JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 37
·期 19
·3308-3317
·
IF 2.909
Wu Meng,Li Qifei,Cheng Siling,Yao Kaitong,Liu Lin,Jiang Yu,Feng Yuezhan,Rui Xianhong,Yu Yan
Sodium-ion batteries (SIBs) are considered as potential substitute in large-scale energy storage systems due to the abundant natural resources and low price of sodium, and environmental friendliness. However, commercial graphite anode in lithium-ion batteries cannot be directly applied to SIBs. Bimetallic selenides stand out among the many anode materials owing to their rich redox chemistry and superior conductivities. Here, a bimetallic selenide Cu 3 VSe 4 is successfully prepared via one-pot reaction in oil phase, and its energy storage performance for SIBs is investigated. It delivers an impressive capacity, excellent rate performance (298 mAh g −1 at 10 A g −1 ), and outstanding long-term cycling life (305 mAh g −1 over 1000 cycles at 2.0 A g −1 ). In addition, the Na + storage mechanism (including intercalation and conversion reactions) is revealed. This work provides a new way for the application of the Cu 3 VSe 4 in SIBs. Graphical abstract A bimetallic selenide Cu 3 VSe 4 is successfully prepared via one-pot reaction in oil phase. When it is evaluated as the anode for sodium-ion batteries, the Cu 3 VSe 4 displays an impressive capacity, excellent rate performance, and outstanding long-term cycling life. In addition, the Na + storage mechanism (including intercalation and conversion reactions) is revealed.
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ACS Catalysis
·
2022
·
IF 13.7
Min Huang,Shuyi Zhang,Bo Wu,Yao Wei,Xing Yu,Yongping Gan,Tiejun Lin,Fei Yu,Fanfei Sun,Zheng Jiang,Liangshu Zhong
Direct selective methane photooxidation to liquid oxygenates with high productivity and selectivity under mild reaction conditions is highly urgent but remains challenging. Herein, a Cu and W codoped TiO2 (Cu–W–TiO2) photocatalyst was fabricated to enable aerobic oxidation of methane into oxygenates with limited formation of CO2 under ambient temperature. A high oxygenate productivity of 34.5 mmol g–1 with a remarkable selectivity of 97.1% was achieved over the Cu–W–TiO2 photocatalyst. Based on structural characterizations and mechanism studies, it was suggested that the Cu species acted as hole traps, while oxygen vacancies and the W6+-dopant state worked as electron traps. The inhibited recombination of photogenerated carriers contributed to enhanced photocatalytic efficiency. The modulated electronic and band structure promoted the activation of methane and hindered the overoxidation of oxygenates.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 9
·1-9
·
IF 6.408
Yu Ying,Huang Gengli,Luo Xueli,Lin Wanmei,Han Yong,Huang Jihong,Li Zhonghong
A dual-emission fluorescent (FL) probe was constructed by coordinating Cu 2+ of copper metal–organic frameworks (Cu-MOFs) with − COO − group of carbon dots (CDs) for pesticide thiophanate-methyl (TM) determination. TM was recognized by organic ligands (H 2 BDC and H 2 BDC-NH 2 ) of Cu-MOFs via π stacking. Due to the higher affinity of Cu 2+ to TM than ligands and CDs, TM chelated with Cu 2+ to form TM-Cu complex. Thus coordination of Cu-MOFs was damaged and the ligands were released resulting in the FL intensity increase of Cu-MOFs (F 430 ). And also CDs were released from CDs@Cu-MOFs hybrids and electron transfer from CDs to CuMOFs was inhibited, leading to the FL intensity increase of CDs (F 600 ). The FL intensity ratio (F 430 /F 600 ) showed a good linear relationship with TM concentrations of 0.0307–0.769 μmol L −1 with a limit of detection (LOD) of ~ 3.67 nmol L −1 . The probe was successfully applied to detect TM in spiked food samples with satisfactory recoveries of 93.1–113%. Additionally, visual detection of TM was achieved according to the fluorescence color variation from blue to carmine, indicating promising application of CDs@Cu-MOFs probe. Graphical abstract
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Liu Cui,Ziwei Bai,Ziqi Li,Zhaoyun Liu,Huanhuan Ma,Xiaoxu Chen,Kui Lin,Jia Hao,Yuanlu Cui,Fei Tian
Photocatalytic process using core–shell nano-catalyst is an efficient, eco-friendly, and cost-effective process for removal or minimize hazard of pollutants in waste water. Herein, a recyclable and robust Cu 2 O/Fe 3 O 4 @C/Cu core–shell nanocomposite with photocatalyst activities is designed based on the synergistic photocatalytic activities of Cu 2 O and Cu and the magnetic property and stability of Fe 3 O 4 @C. The Cu 2 O/Fe 3 O 4 @C/Cu is shown to act as nano-catalyst to almost completely convert 4-Nitrophenol (4-NP) to 4-aminophenol (4-AP) within 3 min by sufficient electrons in the electron-rich region formed under ultraviolet light irradiation. The Cu 2 O/Fe 3 O 4 @C/Cu nanocomposite shows a good stability, reusability and magnetic separation ability after five recycles. In addition, a photocatalytic mechanism of 4-NP reduction over this nanocomposite is proposed, and the roles of each nanocomponent of this nanostructure played in the synergistic enhancing photocatalytic performance via cascade reaction is demonstrated. This work suggests that Cu 2 O/Fe 3 O 4 @C/Cu nanocomposite with high activity, good stability and magnetically recyclability could be applied for the elimination of pollutants in wastewater.
