JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 32
·15474-15487
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IF 4.682
Liu Jiaxin,Qi Fei,Zhang Nan,Yang Jiayu,Liang Zhiyu,Tian Changqing,Zhang Wenxia,Tang Xiaosheng,Wu Daofu,Huang Qiang
Exploring novel and efficient photocatalysts to accelerate CO 2 photoreduction into useful chemicals or fuels is of great significance. In this work, we developed the three-dimensional (3D) structural heterojunction photocatalysts composed of ReS 2 and Cu 2 O by a drop-casting approach. The ReS 2 microspheres with nanosheets were deposited on the 3D structure of Cu 2 O/Cu foams. The analysis of UV–Vis absorption and PL spectra showed that the ReS 2 @Cu 2 O/Cu heterostructure delivered enhanced visible light absorption and improved charge carrier separation. The resulting ReS 2 @Cu 2 O/Cu-180 exhibited the CO yield of 14.3 µmol g −1 under the visible light irradiation. The realized S-scheme heterostructure not only promoted the separation of the photogenerated electron and hole pairs, but also enhanced the visible light absorption. Furthermore, the enriched electrons with high reducing abilities aggregated into the conduction band and diffused to the surface of Cu 2 O for favoring the CO 2 reduction and CO formation. This study is expected to provide a strategy to prepare high-performance S-scheme photocatalysts to perform efficient photocatalytic CO 2 reduction.
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JOURNAL OF PLANT GROWTH REGULATION
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2022
·Vol. 42
·期 3
·1937-1952
·
IF 4.64
Cheng Siren,Fang Zhenming,Cheng Xianchao,Wu Yizhu,Mo Lifang,Yan Chongyang,Zhou Langshan,Ren Yong
Despite copper (Cu) being an essential nutrient for the growth and development of all living organisms, the yield and tolerance mechanisms of fragrant rice under Cu-induced stress have not been reported. In this study, we tested two fragrant rice cultivars (Meixiangzhan and Yuxiangyouzhan) at the heading stage, with four Cu doses (CuSO 4 ·5H 2 O), i.e., 0 (CK), 20 (T1), 40 (T2), and 60 mM (T3) in a pot experiment. Our results showed that T2 treatment improved the yield of Meixiangzhan and Yuxiangyouzhan by 8.33% and 18.51%, respectively, by improving grains per panicle and the seed-setting rate. Moreover, Yuxiangyouzhan had the highest yield in T2 treatment, indicating that it had better Cu-tolerance than Meixiangzhan. Both cultivars had a similar response to Cu dose treatments. While T1 and T2 improved leaf pigment contents, antioxidant enzyme activities, and soluble protein content in plant tissues, T3 treatment instead promoted higher malondialdehyde (MDA) content accumulation and regulated antioxidant attributes. Overall, low-level Cu dosing significantly improved the fragrant rice yield via modulation of the antioxidant attributes. Therefore, this study provides supporting evidence for utilizing Cu reagent or assessing Cu toxicity in fragrant rice.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Ruobing Zhao,Zhuangzhuang Liu,Zhihao Zhang
In this work, copper/reduced graphene oxide (Cu/RGO) mixed powders were produced by using hydrogen-reduction (H 2 reduction) with graphene oxide (GO) and copper oxide powders as raw materials. The Cu/RGO composite was sintered through spark plasma sintering (SPS). The effects of RGO content and sintering conditions on the relative density, hardness and electrical conductivity of the composite were investigated. The results show that the GO and copper oxide powder can be reduced via H 2 reduction when sintered at 500 °C for 8 h. Moreover, as the content of RGO increases from 0 wt% to 0.67 wt%, the hardness and electrical conductivity increases firstly and then decrease. When the content of RGO is 0.33 wt%, the hardness and electrical conductivity of the composite reach the maximum, i.e., 98.6 HV and 80.5% IACS (International Annealed Copper Standard) respectively. The hardness and electrical conductivity are maximum for the composite sintered at 600 °C for 8 h. Further increase in sintering temperature lowers the properties of the composite. The Cu/RGO composites sintered at 600 °C achieved a relative density of 95.56%, with the high hardness of 193.9 HV and electrical conductivity of 89.8% IACS.
