INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Mengjie Lu,Siyu Liu,Jinyan Xiong,Wei Li
Photocatalytically splitting water to hydrogen production is a great potential for addressing the issue of energy crisis and environmental pollution. Metal-semiconductor hybrid photocatalyst has attracted increasing attention, and especially non-noble metal decoration is one of promising strategies to promote photoinduced electron-hole pairs separation for an efficient solar-to-hydrogen evolution. Herein, a facile solvothermal approach was successfully employed to prepare calcium titanate (CaTiO 3 ) nanorods with decoration of copper particles. The composition and morphology characterization showed that the Cu particle was deposited on the surface of CaTiO 3 nanorod. The as-synthesized CaTiO 3 /Cu composites exhibited promoted solar-to-hydrogen performance and their activities varied from copper loading amounts. The optimized CaTiO 3 /Cu-0.05 achieved a hydrogen evolution rate of 251 µmol g −1 h −1 , which was much higher than that of bare CaTiO 3 . Based on the photoluminescence spectra and photocurrent density measurements, it was proposed that efficient separation of photogenerated charges was achieved between the CaTiO 3 nanorod and Cu nanoparticles, which promoted water splitting for H 2 production. This work further confirms that metallic Cu decoration is an efficient approach to promote photocatalytic H 2 production performance of semiconductor photocatalysts.
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高影响因子
JOURNAL OF RARE EARTHS
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2022
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IF 4.632
Zhichao Shang,Yong Yu,Hang Yang,Zhongxiang Yang,Yang Xiao,Xiaohong Wang
The Cu/CeO 2 nanoporous composite material was prepared via a one-step and energy-saving method of solution combustion synthesis (SCS). The phase composition , surface morphology and optical characteristics of Cu/CeO 2 were studied. The results show that the SCS products are composed of cubic fluorite CeO 2 and Cu. Due to the generation and escape of gas during the synthetic reaction, the SCS CeO 2 shows porous structure, in which the mesopores (diameter 10–17 nm) nest in the wall of large pores (diameter 80–300 nm). X-ray photoelectron spectroscopy (XPS) outcomes indicate that the oxygen vacancy concentration of CeO 2 increases (18.97%–30.93%) with the increase of Cu concentration. The decoration of Cu greatly enhances the catalytic activity of CeO 2 nanomaterials . 30 wt% Cu/CeO 2 composite material shows the best photocatalytic activities for the degradation of methyl orange (MO) (95.99%), which is about 4.3 times that of CeO 2 at the same time (120 min). UV-vis diffuse reflectance spectroscopy (DRS) results show that the semiconductor band gap is reduced with the addition of metallic Cu, which leads to the enhancement of photocatalytic activity. The free radical trapping experiments demonstrate that ·O 2 – and h + are the main active species in the photocatalytic degradation of MO. Based on the above results, a hypothesized mechanism for enhanced photocatalysis of Cu/CeO 2 nanomaterials was proposed: the porous structure provides more reactive sites and channels for mass transfer, and the presence of metallic Cu improves the oxygen vacancy concentration of CeO 2 and then promotes charge-carrier separation, which helps enhance the photocatalytic performance of Cu/CeO 2 .
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 37
·17767-17775
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IF 3.925
Ji-Ping Jia,Yu-Lu Zhang,Jin-Yu Gou,Yi-Xuan Zhang,Yu-Ke Dai,Hong-Hua Ge,Yu-Zeng Zhao,Xin-Jing Meng
A Ti/SnO2–Sb–Cu–Zn electrode was prepared for the electrocatalytic oxidation of Acid Red 18 (AR18). The addition of Zn to the coating results in smaller surface cracks and greater roughness. When Cu and Zn coexist, high-index crystal planes are generated on smaller-sized grains formed on the coating surface, which allows the coating surface to adsorb oxygen. Sb5+ and the adjacent Cu2+–Zn2+ on the surface of the Cu–Zn co-doped coating are the advantageous active sites for adsorbed oxygen. The electrode exhibits a larger electrochemically active surface area and smaller electrochemical reaction resistance. The appearance of high-index crystal planes is beneficial to improve the electrocatalytic activity of the electrode, although the oxygen evolution potential of the electrode is not greatly improved. Cu–Zn co-doping produces synergistic mineralisation and enhances the ability to degrade AR18, and ˙OH is the main active species. During the thermal decomposition of the coating, Zn induces Cu to form more active sites on the high-index crystal planes of SnO2, a phenomenon that may be responsible for the synergistic production of more reactive oxygen species on the electrode surface.
