MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Dan Huang,Ling Li,Siqi Wei,Kaixi Yin,Wenjuan Shang,Xiandeng Hou,Li Wu
Heterogeneous bimetallic materials have attracted widespread concern in surface-enhanced Raman scattering (SERS) since the interactive coupling between these heterogeneous zones produces a synergistic enhancement effect. Developing a quick and easy method to prepapre bimetallic materials with superior SERS properties is therefore very important. A novel approach of electrodeposition followed by the galvanic replacement reaction (GRR) was proposed for fast fabricating copper-silver bimetallic heterogeneous dendrites on nickel foam (Cu-Ag dendrites@NF) as a stable SERS substrate. The morphology and compositions of the dendritic structure were well characterized by SEM, and XPS imaging provided a micro-area composition analysis. The metallic Cu-Ag dendrites exhibited better SERS enhancement performance than the pure metal, with an enhancement factor of 37 times that of the pure Ag cubes@NF, and 6 times that of the Ag dendrites@NF. The reason is that both the synergistic effect of plasmon coupling from bimetal Cu-Ag and the dendritic structure with large surface area and cusps contributed to electromagnetic enhancement. The substrate was successfully used for the detection of pesticide thiram, dye molecule crystal violet (CV), and toxic aromatic amines p-Aminoazobenzene (pAAB), with limits of detection (LODs) down to 10 −8 M, 10 −9 M, and 10 −8 M, respectively. This method provides a novel fast approach to fabricate a bimetallic substrate with high SERS activity, and may have broad applications in food analysis and environment monitoring.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Xuan Luo,Luhan Wang,Meng Tian,Yi Tian,Xiao Zhang,Shijie Zhou,Jun Xie,Linlin Hu
O3-type layered oxides are considered ideal cathode materials for sodium-ion batteries (SIBs) owing to their high theoretical capacities, but these materials undergo complex phase transitions during the Na + extraction and insertion, resulting in serious structural degradation and reduced cycling stability. Herein, we employ “Cu/Mg co-doping strategy” to synthesize a stable O3-type layered transition metal oxide NaNi 0.25 Cu 0.1 Mg 0.05 Fe 0.2 Mn 0.4 O 2 (NaNCMFMO) with excellent structural reversibility. The resulting NaNCMFMO achieves reversible specific capacity of 123 mAh g −1 at 0.1 C and remarkable improvement in capacity retention of 79.4 % over 300 cycles at 1.0 C, compared to the pristine NaNi 0.4 Fe 0.2 Mn 0.4 O 2 cathode (42.1 % retention after 300 cycles). Additionally, ex situ X-ray diffraction pattern of NaNCMFMO indicates a highly reversible phase evolution of O3-P3-O3 during charge/discharge cycles, and GITT measurements reveal faster Na + diffusion kinetics. Moreover, a NaNCMFMO//hard carbon full-cell battery exhibits superior electrochemical performance: a high reversible specific capacity of 105.1 mAh g −1 at 1.0 C and capacity retention of 81.1 % over 200 cycles. This work presents a facile and effective strategy to suppress structural degradation in O3-type layered cathodes materials of high-performance SIBs.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Huixian Weng,Danyang Liu,Shujiang Geng,Gang Chen,Fuhui Wang
Cu/Ni dual-layer coating is applied to improve the performance of SUS 430 steel as solid oxide fuel cells (SOFCs) interconnects. Cu layer is deposited by electroplating, followed by magnetron sputtering Ni layer on top of Cu layer. The coated steels are evaluated in air at 800 °C in correspondence with SOFC cathode environment. Results showed that a considerable amount of Ni diffuses into the steel substrate, while Fe and Cr diffuse from the steel substrate into the coating during the initial oxidation. A (Ni,Fe) 3 O 4 spinel layer is initially formed on the scale surface. Cu diffuses outwards and eventually dopes into (Ni,Fe) 3 O 4 spinel to form (Ni,Fe,Cu) 3 O 4 spinel. The oxide scale evolved into a dual-layer structure of an inner Cr 2 O 3 layer and an outer layer of NiO mixed with spinels after 5 weeks of oxidation. Preoxidation treatment in 800 °C air for electroplated Cu coated steel prior to depositing Ni layer improves oxidation resistance and significantly decreases Cr outward diffusion after 5 weeks of oxidation. Moreover, the oxide scales formed on both Cu/Ni and CuO/Ni coated steels maintain low area specific resistance (ASR) after 5 weeks of oxidation.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Xiahua Zhong,Linghan Li,Chunyan Li,Xin Mu,Anni Cui,Guiye Shan
