Small
·
2025
·
IF 12.1
Le Liu,Feng Chen,Haowei Yang,Xiaoli Yan,Jie Ren,Yanhui Song,Junjie Guo
Although Cu-N 4 -C single-atom catalysts (SACs) is proven to be a potential substitute for oxygen reduction reaction (ORR), the rigid coordination structure of Cu-N 4 active sites hampers mass transfer and electron transport during the ORR process, limiting their catalytic activity. In this study, an asymmetric coordination strategy (Cu-N-C/Cl) is implemented by doping chlorine, which subtly modulates the electronic structure of the Cu-N 4 coordination environment in two dimensions. The Cu-N-C/Cl electrocatalysts with the optimized electronic structure exhibit outstanding ORR activity across all pH ranges with the half-wave potentials of 0.915, 0.74, and 0.67 V ( vs . RHE) in alkaline, acidic, and neutral electrolytes, respectively. Experimental and theoretical findings demonstrate that the incorporation of Cl is crucial for enhancing ORR performance. This modification efficiently disrupts the electron symmetry of Cu-N 4 , resulting in a positive shift in the d-band center of Cu and optimizing the adsorption/desorption of ORR intermediates. Notably, the Cu-N-C/Cl electrocatalyst also shows promising performance in a Zn-air battery (ZAB), achieving a peak power density of 286 mW cm −2 and a specific capacity of 797.2 mAh g −1 . Moreover, this novel catalyst displays exceptional long-term stability, maintaining continuous operation for over 600 h, highlighting its significant potential for practical applications.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yan Lin,Min Xu,Xi Chen,Sixie Chen,Xiang Li,Wenle Yan,Ruixue Zhou,Di Chen
Solid oxide electrolysis cells (SOECs) are promising energy conversion devices capable of efficiently converting CO 2 into valuable products taken the advantage of heat and renewable electricity sources. The performance of SOECs is largely influenced by the cathode material, which governs the electrochemical reduction of CO 2 . In this work, we engineered metal-perovskite cathode by pre-depositing Cu nanocrystal onto the surface of La 0.1 Ca 0.9 Fe 0.1 Ti 0.9 O 3-δ (LCFT) cathode to well understand the effects of Cu metal nanocrystal in high temperature CO 2 reduction. This Cu nanocrystal deposition on cathode resulted in a significant reduction in polarisation resistance of SOEC by 50 % improved current density from 310 mA cm −2 to 456 mA cm −2 at 1.6 V. The cell also exhibits good stability over 100 h without obvious degradation. Extensive structural and chemical analyses indicate the deposited Cu nanocrystal facilitated the formation of oxygen vacancies and metal-oxide interface which should attribute to the enhanced electrochemical performance. This study provides new insights into the role of metal decoration in facilitating the high temperature direct CO 2 electrolysis performance.
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Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2025
·
IF 2.4
Weimin Yan,Chengmin Hou
The composite particles (St/Fe3O4) were prepared using the co-precipitation method, whereby FeSO4 and FeCl3 were precipitated under alkaline conditions. The particles were composed of a starch matrix and Fe3O4. Subsequently, AA was grafted and cross-linked onto the composite particles (St/Fe3O4) via a one-step traditional free radical polymerization method, resulting in the formation of polymer-modified composite particles (St/Fe3O4-g-pAA). The initiator used in this process was 2,2’-Azobis(2-methylpropionitrile). The structures of St/Fe3O4 and St/Fe3O4-g-pAA were characterized by FTIR, thermogravimetric analysis and hysteresis loop. The impact of varying parameters, including the dosage of the St/Fe3O4 and St/Fe3O4-g-pAA adsorbents, the initial pH value of the Cu(II) solution, the initial Cu(II) concentration, the absorption time, and the temperature, on the adsorption behavior of Cu(II) was investigated. The results demonstrated that St/Fe3O4-g-pAA exhibited excellent adsorption performance for Cu(II), with a unit adsorption capacity of 123.92 mg/g and a maximum removal rate of 85% when the original concentration of the Cu(II) solution was 10. The experiment was conducted with 24 mg/L of Cu(II) at a pH of 7 at room temperature, with a mass of 1.5 mg of St/Fe3O4-g-pAA and an adsorption time of 3 h. The adsorption process followed the Langmuir model and the pseudo-second-order kinetic model, which was dominated by chemical adsorption and belonged to single-layer adsorption. The results of the renewable performance studies demonstrated that following eight cycles of adsorption, 92% of the initial adsorption effect was retained. It can therefore be concluded that the St/Fe3O4-g-pAA adsorbent material prepared in this work is an effective means of improving the adsorption rate of Cu(II).