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IONICS
·
2022
·Vol. 28
·期 6
·2865-2873
·
IF 2.961
Zhi Guowei,Wang Wei,Yang Lu,Sun Luanhong,Hao Lingyun,Tang Zhengxia,Lin Qing,Yao Hanyu
Due to high theoretical capacity and low cost of CuSbS 2 , it is deemed to be one of the most promising anode materials for lithium-ion batteries (LIBs). In this paper, the effects of different Cu/Sb ratios on the properties of composites prepared by one-step microwave irradiation method were studied. The results showed the increasement of Cu element could improve conductivity of anode material and the structure stability to reduce the capacity loss. And increasing composition of Cu element also could improve the initial columbic efficiency. The best initial discharge capacity was as high as 3001.9 mA hg −1 , and even the specific capacity still kept 215.8 mA hg −1 after 120 cycles, which was got at 1:3 of Cu/Sb ratio. This work provides a method for the Cu/Sb ratio effect of the performance for the LIBs.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Haixia Wang,Yan Xu,Dafu Xu,Long Chen,Qinqin Xiao,Xiaoqing Qiu
The rapid growth of industry inevitably leads to a large variety of organic pollutants in the aquatic environment. The design of a photoelectrochemical (PEC) sensor is significant to achieve the goal of sensitive quantitative determination of organic pollutant residues. In this work, the graphitic carbon nitride (g-C3N4) quantum dots (CNQDs) with high crystallinity were synthesized through the step-by-step cutting of bulk g-C3N4, which were modified with Cu(II) and then utilized to the fabrication of a PEC sensor for monitoring the typical organic pollutant methyl viologen in water. In the detection process, by means of the redox of Cu(II)/Cu(I), Cu(II) can effectively accelerate the photogenerated carriers’ separation of CNQDs, and facilitate the reduction of methyl viologen, contributing to the notable photocurrent signal. More importantly, the stable PEC sensor presents a perfect linearity between the change in photoelectric signal and logarithm of methyl viologen concentrations ranging from 0.1 to 200 ng mL–1. Thus, the constructed Cu-CNQDs 2% can be widely utilized in the quantitative determination of methyl viologen in real monitoring of environmental pollutants.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Shijia Fan,Changjiang Zhou,Haoran Xu,Jingcai Xu,Hui-Min Wen,John Q. Xiao,Jun Hu
Giant magnetoresistance (GMR) effect exhibits high potential applications in ultrahigh density magnetic recording, magnetic sensors and electronic devices. Many methods were developed to improve the GMR, such as changing the diameters or content ratio of Co to Cu etc. In this work, we have successfully grown a new Co/Cu multilayered magnetic nanowires arrays (MNAs) with gradient diameter (GDMNAs). Very interestingly, we demonstrate much enhanced GMR in the GDMNAs. Moreover, it shows higher thermal stability simultaneously. This is a novel strategy to improve GMR. Generally, the diameter ( d ) and edge-to-edge separation ( s ) of MNAs play a significant role in determining the magnetic properties . If d < s , exchange interaction dominants. If d > s , dipolar interaction dominates. When we design a new GDMNAs with d < s at one end and d > s at the other, much better multilayered structures are observed on the larger end. Surprisingly, the magnetic anisotropy is found to be dominated by the portion of MNAs with d < s . Combining both properties in GDMNAs, we achieve the highest GMR value of 27% in reported Co/Cu MNAs. This design strategy not only reveals new interesting physics, which remains to be understood, but also useful to other applications based on MNAs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Konglu Guo,Yueyang Xu,Yan Yin,Yongping Zeng
Adsorption desulfurization can effectively remove thiophene-containing compounds in fuels. UiO-66 is a potential candidate for adsorption desulfurization due to the excellent chemical stability and resistances to acids and alkali. However, the adsorption capacity is relatively low for the big molecules of sulfide (such as thiophenes) because of the pore size in the microporous structure. We used Zn 4 O(BC) 6 as a template to synthesize a new π-complexation adsorbent (H-UiO-66-SO 3 Cu(I)) via ion-exchange and steam-induced reduction, with hierarchical porous (microporous and mesoporous) structure. The adsorbent was characterized by FT-IR, XRD , SEM , TEM and N 2 adsorption-desorption isotherms. The results show that H-UiO-66-SO 3 Cu(I) has the stable structural properties with the new mesopores . H-UiO-66-SO 3 Cu(I) has a good adsorption performance for thiophene and benzothiophene in the model fuel. The regeneration results show that H-UiO-66-SO 3 Cu(I) can be recycled four times and still has good adsorption performance.
