FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2026
·
IF 1.8
Meijun Yang,Yan Xiao,Zhimin Chang,Zhenhui Chen,Takashi Goto,Song Zhang,Rong Tu
Diamond/Cu composites are promising for thermal management but their poor wettability requires carbide coatings for interfacial modification. This work proposes a novel magnesiothermic reduction method for synthesizing TiC @diamond at low temperatures utilizing a MgCl2–KCl molten salt system with TiO2 as the Ti source. An ∼325 nm TiC coating forms on diamond at 750 °C for 2 hours without graphitization. Interfacial analysis shows a semi-coherent interface with specific crystallographic orientations ([110] TiC // [110] diamond, (1 − 1−1) TiC // (1 − 1−1) diamond). The TiC @diamond/Cu composite shows optimal performance: thermal conductivity (TC) of 689 W/(m · K), 63% International Annealed Copper Standard electrical conductivity and 98.55% relative density, representing increases of 280.66% in thermal conductivity, 90.91% in conductivity and 8.02% in relative density compared to uncoated composites. Its CTE (Coefficient of Thermal Expansion) at 300 °C drops from 17.98 × 10−6 to 6.92 × 10−6/K, a 61.5% relative reduction, significantly enhancing thermal dimensional stability.
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NANO
·
2026
·
IF 1.3
Zhida Yang,Wenkai Wang,Binbin Gao,Tianzi Xu,Dongxue Zhou,Rongjie Li,Wei Liu,Honglu Liang,Guangsheng Dong,Hongzhi Yuan,Wenjun Dong,Honglin Chen
The Cu@Ag core-shell particles can be employed as conductive phase in conductor paste. Ag shell is designed to protect Cu core from oxidation. To obtain thin, dense and uniform Ag shell on Cu core, a novel electroless Ag plating process for Ag coating is developed. In the process, acacia gum (AG) acts as surfactant and dispersant, manipulating Ag deposition on Cu slowly and accurately. Benefit from the reduction potential difference between Ag and Cu, a thin reduced Ag shell is plated on Cu core with layer growth mode firstly. Then, inhomogeneous surface energy of Ag shell commands its following growth with an island mode. Finally, these Ag islands grow to contact and bond together, resulting in an uniform and dense Ag shell for Cu@Ag. After optimization, the Cu@Ag particle shows excellent oxidation resistant. A mass increase of only 0.5% is observed in it at 300°C. Meanwhile, the Cu@Ag with regular structure also presents remarkable volume conductivity. Over all, the spectacular performance of prepared Cu@Ag powder indicates its promising application in conductive paste.
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高影响因子
ENERGY
·
2026
·
IF 10.1
Dongxue Wu,Bianfeng Yang,Xu Ji,Keqin Huang,Jianjun Wang,Qing Lan
This study synthesized photocatalysts Cu/TiO 2 with various Cu loadings via a simple impregnation method and systematically characterized their structural, morphological, and optical properties. The photocatalytic hydrogen production performance was assessed under both laboratory xenon lamp irradiation and outdoor solar irradiation. The results show that the 3 wt%Cu/TiO 2 catalyst exhibits a reduced band gap of 3.11 eV (compared with 3.34 eV for pure TiO 2 ) and the lowest photogenerated electron-hole recombination rate, thus delivering the optimal catalytic performance. Under xenon lamp irradiation (light intensity of 450 mW cm −2 ) without external temperature control, the Cu/TiO 2 achieved a hydrogen production rate of 23.84 mmol g −1 h −1 . And the 3 wt%Cu/TiO 2 retained 87.13% of the hydrogen production rate after four consecutive 20 h cycles, indicating outstanding stability. However, when the light intensity was reduced to 350 mW cm −2 and the reaction temperature was maintained at 20 °C, the hydrogen production rate of 3 wt%Cu/TiO 2 decreased to 1.01 mmol g −1 h −1 , yet it remained 109 times higher than that of TiO 2 (0.01 mmol g −1 h −1 ). It is evident that increasing the light intensity can significantly enhance the hydrogen production rate of 3 wt%Cu/TiO 2 , whereas decreasing the temperature leads to a sharp decline in the hydrogen production rate. Furthermore, under outdoor solar irradiation (76.9 mW cm −2 ), the 3 wt%Cu/TiO 2 achieved a hydrogen production rate of 1.60 mmol g −1 h −1 . Under concentrated solar irradiation (202 mW cm −2 ), the rate further increased to 5.00 mmol g −1 h −1 .
