DIAMOND AND RELATED MATERIALS
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2019
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IF 2.29
Congyang Lu,Xiaomei Feng,Yifu Shen,Ye Tian,Jian Jiang,Linquan Hu
In this work, diamond/Cu-1Cr composite coatings were successfully prepared on T2 Cu substrate via mechanical milling method. The effects of high temperature annealing on the microstructure, wear resistance and thermal conductivity of coatings have been studied. The results showed that the diffusion ability of copper and chromium was enhanced to form segregation after annealing at 700 °C, while chromium carbides were formed on the surface of diamond. When the annealing temperature was higher than 800 °C, the loose lamellar structure was formed from the surface to the inside of the coating. The friction coefficient of the annealed coating at light load was lower than that of the unannealed coating, much lower than that of pure copper. The wear resistance of the unannealed coating was far superior to that of pure copper, but it decreased slightly after annealing. After annealing at 700 °C, the thermal conductivity of the coated sample was significantly improved to 346.91 W·m −1 ·K −1 . Increasing the annealing temperature would result in the deterioration of heat conduction.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
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IF 6.155
Liqianyun Xu,Liuyang Zhang,Bei Cheng,Jiaguo Yu,Ahmed A. Al-Ghamdi,S. Wageh
Poor conductivity and rate capability are the obstacles faced by nickel-cobalt composites as electrode materials for supercapacitor application. Herein, simple electrochemical treatment conducted by cyclic voltammetry is applied and the overall performance of the active material is considerably enhanced. We discover that this treatment triggers the formation of Ni-Co-Cu ternary composite and optimizes the crystal structure of the untreated counterpart. The areal capacitance of the treated sample rockets up to 6.13 F cm −2 at 2 mA cm −2 , almost 13 times higher than the untreated ones. Besides, the resistance is substantially reduced by cyclic voltammetry treatment. Moreover, the Coulombic efficiency and stability are concurrently elevated. The reasons behind this treatment are mulled over and reasonable hypothesis is suggested. This study provides a cheap and effortless way to reform the structures of as-obtained samples as well as vigorously raise the performance of current available materials.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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功能材料
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ACS Applied Materials & Interfaces
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2017
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IF 7.504
Jinlian Bi,Jianping Ao,Qing Gao,Zhaojing Zhang,Guozhong Sun,Qing He,Zhiqiang Zhou,Yun Sun,Yi Zhang
Electrodepositon of Ga film is very challenging due to the high standard reduction potential (−0.53 V vs SHE for Ga3+). In this study, Ga film with compact structure was successfully deposited on the Mo/Cu/In substrate by the pulse current electrodeposition (PCE) method using GaCl3 aqueous solution. A high deposition rate of Ga3+ and H+ can be achieved by applying a large overpotential induced by high pulse current. In the meanwhile, the concentration polarization induced by cation depletion can be minimized by changing the pulse frequency and duty cycle. Uniform and smooth Ga film was fabricated at high deposition rate with pulse current density 125 mA/cm2, pulse frequency 5 Hz, and duty cycle 0.25. Ga film was then selenized together with electrodeposited Cu and In films to make a CIGSe absorber film for solar cells. The solar cell based on the Ga film presents conversion efficiency of 11.04%, fill factor of 63.40%, and Voc of 505 mV, which is much better than those based on the inhomogeneous and rough Ga film prepared by the DCE method, indicating the pulse current electrodeposition process is promising for the fabrication of CIGSe solar cell.
研究领域:
材料科学
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电化学
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光伏技术
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薄膜技术
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 13.2
Xinya Chen,Chengcheng Zhu,Qinghua Liu,Yaning Liu,Miao Ji,Haonan Chen,Lu Jiang,Gang Lu
Electroreduction of carbon dioxide (CO 2 ) to valuable chemicals provides a promising solution to reducing CO 2 emissions and alleviating energy crisis. Coating or grafting catalyst with organic molecules or polymers could effectively improve the Faradaic efficiency (FE) of C 2 products in CO 2 electroreduction (CO 2 ER). However, to date, most efforts have focused on single-component coatings to enhance the FE of C 2 products in CO 2 ER. Herein, the surface of copper (Cu) catalyst is simultaneously coated with a thin layer composed of both small molecule of benzotriazole (BTA) and polymer of polyvinyl chloride (PVC). This BTA&PVC-coated Cu catalyst demonstrates a high FE of C 2 products up to 71.0 ± 5.6% in an H-type electrochemical cell, in contrast to the FE of ~36% for bare Cu. The improved CO 2 ER performance is attributed to the effective stabilization of key reaction intermediates and optimized electronic structure on Cu surface, facilitated by the synergistic effect of the simultaneously coated BTA&PVC film. In addition, the BTA molecules could be perfectly confined within PVC matrix, resulting in a high catalytic stability. In summary, this work provides an effective strategy to effectively improve the FE of C 2 products in CO 2 ER and this strategy could be easily migrated to many other catalytic systems.
