper nanoparticles under harsh aqueous reaction conditions. The reused catalysts were explored through XRD and ICP-OES analyses, which indicated that the structural integrity of the Cu-CuOx/C catalysts is largely preserved.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2017
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IF 10.614
Tingting Hou,Nengchao Luo,Hongji Li,Marc Heggen,Jianmin Lu,Yehong Wang,Feng Wang
Selective cleavage of C–C bonds is pursued as a useful chemical transformation method in biomass utilization. Herein, we report a hybrid CuOx/ceria/anatase nanotube catalyst in the selective oxidation of C–C bonds under visible light irradiation. Using the lignin β-1 model as a substrate offers 96% yields of benzaldehydes. Characterization results by high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and energy-dispersive X-ray spectroscopy element (EDX) mapping reveal that CuOx clusters are highly dispersed on the exposed anatase surface as well as on the nanosized ceria domains. In-depth investigations by Raman and ultraviolet visible diffuse reflectance spectra (UV−vis DRS), together with density functional theory (DFT) calculations, further verify that the CuOx clusters present on the ceria domains increase the concentration of surface defects (Ce3+ ions and oxygen vacancies) and accordingly improve the photocatalytic activity (Yang character); the CuOx clusters decorating on anatase suppress the side reaction (oxy-dehydrogenation without C–C bond cleavage) because of an upward shift in the valence band (VB) edge of anatase (Yin character). Mechanism investigation indicates hydrogen abstraction from β-carbon by photogenerated holes is a vital step in the conversion.
研究领域:
化学
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材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）