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Small
·
2022
·Vol. 18
·期 23
·2201200
·
IF 15.153
Peng Jing,Peixin Liu,Minghao Hu,Xuan Xu,Baocang Liu,Jun Zhang
Electrochemical nitrogen reduction powered by renewable electricity is a promising strategy to produce ammonia. However, the lack of efficient yet cheap electrocatalysts remains the biggest challenge. Herein, hybrid Cu 2 O-CeO 2 -C nanorods are prepared on copper mesh through a metal-organic framework template route. The Cu-loaded Ce-MOF is thermally converted to Cu 2 O-CeO 2 heterojunctions with interfacial Cu-[O X ]-Ce structures embedded in carbon. Theoretical calculations reveal the lower formation energy of oxygen vacancies in Cu-[O X ]-Ce structures than in the Cu 2 O or CeO 2 phase. The Cu-[O X ]-Ce structures with oxygen vacancies enable the formation of interfacial electron-rich Cu(I) species which show significantly enhanced performance toward electrocatalytic nitrogen reduction with an NH 3 yield of 6.37 × 10 −3 µg s −1 cm −2 and a Faradaic efficiency of 18.21% in 0.10 m KOH at −0.3 V versus reversible hydrogen electrode. This work highlights the importance of modulation of charge distribution of Cu-based electrocatalysts to boost the activity toward nitrogen reduction.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Yingyu Ren,Yusen Yang,Lifang Chen,Lei Wang,Yawen Shi,Pan Yin,Wenlong Wang,Mingfei Shao,Xin Zhang,Min Wei
As a safe and environmentally friendly selective hydrogenation method, catalytic transfer hydrogenation (CTH) has aroused great interest in preparation of high-value-added products from biomass derived resources. Herein, a Cu-based catalyst (Cu/CuAl-MMO-400) was prepared by structural topological transformation of layered double hydroxides (LDHs) precursor, which displayed promising catalytic behavior toward CTH reaction of furfural (FAL) with 2-propanol (2-POL) as the hydrogen donor. Notably, the reaction rate is as high as 0.125 mol g −1 h −1 , which is superior to previously reported non-noble metal catalysts. A combination investigation based on XPS, XANES and Bader charge confirms the co-existence of Cu 0 and Cu + sites on the surface of Cu nanoparticles . Both experimental studies ( in situ DRIFTS and isotope labelling MS) and DFT calculations reveal that the Cu 0 − Cu + synergistic effect plays a vital role in determining catalytic behavior: the Cu + species acts as both dehydrogenation and hydrogenation active site; while the Cu 0 site promotes the transfer of H atoms between adsorbed substrates. This work substantiates a Cu 0 −Cu + synergetic catalysis by establishing structure-property correlation and revealing reaction pathway, which could be extended to other CTH reactions in the upgrading processes of biomass.