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ANALYTICA CHIMICA ACTA
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2026
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IF 6
Mengxue Tang,Jiale Zhang,Qixuan Mu,Keyan Chen,Yibing Ji
Background Enantiomers may have differences in biological effects, pharmacological activity, and toxicity. Currently, global regulatory authorities are imposing increasingly stringent approval requirements for single-enantiomer drugs. Coupled with the continued growth of the chiral pharmaceutical market, this makes the development of chiral separation technology an urgent scientific task. Therefore, the separation and analysis of chiral drug enantiomers are directly related to human health. Enzyme-based chiral stationary phase (CSP) is a promising platform. Unfortunately, the fragility of natural enzymes, as well as the complexity and low efficiency of the preparation process, hinder their practical application in chiral separation. Results Metal organic frameworks (MOFs), which have enormous potential in the fields of enzyme immobilization and capillary electrochromatography (CEC) separation, were explored as support materials with good enzyme immobilization performance and CSP with separation abilities. Lipase (from porcine pancreatic) was encapsulated into a metal organic framework (MOF) under the concept of "in situ". Effective enzyme loading capacity enables composite materials (Lipase@HKUST-1) to inherit lipase's natural chiral recognition ability. On this basis, inspired by the same concept, Lipase@HKUST-1 was directly grown in the open column for capillary electrochromatography (CEC). By optimizing the interface combination method and simplifying the column preparation steps, the efficiency and performance of capillary column preparation have been effectively improved. Enantiomer separation of multi-chiral drugs such as naproxen and chlorpheniramine has been achieved. Theoretical calculations further explore potential chiral recognition mechanisms. Significance The effective combination of cost-effective lipase (from porcine pancreatic) and MOF materials enriches the library of chiral materials for enantioseparation. The understanding of the chiral recognition mechanism inspires the design of ideal performance materials. The highly stable MOF separation platform for biological functions has introduced a pioneering research paradigm for the CSP development of OT-CEC.
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ACS Applied Materials & Interfaces
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2026
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IF 8.2
Yuan Ma,Yongli Li,Lan Jiang,Xin Kong,Xin You,Liang Liu,Rui Bao,Zhenhua Ge,Hao Cui,Feng Liu,Jianhong Yi
The energy-intensive Haber-Bosch process for ammonia synthesis necessitates sustainable alternatives, electrochemical nitrate reduction (eNO3RR) is emerging as a promising route to address nitrate pollution. However, it faces a critical bottleneck: the low ammonia selectivity arising from competitive hydrogen evolution. Herein, we introduce copper carbon dots-supported iron phthalocyanine (Cu-CDs/FePc) - a electrocatalyst featuring dynamic Cu–Fe dual sites that steer tandem e–/H+ delivery for efficient NH3 electrosynthesis. It achieves an outstanding ammonia yield of 17.69 mg h–1 mgcat.–1 with a remarkable Faradaic efficiency of 91.0% at −0.7 V vs RHE in acid conditions, which surpasses many reported transition metal-based electrocatalysts for eNO3RR. In-situ FTIR spectroscopy and density functional theory (DFT) calculations elucidate that dynamic Cu–Fe dual sites orchestrate directional electron–proton relay chains through electronic complementarity: Electron-deficient Cu2+ centers intensify NO3– adsorption/activation, while electron-enriched Fe2+ sites drive *NO2 protonation, and interfacial charge shuttling initiates valence oscillations (Cu+/Cu2+ and Fe2+/Fe3+) effectively lower rate-determining step energy barrier, thereby boosting ammonia selectively while simultaneously suppressing hydrogen evolution. Furthermore, the catalyst exhibits robust stability over 100 h and practical versatility in zinc-air battery systems. This work presents a rational design strategy for high-performance eNO3RR catalysts, offering a significant advance toward efficient green ammonia synthesis and environmental remediation.
