MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Fang Wang,Fengna Shi,Jingfang Li,Naipin Chen,Cheng Chen,Ziqi Xu,Jiajun Wang
It is extremely important to simultaneously detection different biomarkers in various biological systems. Hereby, we have developed an original flexible nonenzymatic glucose and uric acid sensor using carbon cloth loaded with copper microspheres (Cu MSs) and ZnO nanoparticles decorated single-walled carbon nanotubes (Cu MSs/ZnO@CNTs/CC). Firstly, ZnO@CNTs was synthesized via sol–gel method, and then Cu MSs were uniformly electrodeposited on ZnO@CNTs/CC substrate rapidly. Morphological and compositional characteristics were examined to confirm the successful decoration of Cu microspheres and ZnO nanoparticles. Importantly, the nanocomposite electrode displayed remarkable electrocatalytic activity for glucose and UA, including wide linear detection range, low detection limit, outstanding sensitivity, respectively. Moreover, the nanostructure biosensor exhibited fast response time (0.1 s) and favorable long-term stability, which are attributed to synergistic catalytic effects: (a) the large specific surface area of CNTs offered abundant sites for the decoration of ZnO nanoparticles, and (b) the rough nanosheets assembled Cu microspheres could expose plentiful active sites. Finally, in practical serum samples, the sensor also exhibits considerably favorable precision and accuracy. As such, the novel flexible Cu MSs/ZnO@CNTs/CC sensor developed with economical and efficient preparation method provided a new easy and sensitive platform for glucose and UA determination in real application.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 46
·2305436
·
IF 19
Chenjie Han,Yeqing Lyu,Shaona Wang,Biao Liu,Yi Zhang,Jan J. Weigand,Hao Du,Jun Lu
Using ethanol electrocatalytic oxidation reaction (EOR) with a lower reaction potential to replace oxygen evolution reaction (OER) and integrating hydrogen evolution reaction (HER) have a promising development prospect for more energy-saving electrolytic hydrogen production. However, the main challenges of EOR are insufficient catalytic activity, high overpotential, and slow kinetics. Active sites on the electrocatalysts surface are occupied by alkali metal ion hydrate clusters by noncovalent interactions, which is considered to be one of the major causes of these challenges. To reduce the effect of the noncovalent interactions on the catalytic activity of the electrocatalyst, copper is chosen and doped in the form of a single atom in the electrocatalyst (Pt@Cu/C) to increase the electrocatalyst conductivity and make the anode contain more positive charge in this study. Then, alkali metal ion hydrate clusters are difficult to adsorb at the active site of Pt@Cu/C. The EOR electrocatalytic activity of Pt@Cu/C is up to 8184 mA mg Pt −1 , which is ≈4.8 times as high as that of Pt/C. The two-electrode hydrogen production device using Pt@Cu/C as anode for coupled EOR&HER requires a smaller voltage of 0.60 V to reach 10 mA cm −2 compared with that of Pt/C (0.76 V).
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Solar RRL
·
2023
·Vol. 7
·期 17
·2300318
·
IF 7.9
Bowen Liu,Xinan Shi,Wei Shao,Jiaxin Gao,Chenxi Zhao,Fuyan Chen,Dongdong Shen,Bingsuo Zou,Daocheng Pan
Cu(In,Ga)(S,Se) 2 (CIGSSe) solar cells are one of the most promising thin film photovoltaics with a record efficiency of 23.6%. However, the biggest drawback to CIGSSe solar cells is their high material cost, partially resulting from relatively rare and expensive indium and gallium. Therefore, improving the utilization of indium and gallium and reducing their wastage can greatly lower the cost of CIGSSe thin film solar cells. Inkjet printing is a facile, cost-effective, and low-waste deposition technology, which is particularly suitable for low-cost and large-area fabrication of CIGSSe solar cells. Herein, a novel and green ionic liquid-assisted ink to fabricate highly efficient CIGSSe solar cells is developed. The material utilization of inkjet printing can be remarkably improved compared to the conventional vacuum-based deposition approach and spin-coating solution approach. The CIGS printable ink is prepared by dissolving copper acetate, indium acetate, gallium nitrate, and thiourea into ethanol with the assistance of n -butylammonium butyrate ionic liquid. Ionic liquid-assisted CIGS ink has a nearly zero wetting angle and a tunable viscosity, which enable to deposit a flat and continuous CIGS thin film by an inkjet printing method. An encouraging power conversion efficiency of 15.22% has been achieved for inkjet-printed CIGSSe solar cells.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Huimin Li,Xinyuan Huang,Ye Lv,Jinli Zhang,Wei Li