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Dong Liu,Zelu Zhou,Zhitao Han,Mengjing Zhang,Aicheng Song,Xi Wu,Xiao Yang,Dong Ma
In recent years, significant attention has been drawn to the advancement of high-performance solid acid catalysts, which enhance the CO 2 desorption efficiency and concurrently lower energy requirements. Although solid acid catalysts show promise in reducing regeneration energy for amine-based CO 2 capture, achieving an optimal balance between activity, cost, and stability remains a major challenge. Herein a series of solid acid catalysts were prepared by modifying attapulgite (ATP) with various CuO x loading, and the effect of Cu modification on CO 2 desorption performance was compared systematically. The results showed that CO 2 desorption performance of the as-prepared catalysts was in an order of 2/1-CuO x /ATP >1/1-CuO x /ATP >3/1-CuO x /ATP > CuO > ATP. The CO 2 desorption capacity and rate were increased by 194 % and 205 %, respectively, the relative heat duty could be reduced by about 64.5 % by using 2/1-CuO x /ATP to regenerate the rich MEA solution. ATR-FTIR technique was employed to confirm the catalytic effect and a possible catalytic CO 2 desorption mechanism was suggested. Additionally, the catalyst maintained 81 % of its initial CO 2 desorption capacity after seven consecutive absorption-desorption cycles, demonstrating excellent recoverability. This study provides a practical strategy for utilizing efficient, affordable and environmentally benign solid acid catalysts for CO 2 desorption, thereby advancing energy-efficient CO 2 capture technology.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jianghui Qiu,Xiafei Gao,Juan Peng
The formaldehyde oxidation reaction (FOR) with ultra-low potential is an ideal alternative to the oxygen evolution reaction (OER), significantly reducing hydrogen production energy consumption. This reaction not only generates high-value formic acid but also releases H 2 at low potential, enhancing hydrogen production efficiency and economic viability. However, developing efficient and low-cost electrocatalysts remains a key challenge. In this study, a Pt single atom on Cu nanowire catalyst shows high catalytic activity for formaldehyde oxidation reaction (FOR). The catalyst achieves a current density of 100 mA cm −2 at 0.09 V vs. RHE, with formic acid yield, selectivity, and formaldehyde conversion rate all close to 100 %. A bipolar hydrogen production system (FOR-HER) based on Pt SA -Cu NWs and Pt/C assembly achieves a current density of 100 mA cm −2 at a low cell voltage of 0.12 V, demonstrating a Faraday efficiency close to 100 % for H 2 at both the anode and cathode, and can stable operation for 30 h. Density functional theory (DFT) studies reveal that the interaction between Pt single atoms and Cu enhances hydrogen adsorption, significantly reducing the free energy of H* coupling and thereby improving hydrogen production efficiency. This study elucidates the intrinsic mechanism behind the enhanced performance, providing valuable guidance for the development of high-performance, low-cost single-atom catalysts.
