ELECTROCHIMICA ACTA
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2012
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IF 3.832
Lu Xiong,Yu-Xi Huang,Xian-Wei Liu,Guo-Ping Sheng,Wen-Wei Li,Han-Qing Yu
Efficient, cost-effective and stable catalysts for cathodic oxygen reduction reaction (ORR) are highly desirable for both chemical and microbial fuel cells. Nano-materials with three-dimensional (3D) porous materials are gaining popularity recently, because of their large surface areas and numerous active sites. In this work, we prepare a unique self-supporting Pd–Cu bimetallic catalyst with 3D porous structure using a facile double-template fabrication process and evaluate its performance as an ORR catalyst. This catalyst is found to possess an electrochemically active surface area of 80.2 m 2 /g Pd , a peak current of 17.4 mA/cm 2 and an unusual limiting current density of 12 mA/cm 2 . Meanwhile, the fabricated bimetallic catalyst displays a better long-term stability than the state-of-the-art Pt/C catalyst. This work provides useful information on the facile preparation of cost-effective cathodic catalysts for chemical or microbial fuel cells in a controllable way.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 1
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IF 1.768
Caideng Yuan,Mingtong Cui,Longlong Feng,Jingpeng Wang,Yan Peng
An amino-functionalized nano-adsorbent (DETA-MNPs) was prepared by a process involving: (1) synthesis of superparamagnetic Fe 3 O 4 nanoparticles; (2) introduction of amino groups after which ATRP initiator was anchored; (3) grafting of glycidyl methacrylate (GMA) via SI-ATRP; and (4) ring-opening reaction of epoxy groups with diethylenetriamine (DETA). The nano-adsorbent was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM) and applied to remove Cu(II) in batch experiments. The effects of pH, Cu(II) concentrations, solution ionic strength, and contact time were investigated. The results show that the DETA-MNPs are spherical with cubic spine structure, high saturation magnetization (41.9 emu g −1 ), and an average diameter of 10 nm. The maximum Cu(II) adsorption capacity achieves 83.33 mg g −1 at pH 5.0 by Langmuir model. The adsorption process is highly pH-dependent and reaches equilibrium within 20 min. Furthermore, the DETA-MNPs exhibit excellent dispersibility and reusability. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 132 , 42859.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2014
·Vol. 162
·期 1
·B36
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IF 2.859
Jinshou Wang,Zhen Shi,Jing Jin,Yuanbin Tan,Shenghui Zhang
A novel ordered macroporous polycysteine/Cu composite film (DOM PCE/Cu) was successfully prepared by electrochemical deposition method using polystyrene spheres as templates on a bare glassy carbon electrode (GCE). The structure and electrochemical properties of DOM PCE/Cu film were characterized. The DOM PCE/Cu composite film modified electrode exhibits good electrochemical catalytic activity toward the oxidation of glucose, which may be related to the structure of DOM PCE/Cu film. The non-enzymatic glucose sensor has a wide linear range from 2 μM to 2.9 mM, with a low detection limit of 0.8 μM. The modified electrode also has highly sensitive and fast amperometric (within 3 s) sensing of glucose, thus it can be used for the future development of non-enzymatic glucose sensor.
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CARBOHYDRATE POLYMERS
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2017
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IF 4.811
Shidong Dai,Nana Prempeh,Dagang Liu,Yimin Fan,Mingyue Gu,Yu Chang
With the increasing demand of environmental monitoring for toxic and odorous ammonia gas it is desired to develop specific green, cost-effective and in situ passive colorimetric alternatives to current complex instrumentations. In this work, we designed an ammonia gas sensor based on cholesteric liquid crystal films of copper(II)-doped cellulose nanocrystals (CNC Cu(II)) whose structure, optical and sensing properties were investigated. The hybrid films using the low doping Cu(II) as a color-tuning agent inherited the chiral nematic signature and optical activity of CNCs, suggesting a strong chelation between copper ions and negatively charged CNCs. The sensing performance illustrates that the CNC Cu(II)125 film was sensitive to ammonia gas which could merge into nematic layers of CNCs and trigger-sensed to copper ions chelated on CNCs, consequently arousing a red-shift of reflective wavelength as well as an effective colorimetric transition. Such a hybrid film is anticipated to boost a new gas sensing regime for fast and effective on-site qualitative investigations.
