JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jinghao Lu,Lili Yang,Chuanhui Zhang,Haijie Cao,Xingyun Li,Lianying Zhang,Chang Long,Xiu Song Zhao
Realizing the evolution of Cu valence state in the electrocatalytic CO 2 reduction reaction (eCO 2 RR) is crucial to maintain active sites, optimize reaction conditions and product selectivity and understand reaction mechanism and kinetics. In this context, we investigated the dynamic transition of Cu(II), Cu(I) and Cu(0) under the eCO 2 RR conditions and impact of such transition on reaction intermediate species and product selectivity. In situ surface-enhanced Raman spectroscopy and attenuated total reflectance-surface-enhanced infrared absorption spectroscopy results coupled with quantitative data collected from a flow cell show that Cu (I) species contributes to CO 2 activation, CO adsorption, and subsequent C–C coupling processes, while the initial adsorption of Cu (0) in CO 2 playing a crucial role. These findings clarify how the valance of Cu changes with applied cathodic potential and reaction time, thus offering guidelines on optimization of operating conditions during CO 2 electrolysis to maintain the active sites responsible for forming desirable products. These new understandings lay a solid ground for purposely designing Cu-based catalysts for improved performance in CO 2 electrolysis, significantly advancing our knowledge on the behavior of Cu-based electrocatalysts in CO 2 electrolysis.
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PubMed
高影响因子
ACS Nano
·
2026
·
IF 16
Huafeng Fu,Shiteng Long,Jia Hu,Jiehua Li,Hansong Xue,Yu’an Chen,Fusheng Pan
To address the challenges of high hydrogen release temperatures, sluggish kinetics, and inadequate cycling performance of magnesium hydride (MgH2), we developed the niobium-based bimetallic compound catalyst CuNb2O6 with excellent catalytic performance. It was found that the MgH2/CuNb2O6 composite material achieved 4.28 wt % hydrogen uptake within 10 min at 100 °C, and even at a lower temperature of 50 °C, it has 2 wt % hydrogen absorption capacity within 60 min, showing excellent hydrogen absorption performance. For hydrogen desorption, the MgH2/CuNb2O6 composite material demonstrated exceptional midtemperature hydrogen release kinetics, with 4.65 wt % hydrogen released within 20 min at 225 °C. The apparent activation energy for hydrogen release of MgH2/CuNb2O6 was determined to be 50.95 kJ/mol, which was approximately 66.4% less than that of ball-milled magnesium hydride. Cyclic testing further confirmed the stability of the MgH2/CuNb2O6 composite, with its hydrogen storage capacity stabilizing at 5.21 wt % after 50 cycles. Catalytic mechanism studies revealed that the MgH2/CuNb2O6 composite undergoes in situ reconstruction of multiple-phase catalytically active species, which effectively improved the hydrogen storage performance of MgH2. This work innovatively constructed a representative Mg2Cu@NbO2 heterojunction, and the results showed that hydrogen molecules were significantly activated at the interface, demonstrating the synergistic catalytic effect between the Cu and Nb species. This study provides a possible approach for designing high-efficiency catalysts for magnesium-based hydrogen storage materials.
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INORGANIC CHEMISTRY
·
2026
·
IF 4.7
Yarong Chai,Bo Gao,Song Xu,Qun Xu
Electrocatalytic conversion of nitrate to ammonia is a rapidly evolving field due to its potential applications toward nitrate pollution remediation and sustainable ammonia synthesis. As a group of well-established electrocatalysts, the activity of Cu-based materials is highly related to the coordination environment. Herein, a novel Cu–La-based dual-atom catalyst (Cu–La/DAC) was prepared using a Robson-type bimetallic Cu–La complex as precursor, where the square-planar Cu center of Cu–La/DAC effectively deviates due to the presence of adjacent La atom. As a result, the HOMO (dxy) energy of Cu is effectively reduced, which facilitates the formation of low-valent Cu and subsequent electrocatalysis. Compared to Cu2/DAC analogue containing square-planar Cu, Cu–La/DAC exhibits significantly enhanced activity toward electrocatalytic nitrate (NO3–) reduction to ammonia (NH3) (yield: 14.02 mg h–1 cm–2; Faraday efficiency: 88.42%), which is theoretically attributed to the reduced energy barrier of NO3– adsorption and *NO3 deoxygenation induced upon the coordination environment modulation of Cu.