The biomass electrochemical oxidation has attracted worldwide attention owning to its carbon-neutral and sustainable nature. Here, different morphologies of CoCu-carbonate hydroxides (CH) electrodes are prepared through one-step hydrothermal method for 5-hydroxymethylfurfural electrocatalytic oxidation (HMF-ECO) to high-valued 2,5-furandicarboxylic acid (FDCA) for the first time. The results illustrate that Cu can regulate CoCu–CH morphologies from 1D nanorods to 2D ultra-thin nanosheets besides modulating the catalytic compositions . The optimal Co 1 Cu 1 –CH exhibits hybrid nanostructures containing the 1D nanorods and 2D ultra-thin nanosheets , which has the largest ECSA and specific surface area, as well as the smallest Tafel slope and impedance. The oxidation potential of HMF-ECO is 1.42 V vs RHE with the conversion of HMF 99.57%, the selectivity for FDCA 99.91%, and the FE 98.88%. In addition, Cu can promote the conversion of Co 2+ to the favorable Co 3+ for HMF-ECO on the catalyst surface . Density functional theory calculation indicates that Cu can improve charges transfer to HMF and lower its adsorption energy . In situ Raman spectra tests indicate that cobalt species is the active site for HMF-ECO. Furthermore, at 1.42 V vs RHE, the coupling of HMF-ECO and hydrogen evolution reaction shows that the cathodic hydrogen evolution rate is 92.33 L h −1 m −2 , which is 3.69 times more than water splitting. This work provides a special structures material to process intensification of HMF electrooxidation coupling hydrogen production .
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Biosensors-Basel
·
2023
·Vol. 13
·期 8
·825
·
IF 5.4
Zixuan Wu,Jianxun Liu,Zhenming Wang,Lei Chen,Yiwei Xu,Zongjun Ma,Delai Kong,Dan Luo,Yan Jun Liu
We demonstrated a low-cost, highly sensitive hybrid Ag-Cu substrate with enhanced absorption for the excitation laser beam via the nanosphere lithography technique. The hybrid Ag-Cu surface-enhanced Raman spectroscopy (SERS) substrate consists of a Cu nanoarray covered with Ag nanoparticles. The geometry of the deposited Cu nanoarray is precisely determined through a self-assembly nanosphere etching process, resulting in optimized absorption for the excitation laser beam. Further Raman enhancement is achieved by incorporating plasmonic hotspots formed by dense Ag nanoparticles, grown by immersing the prepared Cu nanoarray in a silver nitrate solution. The structural design enables analytical enhancement factor of hybrid Ag-Cu SERS substrates of 1.13 × 105. The Ag-Cu SERS substrates exhibit a highly sensitive and reproducible SERS activity, with a low detection limit of 10−13M for Rhodamine 6G detection and 10−9M for 4,4′-Bipyridine. Our strategy could pave an effective and promising approach for SERS-based rapid detection in biosensors, environmental monitoring and food safety.Keywords:SERS;enhancement factor;hot spot;self-assembly;nanosphere lithography
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yangxian Ou,Tao Zhang,Li Lv,Wenxiang Tang,Shengwei Tang
CO 2 hydrogenation is one of the reactions to realize effective utilization of CO 2 , while Cu-Zn based catalyst is widely adopted for CO 2 hydrogenation to value-added chemicals like methanol. However, this process is less efficient since the poor performance of catalyst due to its poor dispersion or sintering issue. In this study, three kinds of SiO 2 supports (SBA-15, MCM-41 and Nano-SiO 2 ) with different porous structure were conducted to load same amount of 5.0 wt% Cu-ZnO active component (the molar ratio of Cu/Zn is 2.0), which were further applied for CO 2 hydrogenation. All catalysts were characterized chemically, morphologically and structurally by different techniques such as XRD , BET, TEM , H 2 -TPR and CO 2 -TPD. The results showed that the structure of three catalysts was basically preserved and the surface aera kept stable after loading active component, while the active component had the best dispersion when SBA-15 was used as the support and space-time yield of methanol is about 705.6 g MeOH •kg Cu −1 •h −1 ,which is higher than that of Nano-SiO 2 -5% (532.9 g MeOH •kg Cu −1 •h −1 ) and MCM-41–5% (213.2 g MeOH •kg Cu −1 •h −1 ). Due to the confined effect of mesoporous channel structure provided by SBA-15 support, the Cu-Zn interaction could be significantly enhanced with increasement of medium and strong alkaline sites, further improving CO 2 activation ability. This work provides a useful strategy to improve the catalytic efficiency of classical Cu-Zn catalyst for the CO 2 hydrogenation process.
