ACS Applied Nano Materials
·
2023
·
IF 5.9
Hua Li,Mudong Tu,Yahan Fang,Tianzhi Hao,Baodui Wang
At present, a variety of catalysts have been studied and used for the electrocatalytic reduction of nitrate. However, it is still a great challenge to improve the selectivity of the electrocatalytic nitrate reduction reaction (NO3–RR) catalyst for ammonia and reduce the activity of the competitive reaction. Herein, two-dimensional CuOx nanosheets with abundant oxygen vacancy defects were in situ grown on Cu nanoparticles to construct Cu/2D-CuOx composite nanomaterials as nitrate reduction electrocatalysts. The two-dimensional (2D) nanosheet morphology facilitated the exposure of active sites and promoted the mass/charge transfer process during electrocatalysis. As a result, the synergistic effect of abundant oxygen vacancy defects and the 2D nanosheet-like structure on the surface of the catalyst endows the Cu/2D-CuOx with superior performance for the nitrate reduction reaction, achieving high ammonia selectivity (97.56%) and NH4+ yield (1476 μg h–1 mg–1).
研究领域:
材料科学
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电化学
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催化
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环境化学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Shunfeng Li,Tingting Song,Wenting Zhou,Zenglin Wang,Yi Ma
Cocatalyst act as the active site usually plays an important role in both photocatalytic hydrogen evolution reaction (HER) and carbon dioxide reduction reaction (CO 2 RR). As the size, distribution, location, contact behavior with semiconductor etc. show significant effects for the activity. In this work, the active site environment (aggregation state of the active site of the cocatalyst) was modulated by locating the different amounts of CuO x nanoparticles (NPs) into the porous TiO 2 (CuO x @TiO 2 ), which was achieved by calcination of Cu@MIL-125 as the precursor. The composition, morphology, and chemical state of the catalyst were analyzed by a series of characterization methods. The results showed that the embedded CuO x NPs exhibited obviously better dispersion than the externally supported ones, especially at the high loading amount. Cu NPs totally transformed to CuO at the lower loading amount, while it transformed to CuO x with partial Cu (I) species existence at the higher loading amount. Photocatalytic reactions showed that the activity of CuO x @TiO 2 was ∼ twice that of the traditional outside loading catalyst CuO x /TiO 2 in both HER and CO 2 RR. The high HER activity was obtained at relatively lower loading capacity (0.200 wt%∼0.500 wt%), while CO 2 RR was the advantageous reaction at higher loading capacity (5.000∼15.000 wt%). Apparently, CuO x @TiO 2 offered a quite different active site environment for the two type of reactions. The embedded structure can provide highly dispersed single active sites for HER at lower loading capacity, while it facilitates the formation of multi-electron environment under irradiation for CO 2 RR at higher loading capacity. The construction of an appropriate active center environment determines the occurrence of high-efficiency photocatalytic reactions.
研究领域:
材料科学
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能源化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Jiancai Hou,Jiangliang Hu,Liping Chang,Jiancheng Wang,Zequan Zeng,Dongxia Wu,Xinmin Cui,Weiren Bao,Junxuan Yao
Cu-Ce mixed oxides with different Cu contents were synthesized through a sol–gel method, after which their effect on benzene combustion catalysis was evaluated. CeCu0.50 calcined at 300 °C (CeCu0.50–300) exhibited a high areal rate [2.0 × 10 −6 mol/(m 2 h)] and turnover frequency (0.16 s −1 ) at 170 °C, thus demonstrating the strong synergistic effect between CuO and CeO 2 . The catalyst durability and influence of H 2 O(g) on catalytic activity were also investigated. Correlation analyses between the catalytic activities and the amount of copper species, indicated that CuO x clusters and the Cu-[O x ]-Ce structure were the main active sites and bridge for oxygen transfer, respectively. Furthermore, benzene did not adsorb onto the copper species. The effect of temperatures on surface oxygen vacancies and oxygenated intermediates were also evaluated. Taken together, our findings provided key insights into the synergistic effects of different copper species on benzene combustion.