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JOURNAL OF ORGANIC CHEMISTRY
·
2026
·
IF 3.3
Lu Wang,Yulu Du,Yanrong Zhu,Bing Zhang,Wenhui Wang,Ying Fu,Zhengyin Du
A palladium-catalyzed tandem Heck cyclization of N-(2-iodoaryl)acrylamides with N-methylanilines and ClCF2COONa has been developed for the synthesis of carbamoyl-substituted oxindoles bearing an all-carbon quaternary stereocenter, wherein difluorocarbene serves as the carbonyl source. This method operates under mild conditions, exhibits a broad substrate scope, and features operationally simple and safe procedures. Moreover, it expands the synthetic utility of difluorocarbene-involved domino Heck cyclizations and enables the efficient construction of diverse amide-functionalized molecular architectures containing an all-carbon quaternary center.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Kai Zhu,Zhenmao Zhang,Xinyin Bai,Fangfang Chang,Qing Zhang,Ge Li,Zhengyu Bai
Electrochemical pre-reconstruction creates CuO/Cu 2 O/Cu/CeO 2 @C heterointerfaces. • Carbon confinement stabilizes multivalent Cu interfaces during CO 2 electroreduction. • CeO 2 modulates the electronic structure and interfacial charge distribution of Cu. • Reconstructed interfaces tune the thermodynamics of *CO and *OCCO formation. • Ethanol Faradaic and cathodic energy efficiencies reach 75.6% and 30.9% at −0.9 V vs. RHE. The electrochemical CO 2 reduction reaction (CO 2 RR) to ethanol provides a carbon–neutral route for the sustainable production of value-added chemicals, yet achieving high ethanol selectivity remains challenging. Herein, we report a Ce-containing Cu-based oxide precursor embedded in a carbon framework, which undergoes electrochemical pre-reconstruction to form CuO/Cu 2 O/Cu/CeO 2 @C heterostructure featuring active multi-heterointerfaces. By optimizing the Ce content, the reconstructed catalyst delivers a high ethanol Faradaic efficiency of 75.6% and an energy efficiency of 30.9% at −0.9 V versus the reversible hydrogen electrode in a flow-cell reactor, outperforming most reported Cu-based CO 2 RR electrocatalysts. Comprehensive structural characterizations reveal that the carbon confinement layer mitigates excessive reduction of Cu species and stabilizes the multivalent Cu interfacial environment during CO 2 RR, while CeO 2 modulates the local electronic structure and induces interfacial charge redistribution over Cu sites. In situ characterization combined with theoretical calculations further reveals that interfacial environment modifies the relative thermodynamics of *CO and *OCCO formation. This work provides profound insights into interfacial charge-redistribution-mediated ethanol selectivity and provides a design strategy for high-performance advanced Cu-based CO 2 RR electrocatalysts. Download: Download high-res image (80KB) Download: Download full-size image
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122907
·
IF 7.5
Xiaoyu Ma,Tao Liu,Jiaheng Huang,Jiaqi Zhang,Chengyong Yu,Tianyong Huang
Photocatalytic CO₂ reduction is a promising route for valorizing carbon resources. In liquid-phase systems, TiO 2 suffers from limited CO₂ adsorption, high interfacial charge-transfer resistance, and rapid carrier recombination. These drawbacks hinder simultaneous improvements in efficiency and selectivity. We fabricated a TiO 2 /UiO-66/Cu ternary photocatalyst using a modified-then-loaded strategy. Amino-functionalized TiO 2 was chemically anchored to UiO-66 via N–Zr coordination, forming a robust, low-resistance TiO 2 /MOF interface while preserving the CO₂-enrichment pores of UiO-66. Cu nanoparticles were then introduced as electron traps and catalytic sites to extract photogenerated electrons from the recombination-prone Type-I heterojunction, enabling directional electron utilization. In a solid–liquid system using water as the proton source, the optimal TiO 2 /UiO-66/Cu produced 86.76 μmol·g⁻¹ CO and 9.08 μmol·g⁻¹ CH 4 after 4 h of UV–visible irradiation. The CO production rate was 7.4- and 3.8-fold higher than that of pristine TiO 2 and UiO-66, respectively. Characterization shows that N–Zr coordination reduces charge-transfer resistance, UiO-66 enriches CO₂, and Cu promotes electron capture. Together, these effects mitigate the intrinsically poor charge separation of Type-I heterojunctions and enable efficient CO 2 photoreduction. The results provide design and mechanistic insights for MOF-enabled TiO 2 composite photocatalysts.