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Materials Today Sustainability
·
2022
·
IF 7.244
X. Tai,B. Wu,J. Bao,W. Qu,L. Zhao,Z. Wang
Rational synthesis of bimetallic electrocatalysts with the special geometric structure for direct formic acid fuel cells remains yet challenging. Herein, a facile synthetic strategy is presented to prepare the bimetallic Pd–Cu alloy nanospheres (Pd–Cu ANSs) catalysts based on the galvanic replacement and high-temperature reconstruction. The formation mechanism of Pd–Cu ANSs is studied thoroughly from comprehensive characterizations and control experiments. The optimized Pd–Cu ANSs with unique nanosphere structure as well as regulated electronic structure provide excellent electrocatalytic performance for formic acid oxidation reaction (FAOR) with a specific activity of 6.11 mA cm - 2 Pd and mass activity of 1569.48 mA mg -1 Pd , which are 2.7 times and 3.5 times as high as these of the Pd/C catalyst. This synthetic method outlined here could provide a new pathway for noble metal-based alloy nanomaterials for diverse applications.
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Journal of Materials Research and Technology-JMR&T
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2022
·
IF 6.267
Lihua Li,Shuang Liu,Meng Zhou,Yi Zhang,Shengli Liang,Jinliang Huang,Baohong Tian,Yongfeng Geng,Yijie Ban,Yong Liu,Yanlin Jia,Xu Li,Alex A. Volinsky
The effect of graphene on the thermal deformation of Cu/CeO 2 /Cr and GO-Cu/CeO 2 /Cr composites was studied. The isothermal compression test was carried out with Gleeble-1500D thermomechanical simulation device in the range of 600–900 °C and strain rate of 0.001–1 s −1 . The microstructure after deformation was characterized and analyzed by optical microscope, scanning electron microscope (SEM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). The interaction of work hardening, dynamic recovery and dynamic recrystallization was described. The constitutive equation was successfully established. The results show that Cr particles are extruded into strips, and nano CeO 2 particles nail dislocations, which inhibit dynamic recovery and dynamic recrystallization. Dispersion strengthening, twin strengthening and grain refinement strengthening occur the thermal deformation of GO-Cu/CeO 2 /Cr composites, increase the flow stress and activation energy of the composites, and inhibit the dynamic recrystallization of the composites. When the hot deformation temperature increases, the texture orientation is strengthened. GO-Cu/CeO 2 /Cr composites have typical dynamic recovery characteristics and high temperature properties.
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ChemSusChem
·
2022
·Vol. 15
·期 7
·e202200226
·
IF 9.14
Huaxin Li,Xian Yue,Jing Che,Zhou Xiao,Xianbo Yu,Fenglei Sun,Chao Xue,Junhui Xiang
Graphical Networking at its best : The 3D self-supporting nanonetwork structure of Cu−Bi aerogels provides abundant reactive sites and electron transport channels for efficient electrocatalytic reduction of CO 2 to formate. The electrocatalytic reduction of CO 2 (CO 2 RR) to CO, formate, methane, and other high-value compounds is a promising technique. However, current electrocatalysts suffer from drawbacks such as few active catalytic sites, poor selectivity and low stability, etc, which restrict the practical application. Although monatomic metal catalysts have been widely reported in recent years, high performance non-noble metal aerogels were rarely investigated for electrocatalytic CO 2 RR. Herein, Cu−Bi aerogels with boosted CO 2 RR activity were well constructed by a simple one-step self-assembly method. The resultant Cu 1 Bi 2 exhibits excellent CO 2 RR activity with high faradaic efficiency (FE) of 96.57 % towards HCOOH at a potential of −0.9 V vs. RHE, and the FE HCOOH remains over 80.18 % in a wide potential window (−0.8 V to −1.2 V vs. RHE). It demonstrated that the enhanced CO 2 RR activity of Cu−Bi aerogels could be attributed to the 3D self-supporting structure of the catalysis, synergistic effect, and low interfacial charge transfer resistance.