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Catalysis Science & Technology
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2022
·Vol. 12
·期 20
·6155-6162
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IF 6.177
Lizi Shi,Huimin Liu,Shangbo Ning,Jinhua Ye
Photothermal catalysis is a promising strategy for converting CO2 into high value-added chemical feedstocks. Its current major challenges lie in improving CO2 conversion efficiency and product selectivity. In this work, a series of Cu/TiO2 core–shell catalysts were prepared using the hard template method. The Cu10/TiO2 catalyst exhibited excellent performance for the photothermal conversion of CO2 to CO in the presence of H2 under Xe lamp irradiation (CO2 conversion, 30.6%; CO selectivity, ∼100%; CO maximum yield, 87.1 mmol h−1 gcat−1). Results indicated that the Cu/TiO2 catalyst has a good photo-to-thermal conversion ability based on the significant LSPR effect, and the existence of hot electrons makes the reaction follow the carbonate pathway efficiently. This article successfully achieves efficient CO2 reduction under inexpensive and non-toxic conditions. In addition, it also provides unique insights into the study of the LSPR effect in the field of photothermal catalysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Pei Shen,Tiansheng Yang,Qichang Li,Zhi Chen,Yonglong Wang,Yunlei Fu,Jun Wan,Zexing Wu,Lei Wang
Developing efficient and stable catalysts for electrocatalytic hydrogen evolution reaction (HER) with low overpotential is the key point to realizing large-scale hydrogen commercialization. Herein, Ru doped amorphous hollow copper hydroxide nanowires on copper foam (Ru-Cu(OH) x /CF) is prepared by surface chemical oxidization and following solvothermal process. The hollow 3D nanowire structure can provide abundant accessibility active sites, promote electrolyte in filtration and facilitate gas diffusion in the process of the electrochemical reaction. Then, the as-synthesized Ru-Cu(OH) x /CF electrocatalyst exhibits impressive electrocatalytic performance for HER with 45, 80 and 50 mV to drive 10 mA cm −2 in 1.0 M KOH, 1.0 M phosphate-buffered saline (PBS) and 0.5 M H 2 SO 4 , respectively, with remarkable long-term stability. Moreover, sustainable energies can power the two-electrode setup with amounts of hydrogen generation. The strategy may be particularly beneficial to explore simple synthesis and high-performance catalysts for HER.
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PubMed
高影响因子
ENERGY & FUELS
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2022
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IF 4.654
Bo Zhao,Ruijie Zhu,Nan Sheng,Chunyu Zhu,Zhonghao Rao
The utilization of the paraffin phase change material (PCM) in solar energy storage systems is limited by its low thermal conductivity, easy leakage, and insensitivity to solar energy. In the present study, the solution combustion synthesis method was applied to fabricate a porous carbon matrix that is embedded with Cu nanoparticles (Cu@C). The shape-stabilized composite PCM was prepared by vacuum impregnation of liquified paraffin. The paraffin/Cu@C composite retained a high latent heat storage enthalpy of 148.2 J/g. The thermal conductivity of the composite was increased to 145% compared to that of pure paraffin. Due to the strong capillary absorption feature of the porous matrix, the composite also indicated a good anti-leakage property. Additionally, the Cu@C matrix also endowed the composite PCMs with good photo-thermal transformation capability, implying their potential application in solar thermal energy storage.