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JOURNAL OF MATERIALS SCIENCE
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2026
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IF 3.9
Fu Guoning,Peng Cheng,Wu Wei,Xiong Tianying,Lv Fanghui,Li Kuan,Liu Dong
Copper-based catalysts for Suzuki coupling reactions face limitations in efficiency and stability, while conventional palladium catalysts require high costs and harsh conditions. To address these challenges, we developed a bifunctional copper-loaded black phosphorus (Cu/BP) material. Initially, a series of Cu/BP catalysts (1–5 wt% Cu) were synthesized via wet chemical reduction. Subsequently, catalytic performance was evaluated using vector network analysis and a microwave catalysis system. Key results were obtained: Cu/BP-3 exhibited exceptional microwave absorption (minimum reflection loss: − 36.31 dB; effective bandwidth: 6.64 GHz). Under microwave heating (90 °C) with ultralow copper loading (0.25 mol%) in H 2 O/CH 3 OH (1:1 v/v), > 99.7% bromobenzene conversion was achieved within 2 h. This represents a 5.5-fold enhancement compared to conventional oil-bath heating. The catalyst maintained > 95% yields for bromobenzene substrates bearing strong electron-withdrawing/donating groups and ortho-substituents. Remarkably, > 95.4% activity retention was observed after 10 cycles, with copper leaching < 0.01 ppm. This work demonstrates that Cu/BP efficiently activates C–Br bonds through synergistic dielectric energy localization and interfacial charge transfer (P → Cu). It provides a new strategy for designing green, stable non-precious metal catalysts for microwave-driven reactions.
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Science China-Materials
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2026
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IF 7.7
Guan Yongmao,Yang Liqing,Guo Chen,Chen Mingde,Chen Qinfang,Wang Pengfei
This work presents a cracked template and vacuum metal evaporation strategy for fabricating structurally randomized copper (Cu) mesh films. Regulating the internal stress distribution within the coating during template cracking enables the controlled fabrication of Cu mesh films with varying discrete degrees of mesh aperture area and distinct probability distributions of metal line inclination. The influence of structural parameter randomization within the Cu mesh films on properties has been systematically investigated, encompassing higher-order diffraction energy homogenization, optoelectronic performance, and electromagnetic interference shielding effectiveness (EMI SE ). Results demonstrate that increasing structural randomization effectively suppresses higher-order diffraction energy, achieving a reduction to −3.93 dB in normalized higher-order diffraction energy. Furthermore, the Cu mesh film exhibited minimal degradation on imaging system performance, with resolution decreasing only marginally from 80.6 to 71.8 lp/mm. Simultaneously, the most randomized Cu mesh film demonstrates an ultra-low sheet resistance (3.31 Ω/sq), high visible light transmittance (88.7% at 550 nm), an exceptional figure of merit (FoM=913.69), and robust EMI SE within the X-band (average SE of 33.18 dB). These findings underscore that metal mesh films incorporating structural randomization offer an effective strategy for enhancing EMI shielding in high-performance optoelectronic imaging systems.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
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IF 19.7
Wenda Chen,Shenghua Ye,Wei Zeng,Xin Wang,Yixiao Zou,Peng Cui,Kang Liao,Lirong Zheng,Yantong Xu,Qianling Zhang,Xiaopeng Han,Wenbin Hu
1,4-benzenedicarboxylate-modified Cu nanosheets were synthesized via 2D Cu-BDC MOF precursor and template. • Carboxyl groups on Cu surface enhance H 2 O accumulation for sustained proton supply. • Carboxylate-mediated proton transfer accelerates *NO → *NOH. Tailoring the interfacial microenvironment is essential for regulating proton-coupled electron transfer (PCET) dynamics, key processes governing the electrochemical nitrate reduction reaction (NO 3 − RR) for efficient ammonia (NH 3 ) synthesis. Herein, we design a metal-organic framework-derived Cu nanosheet architecture modified with 1,4-benzenedicarboxylate (BDC@Cu NSs), where BDC molecules serve as built-in “proton pumps” to boost electrocatalytic NO 3 − RR with higher NH 3 production. In situ spectroscopic characterizations, kinetic isotope effect measurements and theoretical calculations demonstrate that the carboxylate groups (−COO − ) of BDC 2− adsorbed on the Cu interface construct an enhanced interfacial hydrogen-bond network for facilitating H 2 O accumulation and dissociation, and capture and transfer protons to nitrogen-containing intermediates via a PCET pathway, which drastically lowers the energy barrier of the potential-determining step (*NO hydrogenation to *NOH), endowing BDC@Cu NSs with a high NH 3 yield, superior Faradaic efficiency, and outstanding operational durability. This study presents a design strategy for engineering electrocatalytic interfacial microenvironments and provides fundamental insight into proton transport within hydrogen-bonded networks at the interface. Download: Download high-res image (136KB) Download: Download full-size image Constructing built-in proton pumps on MOF-derived Cu nanosheets via surface-anchored carboxylate groups enables efficient electrocatalytic nitrate reduction. These groups establish an enhanced interfacial hydrogen-bond network, facilitating H 2 O dissociation and selective proton transfer to *NO intermediates, thereby drastically lowers the energy barrier for ammonia synthesis.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2026
