CATALYSIS LETTERS
·
2020
·Vol. 150
·期 7
·2045-2055
·
IF 2.482
Li Chaoqun,Yang Yang,Ren Wei,Wang Jian,Zhu Tingyu,Xu Wenqing
Abstract CO is toxic and detrimental to human beings and the atmosphere. The presence of CO has become one of the important indicators for evaluating ambient air quality. Iron and steel sintering generate large amounts of flue gas emissions containing approximately 1% CO, which has become an important factor restricting the improvement of air quality in steel cities. The catalytic oxidation method is the simplest and most effective method for CO emission control. In this work, a series of Cu x Ce y /TiO 2 catalysts with different Ce doping levels were prepared by a one-step impregnation method and subsequently tested for catalytic CO oxidation. The Cu 0.5 Ce 0.5 /TiO 2 sample has the best catalytic activity under the conditions of 1% CO and 10% H 2 O. The catalysts were next characterized by XRD, BET, TEM, H 2 -TPR, XPS and in-situ DRIFTS methods. The characterization results show that Ce doping promotes the dispersion of copper species on the catalyst surface and improve the redox performance of the catalyst. The results of in-situ experiments showed that both Cu/TiO 2 and Cu 0.5 Ce 0.5 /TiO 2 catalysts followed Mars and van Krevelen mechanism, and Ce doping enhanced the adsorption and activation of oxygen, thus improving the low-temperature reaction activity of the catalysts. Graphic Abstract
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SENSORS
·
2023
·Vol. 23
·期 20
·8536
·
IF 3.9
Yanxun Guan,Fen Xu,Lixian Sun,Yumei Luo,Riguang Cheng,Yongjin Zou,Lumin Liao,Zhong Cao
Due to the strong oxidizing properties of H2O2, excessive discharge of H2O2will cause great harm to the environment. Moreover, H2O2is also an energetic material used as fuel, with specific attention given to its safety. Therefore, it is of great importance to explore and prepare good sensitive materials for the detection of H2O2with a low detection limit and high selectivity. In this work, a kind of hydrogen peroxide electrochemical sensor has been fabricated. That is, polypyrrole (PPy) has been electropolymerized on the glass carbon electrode (GCE), and then Ag and Cu nanoparticles are modified together on the surface of polypyrrole by electrodeposition. SEM analysis shows that Cu and Ag nanoparticles are uniformly deposited on the surface of PPy. Electrochemical characterization results display that the sensor has a good response to H2O2with two linear intervals. The first linear range is 0.1–1 mM (R2= 0.9978, S = 265.06 μA/ (mM × cm2)), and the detection limit is 0.027 μM (S/N = 3). The second linear range is 1–35 mM (R2= 0.9969, 445.78 μA/ (mM × cm2)), corresponding to 0.063 μM of detection limit (S/N = 3). The sensor reveals good reproducibility (σ = 2.104), repeatability (σ = 2.027), anti-interference, and stability. The recoveries of the electrode are 99.84–103.00% (for 0.1–1 mM of linear range) and 98.65–104.80% (for 1–35 mM linear range). Furthermore, the costs of the hydrogen peroxide electrochemical sensor proposed in this work are reduced largely by using non-precious metals without degradation of the sensing performance of H2O2. This study provides a facile way to develop nanocomposite electrochemical sensors.Keywords:H2O2sensors;polypyrrole;electropolymerization;electrodeposition;Ag nanoparticle;Cu nanoparticle
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 19
·8845-8853
·
IF 4.682
Shu Ling,Liu Wei,Deng Hong-Bin
Integrating energetic materials with microelectromechanical systems (MEMS) to realize miniaturized energetic chips has shown broad application prospects in micro-spacecraft, micro-satellites, ballistic correction munitions, and smart munitions. In this work, a new type of MEMS compatible Cu/ICM-101 energetic film was successfully fabricated on copper substrates by in-situ electrochemical synthesis, the morphology and ignition property of which can be effectively controlled by adjusting the voltage and electrochemical deposition time. The morphology, composition, thermal properties, and ignition performance of as-prepared Cu/ICM-101 films were characterized by scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, and pulsed laser. The results show that the as-prepared Cu/ICM-101 films possesses nano porous framework structure with an exothermic heat of 1800.9 J·g −1 and a thermal decomposition peak temperature of 256.4 °C. In addition, the flame height and ignition duration of which reach 10 mm and 300 μs, respectively. This work provides a reference for the integration and application of energetic materials in MEMS systems.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Bao Liu,Chao Cai,Baopeng Yang,Kejun Chen,Yan Long,Qiyou Wang,Shuandi Wang,Guozhu Chen,Hongmei Li,Junhua Hu,Junwei Fu,Min Liu