The development of cuprous oxide (Cu 2 O) photocathode for photoelectrochemical (PEC) water splitting confronts charge recombination and photocorrosion. Herein, a facile strategy for wrapping Cu 2 O photocathode with Cu ions intercalated graphene oxide (Cu-GO) was proposed to realize efficient PEC water splitting. The intercalating GO with Cu ions could reduce the bandgap and enhance the carrier mobility of Cu-GO. The as-formed Cu-GO could suppress surface charge recombination and accumulation of the Cu-GO/Cu 2 O photocathode by improving the interfacial charge transfer, which strengthens electron extraction and restrains photocorrosion. The Cu-GO/Cu 2 O photocathode achieved a high photocurrent density of − 7.03 mA cm −2 (at 0 V vs. RHE) under AM 1.5 G illumination and excellent photostability for PEC water splitting. This work provides a simple way to design Cu 2 O-based photocathodes with reliable charge transfer layers for efficient PEC water splitting.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2021
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IF 6.291
Xiaotian Zhou,Qilu Wang,Yuanming Guo,Xiumei Sun,Tiejun Li,Chenghu Yang
Dissolved organic matter (DOM) from macroalgae is regarded a crucial source of autochthonous DOM in coastal ocean. In the present study, the characteristics of DOM from the macroalgae Ulva pertusa decomposition ( U. pertusa -DOM) and its binding behaviors with Cu(II) using multiple spectroscopic techniques and chemometric analyses. The labile U. pertusa -DOM could be consumed and transformed by microorganisms. The absorption spectroscopic descriptors indicate that the hydrophobicity, aromaticity, and molecular weight of the U. pertusa -DOM increase during the 27-day incubation period. Fluorescence excitation–emission matrix spectroscopy combined with parallel factor analysis suggests that the relative abundance of the protein-like component (C1) (96.10–84.96%) sequentially decreases, whereas the humic-like components (C2) (2.16–9.73%) and (C3) (1.75–5.31%) in the U. pertusa -DOM increase with the U. pertusa decomposition. The Cu(II) binding properties of the U. pertusa -DOM are dependent on the decomposition time. The order of the conditional stability constant (log K M ) is C2 > C1 > C3. The complexation capacity ( f ) of C1 is higher than those of C2 and C3 at a specific time. Synchronous fluorescence spectroscopy coupled with two-dimensional correlation spectroscopy reveals that the microbial degradation could accelerate the Cu(II) binding to humic-like fractions in the U. pertusa -DOM. These findings will help us better understand the biogeochemical behaviors of macroalgal DOM and heavy metal in coastal ecosystems.
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高影响因子
Talanta Open
·
2022
·
IF 0
Jinping Yue,Qing Lv,Wan Wang,Qing Zhang
In this work, a new paper-based device (PAD) was developed for the colorimetric detection of multiple heavy metals. The sensing principle of this PAD is based on the analyte-regulated photocatalytic activity of quantum dots (QDs) to certain substrates. The PAD consisted of three filter paper layers, defining a sample area, three channels, and three testing areas. Three photocatalytic reactions between different QDs and their corresponding substrates could be performed in one device, achieving the simultaneous detection of Cu(II), Mn(II), and Hg(II). The detection limits are 7.3 nM for Cu(II), 5.4 nM for Mn(II), and 8.1 nM for Hg(II), respectively. This PAD was applied to analyze real samples and the results were consistent with those obtained by inductively coupled plasma-optical emission spectrometer. This approach may provide a promising colorimetric sensing platform for multi-target analysis.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Ruyi Wang,Xianfeng Liu,Fu Yang,Shuying Gao,Shijian Zhou,Yan Kong
Herein, we report an efficient controlled approach to reach the synergetic neighboring dual-metal active sites in the confined mesopore of silica. In this approach, Mn-bearing mesoporous molecular sieve was designed in advance via a metal-assisted in-situ assembly route and further employed as a starting carrier to accommodate more extraneous Cu by impregnation. Controlling copper loading (Cu/Mn = 0.2, 0.4, and 0.6), comparative catalysts were attained and precisely characterized by key physicochemical methods. Impressively, in-situ formed highly-dispersed MnO x covered on the mesopore become the prerequisite for producing interplayed active species with neighboring dual Cu-Mn sites. Catalytic results concerning styrene epoxidation together with DRIFTS experiments and calculated bond energy variation in expected reaction intermediates demonstrated the existed synergy derived from formed neighboring Cu-Mn species via weakening and reinforcing appointed chemical bonds in intermediates. This study provides the foreseeable possibility for attaining universal synergetic catalysts in industrial heterogeneous catalysis.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2022