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IF 3.1
He Shuangyi,Zhao Weiwei,Zhang Shuai,Li Tianbao,Luo Jujie
Cu − Bi bimetallic material with excellent electrochemical performance was successfully fabricated on iron foam via a one-stop microwave method. Under the optimal microwave power, heating time, and metal molar ratio, metallic Bi presents a needle-like morphology, interconnects to form a network, and is coated with Bi. This unique structure endows the Cu − Bi bimetal with the best electrochemical performance. Meanwhile, metallic Fe undergoes redox reactions in the alkaline electrolyte, which further enhances the capacitance value. The electrode prepared under the optimal synthesis conditions achieves an impressive areal capacitance value of 7.55 F cm −2 when tested at 1 A cm −2 , and it maintains 77.47% of its initially measured capacitance even after undergoing 15,000 long-term charge–discharge cycles, demonstrating excellent electrochemical stability. The assembled asymmetric supercapacitor device retains 84.1% of its original capacitance after 20,000 cycles. A power density value of 1185 μW cm −2 is realized when the energy density reaches 766.96 μWh cm −2 .
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ACS Applied Materials & Interfaces
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2026
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IF 7.8
Dewen Fu,Guoju Wang,Zhifeng Zhang,Zhiqiang Wu,Xuemei Zhang,Wenfei Dong
Ammonia, as a crucial feedstock in the chemical industry, is traditionally synthesized via the energy-intensive and high-carbon-emission Haber–Bosch process, which contradicts sustainable development goals. The electrocatalytic nitrate reduction reaction (NO3RR) for ammonia synthesis has emerged as a research hotspot due to its low energy consumption and environmental friendliness. However, existing catalysts still suffer from high overpotentials, competitive hydrogen evolution reaction (HER), and intermediate accumulation. In this study, we successfully fabricated copper-doped cobalt phosphide (Cu-CoP) catalysts through hydrothermal and phosphidation strategies, systematically investigating their NO3RR performance and mechanism. Experimental results demonstrate that Cu-CoP exhibits exceptional catalytic activity at −0.65 V vs RHE, achieving a Faradaic efficiency of 96.2% and an ammonia production rate of 7.06 mg cm–2 h–1, significantly outperforming undoped CoP catalysts. Through comprehensive characterization and theoretical calculations, we reveal that Cu incorporation not only optimizes the electronic structure of Co sites to facilitate water dissociation and *H generation, but also enables efficient nitrate adsorption at Cu sites while suppressing *H dimerization, thereby synergistically enhancing NO3RR selectivity and kinetics. This work provides insights for designing high-performance nonprecious metal NO3RR catalysts and elucidates the cooperative mechanism of dual active sites.
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iScience
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2026
·Vol. 29
·期 6
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IF 4.5
Ziyu Wang,Xuejie Han,Baohao Qian,Xiulai Zhang,Jingyuan Ma,Ru Feng,Meiqin Shi,Guangbo Chen,Fanfei Sun
Photothermal catalytic reduction of CO 2 to CO has been regarded as a promising strategy for solar-to-chemical energy conversion, yet the dynamic evolution of active sites under realistic reaction conditions remains poorly understood. Herein, we synthesized CuO/ZnO (CuZnO) catalysts with intimate interfacial contact via co-precipitation followed by calcination method. Under photothermal conditions, CuZnO underwent in situ reconstruction into low-coordinated metallic Cu in close contact with ZnO, delivering a CO generation rate of ∼18.1 mmol g −1 h −1 with a selectivity as high as 99% at 200 °C, outperforming that achieved under purely thermal conditions. Operando photothermal X-ray absorption fine structure (XAFS) spectroscopy revealed the real-time evolution of both Cu and Zn coordination environments in CuZnO, illustrating the formation and stabilization of metallic Cu on ZnO during photothermal catalysis. This study elucidates the mechanisms underlying photothermal synergy in CO 2 reduction and provides mechanistic insights into active-site dynamics under photothermal conditions.
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