Electrochemical carbon dioxide (CO 2 ) reduction reaction (CO 2 RR) to obtain C2/multi-carbon fuels is an appealing technology to reduce carbon emission and store intermittent renewable electricity. The C–C coupling process, as the most critical step for generating C2/multi-carbon fuels, strongly depends on the concentration of *CO intermediates around the active sites. In this work, we prepared porous copper nanospheres (P-Cu) that greatly improved the C–C coupling process by enriching *CO intermediates in the pore structure . The specific pore features of P-Cu were characterized in detail by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen adsorption/desorption tests. Obviously, the P-Cu exhibits higher specific surface area and richer pore structure than the control sample compact copper nanosphere (C-Cu). The CO gas sensor and temperature programmed desorption (TPD) tests prove that the P-Cu has better CO adsorption and enrichment capacity than C-Cu due to the rich pore structure. As a result, P-Cu exhibited a high C2 selectivity with a Faradaic efficiency (FE C2 ) of 57.22% at −1.3 V ( vs . RHE), which is about 2.5-fold than the C-Cu (FE C2 of 22.71%). This work provides an effective strategy to improve the activity and selectivity of C2 products in CO 2 RR by optimizing the adsorption/enrichment property of intermediates.
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RSC Advances
·
2012
·Vol. 2
·期 7
·2666-2670
·
IF 0
Meina Wang,Xiangyou Liu,Chuanbao Cao,Cui Shi
Cu–In–S ternary nanocrystals (NCs), with an average size of less than 10 nm, were synthesized in an aqueous solution containing bovine serum albumin (BSA). X-Ray powder diffraction (XRD) and selected-area electron diffraction (SAED) analyses showed that these NCs featured a roquesite structure. The composition of the NCs could be adjusted by controlling the molar ratio of the starting Cu/In precursors in the reaction solution, which led to a tunable band gap ranging from 1.48 eV to 2.30 eV. Cytotoxicity testing showed that the BSA-stabilized Cu–In–S NCs had little effect on the cell viability, which suggested that they are user-friendly and environmentally benign. With low cost, minimal energy input and environmental impact, this simple approach shows great potential for industrial applications.
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Catalysts
·
2025
·Vol. 15
·期 12
·1156
·
IF 4
Quan Zhou,Lewa Zhang,Ziluo Wang,Qiutong Wang,Chenyuan Zhu
Electrochemical nitrate reduction to ammonia offers a sustainable route for nitrogen fixation, yet achieving high efficiency and selectivity remains challenging. Here, a Sustainion-enabled Cu/Co tandem catalyst is developed to couple compositional synergy with ionomer-mediated interfacial regulation. The optimized Cu60Co40/Sus/C electrode delivers a Faradaic efficiency of 91.3% and an NH3yield rate of 2.63 mmol gcat.−1h−1at −0.3 V vs. RHE, surpassing Cu-Co/Nafion/C and Cu-Co/C counterparts. Structural analyses confirm that Sustainion prevents nanoparticle aggregation and maintains robust Cu/Co interfaces. Electrochemical and in situ spectroscopic studies reveal that the cationic quaternary ammonium groups of Sustainion electrostatically enrich NO3−/NO2−intermediates, facilitating their adsorption and hydrogenation toward NH3formation. The combined structural stabilization and intermediate modulation enable efficient tandem catalysis between Cu-driven nitrate activation and Co-mediated hydrogenation. This work provides molecular-level insight into ionomer–catalyst interactions and highlights interfacial engineering as a powerful strategy for sustainable ammonia synthesis.
