Science China-Chemistry
·
2025
·
IF 9.7
Li Ran,Yin Hang,Jing Wen-Kai,Cheng Jia-Lin,Qin Xue-Rong,Lu Tong-Bu,Wang Hong-Juan,Yu Zi-You
As important catalysts for C–C coupling, copper-based materials have great potential for electrocatalytic reduction of CO 2 to C 2+ products. In this work, Cu 2 O catalysts modified with different lanthanide hydroxides were successfully synthesized and used for CO 2 electroreduction. The results showed that compared with Cu 2 O/Gd(OH) 3 and Cu 2 O/Yb(OH) 3 catalysts, Cu 2 O/La(OH) 3 exhibited the highest electrocatalytic performance for CO 2 reduction. This catalyst was able to maintain a high Faraday efficiency for C 2+ products ( \({\rm FE}_{{\rm C}_{2+}}\) ) of about 60% within the current density range of 400–800 mA cm −2 . The highest \({\rm FE}_{{\rm C}_{2+}}\) reached 66% at 600 mA cm −2 and the partial current density for C 2+ products reached a maximum of 488 mA cm −2 . Meanwhile, the catalyst could run stably for 40 h with a remained \({\rm FE}_{{\rm C}_{2+}}\) of about 60%. Multiple characterizations reveal that the introduction of La(OH) 3 promotes the formation of *CO intermediates, and also helps to stabilize the Cu(I) species in Cu 2 O under cathodic potentials, thus facilitating the C–C coupling for C 2+ production. This work provides a new strategy to enhance the C 2+ production via stabilizing Cu(I).
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Materials
·
2025
·Vol. 18
·期 11
·2495
·
IF 3.2
Haosheng Lan,Yi Zhang,Le Ding,Xin Li,Zhanhong Zhao,Yansen Qu,Yingjie Xia,Xinghua Chang
Electrocatalytic nitrate reduction to ammonia (ENRA) presents a promising strategy for simultaneous environmental remediation and sustainable ammonia synthesis. In this work, a Cu–Co bimetallic catalyst supported on functionalized reduced graphene oxide (RGO) was systematically designed to achieve efficient and selective ammonia production. Surface oxygen functional groups on graphene oxide (GO) were optimized through alkaline hydrothermal treatments, enhancing the anchoring capacity for metal active sites. Characterization indicated the successful formation of uniform Cu–Co bimetallic heterointerfaces comprising metallic and oxide phases, which significantly improved catalyst stability and performance. Among the studied compositions, Cu6Co4/RGO exhibited superior catalytic activity, achieving a remarkable ammonia selectivity of 99.86% and a Faradaic efficiency of 96.54% at −0.6 V (vs. RHE). Long-term electrocatalysis demonstrated excellent durability, with over 90% Faradaic efficiency maintained for ammonia production after 20 h of operation. In situ FTIR analysis revealed that introducing Co effectively promoted water dissociation, facilitating hydrogen generation (*H) and accelerating the transformation of nitrate intermediates. This work offers valuable mechanistic insights and paves the way for the design of highly efficient bimetallic electrocatalysts for nitrate reduction and ammonia electrosynthesis.