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Catalysts
·
2022
·Vol. 12
·期 11
·1296
·
IF 4.501
Ruiqin Ding,Guangying Fu,Songxia Wang,Yang Yang,Qiaolin Lang,Haonuan Zhao,Xiaobo Yang,Valentin Valtchev
Narrowly dispersed ultrafine Cu clusters of sizes smaller than 2.0 nm have been encapsulated in nanosized silicalite-1 zeolite through direct crystallization in the presence of Cu(en)22+complex ions as the metal precursor. The growing silicalite-1 crystals are rich in vacancy defects and connectivity defects on the grain boundaries, where the terminating silanols promote the decomposition of Cu(en)22+, thus the deposition of ultrafine Cu species. The obtained composite material as a model catalyst is active for CO2activation and hydrogenation to methanol. The preliminary in situ FTIR study recognizes a series of surface-adsorbed carbonyl, formyl, carbonate, and formate species when the material is exposed to CO2and H2. Among others, the adsorbed formate decays most rapidly upon cofeeding CO2and H2, implying that the most probable pathway toward methanol formation over this material is via the formate-mediated mechanism.Keywords:CO2to methanol;direct crystallization of Cu@nano-zeolite;ultrafine Cu cluster;in situ FTIR;reaction intermediates
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FUEL
·
2022
·
IF 8.035
Chengyan Wen,Ke Jin,Luying Lu,Qian Jiang,Jingcheng Wu,Xiuzheng Zhuang,Xinghua Zhang,Lungang Chen,Chenguang Wang,Longlong Ma
Direct conversion of syngas into aromatics (STA) on the tandem catalyst containing Fischer-Tropsch (F-T) synthesis catalysts and acid zeolites, especially Fe-based catalysts and ZSM-5, has been attracting significant attention due to the higher cost efficiency. Even though promoters have frequently been added into the Fe-based part to improve the performance of STA reaction, its motivating mechanism is still unclear in the tandem catalyst system. Herein, the influence of the Cu promoter was evaluated for the catalytic activity of Fe-based/zeolite tandem catalysts in the STA process. Moreover, the working mechanism of the Cu promoter had been systematically investigated by adding different copper amounts and deliberately designed experiments. It was demonstrated that the addition of copper could improve aromatic selectivity because the Cu promoter could facilitate CO to participate in the conversion of olefins into aromatics over the tandem catalyst. In addition, the Cu promoter doped into the Fe-based catalyst drastically suppressed methane formation and enhanced the stability of the catalyst in the STA reaction. These findings provide insights into the effect of the Cu promoter on producing aromatics from syngas over the Fe-based/zeolite tandem catalyst system.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-13
·
IF 17.694
Yang Baiyu,Chen Ling,Xue Songlin,Sun Hao,Feng Kun,Chen Yufeng,Zhang Xiang,Xiao Long,Qin Yongze,Zhong Jun,Deng Zhao,Jiao Yan,Peng Yang
Electrocatalytic reduction of CO 2 into alcohols of high economic value offers a promising route to realize resourceful CO 2 utilization. In this study, we choose three model bicentric copper complexes based on the expanded and fluorinated porphyrin structure, but different spatial and coordination geometry, to unravel their structure-property-performance correlation in catalyzing electrochemical CO 2 reduction reactions. We show that the complexes with higher intramolecular tension and coordination asymmetry manifests a lower electrochemical stability and thus more active Cu centers, which can be reduced during electrolysis to form Cu clusters accompanied by partially-reduced or fragmented ligands. We demonstrate the hybrid structure of Cu cluster and partially reduced O-containing hexaphyrin ligand is highly potent in converting CO 2 into alcohols, up to 32.5% ethanol and 18.3% n- propanol in Faradaic efficiencies that have been rarely reported. More importantly, we uncover an interplay between the inorganic and organic phases to synergistically produce alcohols, of which the intermediates are stabilized by a confined space to afford extra O-Cu bonding. This study underlines the exploitation of structure-dependent electrochemical property to steer the CO 2 reduction pathway, as well as a potential generic tactic to target alcohol synthesis by constructing organic/inorganic Cu hybrids.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
He Zhang,Jun-Ru Liu,Guo-Hua Zhang