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Nature Communications
·
2025
·
IF 15.7
Yao Yuan,Zhang Xinyue,Cao Yingying,Liu Long,Zhang Yanqiang,Zhang Suojiang
Cyclopropane-based aerospace fuels exhibit the excellent volumetric calorific value, leading to broad application prospects in aircrafts. However, due to the highly rigid structure of the cyclopropane (compared to cyclobutane or cyclopentane, etc.) and the difficulty in forming metal-carbene intermediates, there are still significant challenges in the precise synthesis of multi-cyclopropane-based high-energy fuels ( ≥ 2 cyclopropane structures). Herein, via the introduction of bending strain on metal organic complex, we report a single-site Cu/single-walled carbon nanotube catalyst (Cu/SWCNT), which possesses 2.6-fold conversion (up to 77.4%) and 4-fold selectivity (up to 45.7%) as that without bending strain for the preparation of bi-cyclopropane-based fuels from dienes. XAFS and DFT calculations show that bending strain enhances the upward shift of d-band center of β electrons (−4.370 to −4.366), thus promotes the adsorption and activation of CH 2 N 2 and alkenes. Moreover, bending strain elongates Cu-O bonds (1.91 to 1.96 Å), making it easier for CH 2 N 2 to insert and form Fischer carbene intermediates. These two aspects obviously reduce the reaction energy barrier from 40.3 to 33.7 kcal·mol -1 for the cyclopropanation process. Our work provides a method of strain engineering to regulate C-C coupling reactions at the molecular level, and achieve highly efficient cyclopropanation from alkenes.
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CRYSTAL GROWTH & DESIGN
·
2023
·
IF 3.8
Hongren Rong,Gexiang Gao,Xiaocen Liu,Xiaojuan Chen,Qingyan Jiang,Xiuting Song,Daozhen Shen,Wenlong Liu,Qi Liu
It is a considerably attractive task to search for new high-performance electrode materials for supercapacitors from pristine coordination polymers. Herein, a one-dimensional (1D) Cu-based coordination polymer ([Cu(BGPD)(DMF)2(H2O)], Cu-BGPD; BGPD = N,N′-bis(glycinyl)pyromellitic diimide; DMF = dimethylformamide) has been synthesized. When utilized as the electrode material for supercapacitors, in a three-electrode system, the Cu-BGPD electrode delivers a high specific capacitance of 1530 F g–1 (corresponding to a specific capacity of 213 mAh g–1) at 1 A g–1 with a capacitance retention of 95.9% after 2000 cycles at 1 A g–1. Impressively, the asymmetric supercapacitor comprising Cu-BGPD as the positive electrode and the rGO as the negative electrode delivers the maximum energy density of 15.25 Wh kg–1 at a power density of 0.85 kW kg–1. Our research shows that it is also a practical way to develop new high-performance electrode materials of supercapacitors from 1D coordination polymers.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Pengchao Si,Chunyang Duan,Mengqi Li,Zenghua Zhao,Dong Zhao,Yunfa Chen,Yu Wang
Two-dimensional materials have been extensively investigated in the fields of electrochemical sensors, field-effect transistors, and other electronic devices due to their large surface areas, high compatibility with device integration, and so on. Conventional electrodes, such as precious metal layers that are deposited on polymer or silicon wafers, have gradually revealed increasing difficulties in adapting to various device structures, especially for two-dimensional materials, which prefer high exposure of surface atoms. Here, we demonstrate a tailorable metal–ceramic (Cu-TiC0.5) layered structure as novel electrodes with high mechanical property and conductivity and fabricate a highly sensitive gas sensor with graphene lying on this proposed electrodes. The Cu-TiC0.5 layered structure exhibits remarkably high tensile yield strength and compressive yield strength, which increase 7 and 8 times than those of the pure copper, respectively. Meanwhile, excellent flexibility and conductivity could also be obtained with the further thinning of the Cu-TiC0.5 layered composite, which shows its potential applications in flexible electronics. Finally, we demonstrated that a graphene-based gas sensor fabricated on tailored metal–ceramic electrodes was ultrasensitive and robust, which benefits from the good thermal conductivity and peculiar gas channels etched on the surface of copper alloy electrodes.
