SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Chao-Ying Gao,Yang Li,Wenbo Wang,Chenyu Liu,Jinghai Liu,Yang Yang
Developing heterogeneous catalysts capable of activating inert CO 2 under mild conditions remains a central challenge in sustainable chemistry. Herein, we report the rational design of a robust bimetallic platform, MOF-253-0.5(Cu/Ag), constructed by post-synthetic incorporation of synergistic Cu(II) and Ag(I) sites within the 2,2′-bipyridine pockets of the MOF-253 framework. The catalyst exhibits high turnover frequencies (TOF) of 260 h −1 under ambient conditions, ranking among the highest reports. It also maintains robust stability over 5 cycles, achieving a cumulative turnover number (TON) of 999.2. Even under diluted CO 2 conditions mimicking industrial flue gas, its catalytical activity remains largely unaffected. 1 H NMR mechanistic analysis was used to monitor the reaction processes. Comparative experiments with monometallic and pristine MOF confirm the superior performance of the bimetallic system, attributed to Cu/Ag synergy that activates both the C≡C bond and CO 2 . Furthermore, comprehensive density functional theory (DFT) calculations provided clear insights into the energetics and elementary steps of the catalytic cycles. This work highlights the power of site-isolated bimetallic MOFs in CO 2 chemical fixation.
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DOI
高影响因子
MINERALS ENGINEERING
·
2026
·
IF 5
Yunzhen Hu,Kangjing Wu,Shuai Wang,Zhanfang Cao,Xin Ma,Hong Zhong
The flotation separation of chalcopyrite and galena remains challenging due to their similar surface properties. Here, we demonstrate that H 2 O 2 pretreatment passivates Cu sites (forming Cu–O) while activating Pb sites (forming Pb–O) on mineral surfaces, which transforms sodium 2-(dithiocarboxylato)ethyl acetate (DTCA) from non-selective into a galena-selective depressant. Micro-flotation experiments indicate that with H 2 O 2 oxidation duration of 30 min, pH of 10, and DTCA dosage of 100 mg/g, galena recovery can be reduced to below 5% while maintaining chalcopyrite recovery above 90%. Following oxidation, the adsorption amount of chalcopyrite decreased from 96.54 to 7 mg/g, while that of galena increased from 101.32 to 102.45 mg/g. Multiscale characterizations (FTIR, XPS, ToF-SIMS) indicate that DTCA adsorbs onto the surfaces of chalcopyrite and galena, respectively, via chelation between S–Cu–S and S–Pb–S bonds. Density functional theory (DFT) calculations confirm that oxidation enhanced the adsorption strength of DTCA on the surface of galena, with the adsorption energy shifting from −2.571 to −2.645 eV. Conversely, adsorption strength decreased significantly after oxidation of chalcopyrite, with the adsorption energy shifting from −2.470 to −1.588 eV. Closed-circuit tests on industrial concentrates yielded copper recovery and grade reached 93.13% and 27.43%, respectively, while lead achieved 96.33% recovery and 43.21% grade, with a separation index (SI) of 2.55, surpassing that achieved by the toxic potassium dichromate(K 2 Cr 2 O 7 ) method. This study proposes a Cr (VI)-free flotation strategy for efficient Cu–Pb separation, offering a promising alternative to conventional environmentally hazardous methods.
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DOI
高影响因子
Nature Energy
·
2026
·
IF 60.1
Zhang Shaochen,Bi Enbing,Lei Borui,Tian Liuwen,Miao Xiaohe,Lian Chongyan,Wang Xiaonan,Zhang Xu,Jin Donger,Zhou Jingjing,Tian Yuan,Fan Wei,Chu Shenglong,Liu Qingqing,Gui Yang,Guo Tie,Wang Rui,Yang Deren,Xue Jingjing
Perovskite/Cu(In,Ga)Se 2 (CIGS) tandem solar cells hold particular promise for flexible and lightweight applications, yet their efficiency still lags behind other perovskite-based tandem architectures. To achieve optimal spectral matching with the CIGS bottom cell, the perovskite top cell requires a wide bandgap, obtainable with a mixed-halide composition with high bromide content. However, perovskite films made with high bromide content suffer from inhomogeneous halide distribution, especially for scalable film fabrication method. Here we use 2-pyrrolidinone as the coordinating solvent to suppress the crystallization of the halide intermediates, maintaining a homogeneous halide distribution during ambient blade-coating of the perovskite film. We demonstrate a flexible monolithic two-terminal perovskite/CIGS tandem cell with a power conversion efficiency of 27.3%, with minimal efficiency loss over 500 h of operation.
