FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Enkang Fu,Yu Qiu,Huaichang Lu,Sijun Wang,Lishan Liu,Hanjun Feng,Yanxin Yang,Zizhan Wu,Yunlong Xie,Feng Gong,Rui Xiao
Ammonia (NH 3 ) has been regarded as an attractive energy source for hydrogen production via catalytic decomposition , especially over non-noble metal catalysts . Owing to the decent performance and low cost, nickel (Ni) based catalysts have been widely studied for catalytic decomposition of NH 3 where the decomposition rates, can be further tailored by adding other metals. Herein, we synthesized bimetallic M(M = Co, Fe, Cu)Ni/Al 2 O 3 catalysts delivering superior catalytic performance at a wide temperature range of 350–750 °C. Co-Ni/Al 2 O 3 demonstrated nearly 100% conversion of NH 3 decomposition to H 2 at 700 °C and the gas hourly space velocity of 30,000 ml g −1 min −1 , which was ~20.85% higher than that of intrinsic Ni/Al 2 O 3 . The structural characterizations indicated that Co could decrease the particle size and enhance the dispersion of active sites. The density functional theory calculations substantiated that the associative decomposition of N to generate N 2 was the rate-determining step of the NH 3 decomposition reactions . NH 3 Temperature Programmed Desorption (TPD) results suggested that the enhanced catalytic performance was predominantly attributed to the Co that decreases the energy barrier for the associative decomposition of N to form N 2 . This study provides new insights in designing diverse catalysts for efficient NH 3 decomposition for controllable H 2 production.
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高影响因子
CATALYSIS COMMUNICATIONS
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2008
·
IF 2.394
Yunlai Ren,Zhifei Liu,Shuang Zhao,Xinzhe Tian,Jianji Wang,Weiping Yin,Shebin He
Commercially available and inexpensive ethylenediamine/Cu(OAc) 2 · H 2 O has been found to be a highly effective catalyst system for the cyanation of aryl bromides in the solvent of NMP. At the same time, the highly activated aryl chlorides with NO 2 groups gave corresponding benzonitriles in good yields. Similar to the previous observation, it is not necessary to use an excess of K 4 [Fe(CN) 6 ] in the cyanation reaction (only 20 mol% of K 4 [Fe(CN) 6 ] was used). In other hand, a more remarkable KI-accelerated effect was observed for the cyanation reaction: the addition of KI increased the yield from 6% to 91% in the cyanation of bromobenzene.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Huali Li,Shuwen Luo,Liuqin Zhang,Zilong Zhao,Min Wu,Weihua Li,Fa-Qian Liu
Marine biofouling is one of the technical bottlenecks restricting the development of the global marine economy. Among the commercial self-polishing antifouling coatings, cuprous oxide is an irreplaceable component because of its efficiency and broad-spectrum antibacterial activity. However, one of the biggest obstacles to achieving long-term antifouling is the “initial burst and final decay” of cuprous oxide in the coating. Here, we lock the copper ions by establishing an antifouling unit composed of Cu2O (core) and Cu-based metal–organic framework (Cu-MOF, shell). Cu-MOF is densely grown in situ on the periphery of Cu2O by acid proton etching. The shell structure of Cu-MOF can effectively improve the stability of the internal Cu2O and thus achieve the stable and slow release of copper ions. Furthermore, Cu2O@Cu-MOF nanocapsules can also achieve active defense by rapid and complete dissolution of Cu2O@Cu-MOF at local acidic microenvironment (pH ≤ 5) where the adhesion of fouling organisms occurs. Super-resolution fluorescence microscopy is used to explain the sterilization mechanism. Relying on the water- and acid-sensitive properties of Cu-MOF shell, the stable, controlled and efficient release of copper ions has been achieved for the Cu2O@Cu-MOF nanocapsules in the self-polishing antifouling coatings. Thus, these controlled-release nanocapsules make long-term antifouling promising.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Jilei Chen,Lu Zhang,Shulan Li,Feng-Lei Jiang,Peng Jiang,Yi Liu