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IF 3.656
Zhongjia Wu,Junlun Zhu,Wei Wen,Xiuhua Zhang,Shengfu Wang
4-Nitrophenol (4-NP) is water pollutant with good stability, high toxicity and difficult degradation, which will cause great harm to the environment. Thus, the development of high efficiency and rapid catalysts for the degradation of 4-NP will be an urgent problem to be solved. Herein, we synthesized covalent organic framework supporting Cu/Ag bimetallic nanoparticles (Cu/Ag–COF), which had better catalytic activity for the reduction of 4-NP. The porous COF possess large surface area of approximately 737.8 m 2 /g, so it can provide abundant sites for loading metal nanoparticles . At the same time, COF could also improve the stability and catalytic effect of nanocatalyst under flexible condition. The prepared Cu/Ag–COF exhibited the higher catalytic reduction of 4-NP into 4-aminophenol (4-AP) under the condition that the molar ratio of NaBH 4 to 4-NP was 147 and achieved an apparent rate constant of k Cu/Ag – COF = 0.0073 s −1 . The apparent rate constant of Cu/Ag–COF was higher than that of Ag–COF ( k Ag-COF = 0.0032 s −1 ) and Cu–COF ( k Cu-COF = 0.0047 s −1 ), indicating that this system had a synergistic catalytic effect to improve the catalytic activity of metal nanoparticles . Moreover, Cu/Ag–COF still had good catalytic effect after eight cycles, which indicated that it had good stability and reusability. This work provides a novel strategy to fabricate COF supported nanoparticles for outstanding performance in treating wastewater containing 4-NP.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
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IF 4.889
Lu Long,Kaiji Xu,Kok Bing Tan,Dongren Cai,Yucheng Yang,Shu-Feng Zhou,Guowu Zhan
Catalytically agitating paddles are essential to perform liquid-solid heterogeneous catalytic reactions on an industrial scale due to the improved mass transfer and easy catalyst recovery. Herein, bimetallic oxides were formed after the calcination of nanomaterials derived from metal-organic frameworks (MOFs). Particularly, Mn(M)-BTC nanomaterials were synthesized by self-assembly of Mn 2+ ions (mixed with various dopants such as Cu 2+ , Ce 3+ , or Fe 2+ ) and H 3 BTC ligands in a mixed solvent of ethanol and water. It was found that in the powdery form, the Mn-Cu oxide derivate exhibited the highest degradation rate in the catalytic wet peroxide oxidation process (CWPO process), which was significantly higher than that of single metal oxide as well as Mn-Fe and Mn-Ce oxide derivates. The reason was caused by the synergistic effect between Mn-Cu promoted the formation of Mn 3+ and Cu + species to boost the CWPO reaction. Furthermore, the obtained Mn-Cu powdery catalysts were 3D-printed to obtain monolithic agitating paddles with different geometries, which were then mounted on a central shaft in the stirred reactor. An advanced oxidation process was used to investigate the effect of 3D patterns on the degradation efficiency of various organic dyes. It was discovered that the 3D-printed grid with higher cell density (484 cpsi) had better liquid mixing efficiency and thus better catalytic performance, which could be repeatedly used more than seven times. Additionally, the numerical simulation analysis (computational fluid dynamics) revealed a good mixing efficiency and improved mass transfer in the entire reactor equipped with the designed monolithic agitating impellers.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Yingying Yin,Lei Zhu,Tianchao Guo,Xurong Qiao,Shaopeng Gan,Xiao Chang,Xiaofang Li,Fujun Xia,Qingzhong Xue
The development of efficient oil/water separation membranes is highly significant for reducing severe environmental pollution nowadays. Constructing hierarchical structures with double-scale roughness and inverted trapezoidal geometry is an alternative rational design to fabricate low oil-adhesive membranes. Based on this design concept, a Cu mesh vertically wrapped with novel microphone-like Cu-CAT-1 hierarchical microstructures with double-scale roughness was tactfully prepared by a local concentration effect, which was referred to as CCMOF. The CCMOF possessed superior anti-oil-fouling performance and an outstanding water-absorbing capacity (180.3% larger than that of the pristine Cu mesh) due to its ingenious microphone-like structures and its high affinity for water. Therefore, it could separate various types of oil/water mixtures with a considerably high flux of over 25,000 L m −2 h −1 and an extremely low oil content in filtrate of below 10 ppm. The design concept of this work offered a simple idea to design low oil-adhesive membranes for efficient oil/water separation.