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PubMed
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2025
·Vol. 31
·期 2
·65-73
·
IF 8.5
Dong Shengbin,Liu Qi,Gu Haoyuan,Wu Haoran,He Jing,Li Didi,Zhu Minghui
Carbon monoxide (CO) oxidation is crucial for pollutant removal and hydrogen purification. In recent years, copper–cerium (Cu–Ce)-mixed oxide catalysts have attracted significant attention due to their excellent activity and stability in CO oxidation. This study presents an innovative, environmentally friendly electrosynthesis method for producing stable, structured Cu–Ce catalysts in mesh form. This approach addresses the limitations of traditional pellet catalysts, such as fragility and poor thermal conductivity. The results demonstrated that incorporating cerium (Ce) enhanced the catalytic activity for CO oxidation threefold. A series of in situ characterizations revealed that the introduction of Ce led to the formation of a Cu–Ce mixed oxide solid solution, which significantly improved catalytic performance. Furthermore, higher pretreatment temperatures facilitated the decomposition of Ce compounds (nitrate and hydroxide), which promotes the formation of Cu–Ce solid solutions and increases the concentration of active intermediate species (Cu + ‒CO) during the reaction. This process ultimately enhanced the catalyst’s activity.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Sajid Ali,Xingwen Cha,Jinxin He,Muhammad Ubaid Ali,Muhammad Junaid Aslam,Songbo Chen,Kok Bing Tan,Guowu Zhan
Tunable electronic properties of supported Cu/CeO2 catalysts are critical for improving the active site activity in catalysis. In this contribution, we propose a surface engineering protocol that utilizes unique ascorbic acid (AA) properties to generate surface defects and modify the electronic properties of Cu–Ce catalysts. This approach relies on forming abundant (Ce3+-Ov) defective sites on the CeO2 surface synthesized with a Ce-benzene-tricarboxylate metal–organic framework (MOF) as a precursor through AA adsorption. Subsequently, Cu sites can be effectively anchored onto the generated Ce3+-Ov, exhibiting excellent electronic transfer between (Ce3+-Ov/Ce4+ ↔ Cu2+/Cu+) CuCe, resulting in highly active Cu+ with well-balanced Ce3+-Ov defects. A high fraction of Cu+ with Ce3+-Ov was dedicated to the presence of AA. The resultant Cu/AA-MOF-CeO2 catalyst demonstrated outstanding performance toward CO oxidation (90–95 °C), being far superior to that of the conventionally prepared Cu/MOF-CeO2 catalyst (110–115 °C). In-depth characterizations confirmed that the remarkable performance was considerably related to the enhanced Cu–Ce interaction, enriched Cu+ active sites, and balanced Ce3+-Ov defects. This work highlights the potential of the Cu/AA-MOF-CeO2 catalyst as a sustainable solution for low-temperature catalytic CO oxidation reaction.
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高影响因子
FUEL
·
2025
·
IF 7.5
Xiaomei Qin,Chengchao Liu,Xiaoyun Qin,Jianbo Zhao,Huishi Guo,Yanghai Gui,Jingfei Xiao,Zhen Zhang
In this study, activated biochar (ABC) sourced from solid biowaste was prepared using wheat straw as the carbon source. The ABC was then used as a carrier for the in-situ growth of Cu-MOF-74, which was subsequently pyrolyzed at high temperatures to prepare Cu-MOF derivative-modified porous biochar composites Cu/ABC-T (T = 700–1000 °C) with a uniform distribution of Cu species on the biochar surface. The effect of pyrolysis temperature on the as-prepared Cu/ABC was investigated. The experimental results showed that Cu/ABC-900 exhibited the optimal adsorption performance for DBT, confirming that the uniform distribution of Cu on the biomass carbon surface after high-temperature pyrolysis effectively enhanced the desulfurization performance. Specifically, the as-prepared Cu/ABC-900 achieved an adsorption efficiency of nearly 90 % for 1000 ppm DBT, with an adsorption equilibrium time of only 5 min and a maximum adsorption capacity of 19.70 mg S·g −1 . The adsorption process of DBT by Cu/ABC followed the pseudo-second-order kinetic model and Langmuir adsorption model. The adsorption performance of Cu/ABC-900 for different sulfides followed the order: DBT > BT > TH. Furthermore, the adsorption efficiency of Cu/ABC-900 for DBT did not exhibit any significant decline after five regeneration cycles, indicating the excellent regenerability and great potential for practical applications. This work provides a new approach to utilizing carbon-based adsorbents for deep desulfurization, which is beneficial for cost-effective fuel cleaning.