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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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2017
·Vol. 48
·期 5
·2535-2542
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IF 1.642
Zhang Zhong-Lin,Zhou Lin-Zong,Ji De-Bin,Yan Yong-De,Hong Wei,Liu Yu-Hui,Wang Pu,Yin Tai-Qi,Zheng Jia-Ning,Xue Yun,Ye Yuan-Feng
Electrochemical behavior of Nd was studied in NaCl-KCl melt on W and Cu electrodes via cyclic voltammetry and chronopotentiometry. Generally, the reduction of Nd 3+ takes place in two consecutive steps in molten chlorides, such as LiCl-CaCl 2 , LiCl-BaCl 2 , CaCl 2 -NaCl, LiCl-KCl melts. However, the reduction of Nd 3+ ions was found to be through a one-step process: Nd 3+ + 3e − → Nd. The co-reduction behavior of Nd 3+ and Cu 2+ ions and the mechanisms of alloy formation were investigated in NaCl-KCl melt on W electrodes at 988 K (715 °C). Four potential plateaus corresponding to four different kinds of Cu-Nd intermetallic compounds were detected. Cu-Nd alloys were prepared on Cu electrodes at 988 K (715 °C) and 1143 K (870 °C). At 988 K (715 °C), Cu 5 Nd phase was identified by X-ray diffraction. The morphology and micro-zone chemical analysis of the alloys were characterized by scanning electron microscopy equipped with energy-dispersive spectrometry. The alloy film was observed on the Cu electrodes. Moreover, at 1143 K (870 °C), a globate bulk Cu-Nd alloy with Cu 5 Nd, Cu 4 Nd, Cu 2 Nd, CuNd, and Cu phases, as liquid in the melt, was obtained at the bottom of the crucible.
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Scientific Reports
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2017
·Vol. 7
·期 1
·1-13
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IF 4.259
Wang Xiaoxia,Zhang Baoqin,Zhang Wei,Yu Mingxun,Cui Liang,Cao Xueying,Liu Jingquan
Graphene oxide (GO) was rarely used as microwave absorption (MA) material due to its lower dielectric loss compared with reduced GO (RGO). However, the characteristics of low conductivity, light weight, and large surface area were beneficial to the impedance matching for absorbers already containing highly conductive metal materials. Cu@Ni nanowires are promising MA materials due to the desired dielectric loss from copper and excellent magnetic loss from nickel. However, the high density was an impediment to its further application. Combining Cu@Ni nanowires with GO should be an effective solution to decrease the absorber’s density and improve its MA properties. Herein, we demonstrated that Cu@Ni nanowires/GO composites exhibited enhanced MA capacities compared with Cu@Ni nanowires or GO alone, and the minimum reflection loss reached −42.8 dB at 16.9 GHz with a thickness of 2.1 mm. The enhanced MA performance mainly originated from good impedance matching, as a result of the addition of low conductivity of GO. To confirm this point, the MA performance of Cu@Ni nanowires/RGO was studied, and unsurprisingly, weak MA performance was obtained. Our work provides a new strategy to decrease the density, broaden the frequency band and tune MA performance of composites.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
YiRong Yao,Bing Xing,Jianbing Chen,YanLun Ren,YuJia Ma,Ying Zhang,Li Zhang
This study proposes an advanced method to tackle CO 2 emissions by enhancing solid acid catalysts, aiming to reduce the high energy consumption and low economic efficiency typically associated with chemical absorption processes. The research involves modifying commercial HZSM-5 zeolites through Cu ion exchange, with the optimal performance observed at a Cu ion content of 2.86 % and a Cu salt concentration of 0.2 M. This modification significantly minimizes the loss of copper ions—a common issue in the impregnation method—resulting in a 76.62 % reduction in the loss of active components. To further improve CO 2 gas-liquid mass transfer, mesoporous MCM-41 zeolites were introduced. Experimental results demonstrate that, at a regeneration temperature of 86°C and a mass ratio of 2:1 for HZSM-5 to MCM-41, the combined catalyst achieves a 61.28 % reduction in relative heat duty compared to the blank sample. Moreover, the energy consumption is 12.33 % and 16.45 % lower than that of HZSM-5 and MCM-41 used individually. Characterization analysis reveals that, under comparable acidic active site densities, catalysts with superior physical pore structures exhibit enhanced catalytic performance. The introduction of mesoporous structures notably improves the bidirectional mass transfer efficiency between carbamate macromolecules and CO 2 molecules. This work successfully demonstrates the synergistic effect of combining Cu ion-modified HZSM-5 zeolites with mesoporous MCM-41, leveraging the abundant active sites of HZSM-5 while harnessing the enhanced mass transfer properties of MCM-41.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Ganghua Zhou,Yun Chen,Gaoran Chen,Hangmin Xu,Weiqin Yin,Bin Wang,Xingwang Zhu,Xin Ning,Paul K. Chu,Xiaozhi Wang,Hui Xu
Metal-organic frameworks (MOFs) with abundant pores are excellent adsorbents for metal ions. However, the subsequent treatment of used MOFs and their reutilization still lack promising solutions. Herein, the surface-restructured Mn-doped Cu 2 O (RM-Cu 2 O) catalyst containing asymmetric Mn−Cu sites is prepared by glucose reduction using the spent Cu-based MOF (HKUST-1) as the precursor. The RM-Cu 2 O catalyst shows good potential in tunable photocatalytic syngas (CO and H 2 ) production in a pure water system. The syngas ratios can be tuned from ∼1:2 to ∼1:1 by increasing CO production. DFT calculations and photoelectrochemical tests confirm that the asymmetric Mn−Cu sites on the RM-Cu 2 O catalyst accelerate the photogenerated charge transport and optimize CO 2 adsorption and activation. In situ irradiation X-ray photoelectron spectroscopy is conducted to investigate the dynamic charge transport and reactions on the RM-Cu 2 O catalyst. Based on in situ Fourier transform infrared spectroscopy and simulations, the mechanism of photocatalytic syngas production is elucidated. This work provides a promising solution for the resource utilization of the spent MOFs-based adsorbents and photocatalytic energy development.