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ChemCatChem
·
2020
·Vol. 12
·期 10
·2745-2751
·
IF 4.853
Xinyang Guo,Fei Xue,Shikai Xu,Shaohua Shen,Hongwen Huang,Maochang Liu
Graphical How do you wave ? In this work, we realized the coupling of localized photothermal effect into a cocatalytic material by developing a unique core-shell Cu@Ni nanoplate cocatalyst for efficient photocatalytic H 2 production from water. Specifically, Cu nanoplate could induce localized hot spots on Ni nanoparticles via a visible-light-driven surface plasma resonance effect. As a result, photogenerated electrons transferred from g-C 3 N 4 to Ni, could be elevated to a more energetic state, leading to a substantially improved photocatalytic activity. The general moderate reaction condition in solar photocatalytic hydrogen production (i. e., near ambient pressure, room temperature) makes interfacial mass and energy transfer extremely slow, even by employing a cocatalytic material (usually in the form of noble metal nanoparticles or their counterparts). Herein, by fabricating well-defined Cu@Ni core-shell nanoplate cocatalyst and further incorporating it with a g-C 3 N 4 photocatalyst, we demonstrate that interfacial processes could be significantly improved by coupling localized photothermal effect into a cocatalyst. Specifically, Cu nanoplate can induce localized strong hot spots on Ni nanoparticles via a visible-light-driven surface plasma resonance effect. As a result, photogenerated electrons transferred from g-C 3 N 4 to Ni, could be elevated to a more energetic state, leading to a substantially improved photocatalytic activity toward H 2 evolution from water. The highest hydrogen generation rate reaches 55 μmol h −1 g −1 , 110 times of that pristine g-C 3 N 4 . This work indicates that photoelectric and photothermal effects can be effectively coupled by integrating metal hetero-nanoparticles.
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JOURNAL OF CATALYSIS
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2020
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IF 7.888
Zhe Xu,Tiancheng Wu,Yu Cao,Congcong Chen,Xierong Zeng,Peng Lin,Wei-Wei Zhao
Production of multi-carbon (C 2+ ) products via electrochemical CO 2 reduction reaction (CO 2 RR) has aroused intensive interest in this decade. However, it is still a great challenge in large-scale synthesis of electrocatalysts for C 2+ compounds production with high selectivity and rate in neutral electrolyte. In this study, a robust and scalable aqueous synthesis method was proposed to prepare CuO nanosheets, which was directly used as CO 2 RR electrocatalyst. The catalyst underwent dynamic restructuring during the pre-reduction stage, which significantly changed the morphology, crystalline structure and electrochemical properties of the catalyst. As a result, the pristine CuO nanosheets gradually evolved to coral-like Cu nanoparticle ensembles (CL-Cu NEs). In 0.1 M KHCO 3 at −1.1 V vs. RHE, the CL-Cu NEs exhibited a faradaic efficiency and partial current density of C 2+ products of 72.1% and 25.2 mA cm −2 respectively and no degradation was observed in 15 h running. In contrast to many Cu-based catalysts showing considerable C 2+ products selectivity, the (sub)surface oxygen and Cu + species were unlikely to play a significant role in this study. The strong performance of CL-Cu NEs was ascribed to the synergism between the coral-like morphology and abundant Cu(1 0 0)/Cu(1 1 1) interfaces. This methodology may provide a cost-effective approach for large-scale preparation of CO 2 RR electrocatalysts with ideal nanostructure.
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