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高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.5
Wensong Wang,Ying Tian,Xiuwen Cao,Xiang Liu,Shizhe Cao,Deheng Chen,Weizi Jiang,Mingtao Li,Weiwei Lin,Xun Sun,Shenjie Li,Yanyan Chen
The urea oxidation reaction (UOR), with its low theoretical potential, can replace the oxygen evolution reaction (OER) at the anode in water electrolysis, thereby reducing the thermodynamic barrier of electrochemical water splitting. However, in practical UOR electrocatalysts, the adsorption competition between urea and OH⁻ constitutes a kinetic bottleneck. Conventional catalysts lack dynamic regulation means, which ultimately leads to the occurrence of competitive adsorption. In this study, we constructed a CuxS/FeS/NF heterojunction electrocatalyst via hydrothermal methods, achieving highly efficient catalysis for UOR-assisted overall water splitting. The heterojunction features an open and disordered hierarchical porous structure, significantly increasing the specific surface area and active site density (with a double-layer capacitance of 8.33 mF cm -2 ). More importantly, the reversible Cu + /Cu 2+ valence cycling on the heterojunction surface dynamically modulates urea adsorption sites, addressing the issue of OH -occupying active centers and accelerating reaction kinetics (Tafel slope as low as 26.28 mV dec -1 ). In-situ Raman tests confirm that Cu 2+ forms strong coordination with -NH₂ via empty orbitals, while Cu + weakens the adsorption of OH⁻ through high electron density; the two species synergistically accelerate the reaction kinetics. Electrochemical tests reveal that in the UOR||HER system, CuxS/FeS/NF only requires a potential of 1.35 V vs. RHE to achieve a current density of 10 mA cm -2 , while for the HER, it needs merely 78 mV to reach the same current density. When applied to UOR-assisted overall water splitting in a 1 M KOH + 0.33 M urea electrolyte, the system requires only 1.440 V vs. RHE cell voltage to deliver a current density of 50 mA cm -2 and maintains stable operation for 60 hours, with a urea degradation rate of 66.4% after 20 hours. This work, through the dynamic regulation mechanism of copper valence cycling, provides a novel approach for designing UOR catalysts with both high activity and stability, holding significant application potential in low-energy hydrogen production and wastewater treatment.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.7
Weixiang Chen,Yuxiong Wang,Yaoyu Zhang,Yue Liu,Zhongbiao Wu
Ammonia (NH 3 ) has emerged as a promising zero‑carbon energy source for energy and transportation. However, its utilization leads to the emission of NH 3 , which contributes to PM 2.5 formation and disrupts the global nitrogen cycle. Selective catalytic oxidation (SCO) represents a mainstream technology for NH 3 treatment, yet achieving both sufficient activity and high N 2 selectivity across a broad temperature window remains challenging. Here, a core-shell Pt@Cu-ZSM-5 catalyst was employed for NH 3 catalytic abatement by encapsulating metallic Pt clusters (Pt 0 ) inside the channels of Cu ion-exchanged ZSM-5. The optimal sample achieved a complete NH 3 conversion below 250 °C and maintained over 92% N 2 selectivity from 250 to 500 °C due to the synergism between the Pt Cu dual sites. Mechanistic studies revealed that NH 3 oxidation preferentially occurred on Pt 0 sites with excellent redox capacity to produce N 2 O and NO x at relatively low and high temperatures, respectively. And the presence of Cu ions (Cu δ+ ) could efficiently both inhibit the formation of N 2 O on Pt 0 sites and reduce NO x emission, thereby improving the N 2 selectivity. At relatively low temperatures, NH 3 -solvated Cu + (NH 3 ) 2 could migrate to the adjacent Pt sites and reduce the adsorbed NO* species from NH 3 oxidation, damping the formation of N 2 O. At high temperatures, the NO and NO 2 emitted from Pt 0 sites could be reduced on Cu δ+ sites via a typical selective catalytic reduction. This study provides new insights into the rational design of bifunctional SCO catalysts and offers a comprehensive understanding of the synergistic effects in Pt Cu dual-site systems.