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JOURNAL OF MATERIALS RESEARCH
·
2024
·Vol. 39
·期 14
·2082-2094
·
IF 2.7
Gao Chenyu,Deng Jikun,He Jiaxing,Wang Zechuan,Sheng Yuanyuan,Liu Junwu,Zhong Honghai,Tong Guoqing,Jiang Yang
A novel Cu/Ti 3 C 2 T X laminated composite foil was prepared using a combination of electroplating and electrophoretic deposition. The results indicate that the average thermal expansion coefficient of the Cu/ Ti 3 C 2 T X composite foil decreased by 11.26% compared to that of pure copper. Due to the high electron mobility of Ti 3 C 2 T X and the favorable Cu/ Ti 3 C 2 T X interface, the electrical conductivity of the Cu/ Ti 3 C 2 T X composite foil exceeded that of pure copper by 8.7%, reaching 6.2147 × 10 7 S·m −1 , and its thermal conductivity increased from 381.5 W/m·K to 423.5 W/m·K. The study revealed that a thinner, looser Ti 3 C 2 T X layer with fewer layers is more favorable for copper penetration and filling, enabling a continuous network-like structure and resulting in significantly improved thermal and electrical properties of the composite copper foil. These findings position the Cu/Ti 3 C 2 T X foil as a promising candidate for electronic encapsulation and super-conductivity. Graphical Abstract
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Yifang Wu,Jianwang Wu,Mei Lin,Zuliang Chen
The Fenton oxidation system is a widely employed advanced oxidation processes (AOPs) in wastewater treatment. However, the traditional Fenton oxidation system suffers from low oxidant utilization efficiency, leading to significant resource wastage. This study presents a novel self-Fenton Cu-Mn bimetallic catalyst (with a Cu:Mn ratio of 10:1), which is capable of simultaneously activating O 2 to generate H 2 O 2 in situ and further catalyzing the decomposition of H 2 O 2 to produce reactive oxygen species (ROS). Notably, this self-Fenton system demonstrate high removal efficiency for ciprofloxacin (CIP) across a broad pH range (2−9), achieving up to 92.55 % removal in water. Quenching experiments, electron paramagnetic resonance (EPR) analysis, steady-state concentration measurements, and Galvanic oxidation reactor (GOR) experiments collectively confirmed the generation of multiple ROS species (·OH, ·O 2 − , and 1 O 2 ) and indicated that electron transfer plays a significant role in pollutant degradation. X-ray photoelectron spectroscopy (XPS) analysis revealed that Cu 0 exhibited high catalytic activity, enabling simultaneous generation and activation of H 2 O 2 . Liquid chromatography-mass spectrometry (LC-MS) and toxicity assessments demonstrated a significant reduction in the toxicity of CIP degradation products. This work elucidates a novel Cu-Mn synergistic mechanism wherein Mn facilitates the generation of H 2 O 2 , while Cu effectively activates it into ROS. This synergism effect enables the removal of pollutants through both radical and non-radical pathways, thereby offering an innovative strategy for environmental remediation and AOPs.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Hu Yaping,Zhai Shasha,Guo Yaping,Dang Shan,Li Jing,Yang Miao
Electrochemical reduction reaction of CO 2 (CO 2 RR) to C 1 and C 2 products can be achieved on Cu-based electrocatalysts. C 2 products exhibit higher energy density and economic value compared to C 1 products, making them more desirable as reduction products. However, the production of C 2 products on pure Cu catalysts involves multi-step proton-coupled electron transfer and C–C coupling steps, which are kinetically slow and result in poor catalytic activity and selectivity for the products. The cavity nanocubes Cu 2 O(0.13-AA), Cu 2 O(0.10-AA) and Cu 2 O(0.15-AA) catalysts were synthesized via wet chemical reduction by adjusting the concentration of the reducing agent. The electrochemical pre-reduction method was used to obtain Cu 2 O/Cu(0.13-AA), Cu 2 O/Cu(0.10-AA) and Cu 2 O/Cu(0.15-AA) catalysts for CO 2 RR. Cu 2 O/Cu(0.13 M-AA) catalyst achieves the high Faradaic efficiency (FE) of 39.98% for C 2 H 4 and 54.76% for C 2 products (C 2 H 4 , C 2 H 6 , and C 2 H 5 OH), with significant inhibition of the hydrogen evolution reaction. In situ Raman experiments demonstrate that the cavity structure of the nanocubes enhances the local concentration of *CO intermediates, thereby promoting the C–C coupling process and improving the selectivity of CO 2 reduction to C 2 products.