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Advanced Materials Interfaces
·
2018
·Vol. 6
·期 2
·1801200
·
IF 4.834
Yutian Wang,Hanjun Hu,Yufan Sun,Yang Tang,Liming Dai,Qing Hu,Adrian Fisher,Xiao Jin Yang
Nanostructure and crystallinity of transition metals play an important role in catalyzing carbon dioxide electroreduction (CO 2 ER) where Cu is a typical electrocatalyst with a wide variety of products and Pb has a high overpotential for H 2 evolution and is selective toward formic acid. In this study, 3D hierarchical nanostructures of Cu–Pb catalyst are prepared by a two-step electrodepositing–annealing–electroreduction approach (EAE). Cu nanowires (Cu NWs) of 200–400 nm diameter are built on the surface of commercial nickel foam substrates through an EAE step. Then, Pb nanoparticles with diameter of 5–10 nm are uniformly created on the surface of Cu NWs by a second EAE step. The nanostructural Cu–Pb electrodes catalyze CO 2 ER at a current density of −9.35 mA cm −2 (at −0.93 V vs reversible hydrogen electrode (RHE)). The H 2 evolution is suppressed by 35.6% and CO and HCOOH are enhanced by 29.6% and 9.2%, respectively, as compared with Cu NWs. The protocol proposed in this study provides a simple and straightforward approach for preparing high-performance, hierarchical nanostructures of Cu–Pb bimetal catalyst for CO 2 ER.
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Journal of Materiomics
·
2019
·Vol. 5
·期 3
·489-495
·
IF 0
Ruonan Wu,Zhili Li,Yongbo Li,Li You,Pengfei Luo,Jiong Yang,Jun Luo
Superionic conductors, which exhibit liquid-like phonon transport but crystal-like carrier transport, have attracted great attention and broad research interest in the thermoelectric community. Ag 2 Te is a superionic conductor; however, its small band gap and large Ag vacancy formation energy impede its application as a prominent p-type thermoelectric material. In this work, synergistic optimization of the thermoelectric performance of Ag 2 Te through Cu substitution is realized through a combination of experimental and theoretical efforts. For the electrical transport, Cu substitution systematically increases the band gap of Ag 2 Te and reduces the cation vacancy formation energy. These two beneficial effects simultaneously increase the electrical conductivity and suppress the bipolar effect, thereby greatly enhancing the p-type electrical transport properties of Ag 2 Te. For the thermal transport, alloying Cu 2 Te with Ag 2 Te significantly reduces the thermal conductivity through not only point defect scattering but also softening of the interatomic interactions. The latter is attributed to the relatively small Cu atoms vibrating in the oversized 8c sites. This two-fold optimization results in maximum thermoelectric figure of merit zT values of over 1.3 at 773 K for both Ag 1.2 Cu 0.8 Te and AgCuTe, demonstrating the great potential of Ag 2− x Cu x Te as a promising p-type thermoelectric material system.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Peng Chen,Sanyuan Hu,Ting Zhou,Heping Li,Youwei Yan
Cu/TiN hybrid nanofibers were successfully fabricated by applying nitridation procedure to CuO/TiO 2 nanofibers. Through modifying the nitridation temperature, the electrical conductivity of Cu/TiN nanofibers was tunable, which could achieve a high value of 320 S/cm-approximately three times that of TiN nanofibers. The oxidation resistance property of the resulting Cu/TiN nanofibers was assessed. With the excellent chemical stability of TiN composition, hybrid Cu/TiN nanofibers possessed greatly enhanced thermostability. Moreover, by taking advantage of readily fiber patterning using electrospinning, Cu/TiN nanofiber networks were assembled as transparent electrodes, which reached an optoelectrical achievement of 34.4 Ω/sq at 83.2% transparency. Given its low-cost, enhanced thermostability, together with considerable optoelectrical achievement, Cu/TiN nanofiber is therefore expected to offer a new platform for cost-efficient transparent electrode.
研究领域:
材料科学
·
纳米技术
·
电子学
·
能源材料
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ACS Omega
·
2020
·
IF 2.87
Jiahao Wang,Xianbin Jia,Shiyun Lou,Guihui Li,Shaomin Zhou
There are many studies concentrated on high-temperature performance of SnSe2, but few studies were conducted on low-temperature properties of embedded SnSe2. In this work, a series of SnCuxSe2 (x = 0, 0.01, 0.02, and 0.05) layered structures have been successfully synthesized by a melt quenching, mechanical milling process, and spark plasma sintering (SPS) method. Meanwhile, the thermal and electrical transport properties of all synthesized samples are measured. These results suggest that the embedding of Cu into SnSe2 results in a high carrier concentration (1019/cm3). In addition, the enhancement of defect and interfacial phonon scattering caused by Cu embedding as well as the weak van der Waals force between layers makes a low thermal conductivity (0.81 W/mK) for the SnCu0.01Se2 at 300 K. Moreover, the maximum ZT is acquired up to 0.75 for the SnCu0.01Se2 sample at 300 K, which is about 2 orders of magnitude higher than the pristine sample (0.009). These features indicate that Cu-embedded SnSe2 can be a promising thermoelectric material at gentle temperature.