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PubMed
高影响因子
Molecular Catalysis
·
2026
·
IF 4.9
Mingsheng Luo,Xiaoteng Cui,Yuanyuan Fang,Changke Shao,Roshni Rahman,Lingxin Chen,Hao Sun,Minwei Yi,Yutong Liu,Yiduo Huo,Zihan Xu
CO 2 -to-methanol is a promising process for carbon utilization to produce sustainable fuel and chemicals. Catalytic performance of Cu-based Layered Double Hydroxide (LDH)-derived catalysts for CO 2 hydrogenation to produce methanol was investigated in this work. Various secondary metallic components, Al, Ga, Cr, In, Sm and La were employed to prepare a series of Me-Cu/LDH type of catalyst for CO 2 -to-methanol reaction. The catalysts were synthesized using a co-precipitation method, followed by calcination and reduction activation. Impact of the secondary metals on the structure of the prepared catalyst and their reaction performance was studied in fixed-bed reactor. The CO₂ hydrogenation activity and methanol selectivity of the prepared LDO catalyst were evaluated at 3.0 MPa and a gas hourly space velocity (GHSV) of 3.6 L·g⁻¹·h⁻¹, using a CO₂/H₂ ratio of 3. Synthesis conditions, including temperature and aging time, significantly affected the catalyst structural properties and catalytic performance. The results showed that the CuAl catalyst yielded the highest CO 2 conversion up to 20%, while the CuIn catalyst generated the highest methanol selectivity above 74%. It can be reasonably proposed that the highly dispersed copper active sites in the CuAl catalyts contributed to the improved CO 2 conversion, whereas the high concentration of oxygen vacancies in the CuIn catalyst promoted methanol formation. Furthermore, these catalysts showed good stability with no noticeable carbon deposition. These findings highlight the potential of LDH-based catalysts in CO 2 hydrogenation and provide valuable insights for optimizing their structure and composition to enhance catalytic efficiency.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 24
·52228-52239
·
IF 5.1
Dongjiang Wu,Weijie Lv,Zheng Li,Xuexin Yu,Cong Zhou,Bi Zhang,Wei Wang,Huanyue Zhang,Guangyi Ma,Fangyong Niu
High-entropy oxides (HEOs) have attracted extensive research interest due to their unique structural features, customizable elemental compositions, and tunable functional properties. Nevertheless, the complexity, low efficiency, and high cost of the existing HEO synthesis methods place limitations on them. In this study, Laser directed energy deposition (LDED) was employed to synthesize (Mg, Co, Ni, Cu, Zn)O oxides. Additionally, the novelty of applying the LDED process to multicationic systems was emphasized. The comparison between specimens fabricated from mixed powder via LDED(MP) and those fabricated from pre-sintered powder via LDED(SP) encompasses macroscopic morphology, microstructure, and performance. The results showed that SP significantly enhanced the density from 86.44 % to 96.70 % compared to MP. The macro-segregation of Cu and Cu 2 O in the phase composition was observed in MP and SP. High-temperature pre-sintering promoted the solid solution formation of Co and Ni during LDED, leading to more severe micro-segregation of Co and Ni. When employed as anodes in lithium-ion batteries, MP and SP have outstanding long-term cycle stability, according to electrochemical performance studies. At a current density of 100 mAg −1 , these specimens maintained a capacity retention rate of 100 % even after 200 cycles. The initial discharge capacities of MP and SP were respectively 477.73 mAh g −1 and 373.86 mAh g −1 . This study is expected to present a novel approach for the rapid synthesis of (Mg, Co, Ni, Cu, Zn)O oxide ceramics .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Weidong Zhang,Qizhi Dong,Haozi Lu,Bonian Hu,Yong Xie,Gang Yu
Three-dimensional (3D) network structure nanomaterials (NMs) show excellent catalytic performance due to the larger active surface area. A glucose-directed, surfactant-free and one-step direct chemical co-reduction method for synthesis of Pt-Cu alloy nanowires (NWs) under room temperature was demonstrated in present paper. The Pt-Cu NWs were obtained through the co-reduced of CuCl 2 and H 2 PtCl 6 by sodium borohydride in the presence of glucose, the glucose in which not only acted as one-dimensional (1D) growth-directing agent, also as the stabilizing agent. The average diameter of NWs was about 3.1 nm and NWs showed typical face-centered-cubic (fcc) alloy crystal structure. The influence of Pt/Cu ions ratios in precursor solution on the bimetallic composition of NWs had been studied, and NWs displayed the feature of composition-tuning. The electro-catalytic activity of Pt-Cu alloy NWs for ethylene glycol oxidation reaction (EGOR) in alkaline medium was strongly related on their compositions. The Pt 31 Cu 69 NWs exhibited about 1.8 times higher than that of commercial Pt/C and higher durability. The enhanced catalytic performance of Pt-Cu alloy NWs was mainly attributed to their unique 3D network structure and the synergetic effects between Pt and Cu.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Huicai Xie,Quanyi Liu,Xiaohua Luo,Shengcan Ma,Xinqiang Gao,Zhenxing Li,Zhaojun Mo,Jun Shen