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Processes
·
2022
·Vol. 10
·期 4
·751
·
IF 3.352
Zixuan Tang,Zehui Bai,Xin Li,Le Ding,Bin Zhang,Xinghua Chang
Cu-based bimetallic materials have been widely reported as efficient catalysts for electrocatalytic nitrate reduction. However, the faradaic efficiency and selectivity are still far from satisfactory. Herein, Cu-Fe bimetallic nanoalloys with adjustable Cu/Fe ratios are successfully prepared through a reactive mechanical milling approach with CuCl2, FeCl3and Na as the starting materials. The optimized Cu3Fe exhibits excellent nitrate conversion efficiency of 81.1% and 70.3% ammonia selectivity at −0.7 V vs. RHE within 6 h under 0.1 M Na2SO4and 100 ppm NO3−. The Fe-introduction-induced upshift of thed-band center is identified to be beneficial for promoting nitrate adsorption on Cu3Fe. Moreover, favorable H generation under the assistance of Fe could effectively accelerate the stepwise hydrogenation during electrocatalytic nitrate reduction, resulting in significantly improved NH4+selectivity. This work supplies valuable insights for the rational design of transition-metal-based bimetallic catalysts for electrocatalytic nitrate reduction.Keywords:Cu-Fe bimetallic catalysts;nitrate to ammonia;d-band center regulation
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yifan Song,Tianyu Zhang,Guangda Zhou,Peizhi Liu,Xiaoli Yan,Bingshe Xu,Junjie Guo
Earth-rich transition metal-based catalysts are considered to be the most promising candidates to alternate noble metal-based electrocatalysts for oxygen reduction reaction (ORR). Nevertheless, the practical applications have been hampered due to their poor electrocatalytic behaviors and stability. Here, we report the facial thesis of Cu nanoclusters supported on N-doped carbon nanotubes by a simple grinding and heat treatment method, which presented a superior electrocatalytic performance than commercial Pt/C. In alkaline media, an onset potential (E 0 ) and half-wave potential (E 1/2 ) of 0.98 V and 0.88 V (RHE) have been achieved, respectively. In addition, the synthesized catalysts present a good tolerance and long-term stability to methanol, and exhibit less than 7% H 2 O 2 formation. It is inferred that the enhanced electrocatalytic behavior could be attributed to the formation of Cu-N X active sites, which are coupled into the nitrogen-rich carbon nanotubes. This low-cost, extremely durable and stable electrocatalyst showed a great potential as an efficient cathode material for a variety of renewable energy conversion technologies, such as fuel cells and metal-air cells.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Li-Fang Chen,Ai-Yun Xie,Yao-Yin Lou,Na Tian,Zhi-You Zhou,Shi-Gang Sun
Here we successfully synthesized tetrahexahedral copper nanocrystals enclosed with {5 2 0} high-index facets (THH Cu{5 2 0}) by electrochemical square-wave potential method without the utilization of additional capping agents. The THH Cu{5 2 0} exhibited outstanding performance in electroreduction of nitrate to ammonia, achieving a high Faradaic efficiency of 98.3% and a yield rate of up to 9.13 mmol h −1 cm −2 at −0.90 V (vs. RHE) in neutral solution.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Fangjun Shao,Xiaojian Wang,Zijiang Zhao,Zhongzhe Wei,Xing Zhong,Zihao Yao,Shenwei Deng,Shibin Wang,Hong Wang,Aiyuan Li,Jianguo Wang
One-pot cascade transformations are environmentally friendly and are used to prepare complex organic molecules. However, chemselectivity is hard to control during the tandem reaction of imines. Herein, a Cu nanoparticle-decorated Ru cluster catalyst (Cu6Ru1.5/C-SiO2), with an average size of 2.1 nm, was designed and synthesized by impregnation and galvanic replacement. The synergistic effect of the Ru cluster and Cu nanoparticles caused Cu6Ru1.5/C-SiO2 to carry more Lewis acid active sites and constituted a unique catalyst surface. Then, the hydrogenation of nitrobenzene and reductive amination of benzaldehyde were effectively performed during a one-pot cascade transformation on the surface of the catalyst. Finally, N-benzylidene aniline (imine) was prepared smoothly by nitrobenzene and benzaldehyde with 96.3% selectivity in this catalytic system. This work provides a general and powerful strategy to optimize the catalytic performance, which can be scalable to other catalytic systems.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Pei Qiu,Yong Zhang,Gang Cheng
Solar-to-hydrogen production has attracted increasing attention since it possesses great potential in alleviating energy and environmental crises to some extent. The key issue is to develop efficient photocatalysts exhibiting superior hydrogen production capability. In this work, Cu@TiO 2 hybrid (Cu nanoparticles encapsulated in TiO 2 ) has been successfully prepared by Cu 2 O self-template reduction through solvothermal treatment in ethylene glycol-water mixed solvent. When octahedral Cu 2 O is involved in the reaction system, the Cu 2 O@Ti-precursor octahedral structure is first formed and subsequently the Cu@TiO 2 hybrid is prepared with the reduction of ethylene glycol (EG). The Cu@TiO 2 hybrid derived with different mass of Cu exhibits improved photocatalytic hydrogen production performance compare to pure TiO 2 and P25. Among those photocatalysts, the Cu@TiO 2 -10% (the copper content is 10 wt%) shows the highest hydrogen evolution rate of 4336.7 μmol g −1 h −1 , and it is twice as much as the pure TiO 2 and 1.9 times as much as P25, respectively. Based on the photo/electrochemical results, an efficient photo-generated electron-hole separation contributes to the enhancement of photocatalytic H 2 evolution upon the Cu@TiO 2 hybrid. When replacing octahedral Cu 2 O with cubic and truncated octahedrons ones, the Cu@TiO 2 hybrid photocatalysts are also obtained and they also display superior solar-to-hydrogen evolution than pure TiO 2 and P25. It is expected this work could develop an approach to design Cu-encapsulated hybrid photocatalysts for hydrogen generation .
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