研究领域:
催化化学
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环境科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jin Liu,Hongyu Chen,Chaosheng Zhu,Songfang Han,Jun Li,Sijia She,Xiaoyong Wu
Advanced oxidation processes (AOPs) based on photo-Fenton reaction has been widely used in refractory organic wastewater treatment . However, the mineralization rate and H 2 O 2 utilization in AOPs is relatively low. Herein, a photothermal-assisted photocatalytic-Fenton-like process with CuO x /γ-Al 2 O 3 catalyst was designed to solve the above issues. The utilization rate of H 2 O 2 and mineralization rate of tetracycline hydrochloride (TC) in the 3%-CuO x /γ-Al 2 O 3 /H 2 O 2 /full spectrum light system were significantly increased to 72.0% and 74.3%, respectively, which were ascribed to the synergy of photothermal effect and photocatalytic-Fenton-like reaction. During the simultaneous removal of TC and Cr(VI), the reaction efficiency of 3%-CuO x /γ-Al 2 O 3 /H 2 O 2 /light system was much higher than that of 3%-CuO x /γ-Al 2 O 3 /H 2 O 2 system. In addition, the 3%-CuO x /γ-Al 2 O 3 /H 2 O 2 /light system was not only active in wider pH range (3–9), but also effective in various organic pollutants and Cr(VI) coexisted solutions as well as different water conditions. More importantly, a possible photothermal-assisted photocatalytic-Fenton-like reaction mechanism for the simultaneous removal of TC and Cr(VI) in the CuO x /γ-Al 2 O 3 /H 2 O 2 /light system was proposed. This work may pave a new way for efficient simultaneous removal of refractory organic pollutants and heavy metals in wastewater.
研究领域:
环境科学
·
废水处理
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-11
·
IF 5.479
Long Ling,Liu Xiangjian,Chen Lulu,Li Dandan,Jia Jianbo
The authors report that CuO x /NiO y hollow nanocomposites are an effective bifunctional catalyst capable of oxidizing glucose and reducing hydrogen peroxide. Synthesis is based on a solvothermal process and subsequent thermal treatment. The structure can be controlled by adjusting the amounts of added NiCl 2 during the solvothermal etching process, and core-shell, yolk-shell or hollow structures can be obtained. The porous hollow structure composite of type CuO 30 /NiO 90 was used to modify a glassy carbon electrode. It exhibits excellent electrocatalytic activity towards glucose oxidation in solution of pH 13, typically at a working potential of +0.60 V (vs. Ag/AgCl). This enables voltammetric sensing of glucose with (a) a low limit of detection (0.08 μM, at S/ N = 3), (b) over a wide linear range (0.20 μM - 2.5 mM), and (c) high sensitivity (2043 μA·mM −1 ·cm −2 ). The sensor is reproducible, selective and stable. It can be used to detect glucose in spiked human serum. The CuO 30 /NiO 90 composite also displays good electrocatalytic activity towards reduction of H 2 O 2 in neutral aqueous medium, typically at an applied potential of −0.35 V. It has a detection limit of 90 nM, a sensitivity of 271.1 μA·mM −1 ·cm −2 , and a linear detection range that extends from 0.30 μM to 9.0 mM.
CuO x /NiO y nanocomposites with three different structures were synthesized by coordinated etching precipitation method. The hollow structure CuO 30 /NiO 90 was coated on the surface of glassy carbon electrode for the amperometric determination of glucose and hydrogen peroxide.