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NANOTECHNOLOGY
·
2018
·Vol. 29
·期 13
·135502
·
IF 3.404
Xiufeng Wu,Wenbo Lu
It is highly attractive to construct stable enzyme-free glucose sensors based on three-dimensional direct electrochemical detection of glucose. In this paper, a copper 7,7,8,8-tetracyanoquinodimethane (Cu(TCNQ)) nanorod array on Cu foam (Cu(TCNQ) NA/CF) is proposed as an efficient catalyst for electrochemical glucose oxidation in alkaline conditions. When Cu(TCNQ) NA/CF was used as the enzyme-free sensory of glucose, the sensor showed a response time within 3 s, a wide linear detection in the range 0.001–10.0 mM, the minimum limit of detection was as low as 10 nM (S/N = 3), and it had a high sensitivity of 26 987 μA mM−1 cm−2. Moreover, this sensor also possesses long-term stability, high selectivity, reproducibility, and actual applications for fresh human serum sample analysis is also successfully accepted.
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COLLOID AND POLYMER SCIENCE
·
2012
·Vol. 290
·期 13
·1327-1331
·
IF 2.331
Wu Tianxing,Sun Fengqiang,Chen Wei,Zhu Zhimin,Min Zhilin,Li Weishan
Taking the poly(styrene-co-acrylamide) (P(St-AM)) as a model material, a novel two-step photochemical method was introduced to construct nanoporous polymer microspheres at room temperature. Under ultraviolet light irradiation, suspensions composed of Cu/Cu 2 O nanoparticles were first prepared in an alcohol solution of acetylacetonate and benzophenone. Subsequently, the monomers were photopolymerized around the nanoparticles in the suspension-added precursor solution to form polymer–nanoparticle composite microspheres. Nanoporous polymer microspheres could then be obtained by removing the particles with acid. The products had been investigated by XRD, SEM, TEM, IR, DSC, and BET. Results showed the typical microspheres had diameters of 200~300 nm, and the specific areas and pore volume regularly varied with the quantity of the suspensions. By the optimum control, porous P(St-AM) microspheres with average pore size of 5.7 nm, pore volume of 0.18 cm 3 /g, and specific surface area of 123.54 m 2 /g could be obtained. The method represents a new, easily manipulated, cost-effective, and safe route for preparation of porous polymer microspheres using inorganic porogens.
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2019
·
IF 3.327
Jun-Kai Liu,Kai-Fei Wang,Kuo-Chih Chou,Guo-Hua Zhang
Ultrafine W-Cu composite powders with various copper (Cu) contents (5, 20 and 40 wt.%) have been fabricated by a method consisting of a carbothermic pre-reduction step and a subsequent hydrogen reduction step. After roasting the mixture of ammonium tungstate ((NH 4 ) 10 [H 2 W 12 O 42 ]· x H 2 O) and copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O), the mixture of CuWO 4 and CuO (or WO 3 ) was obtained. Subsequently, this mixture was pre-reduced by insufficient carbon black to generate the products containing W, Cu and a small amount of WO 2 which was further reduced to W in the following hydrogen reduction process. Thus, the ultrafine W-Cu composite powders were successfully produced. After sintering the green compacts made of these powders at 1100 ℃, 1150 ℃, 1200 ℃ and 1250 ℃, respectively, the microstructure, relative densities, electric conductivity and thermal conductivity of the sintered alloys were measured. The experimental results indicated that the higher the sintering temperature is, the better the performance of alloys will be.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 24
·10388-10398
·
IF 3.553
Zhong Mingjun,Zhang Shizhen,Dong Anwang,Sui Zhuyin,Feng Lijuan,Chen Qi
Heterogeneous metal–organic framework composites are widely used to catalyze the synthesis reaction of organic materials. Here, we report the use of a heterogeneous catalyst to catalyze the reaction of alcohols and amines to synthesize imines directly using a one-pot method. A low-dimensional Cu-MOF prepared by a simple surfactant-assisted method shows the morphology of nanorods. Cu-MOF nanorods provide an ideal support for preparing supported metal nanocatalysts. A reduction method was applied to immobilize the ultrafine noble metal Au and Pd nanoparticles on the surface of Cu-MOF nanorods to form a Cu-MOF/Au–Pd composite catalyst. Cu-MOF/Au–Pd catalyst is used to catalyze the reaction between alcohols and amines to form imines. Due to the synergy between different metal nanoparticles, it can effectively catalyze the reaction to form imines. In addition, Cu 2+ in Cu-MOF/Au–Pd catalyst facilitates the adsorption of substances by excess electrons and promotes product formation. After 12 h of catalytic reaction, the yield of imine is as high as 95%.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Libo Shi,Xiang Zhu,Tingting Liu,Hongli Zhao,Minbo Lan