For more practical applications, research on magnetic refrigeration has been gradually focused on developing refrigerants with large magnetocaloric effect (MCE) under low magnetic fields (≤2 T). EuTiO 3 exhibits considerable low-field MCE near ordering temperature, meanwhile the magnetic switch from antiferromagnetic to ferromagnetic (AFM-FM) in it provides the feasibility of improving the magnetocaloric performance. In this study, a series of Eu(Ti,Nb,M)O 3 (M=Cu or Zn) compounds were synthesized, and the crystal structure, magnetic properties together with cryogenic MCEs were investigated in detail. The co-substitution contributes to an FM coupling domination in all the compounds. Besides, significantly enhanced and giant low-field MCEs were detected in these compounds. Under the field change of 1 T, all the samples possess remarkable magnetic entropy change (>15 J·kg -1 ·K -1 ) around 5 K without hysteresis. The corresponding refrigerating capacities are calculated to be 68.0, 72.6, 76.0, and 69.6 J·kg -1 , respectively, exhibiting an increase of 149–178% than EuTiO 3 . The outstanding magnetocaloric performances make the Eu(Ti,Nb,M)O 3 (M=Cu or Zn) compounds competitive candidates for cryogenic magnetic refrigeration.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
低温工程
·
磁学
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高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Xiao Yang,Minjian Ma,Chunming Xu,Rongzheng Ren,Jinshuo Qiao,Wang Sun,Kening Sun,Zhenhua Wang
Hybrid direct carbon fuel cells (HDCFCs) present its inherent and unparalleled advantages in converting chemical energy from organic waste, biomass, and coal directly into clean energy with high efficiency. However, the progress of HDCFC technology continues to be hampered by the sluggish anode reaction kinetics. Herein, an effective design strategy for HDCFC anode is proposed, a Cu-modified Sr 2 Fe 1.3 Cu 0.2 Mo 0.5 O 6-δ (SFCM) perovskite oxide is developed to meet the requirements of intermediate-temperature HDCFC anode. The Cu-doping SFCM anode demonstrates excellent redox structural stability and catalytic activity. In addition, the electrolyte-supported single cell with Cu-doping SFCM anode has improved the peak power density from 285.5 mW cm −2 to 489.3 mW cm −2 at 800 °C with activated carbon as the fuel. The significantly enhanced anode catalytic activity is primarily due to the improved interfacial activity and chemical adsorption of CO. Therefore, the present work shows an effective strategy for designing and developing novel high-performance HDCFCs anode materials .
研究领域:
能源材料
·
电化学
·
燃料电池
·
功能材料
·
催化化学
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 81
·77358-77365
·
IF 3.289
Ting-Ting Li,Jinjie Qian,Yue-Qing Zheng
Metal–organic frameworks (MOFs) have been demonstrated as suitable metal sources and sacrificial templates for the preparation of porous transition-metal oxide nanomaterials. Herein, porous CuO micro-polyhedra assembled from numerous nanoparticles are synthesized simply by employing a Cu-based MOF as a precursor via a one-step calcination process under an air atmosphere. Benefitting from their high porosity and large specific surface area, porous CuO materials exhibit excellent electrocatalytic performances toward water oxidation in pH 9.2 KBi solution. A low catalytic onset potential at 1.05 V vs. NHE (NHE = normal hydrogen electrode) is obtained based on electrochemical measurements. A faradaic efficiency of nearly 98% and a stable catalytic current density of 2.2 mA cm−2 are achieved under an applied potential of 1.30 V vs. NHE over an electrolysis period of 10 h. In addition, based on the Tafel plot, the required overpotentials are only ∼410 mV and ∼510 mV for achieving the catalytic current densities of 0.1 mA cm−2 and 1.0 mA cm−2, respectively. The excellent performances make it an appealing candidate as a potential catalyst for green energy applications.
研究领域:
材料化学
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电化学
·
纳米材料
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能源催化
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无机功能材料
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 85
·81767-81773
·
IF 3.289
Jiaxun Hu,Shuqing Wu,Qin Cao,Wenda Zhang
A facile approach was developed to synthesize core–shell structured alumina/Cu microspheres by means of activation by silver nanoparticles in situ deposited on the polydopamine-coated alumina microsphere surface. This approach takes advantage of both the sufficient reductive capacity of polydopamine towards silver ions and the high activation of silver nanoparticles towards copper deposition. The chemical compositions of composite microspheres were characterized by energy dispersive X-ray spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR). The surface morphologies and crystalline structures of the coated alumina were studied by field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD), respectively. The adhesion strength between the copper layer and the substrate was evaluated by ultrasonic exposure and thermal shock test. The results showed that silver nanoparticles effectively catalyzed the copper deposition reaction on the polydopamine-coated surface, which led to a faster and more reliable plating process compared with the process without activation. The compact and continuous copper layer obtained showed strong adhesion on the substrate surface.
研究领域:
材料科学
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纳米技术
·
表面工程
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复合材料
·
功能材料
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高影响因子
危险品化学品经营许可证（带存储）