研究领域:
生物传感技术
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材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
Functional Materials Letters
·
2018
·
IF 1.084
Zhixin Zhang,Shuqun Chen,Pingping Li,Hongyi Li,Junshu Wu,Peng Hu,Jinshu Wang
This paper reports on the fabrication of CuO x films to be used as hole transporting layer (HTL) in CH 3 NH 3 PbI 3 perovskite solar cells (PSCs). Ultra-thin CuO x coatings were grown onto FTO substrates for the first time via aerosol-assisted chemical vapor deposition (AACVD) of copper acetylacetonate in methanol. After incorporating into the PSCs prepared at ambient air, a highest power conversion efficiency (PCE) of 8.26% with HTL and of 3.34% without HTL were achieved. Our work represents an important step in the development of low-cost CVD technique for fabricating ultra-thin metal oxide functional layers in thin film photovoltaics.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Qiaoxia Zhang,Haoyuan Lyu,Ning Li,Qing Liu,Xianxi Zhang,Xiao Zhang,Xiutong Wang,Qingyun Liu
In this work, a sensitive signal-off photoelectrochemical (PEC) thrombin aptasensor with satisfying specificity is proposed, in which the evident initial photocurrent response is produced by the photoanode and the signal amplification strategy toward the target is based on the specific bio-affinity properties between thrombin and their aptamers. The photoanode was fabricated with uniform TiO 2 nanotube arrays decorated with CuO x and perylene-3,4,9,10-tetracarboxylic acid (PTCA). After the decoration of CuO x and PTCA, both possessing a strong absorption in visible region, the photocurrent response is improved greatly. Pt nanoparticles were modified on the photoanode electrode to immobilize thrombin aptamers, which could obviously improve the conductivity of the photoanode electrode owing to the excellent conductivity of Pt nanoparticles. The non-conductive complex leads to dramatical decrease in the photocurrent value due to the steric hinder effect. Based on the joint action of evident photocurrent response of photoanode and significant signal amplification strategy, the aptasensor in this project offers a wide linear range from 0.0003 nM to 10 nM, with a detection limit (3S/N) of thrombin down to 55 fM. Moreover, the as-fabricated aptasensor exhibits acceptable selectivity and stability, providing a meaningful attempt for the detection of thrombin.
研究领域:
生物传感
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分析化学
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材料科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Wei Han,Xin Ge,Jili Yuan,Ronglan Pan,Yao Yang,Guanglong Zou,Haibo Xie
Nitrate (NO 3 − ) Electroreduction to produce NH 3 offers an alternative approach to sustainable production of NH 3 . Yet it remains challenging to simultaneously improve the adsorption and enrichment of low-concentration NO 3 − . Here, bundles of CuO x microneedles on TiO 2 nanotubes (NTs) were developed by a spatial-confined electrodeposition strategy, achieving 87.7 % or 98.4 % NH 3 FE at −0.25 V or −0.45 V vs RHE in 2 or 10 mM NO 3 − electrolytes, respectively. Both in-situ spectroscopy and finite element analysis simulation demonstrated that CuO x microneedle bundles and its interface between TiO 2 NTs not only greatly improve the enrichment of low concentration NO 3 − and its derived-NO 2 − and the diffusion of NH 3 product, but also enhance the adsorption of NO 2 − and H 2 O to facilitate the hydrodeoxygenation of NO 3 − as well as inhibit hydrogen evolution reaction competition. This work will provide a promising avenue to develop electrocatalysts to realize efficient catalytic conversion of reactants at low concentrations.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Yue He,Shuang Xiao,Jiabin Zhou,Dan Liu,Zhipu Wang
A novel CuO x /Fe 2 O 3 composite catalyst was synthesized by a hydrothermal method and systematically evaluated for its peroxomonosulfate (PMS) activation capability under visible light irradiation, using tetracycline hydrochloride (TC-HCl) as the model pollutant. The results demonstrated that the CuO x /Fe 2 O 3 catalyst exhibited excellent catalytic oxidation performance, achieving 92.1 % TC-HCl degradation within 30 min through the generation of multiple reactive oxygen species (ROS) under visible light, including superoxide radicals (•O 2 − ), sulfate radicals (•SO 4 − ), hydroxyl radicals (•OH) and singlet oxygen ( 1 O 2 ). The mechanistic studies revealed that synergistic interaction between Fe and Cu bimetallic components significantly enhanced PMS activation efficiency, generating more reactive species and thereby increasing the degradation rate of TC-HCl. In addition, the CuO x /Fe 2 O 3 /PMS/vis system effectively degraded different pollutants (including Ciprofloxacin, Phenol, and Rhodamine B) and showed good tolerance to humic acid (HA) and salinity, among others. These findings highlight the practical potential of the CuO x /Fe 2 O 3 /PMS/vis oxidation system for the removal of organic pollutants in wastewater treatment field.