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ACS Nanoscience Au
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2024
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IF 4.8
Dan Luo,Zhiheng Xie,Shuangqun Chen,Tianyi Yang,Yalin Guo,Ying Liu,Zhouhao Zhu,Liyong Gan,Lingmei Liu,Jianfeng Huang
Electrochemical semihydrogenation (ESH) of alkynes to alkenes is an appealing technique for producing pharmaceutical precursors and polymer monomers, while also preventing catalyst poisoning by alkyne impurities. Cu is recognized as a cost-effective and highly selective catalyst for ESH, whereas its activity is somewhat limited. Here, from a mechanistic standpoint, we hypothesize that electron-deficient Cu can enhance ESH activity by promoting the rate-determining step of alkene desorption. We test this hypothesis by utilizing Cu–Ag hybrids as electrocatalysts, developed through a welding process of Ag nanoparticles with Cu nanowires. Our findings reveal that these rationally engineered Cu–Ag hybrids exhibit a notable enhancement (2–4 times greater) in alkyne conversion rates compared to isolated Ag NPs or Cu NWs, while maintaining over 99% selectivity for alkene products. Through a combination of operando and computational studies, we verify that the electron-depleted Cu sites, resulting from electron transfer between Ag nanoparticles and Cu nanowires, effectively weaken the adsorption of alkenes, thereby substantially boosting ESH activity. This work not only provides mechanistic insights into ESH but also stimulates compelling strategies involving hybridizing distinct metals to optimize ESH activity.
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ENERGY & FUELS
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2024
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IF 5.2
Yongjin Wang,Zhipeng Zhou,Xiaoxia Zhang,Junjie Liao,Jiancheng Wang,Weiren Bao,Liping Chang
The preparation of a Cu-based sorbent supported by cost-effective AlOOH is proposed. A Cu-based sorbent for thiophene removal from coke oven gas was synthesized via coprecipitation, and the effect of AlOOH addition on the dispersion of activated Cu species and desulfurization properties was investigated. At an AlOOH content of 25%, smaller and more highly dispersed Cu grains, along with ZnO crystalline phases, were present on the surface of the Cu-based sorbent. The enhanced Cu-ZnO interaction contributed to the superior desulfurization performance (Qb-thiophene = 30.43 mg/g). The incorporation of an appropriate amount of AlOOH into the binary system during synthesis produces a highly active sorbent with superior Cu dispersion and smaller Cu grains, thereby fulfilling the requirements of industrial applications at a lower production cost.
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ACS Sustainable Chemistry & Engineering
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2024
·
IF 7.1
Zhibin Zhang,Lei Wang,Xixian Yang,Mengyuan Chu,Liyun Huang,Jiayi Fan,Wucheng Xie,Defei Liu,Wenbing Yuan,Yue Situ
The electroreduction of CO2 to formate is of significant interest due to its potential for sustainable fuel and chemical production. Hollow fiber electrodes, which integrate gas diffusion and catalytic layers, offer structural advantages. These advantages enhance gas–solid–liquid-phase reactions, making them particularly beneficial for CO2 electroreduction. This work reports a copper–bismuth alloy hollow fiber with a nanostructured surface, designed with specific metal ratios and transformed into a sulfur surface-modified copper–bismuth alloy hollow fiber (Cu7S4–CuBi HF) electrode with nanoflower structures. CO2-penetration mode enhances formate current density and Faradaic Efficiency (FE) while suppressing the hydrogen evolution reaction (HER), due to the fiber’s unique gas transport. The nanoflower morphology increases the electrochemical active surface area, boosting current densities. This design achieved a formate FE of 91.27% at −0.9 V vs RHE and a current density of 80.12 mA cm–2, outperforming many existing Cu@Bi electrocatalysts. This success is due to the innovative surface design and the distinct structural features of the hollow fiber electrodes.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
·
IF 1.5
Zhou Lu-Wei,Chen Kai-Wei,Dai Xiao-Jun,Qiao Tai-Fei,Liu Hong-Yu,Lu Ji-Gen,Wang Peng,Gong Chun-Hui,Deng Shao-Gang,Xia Ming,Ni Fei,Tang Guo-Min,Zhang Yong-Bing,Yang Yi
Cu/Cu 2 O-modified activated carbon composites (Cu/Cu 2 O@AC) were synthesized via an one-step solvothermal method. The characterization results indicated that copper was uniformly dispersed on the surface of AC as nano-sized Cu 0 and Cu(I), which allowed Cu/Cu 2 O to make full contact with I − . The high specific surface area of Cu/Cu 2 O@AC and the affinity of Cu + for I − led to the equilibrium adsorption capacity within forty minutes. Additionally, the removal of trace I − (300 μg L −1 ) at pH = 3 by Cu/Cu 2 O@AC reached 96.4%. This work provides a promising application for the inexpensive and efficient capture of trace iodine from medical wastewater. Graphical abstract We synthesized Cu/Cu 2 O@AC composites for adsorption of iodide ions in solution.
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