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Nature Communications
·
2026
·
IF 18.1
Qingqing Zhang,Cong Liu,Chang Xu,Dingnan Huang,Cheng Xie,Zhandong Wang,Xiao-Ming Cao,Jinlong Zhang,Juying Lei,Ziwei Ye,Lingzhi Wang
Upgrading light alkanes to value-added olefins is a long-standing challenge, owing to the high stability of C–H bonds and the tendency for overoxidation at elevated temperatures. Here, we introduce a light-driven strategy for ethane dehydrogenation using Cu-doped TiO 2 , in which atomically dispersed Cu coordinated to bridging oxygen (O br–Cu ) creates well-defined [Cu–O] ensembles that orchestrate site-specific, stepwise C–H activation. Photogenerated holes localize at O br–Cu sites to initiate the first C–H cleavage, while adjacent Cu centers mediate β–H elimination and H 2 evolution. In contrast, minor β–H activation at O br–Ti sites generates *H species that cannot desorb due to a prohibitive coupling barrier with *H on O br–Cu , leading to Cu reduction and progressive deactivation. Co-feeding CO 2 restores the active Cu coordination environment and suppresses this deactivation process without perturbing the primary reaction pathway. This cooperative design achieves a C 2 H 4 production rate of 21.1 mmol g −1 h −1 with nearly stoichiometric H 2 evolution and an apparent quantum efficiency of 6.1% under 365 nm irradiation. These findings establish a site-defined, hydrogen-conserving route for photocatalytic alkane upgrading, offering a general blueprint for selective C–H bond transformations with long-term stability. Converting light alkanes into useful olefins is hard because strong bonds and heat drive overoxidation. This study uses a copper-doped titanium dioxide photocatalyst to steer bond breaking, yielding ethylene and hydrogen.
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高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2026
·Vol. 27
·期 5
·2486
·
IF 5.6
Liming Shi,Yuheng Liao,Zeng Hong,Jiancheng Ruan,Shaodong Zhou,Chen Wu,Chao Qian
N,N-Dimethyl-1,3-propanediamine (DMAPA) is an important aliphatic diamine widely used in fine chemical manufacturing. Its industrial production traditionally relies on Raney nickel catalysts, which suffer from pyrophoric hazards and limited selectivity due to imine condensation side reactions. To address these challenges, we report an Al2O3-supported Ni-Cu alloy catalyst as an efficient alternative for the selective hydrogenation of N,N-dimethylaminopropionitrile (DMAPN). The optimized Ni30Cu5/Al2O3catalyst achieves complete DMAPN conversion and over 90% DMAPA selectivity under industrially relevant conditions (120 °C, 2.5 MPa H2). X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy analyses confirm the formation of substitutional Ni-Cu alloy nanoparticles, where Cu incorporation induces both geometric isolation of Ni ensembles and electronic modulation of surface active sites, thereby suppressing condensation-derived by-products. In addition, an NH3/ethanol-assisted process further improves selectivity while reducing autogenous operating pressure. Overall, this work demonstrates a safe and highly selective catalytic system for primary diamine synthesis, providing a practical alternative to conventional Raney Ni-based processes.
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JOURNAL OF THE ENERGY INSTITUTE
·
2026
·
IF 6.5
Zhi-Xin Li,Hui-Jie Cheng,Yi-Han Zhang,Cong-Jian Pan,Wei-Wei Yan,Wen-Long Mo,Xiao-Qin Yang,Cai-Xia Ju,Xiao-Yu Zhang,Zhi-Hao Ma,Xian-Yong Wei,Sheng Li
Crystallinity engineering of oxide supports has emerged as a powerful strategy to enhance the performance of supported catalysts, yet its application in complex oxides like lanthanum oxycarbonate (La 2 O 2 CO 3 ) remains underexplored. Here, we demonstrated that precise control of La 2 O 2 CO 3 crystallinity via calcination temperature tuning significantly improved the reverse water-gas shift (RWGS) reaction performance of Cu-based catalysts. CuLa500 catalyst, prepared at 500 °C, exhibited superior activity and stability compared to its high-crystallinity counterpart (CuLa800, 800 °C), achieving a CO 2 conversion of 54.4% and near-unity CO selectivity (>99.9%) at 600 °C under high space velocity conditions. Systematic characterization revealed that reduced crystallinity strengthens Cu-support interactions, optimizing CO 2 adsorption while enhancing structural robustness. This work not only establishes a scalable method for RWGS catalyst optimization but also provides mechanistic insights into the role of crystallinity in complex oxide-supported systems, offering a blueprint for advancing multiphase catalysis in energy-related reactions.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·Vol. 65
·期 34
·18159-18168
·
IF 3.9