研究领域:
环境科学
·
催化
·
水处理技术
·
高级氧化工艺
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2014
·
IF 3.019
Wen Du,Libao Yin,Yuqun Zhuo,Qisheng Xu,Liang Zhang,Changhe Chen
Copper based sorbents are used to control mercury emissions in coal-fired flue gas . CuO x impregnated on neutral Al 2 O 3 (CuO x –Al 2 O 3 ) sorbents were found to enhance catalytic oxidation of elemental mercury in the presence of hydrogen chloride (HCl). The Hg 0 oxidation rates increased along with the increasing HCl concentration and temperature. The mercury oxidation rates were over 65% in the presence of 50 ppm HCl and the mercury adsorption amounts were over 75% in the early stage of the mercury removal process. CuO x –Al 2 O 3 sorbents demonstrated good mercury removal capacity. The effect of HCl is due to the formation of active chlorine. CuO x –Al 2 O 3 sorbents also have excellent sulfur resistance in the presence of HCl. A mixture of CuO x –Al 2 O 3 and activated carbon can remove more than 90% Hg 0 with a lower mercury removal cost for industrial applications. The characterizations of the CuO x –Al 2 O 3 sorbents were measured suggesting CuO x species work as catalysts via the redox shift between Cu 2 + and Cu + . The mercury oxidation mechanism of the sorbents is proposed to follow the Mars–Maessen mechanism.
研究领域:
环境科学
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化学工程
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能源技术
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 23
·4005-4013
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IF 3.117
Baolin Liu,Yizhao Li,Shaojun Qing,Kun Wang,Jing Xie,Yali Cao
Highly dispersed surface Cu species and oxygen vacancies are important for CuOx–CeO2 catalysts in many reactions, but it is difficult to increase the concentrations of highly dispersed Cu species and oxygen vacancies simultaneously by only adding a Cu component. Herein, CuOx–ZrO2–CeO2 (CZC) nanocatalysts with different ratios of Cu/Zr have been effectively produced by a simple solvent-free synthetic strategy. The effect of Zr doping on the structure and reactivity of the CuOx–CeO2 catalysts has been investigated with the help of carbon monoxide (CO) oxidation and 4-nitrophenol (4-NP) reduction as model reactions. It is revealed that the introduction of Zr relieved the agglomeration of surface Cu species, produced more oxygen vacancies in the interior and Cu+ species on the surface of the catalyst, and increased the reducibility of CuOx–CeO2. The CZC catalysts show remarkably enhanced catalytic activity due to the abundant surface active sites and the improved redox properties provided by the suitable doping of Zr into CuOx–CeO2. This work not only offers a practicable way to reconstruct the distribution of active metals on the metal oxide support but also provides a high-efficiency strategy to prepare oxide catalysts with excellent catalytic performance.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 11
·6405-6413
·
IF 3.119
Leitao Zhang,Lilan Huang,Lei Zhang,Binzhong Lu,Junbo Li,Yingfang Xie,Qiang Ma,Qingping Xin,Hui Ye,Lizhi Zhao,Yuzhong Zhang,Hong Li
Delicate design of hierarchical nanoarchitectures has become a highly effective strategy to develop novel adsorbents with improved adsorption capacity. Herein, hectogram-scale green fabrication of hierarchical 4A zeolite@CuOx(OH)(2−2x) (0 ≤ x < 1) nanosheet assemblies core–shell nanoarchitectures (4A-Cu-T, T was the calcination temperature) with terrific Congo red (CR) dye adsorption performance was achieved through a simple, template-free and surfactant-free hydrothermal approach. A series of characterization techniques, including scanning electron microscopy, transmission electron microscopy, X-ray diffraction and photoelectron spectroscopy demonstrated that all resultant adsorbents featured a core–shell structure with 4A zeolite as core ingredients and CuOx(OH)(2−2x) (0 ≤ x < 1) nanosheet assemblies as shell components. The adsorption experimental results pointed out that 4A-Cu-300 with a maximum adsorption capacity of 512.987 mg g−1 showed the best adsorption performance amongst all as-prepared adsorbents, and the adsorption capacity of shell component-CuOxCu(OH)(2−2x) (0 ≤ x < 1) nanosheet assemblies was calculated up to 3685.500 mg g−1. The shell thickness and phase ratio of CuO and Cu(OH)2 in CuOx(OH)(2−2x) (0 ≤ x < 1) nanosheet assemblies played key roles in improving the adsorption capacity. The successive tests suggested that the “carbon deposition” resulted in the decreased adsorption capacity of first-regenerated adsorbents, but little variance in adsorption performance among regenerated samples demonstrated the good stability of such adsorbents. This work unlocks a method for the rational design of high-performance adsorbents via delicate decoration of poor-performance materials with nanosheet assemblies, which will endow the non-active materials with enhanced adsorption properties.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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