Copper indium selenide (CISe) quantum dots (QDs) are a class of extremely appealing candidates for various biological applications due to their composition- and size-dependent photoluminescence and low toxicity. However, the synthesis of high-quality water-soluble CISe QDs with controlled composition in the aqueous phase is still a great challenge, which limits their biological applications. Moreover, the effects of the copper content in CISe QDs on the fluorescence and the corresponding mechanism are still subject to debate. Herein, a composition-tunable aqueous synthesis of high-quality Cu-deficient CISe QDs was presented, and the effects of the copper content on the fluorescence of CISe QDs was studied by the time-resolved fluorescence. The composition of CISe QDs could be flexibly controlled by manipulating the reaction temperature, the reaction time, and the Cu/In precursor ratio. The time-resolved fluorescence of CISe QDs with different Cu/In ratios suggested that the donor–acceptor pair (DAP) recombination was enhanced gradually with the increase of copper vacancies, resulting in the enhancement of fluorescence. However, if copper vacancies achieved an excessive concentration, the fluorescence would decrease possibly due to Auger recombination. The optimized CISe QDs with the maximum quantum yield of 10.3% were obtained with the Cu/In ratio, reaction temperature, and reaction time of 1/5, 170 °C, and 1 h, respectively. Based on the intense emission of the Cu-deficient CISe QDs, a highly sensitive “turn-on” fluorescent probe was developed for the detection of adenosine triphosphate (ATP) in living cells with a limit of detection of 56 nM. This work provides a paradigm for the aqueous-phase synthesis and applications of ternary I–III–VI QDs.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 14
·12212-12221
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IF 3.201
Yukun Sun,Dongyun Li,Hui Yang,Xingzhong Guo
Fe3O4@polydopamine@polyamidoamine (Fe3O4@PDA@PAMAM) core–shell nanocomposites were successfully fabricated through a monodispersed Fe3O4 nanoflower synthesis, PDA modification and PAMAM grafting. The as-prepared single Fe3O4@PDA@PAMAM nanocomposite possesses a high relevant saturation magnetization (Ms) (30.25 emu g−1), while the coercivity (Hc) (10.85 Oe) and retentivity (Mr) (0.9062 emu g−1) were extremely low. The obtained Fe3O4@PDA@PAMAM has an adsorption capacity as high as 97.18 mg g−1 for Cu(II), and the adsorption process is in conformity with pseudo-second-order kinetics and the Langmuir isotherm model. Moreover, the effect of pH and thermodynamics of the adsorption process is also discussed briefly.
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APPLIED SURFACE SCIENCE
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2016
·
IF 3.15
Yu Liu,Ruiqi Fu,Yue Sun,Xiaoxin Zhou,Shams Ali Baig,Xinhua Xu
In this study, EDTA-functionalized Fe 3 O 4 (Fe 3 O 4 @SiO 2 -EDTA) was prepared by silanization reaction between N-(trimethoxysilylpropyl) ethylenediamine triacetic acid (EDTA-silane) and hydroxyl groups for Pb(II) and Cu(II) removal from aqueous solutions. Fe 3 O 4 @SiO 2 -EDTA composites were characterized using SEM, TEM, EDX, FTIR, XPS, TGA and saturated magnetization techniques. Maximum Pb(II) adsorption capacity was found to be 114.94 mg g −1 with SiO 2 /EDTA molar ratio of 2.5:1. The adsorption rate was significantly fast and the equilibrium was reached within 10 min. The optimum pH was recorded to be 5.0. The maximum adsorption capacity of the studied heavy metal ions calculated by Langmuir model followed the order: Cu(II) (0.58 mmol g −1 ) > Pb(II) (0.55 mmol g −1 ) ≈ Ni(II) (0.55 mmol g −1 ) > Cd(II) (0.45 mmol g −1 ). Moreover, Pb(II) and Cu(II) adsorption capacities were not significantly affected by co-existing cations and NOM. These results suggested that this adsorbent can be considered as a promising adsorbent to remove Pb(II) and Cu(II) from wastewaters.