In this paper, excellent performance W-Cu-Ni-Fe alloys with the addition of Ni and Fe (total content: 5 wt%) were successfully prepared by low temperature liquid-phase sintering, using the raw material of ultrafine W-Cu-Ni-Fe composite powder. Ultrafine W-Cu-Ni-Fe composite powder with high sintering activity and uniform composition distribution was prepared by a two-stage reduction method consisting of carbothermal reaction and hydrogen deep deoxidation. Additions of Ni and Fe not only improved the wettability between W and Cu two phases, but also improved the bonding strength of two-phase interface. All sintered samples had higher relatively densities to ensure that the samples have great comprehensive properties. When Ni and Fe were co-added in appropriate proportions, the highest tensile strength and elongation of W-Cu-Ni-Fe alloy samples were 497 MPa and 9.12 % for the composition: W-3.5 wt%Ni-1.5 wt%Fe-25 wt%Cu, respectively. Meanwhile, with increasing Ni content from 0 wt% to 5 wt%, the compressive strength and failure strain of alloy samples increased from 1160 MPa to 2376 MPa and from 53 % to 98 %, respectively. In addition, with the enhancement of the solid solution strengthening effects of Ni and Fe on Cu matrix, the bending strength and microhardness of the alloy samples increased to 1174 MPa and 361 HV for composition: W-3.5 wt%Ni-1.5 wt%Fe-25 wt%Cu, respectively. Although the additions of Ni and Fe made the Cu matrix network structure have a uniform distribution, it led to a decrease in the electron transfer ability of the alloy, and thus, there was a decrease in electrical conductivity .
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shanshan Qiao,Yuqing Chen,Yanhong Tang,Jili Yuan,Jiachao Shen,Danyu Zhang,Yi Du,Ziru Li,Dingwang Yuan,Haifang Tang,Chengbin Liu
Cu 2 O is promising to catalytically convert CO 2 into C 2 products by overcoming the instability and slow multi-electron transfer. Regulating catalytic construction and interface microenvironment is challenging to stabilize Cu 2 O and selectively convert CO 2 to C 2+ hydrocarbons. A photocatalyst (Cu 2 O@Cu-CN) of oxygen vacancy–rich Cu 2 O@Cu symbiont embedded in N -doped carbon skeleton is achieved by ligand competition strategy. The Schottky junction and the hydrophobic microenvironment in the catalyst together stabilize the active site against the Cu 2 O redox reaction. The hydrophobic interface can make the catalyst favorable for trapping CO 2 . The asymmetric interface with oxygen vacancy can enhance the adsorption and activation of CO 2 and *CO, thus reducing the energy barrier for the formation of *OCCO intermediates and promoting the coupling conversion of *OCCO to C 2 H 4 . The C 2 H 4 evolution rate reaches 46.27 μmol C2H4 g cat -1 h −1 with a high selectivity of 40.3 % using triethanolamine (TEOA) as a sacrificial agent, and the apparent quantum yield (AQY) is as high as 14.41 % (λ = 420 nm). The C 2 H 4 evolution rate is 2.10 μmol C2H4 g cat -1 h −1 in water without TEOA. Moreover, the productive rate of C 2 H 4 still maintains 95.37 % after lasting 20 h, showing a robust long − term stability.
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Nanoscale
·
2022
·Vol. 14
·期 48
·17976-17984
·
IF 8.307
Jie Bai,Nana Lei,Limin Wang,Yaqiong Gong
The electrocatalytic oxygen evolution reaction (OER) is an integral part and a stepping stone to various electrochemical technologies in the field of electrochemical energy conversion. The development of OER catalysts with low-cost materials, industry-related activity and long-term durability is highly needed, but remains challenging at this stage. In this paper, Cu ions in a copper foam (CF) substrate were replaced with Cu(OH)2 grown on CF to participate in the subsequent reaction, and then a subsequent two-step hydrothermal method was used to obtain the nanoflower-like Cu–Co–Zn trimetallic sulfide (named CuCoZn–S-3) catalyst, whose unique flower structure ensures that the catalyst surface exhibits a larger electrochemical active area, so as to expose plentiful active sites. The synergism between metals regulates the electron environment and accelerates the charge transfer rate, greatly improving the electrocatalytic activity of the catalyst. The prepared CuCoZn–S-3 exhibits excellent OER performance under alkaline conditions. It requires overpotentials of only 175 mV and 242 mV to drive current densities of 10 mA cm−2 and 100 mA cm−2, respectively. The Tafel slope of CuCoZn–S-3 is 62.3 mV dec−1. This study may provide a viable strategy for the rational preparation of low-cost and efficient OER electrocatalysts in alkaline medium.
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