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ELECTROANALYSIS
·
2025
·Vol. 37
·期 5
·e12050
·
IF 2.3
Sumin Xu,Wenjing Liu,Jinjin Zhang,Jianying Qu
In this work, Cu nanosphere-anchored Cu-based MOF derivants were synthesized by high-temperature calcination using Cu(BDC) as precursors and then combined with gold nanoparticles to give AuNPs/Cu/C composites. The proposed materials were characterized by SEM, XRD, XPS, FTIR, and EIS. Based on these composites, a sensor was constructed, which showed good electrocatalytic activities to the redox of acetaminophen (PA) and P-aminophenol (4-AP) and could be used to detect them simultaneously. Under optimal experimental conditions, the linear ranges for detection of PA and 4-AP were 0.50–150.00 and 0.50–120.00 μM with the detection limits of 0.056 and 0.084 μM, respectively. Thanks to the hierarchical and porous structural characteristics of the Cu/C material and its synergistic effect with AuNPs, it shows good sensing performance in the simultaneous detection of PA and 4-AP. The sensor has wider linear ranges, lower detection limits, good selectivities, and higher accuracies with potential environmental detection application prospects.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Nan Lu,Zhenyong Ying,Fozia Sultana,Xiaofan Zhang,Tongtong Li,Renhong Li,Benxia Li,Xiaoqing Yan
Harnessing the full solar spectrum through photothermal co-catalysis represents a transformative approach for optimizing energyconversion and advancing sustainable development. Herein, a hollow spherical Cu/CuO-Fe3O4 composite was developed as a photothermal cocatalyst for efficient hydrogen evolution. The unique hollow spherical architecture significantly enhances solar light harvesting, reduces thermal dissipation, and provides an ideal confined environment for catalytic reactions. Metallic Cu serving as the primary contributor to the LSPR effect, enabling effective light harvesting and photothermal conversion. Meanwhile, CuO, as a semiconducting oxide, contributes to charge separation and transfer, working synergistically with Fe3O4. A robust heterojunction interface between Cu, CuO, and Fe3O4 ensures efficient separation and migration of photogenerated charge carriers. This synergy, combining the LSPR effect of Cu, the photothermal properties of Fe3O4, and the catalytic functionality of CuO, results in significantly enhanced hydrogen evolution activity. Operated under an oxygen-mediated mechanism, the catalyst achieved an impressive hydrogen evolution rate of 13,371.36 μmol·gcatalyst-1·h-1 at a partial oxygen pressure of 1.0 atm. These findings underscore the potential of hollow spherical Cu/CuO-Fe3O4 composites as advanced photothermal co-catalysis as a viable pathway for next-generation clean energy applications.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-17
·
IF 3.9
Ge Rui,Tang Jing,Li Weijun,Liang Ping
In this study, a Cu-Sn superhydrophobic coating was fabricated on the surface of X70 steel via the electrodeposition method, resulting in an optimal contact angle of 164.2 ± 1.2°. Compared to the X70 substrate, the Cu-Sn coating exhibits superior corrosion resistance. In a 3.5 wt% NaCl solution, the polarization resistance ( R p ) is 71,037 Ω·cm 2 , approximately 48 times higher than the substrate; the corrosion current ( I corr ) is 2.23 × 10 − 7 A/cm 2 , roughly two orders of magnitude lower than that of the substrate. This enhancement is attributed to the addition of Sn, which combines with Cu to form a Cu-Sn alloy with a micro-nano structure, effectively improving the hydrophobicity and corrosion resistance of the coating. However, excessive SnSO 4 can hinder the formation of the micro-nano structure, leading to aggregation on the coating surface. In addition, the coating exhibits excellent self-cleaning properties and mechanical stability. After undergoing rigorous mechanical stability tests, including tape peeling, sandpaper abrasion, water drop impact, and sand erosion, the contact angle remains above 155°. These results are significant for addressing the issue of long-term durability and stability of superhydrophobic coatings in industrial applications and provide new prospects for the deposition of metals or alloys.
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Small
·
2025
·
IF 12.1
Teng Zhang,Xueya Dai,Yihong Yu,Xin Cui,Yunlong Li,Gaowu Qin,Wei Qi,Song Li
Electrochemical conversion of CO 2 into value-added multi-carbon products is highly attractive for CO 2 utilization using sustainable electricity energy. However, achieving high ethanol selectivity of copper-based catalysts remains challenging due to the competing side reactions such as ethylene formation. Herein, a novel electrocatalyst, PANI-Ag/Cu-OH is reported, comprising of polyaniline-supported silver single atoms coupled with hydroxyl-modified copper clusters. Tandem reduction of CO 2 into ethanol with a high selectivity is realized by coupling CO formation on Ag site and further reduction on hydroxylated Cu sites. The synergistic approach enables a high Faradaic efficiency of 68.9% for ethanol with a current density of −263.8 mA cm −2 at −0.78 V versus RHE in alkaline media. CO-TPD and in situ infrared spectra studies reveal that strong CO adsorption and Cu + species stabilized by hydroxyl groups are crucial for asymmetric C–C coupling and stabilization of the ethanol intermediates, leading to the enhanced ethanol selectivity.
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