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Jingjing Tan,Jing He,Kuan Gao,Shanhui Zhu,Jinglei Cui,Long Huang,Yulei Zhu,Yongxiang Zhao
The hydrogenation of furfural to furfuryl alcohol in liquid was performed over Cu/CeO 2 catalyst with different morphology that was nanorod (CeO 2 -R), nanocube (CeO 2 -C) and nanopolyhedron (CeO 2 -P), respectively. It was observed that the Cu/CeO 2 -R catalyst exposed (1 1 0) crystal plane owns more oxygen vacancies and metal sites of Cu 0 in comparison with the catalyst of Cu/CeO 2 -P and Cu/CeO 2 -C. Meanwhile, it exhibited superior catalytic performance for furfural hydrogenation to furfuryl alcohol with a high yield of 98 % at 100 °C, 2 MPa H 2 within 4 h. The structure–activity relationship demonstrated that the catalyst intrinsic activity (TOF) is positively related to the concentration of oxygen vacancies and the metal sites of Cu 0 on its surface. DFT calculations and in-situ FTIR confirmed that Cu/CeO 2 -R (1 1 0) catalyst with more oxygen vacancy is in favor of the adsorption and activation of furfural (C O) on the catalyst surface compared with Cu/CeO 2 -P (1 1 1) and Cu/CeO 2 -C (1 0 0). Accordingly, the remarkable efficiency of Cu/CeO 2 -R catalyst can be assigned to the synergistic catalysis between the surface Cu 0 and the oxygen vacancies. Cu 0 was used to adsorb and activate H 2 , whereas the oxygen vacancies facilitate the adsorption of C O by O on the surface of the catalyst.
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RSC Advances
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2022
·Vol. 12
·期 34
·21875-21884
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IF 4.036
Ruimeng Sun,Ruijuan Lv,Yang Zhang,Ting Du,Yuhan Li,Lixia Chen,Yanfei Qi
The catalytic properties of bimetallic nanoparticles have been widely studied by researchers in many fields. In this paper, core–shell Cu/Au nanoparticles (Cu/Au NPs) were synthesized by a simple and mild one-pot method, and their peroxidase activity was proved by catalyzing the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) with color change to blue. The change of solution color and absorbance strongly depends on the concentration of H2O2, so it can be used for direct detection of H2O2 and indirect detection of glucose. What's more, GSH can efficiently react with the hydroxyl radicals from H2O2 catalyzed by core–shell Cu/Au NPs to inhibit the production of ox-TMB. Thus, the concentration of GSH can be determined by the decrease in the absorbance of the solution at 652 nm. The results showed that our proposed strategy had good detection range and detection limit for the detection of glucose and GSH. This method has been used in the detection of practical samples and has great application potential in environmental monitoring and clinical diagnosis.
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PubMed
高影响因子
RENEWABLE ENERGY
·
2022
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IF 8.634
Yunlong Yao,Zhiquan Yu,Chenyang Lu,Fanfei Sun,Yao Wang,Zhichao Sun,Yingya Liu,Anjie Wang
Copper catalysts showed excellent C O hydrogenation selectivity, but poor ability of hydrogen dissociation. Herein, a strategy to improve the activity of a Cu-based catalyst is developed by thermal treatment of Cu(OH) 2 at 100 °C with C 2 H 2 /Ar (0.5 vol%) followed by H 2 reduction at 300 °C. By means of X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS), it was revealed that Cu x C crystallites , in addition to Cu crystallites, were present in the prepared catalysts. In furfural hydrogenation at 60 °C and 1.0 MPa, the Cu x C-containing catalyst showed significantly higher activity than the Cu counterpart prepared from the same precursor by H 2 reduction at 300 °C. The introduction of ZnO improved the dispersion, and thus led to enhanced catalytic performance. The Cu x C-Cu-ZnO catalyst with Zn/Cu molar ratio of 0.5 showed considerably high hydrothermal stability in a 70-h run, with furfural conversion of >99.0% and the furfuryl alcohol selectivity of 100%.