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Nanomaterials
·
2022
·Vol. 12
·期 5
·811
·
IF 5.719
Kang-Ping Cui,Yu-Ying He,Kai-Jie Xu,Yu Zhang,Chang-Bin Chen,Zheng-Jiang Xu,Xing Chen
In this work, the combination of high surface area diatomite with Fe and Cu bimetallic MOF material catalysts (Fe0.25Cu0.75(BDC)@DE) were synthesized by traditional solvothermal method, and exhibited efficient degradation performance to tetracycline hydrochloride (TC). The degradation results showed: Within 120 min, about 93% of TC was degraded under the optimal conditions. From the physical–chemical characterization, it can be seen that Fe and Cu play crucial roles in the reduction of Fe3+because of their synergistic effect. The synergistic effect can not only increase the generation of hydroxyl radicals (•OH), but also improve the degradation efficiency of TC. The Lewis acid property of Cu achieved the pH range of reaction system has been expanded, and it made the material degrade well under both neutral and acidic conditions. Loading into diatomite can reduce agglomeration and metal ion leaching, thus the novel catalysts exhibited low metal ion leaching. This catalyst has good structural stability, and less loss of performance after five reaction cycles, and the degradation efficiency of the material still reached 81.8%. High performance liquid chromatography–mass spectrometry was used to analyze the degradation intermediates of TC, it provided a deep insight of the mechanism and degradation pathway of TC by bimetallic MOFs. This allows us to gain a deeper understanding of the catalytic mechanism and degradation pathway of TC degradation by bimetallic MOFS catalysts. This work has not only achieved important progress in developing high-performance catalysts for TC degradation, but has also provided useful information for the development of MOF-based catalysts for rapid environmental remediation.Keywords:Fenton-like catalyst;bimetallic MOF;diatomite;synergistic effect;antibiotics
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CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Shi-Qun Cheng,Xue-Fei Weng,Qing-Nan Wang,Bai-Chuan Zhou,Wen-Cui Li,Ming-Run Li,Lei He,Dong-Qi Wang,An-Hui Lu
Copper-based heterogeneous catalysts commonly exhibit uncontrolled growth of copper species under reaction conditions because of the low Hüttig temperature (surface mobility of atoms) and Tamman temperature (bulk mobility) for copper at just 134 and 405 °C, respectively. Herein, we report the use of defect-enriched hexagonal boron nitride nanosheets (BNSs) as a support to anchor the Cu species, which resulted in superior dispersion of the Cu species. The obtained Cu/BNS catalyst was highly stable for ethanol dehydrogenation , with a high selectivity of 98% for producing acetaldehyde and an exceptionally high acetaldehyde productivity of 7.33 g AcH g cat –1 h –1 under a weight hourly space velocity of 9.6 g EtOH g cat –1 h –1 . The overall performance of our designed catalyst far exceeded that of most reported heterogeneous catalysts in terms of the stability of the Cu species and the yield of acetaldehyde in this reaction. The hydroxyl groups at the defect edges of BNS were responsible for the stabilization of the copper species, and the metal-support interaction was reinforced through charge transfer, as evidenced by coupling atomic resolution images with probe molecule infrared spectroscopy and X-ray photoelectron spectroscopy. A designed in situ diffuse reflectance infrared Fourier transform spectroscopy study of ethanol/acetaldehyde adsorption further revealed that Cu/BNS favored ethanol adsorption while suppressing acetaldehyde adsorption and further side reactions. This study demonstrates a new method for designing highly dispersed Cu-based catalysts with high durability.
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Results in Chemistry
·
2022
·
IF 0
Han Sun,Haiping Huang,Chao Hu,Yu Yan,Yongmei Hu,Shengda Guo,Jing-Lin Chen
Cu-Ni oxide nanocomposite was synthesized via solvothermal method with nickel (II) nitrate and copper nitrate as Ni and Cu resource respectively. AuNPs/oxide nanocomposite was obtained by dispersing the oxide into the pre-synthesized Au colloid. Transmission electron microscope (TEM) shows that the synthesized oxides are nanoplate morphology. Interplanar distance from the high resolution TEM (HRTEM) image shows that the Ni and Cu in the oxide are multivalent state. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) characterization further proves that the Ni and Cu are multivalent state, and the Au is Au 0 form in the nanocomposte. EDS-mapping images confirm large numbers of AuNPs are uniformly absorbed onto the ultra-thin multivalent Cu-Ni oxide nanoplate. The electrochemical properties of multivalent oxide (m-v oxide) with or without AuNPs decoration are investigated in 0.1 M potassium chloride electrolyte with 2.0 mM Ferri/Ferro-Cyanide. When employed for the electrochemical catalysis in methanol oxidation reaction (MOR), the AuNPs/m-v oxide exhibits better electrochemistry performance than m-v oxide. The current density of AuNPs/m-v oxide (21.1 mA/cm 2 ) is 3.4 times bigger than that of m-v oxide/GCE (6.2 mA/cm 2 ). What’s more, it shows good electrochemical stability and lower slope of the Tafel plot (41.87 mV/dec).
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