Ren Xuping,Zhao Zijiang,Long Yanhui,Zhang Wenjun,Wang Jun,Zhang Hao
Developing efficient catalysts for
CO 2 hydrogenation
to methanol remains a challenge due to the inherent trade-off between
activity, selectivity, and cost. Herein, a series of metal-promoted
Cu catalysts (Zr, Zn, Ga) were synthesized via a ligand-modulated
oxalate coprecipitation strategy using malachite-derived CuO as the
precursor, enabling a low-cost and sustainable catalyst design. Among
these, the ZrO 2 /Cu catalyst (Zr/Cu = 14:86) exhibits the
optimal performance, delivering a CO 2 conversion of 13%
and a methanol space-time yield (STY) of 280.1 g MeOH ·kg cat –1 ·h –1 at 280 ° C
and 3.0 MPa, together with excellent long-term stability. Characterization
results suggest that highly dispersed Zr species effectively suppress
Cu particle agglomeration while generating abundant surface oxygen
vacancies (O V , 43.5%). Mechanistic studies indicate that
Zr incorporation induces strong electronic metal–support interactions
(EMSI), leading to the formation of electron-rich Cu 0 /Cu + sites. These sites act cooperatively with O V ,
where the former facilitates H 2 dissociation and the latter
promotes CO 2 adsorption and activation. Such synergistic
effects favor the formate-mediated pathway while suppressing the competing
reverse water–gas shift reaction. This work not only demonstrates
a high-performance catalyst derived from natural minerals but also
provides insights into the atomic-level synergy between electron-rich
metal sites and surface defects, offering a viable strategy for the
rational design of efficient catalysts for CO 2 hydrogenation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Shuai Zhang,Wen-Da Zhang,Han Zhao,Baoxin Wu,Jia-an Li,Cheng Zheng,Jiangyong Liu,Jian Wang,Jing Wang,Heng Zhao,Lin Zeng,Xiaodong Yan,Zhangxing Chen
Operando ATR-SEIRAS, DEMS, and DFT reveal an NH 2 OH-mediated AOR pathway at an enzyme-mimicking interface. • Cu 2 NCN/CuO achieves 98.93% FE at 1.50 V vs. RHE and a NO X - yield rate of 249.3 μmol cm -2 h -1 at 1.70 V vs. RHE. • A regeneration strategy mitigates surface poisoning and enables recovery of the oxidized products as crystalline KNO 3 . Electrochemical ammonia oxidation reaction (AOR) provides a promising route for the synthesis of nitrite and nitrate (termed NO x − ) under mild conditions. However, the selective conversion of NH 3 to NO x − is kinetically limited by the conventional stepwise dehydrogenation pathway. Herein, we report an ammonia monooxygenase (AMO)-inspired Cu 2 NCN/CuO heterostructure catalyst, in which the [N C–N] 2− framework provides a charge-buffering effect to stabilize Cu + -related species under oxidative AOR conditions. This biomimetic architecture enables the selective oxidation of NH 3 to NO x − by promoting a hydroxylamine (NH 2 OH)-mediated pathway that features early-stage N–O bond formation. As a result, it achieves a NO x − Faradaic efficiency as high as 98.93% at 1.50 V vs. RHE, with a corresponding yield rate of 48.48 μmol cm −2 h −1 . Operando attenuated total reflection surface-enhanced infrared absorption spectroscopy, differential electrochemical mass spectrometry, and density functional theory calculations collectively reveal that this catalytic architecture facilitates NH 2 OH intermediate formation and lowers the energy barrier for its subsequent oxidation, thereby underpinning its outstanding NO x − selectivity. These findings demonstrate that the AMO-inspired catalytic architecture provides an effective strategy for achieving efficient NO x − electrosynthesis via an NH 2 OH-mediated pathway. Download: Download high-res image (161KB) Download: Download full-size image An AMO-inspired biomimetic Cu 2 NCN/CuO heterostructure enables the selective conversion of NH 3 to NO 2 − and NO 3 − via an NH 2 OH-mediated pathway featuring early N–O bond formation.
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CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Fen Qiao,Zaisi Zhong,Jikang Zhao,Wenjie Liu
Cu-Ni 3 S 2 /NF with varying Cu doping levels were synthesized via a two-step hydrothermal method to investigate Cu's role in enhancing Ni 3 S 2 's alkaline hydrogen evolution reaction (HER). Optimal Cu doping reduced the overpotential to 193.4 mV and Tafel slope to 87.21 mV·dec −1 at 10 mA·cm −2 in 1 M KOH, alongside achieving high conductivity and the largest electrochemical active area (910 cm 2 ). HER performance peaked then declined with excessive Cu, confirming an optimal doping threshold. DFT calculations revealed Cu modulates Ni 3 S 2 's work function and charge transport, elucidating HER enhancement mechanisms. This work provides insights for optimizing Ni 3 S 2 -based HER catalysts through controlled heteroatom doping.
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