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Nanoscale
·
2022
·Vol. 14
·期 36
·13248-13260
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IF 8.307
Xin Huang,Haitao Li,Yin Zhang,Ruifang Wu,Lijun Ban,Lin Xi,Zhifang Yin,Jian Peng,Yongxiang Zhao,Li Fang
In conventional thermocatalytic reactions under a reducing atmosphere, stabilization of the active Cu+ component and inhibition of over-reduction into metallic Cu0 are extremely challenging. In this study, Au@Cu2O core–shell nano-catalysts with different Cu2O shell thicknesses were synthesized, and the effect of the Au nano-core on Cu+ stability under a reducing atmosphere and the catalytic performance of Cu+ in the ethynylation of formaldehyde were investigated. The Au nano-core facilitates Cu2O dispersion and leads to an increase of 0.2–0.5 eV in electron binding energies of Cu2O and Cu2C2 in the range of 27–55 nm, attributed to the long-range electromagnetic effect of Au NPs. Specifically, active Cu+ centers exhibit high stability under a reducing atmosphere due to the long-range electromagnetic effect of the Au nano-core. In the ethynylation of formaldehyde as a probe reaction, Cu+/(Cu0 + Cu+) on Au@Cu2O catalysts remained at 88–91%. The catalytic performance in the ethynylation of formaldehyde revealed that the introduction of an Au nano-core into Cu-based catalysts increased the TOF from 0.37 to 0.7 h−1, and decreased the activation energy from 42.6 to 38.1 kJ mol−1. Additionally, the Cu+/(Cu0 + Cu+) ratios and the catalytic performance in the ethynylation of formaldehyde (BD yield = 65%, BD selectivity = 95%) on Au@Cu2O catalysts remained constant after nine cycles, while pure Cu2O readily deactivated due to the dramatically reduced Cu+/(Cu0 + Cu+) ratios and carbyne deposition. In summary, Cu+ in Cu-based catalysts showed high catalytic activity and stability during the ethynylation of formaldehyde due to the long-range electromagnetic effect of the Au nano-core.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 40
·19542-19554
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IF 3.925
Xiaoqing Wang,Binhe Zhao,Zimeng Xu,Haosong Chen,Tong Ye,Jing Zhang,Xinyue Zhang,Aoqi Ji,Jionghui Li,Chunhua Xiong
A series of novel resin-based MOF composites Co-MOF@D113-N (N = 1, 6) were prepared using 2-methylimidazole, cobalt acetate and D113 resin, through the layer-by-layer self-assembly method. The Co-MOF presented an amorphous form with the inducement of resin groups and the loading capacity increased with the number of self-assembled layers. The strong anchoring effect between Co and N effectively improved the thermal stability of the composites. The adsorption experiments showed that the adsorption capacity of the Co-MOF@D113-6 resin for Cu(II) increased with temperature in the range of 283–303 K. The adsorption capacity of Co-MOF@D113-6 for Cu(II) increased under the synergistic effect of MOFs and D113. The maximum adsorption capacity of Co-MOF@D113-6 was 273.88 mg g−1. The fitting results showed that the adsorption of Cu(II) by the Co-MOF@D113-6 conformed to the pseudo-second-order kinetic model dominated by chemisorption, and also conformed to the preferential Freundlich adsorption isotherm model. A low cost resin carrier combined with a high efficiency MOF composite adsorption material provided high efficiency and low consumption for promising development.
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高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 7
·7927-7947
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IF 2.843
Wang Qian,Zhu Sining,Xi Chen,Zhang Fan
A novel crosslinked hyperbranched polyamide-amines adsorbent (CHAP-SH) with sulfhydryl functional groups was synthesized by modifying thiourea and its selective adsorption properties for Cu (II) were studied. The adsorption of coexisting ions showed that the CHAP-SH had high adsorption capacity and selectivity for Cu (II). The adsorption characteristics and mechanism of the CHAP-SH for Cu (II) were systematically investigated. The results of shake flask adsorption experiments indicated that the adsorption procedure was well adapted to the Langmuir isotherm and pseudo-second-order kinetics models, and the maximum adsorption capacity of Cu (II) was 158.48 mg/g at pH = 5.0 and 45 ℃. The adsorption mechanism of the CHAP-SH for Cu (II) was mainly the synergistic interaction with –NH, –COO − , and –SH functional groups. After seven adsorption/desorption cycles, it could still maintain a high removal rate, which provided great potential for the development of multiple novel and reusable immobilized functional materials to efficiently isolate the Cu (II) ions.
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