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FUEL
·
2025
·
IF 7.5
Zhengyang Sun,Fei Xu,Shanguang Xu,Xin Han,Shanguo Du,Jie Zhang
The selective hydrogenation of furfural (FAL) to furfuryl alcohol (FOL), catalyzed by the industrially important Cu/Al 2 O 3 catalysts, represents a significant research focus in biomass valorization. In this work, the significant promoting role of Ti modification on the performance of Cu/Al 2 O 3 for this reaction was systematically investigated using a series of Cu-xTi/Al 2 O 3 (x = 1–15 wt%) catalysts. The results revealed that at low Ti loadings (<9 wt%), Ti species were highly dispersed, formed Ti–O–Al interfacial structures with the Al 2 O 3 support, effectively increasing the number of weak acid sites and oxygen vacancies. Importantly, Ti modification optimized the metal-support interaction, enhanced the electron density of Cu species through electron transfer, significantly improved the reducibility of Cu species, and promoted the formation of metallic Cu 0 . However, excessive Ti loading (>9 wt%) led to the formation of crystalline TiO 2 particles that blocked surface active sites. The Cu-9Ti/Al 2 O 3 catalyst exhibited the best performance, achieving 100 % furfural conversion and 100 % furfuryl alcohol selectivity under reaction conditions of 85 °C, 1.0 MPa H 2 , and 4.5 h in isopropanol solvent. In situ DRIFTS experiments confirmed that the reaction followed the pathway of selective carbonyl adsorption and hydrogenation, and the formed furfuryl alcohol underwent rapid desorption, avoiding over-hydrogenation. This work elucidates the dual role of Ti modification in enhancing catalytic performance by tuning support acidity and optimizing the Cu electronic structure, providing insights for designing high-performance non-noble metal hydrogenation catalysts.
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Hao Huang,Wei Na,Xiangying Wang,Zhenhui Huang,Zhao Ai,Wengui Gao,Hua Wang
A detailed understanding of the role of Y in Cu/ZnO/ZrO 2 catalysts for methanol synthesis was studied by XRD, HRTEM, TPR, TPD, N 2 O titration and XPS techniques in this work. The addition of Y enhances the interaction between Cu and ZnO. With the increase of Y content, the crystal size of Cu and ZnO decreased and Cu 0 surface area increased, CO 2 /H 2 -TPD exhibited the larger CO 2 and H 2 desorption peak at relative high temperature, XPS confirmed the reduction degree of ZnO to Zn 0 on the catalyst surface also increased, and forming more Cu-ZnO x active sites. However, excess Y content leads to a much stronger interaction between Cu and ZnO, which is not beneficial for migration and stabilization of the formed ZnO x species during the reaction atmosphere, and thus generating less Cu-ZnO x sites for methanol synthesis. This work enlightens the migratable and metastabe of the formed ZnO x species on Cu surface by regulation of promoter and offers a perspective for exploring Cu-ZnO interactions in modified Cu/ZnO/ZrO 2 catalysts.
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Jilong Xiao,Yuxiang Li,Yuzhou Xia,Tuanyu Guo,Lu Chen,Shuying Zhu
Photocatalytic CO 2 reduction is a promising strategy for achieving carbon neutrality. Nevertheless, its efficiency is limited by the high energy barrier and severe charge recombination. Herein, Cu–WO 3 hollow sphere hybrids, in which Cu is anchored to the O defects of WO 3 , were fabricated to enable efficient photocatalytic conversion of CO 2 to CO. The oxygen defects in WO 3 promote the preferential deposition of Cu, resulting in the simultaneous exposure of Cu–O defect active sites. In the engineered Cu–WO 3 structure, the confined hollow morphology improves CO 2 adsorption and facilitates the separation of photogenerated electrons and holes. The Cu–O defect centers effectively reduce the overpotential for CO 2 conversion. Consequently, the synthesized Cu–WO 3 catalyst demonstrates excellent and stable photocatalytic CO 2 reduction activity, achieving a CO production rate of 1518 μL g –1 h –1 in the absence of a sacrificial agent, which is 5.2 times greater than that of pristine WO 3 . This study provides new insights into defect modulation for designing highly efficient photocatalytic materials.