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Ping Qiu,Yongyong Lai,Xulu Sun,Changfeng Chen,Lei Ge
Various approaches have been developed to enhance n-type Cu 2 O photoelectrochemical activity. This study introduced a simple method of tuning electronic structure through adjusting solution pH when electrodeposition of Cu 2 O films on FTO substrate. Combined surface analysis showed that the Cu 2 O films presented gradual change cruciate flower-like nanostructure and hybrided with metallic copper. The Cu/Cu 2 O films presented a visible light response and the band gap could be effectively decreased by increasing the deposition solution pH. The photoelectrochemical cathodic protection performance of the films was studied. The electrode potential of 304 stainless steel by coupling with the Cu/Cu 2 O films (deposited at pH 5) reached the most negative photopotential shift of 179 mV under illumination. The related photocurrent density was 0.12 mA/cm 2 . This enhanced photoelectrochemical performance was evidenced by both direct excitation of Cu 2 O and the surface plasmon resonance effects of Cu upon illumination.
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AICHE JOURNAL
·
2025
·
IF 4
Lixia Li,Zhechao Huang,Menghao Jiang,Jinxing Long
A novel approach is proposed for producing 4-ethylcyclohexanol, a versatile petrochemical in the polymer industry, from the renewable lignin in the presence of Cu–Ni/MgCrO x spinel catalysts. Under the synergistic effect between the Ni 0 , Cu, + and the balanced acidic and basic properties of MgO and MgCr 2 O 4 , an exceptional yield of monomer (30.1 wt%) with 59.5% selectivity of 4-ethylcyclohexanol (yield of 17.9 wt%) was achieved when the depolymerization of bamboo lignin was performed with Cu 6 Ni 20 /MgCr 0.5 O x (Cr:Mg = 0.5). Catalyst characterization illustrated that the formation of MgCr 2 O 4 spinel, which restrained the generation of NiMgO 2 solid solution and increased the concentration of Ni 0 species, along with the surface electron effect between Ni 0 and Cu + , contributes to this superior hydrodeoxygenation performance of lignin. Mechanistic investigation further demonstrated that the conversion of lignin to 4-ethylcyclohexanol involves a tandem process of C β –O bonds cleavage, demethoxylation, and saturated hydrogenation. Therefore, this work provides new insights on lignin utilization.
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Batteries & Supercaps
·
2025
·
IF 4.7
Chang He,Qiao Jiang,Zhehan Yi,Jin Yu,Pinxiang Li,Shandong Tan,Ji Liang,Feng Hou
Aqueous zinc-ion batteries (AZIBs) are currently highly promising rechargeable batteries offering affordable prices and high reliability. However, the uncontrolled expansion of zinc dendrites, hydrogen evolution reaction, and adverse reaction greatly affect their potential sustainable application. Herein, Cu–Sn nanoparticle alloy-modified carbon nanofibers (Cu/Sn–C) are constructed as a buffer interface region onto the zinc anode. The high density of zincophilic sites of the Cu/Sn–C contributes a homogeneous Zn deposition behavior, ameliorates potential separator penetration of zinc dendrites, and weakens corrosions and adverse reactions. As a result, Cu/Sn–C exhibits a low zinc nucleation overpotential of 33.2 mV and dendrite-free zinc deposition. Besides, a symmetric cell with Cu/Sn–C@Zn anode exhibits outstanding cycling lifespan with over 3500 h at 1 mA cm −2 for 1 mAh cm −2 . Furthermore, Cu/Sn–C@Zn//Mn x V 2 O 5 full battery also achieves stable cycling at 5 A g −1 . This work provides a significant avenue for enhancing the reliability of the Zn anode, thereby facilitating the advancement of widespread applications for the next-generation AZIBs. Graphical Cu–Sn nanoparticle alloy-modified carbon nanofibers (Cu/Sn–C) are constructed as a buffer interface region onto the Zn metal anode. The abundant zincophilic sites of the Cu/Sn–C contribute a homogeneous Zn deposition behavior and weaken side reactions. Therefore, Cu/Sn–C presents a superior rate capability and long-term cycling stability.
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