In this work, we applied metal-organic frameworks (MOFs) as a porous matrix to encapsulate Cu nanoparticles (NPs) for nonenzymatic glucose sensing in alkaline media . SEM and TEM confirmed that the size of the encapsulated Cu NPs ranges from 2.5 to 5 nm. The hybrid of Cu NPs encapsulated in ZIF-8 (Cu-in-ZIF-8) was further modified onto screen-printed electrodes for nonenzymatic sensing of glucose in alkaline medium. The porous structure of ZIF-8 are beneficial for the unimpeded diffusion of glucose and reaction product. And as a matrix for encapsulating Cu NPs, ZIF-8 also protect the Cu NPs from dissolution and agglomeration during the electrocatalytic process. For comparison, the electrochemical performance of Cu NPs loaded on ZIF-8 (Cu-on-ZIF-8) was also investigated and it is found that Cu-in-ZIF-8 exhibited higher activity and better stability for cyclic test toward the oxidation of glucose in alkaline media. Additionally, Cu-in-ZIF-8 based glucose sensor also shows a favorable sensitivity and selectivity.
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高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Junwen Qi,Guoping Wei,Yubo Yan,Xiuyun Sun,Lianjun Wang,Jiansheng Li
Protecting the staff on site from exposure risk to toxic industrial chemicals (TICs) in an efficient way is of great significance. However, simultaneous removal of multicomponent TICs with different physical and chemical properties is a challenge for porous carbon materials. In this work, Cu-carbon beads with tailored porous structure and chemical property were synthesized via phase inversion-carbonization (PIC) route. The in-situ introduction of copper species was accomplished via coupling solidification-reduction of copper species and PIC process. The obtained Cu-carbon beads possessed uniform spherical shape (Φ1.3 mm) with good mechanical strength, developed porous structure and abundant chemical groups. Three kinds of TICs with different chemical properties, i.e. benzene (nonpolar), ethanol (polar) and H 2 S (inorganic), were selected as probes to evaluate the simultaneous elimination performance of Cu-carbon beads. The optimized Cu-beads-3 exhibited excellent performance for multicomponent TICs with capacities of 491.9 mg benzene/g, 192.1 mg ethanol/g and 76.2 mg H 2 S/g, representing 74.0, 60.3 and 99.2% capacities compared with monocomponent TICs. The enhanced adsorption of H 2 S were ascribed to chemisorption of copper species and basic groups on Cu-carbon beads. These results indicated that Cu-carbon beads would be a promising candidate for the simultaneous elimination of TICs with different chemical properties.
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LANGMUIR
·
2025
·
IF 3.9
Jie Chen,Chenyi Zheng,Qiang Wang,Zhipeng Xu,Kui Meng
Many innovations have been made in the morphology and preparation methods of copper–silver core–shell nanomaterials (Cu@AgNMs). The most commonly used method for preparing Cu@AgNMs is to perform a replacement reaction by adding a complexing agent, but there is no universally accepted method to select a complexing agent. This study found that the best complexing agent for preparing Cu@AgNMs is a short-chain complexing agent containing hydrophilic groups through the role of different complexing agents in the synthesis of the material, and the higher the stability of the short-chain hydrophilic complexing agent, the better the integrity of the resulting silver layer. This study clarifies the mechanism of different complexing agents in the synthesis of Cu@AgNSs, provides a reliable reference for the convenient preparation of Cu@AgNMs, and helps us to understand the influence of complexing agents on the silvering effect of the replacement process, thereby promoting the widespread application of a complex-replacement technology.
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