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高影响因子
Advanced Science
·
2025
·
IF 14.1
Jiawei Gu,Qiongle Peng,Xuanqi Zhong,Yi Zheng,Zhiqiang Ma,Xiaoxian Song,Ruihuan Zhang,Bao Liu,Yanhu Zhang,Zhengbao Yang
The pursuit of multifunctional sensors has intensified due to their potential for integrated, efficient operation. However, realizing a flexible material that combines simplicity in the fabrication process with high performance and multifunctionality remains a formidable challenge. In this study, a multi-interface heterostructured nanofiber membrane composed of Polyvinylidene fluoride (PVDF), HfO 2 , and nano-copper is fabricated, leveraging the synergistic interplay of piezoelectric and piezo-phototronic effects for flexible, self-powered sensing. The incorporation of hafnium oxide (HfO 2 ) and nano-Cu enhances the crystallinity of the piezoelectric β -phase and improves the dielectric properties, substantially boosting electromechanical performance. The resultant piezoelectric sensor achieves an output voltage of 15V and maintains stability over 5000 cycles at 5 Hz, enabling precise detection of human motions. Meanwhile, the PVDF/HfO 2 -based photodetector exhibits broadband sensitivity (from near-UV to near-IR), high photoresponsivity (5.67 mA W −1 ), high detectivity (4.14×10 11 Jones), and rapid response (600 µs rising, 53 µs falling). Critically, the device demonstrates a 28.6% current enhancement under simultaneous light and pressure, highlighting a strong piezo-phototronic effect. This work presents a multifunctional fiber film for dual-mode sensing (pressure & light), with promising applications in wearable electronics and aerospace systems. Its straightforward fabrication and high performance offer a viable pathway toward next-generation, flexible, self-powered sensors.
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产品关联
DOI
PubMed
高影响因子
Journal of Central South University
·
2024
·Vol. 30
·期 12
·3881-3896
·
IF 3.7
Ma Xin,Duan Guang-yu,Huang Jia-qi,Yang Jia,Cao Zhan-fang,Wang Shuai
Heavy metal-contaminated water has become a great challenge for aquatic ecosystems. Herein, a versatile composite (IRC 748-GO) adsorbent was prepared by modifying graphene oxide (GO) with Amberlite IRC 748 resin. The batch and dynamic adsorption experiments of Cu 2+ on the IRC 748-GO composite were conducted, and the results showed that the novel adsorbents have a high adsorption capacity compared to the pristine GO. The adsorption process was consistent with the pseudo-second-order kinetic model and the equilibrium data were well fitted to the Langmuir isotherm model, and the maximum uptake of Cu 2+ was 127.22 mg/g. The adsorption mechanism was investigated using FT-IR, SEM, XPS, and adsorption isotherms, which revealed that the carboxyl groups in IRC 748-GO composite could effectively chelate Cu 2+ . Overall, the IRC 748-GO composite exhibited important advantages such as great specific surface area and stability, as well as high adsorption capacity, which provides broad application prospects for efficiently remediating wastewater containing heavy metals.
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NANOTECHNOLOGY
·
2019
·Vol. 31
·期 11
·115501
·
IF 3.399
Chenhuinan Wei,ChenXia Kang,Qiming Liu
Cu nanowire (Cu NW) and Ag nanosheet (Ag NS) bimetallic nanocomposites were fabricated on a flexible polyethylene terephthalate (PET) slice for non-enzymatic glucose sensing via a facile two-step approach, vacuum filtration, and galvanic displacement. Low-cost Cu NW-based conductive films were employed as the conductive substrates to substitute the traditional glassy carbon electrodes or indium tin oxide electrodes. The highly stable Ag NSs grow directly on the surface of Cu NWs without additional binders. The AgNO3 concentration and displacement time were adjusted to control the consumption of Cu NWs and the growth of Ag nanostructures. With the large load of Ag and the great connection of Cu NWs, a high sensitivity of 2033 μA mM−1cm−2, a fast amperometric response of 2 s, a wide linear range of 0.0015–4.02 mM, and a satisfactory result in human serum analysis were obtained by this novel Ag NS/Cu NW/PET sensor. Especially the sensitivity of the sensor was over four-fold higher than that of pure Cu NWs/PET, benefiting from the synergistic effect of bimetals. Furthermore, the Ag NS/Cu NW/PET sensor demonstrated a stable amperometric signal against mechanical bending. The material holds promise to use to fabricate flexible electrochemical devices.
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