研究领域:
材料科学
·
热电学
·
固体物理
·
纳米材料
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Materials Today Communications
·
2023
·
IF 3.8
Yanan Chen,Yuanbo Zhao,Weijun He,Yanan Liu,Hongna Xing,Xiuhong Zhu,Yanqun Guo,Juan Feng,Chunyan Liao,Yan Zong,Xinghua Li,Xinliang Zheng
Significant volume changes and slow ionic transport during charge/discharge processes restrict the improvement of electrochemical performance for Cu x S (x = 1–2). Herein, a new strategy by introducing Cu-BTC (copper(II)-benzene-1,3,5-tricarboxylate) as a processor to derive three-dimensional Cu 1.81 S@C using green sulfurization and calcination methods is proposed. Benefiting from the high electrical conductivity , multistage pore size structure and stable structure brought by the conductive carbon skeleton after calcination , Cu 1.81 S@C-650 o C exhibits a high specific capacitance of 291.1 F g -1 at a current density of 1 A g -1 and a superior rate capability of 83.6 % at a current density of 10 A g -1 . In addition, the assembled asymmetric supercapacitor (Cu 1.81 S@C-650 o C//AC ASC) also shows impressive performances, such as an energy density up to 16 Wh kg -1 at a power density of 352 W kg -1 and an excellent cycling stability of 93.1 % over 5000 cycles at a current density of 2 A g -1 . This work demonstrates that the Cu-BTC-derived Cu 1.81 S@C is an attractive material with potential applications in energy storage devices.
研究领域:
材料科学
·
能量存储
·
超级电容器
·
金属有机框架（MOFs）
·
纳米材料
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Minqin Huang,Erhao Wang,Xiuju Li,Zhiying Wei,Tiantian Wang,Ao Wang,Li Yang
In this study, a fascinating nanoplatform, possessing fluorescent imaging, hyperthermia-amplified reactive oxygen species (ROS) generation, and calcium-overloaded comediated multimodal therapeutic effects toward breast malignancy, was innovatively constructed. Accordingly, engineering this accurate targeting theranostic scheme can be used for efficacious ablation of breast carcinoma. Because Cu and Ca ions can induce ROS generation and cytoplasmic overaccumulation, respectively, here, a Cu–Ca-based nanoplatform was designed by adsorbing indocyanine green (ICG) through the relatively high specific surface area and Arg-Gly-Asp peptide (RGD) decorating by covalent conjugation. Upon the internalization of breast tumor cells, biodegradation was triggered under an intracellular weak acid microenvironment; the released ICG molecules allowed for near-IR (NIR) II fluorescent imaging and photothermal production. Importantly, Cu ions in the nanoplatform guaranteed more efficient Fenton-like reaction-mediated chemodynamic therapy under NIR laser exposure. Meanwhile, the virus-like hollowed Cu–Ca (VhCu-Ca) nanoplatform created an artificial calcium-overloading stress in the cytoplasm. In vitro and in vivo studies have demonstrated that our proposed Cu–Ca-based nanoplatform integrated the advantages of breast tumor targeting, NIR II fluorescent imaging, and efficient ablation via synergistic treatments. Therefore, this multimode nanoplatform developed a facile and versatile strategy for the diagnosis and suppression of breast tumors.
研究领域:
纳米医学
·
癌症诊疗一体化
·
生物医学工程
·
活性氧研究
·
光热治疗
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MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Hong Qian,Binxia Yuan,Yuhao Liu,Weiling Luan
This study employed a simple low-temperature hydrothermal and sintering method to prepare TiO 2 (referred as T) heterostructure with different surface hydroxyl concentrations. Auger analysis indicated the binding energy peaks at 565 eV and 570 eV were corresponded to Cu 2+ and Cu 0 , respectively, which proved that the heterostructure was TiO 2 /CuO/Cu (referred as TC). Meantime, XPS and FTIR indicated that altering the calcination temperature was beneficial for controlling the proportion of surface hydroxyl groups (-OH). Among the samples, TC calcined at 300 °C (denoted as TC-300 °C) exhibited the highest photocatalytic performance, delivering an H 2 evolution rate of 182.68 μmol g −1 h −1 , which is 3.3 times and 1.9 times higher than those of T and the uncalcined TC sample, respectively. DFT calculations showed that the rate-determining step of the oxygen evolution reaction (OER) occurred at the *OH adsorption step. By comparing different hydroxyl adsorption sites on TiO 2 , CuO, and Cu, it was confirmed that hydroxyl groups adsorbed near Ti atoms were more favorable for improving catalytic activity. Additionally, the electron transfer process in TiO 2 /CuO/Cu heterostructure was proposed. This provided insights for the preparation of highly efficient catalysts that can promote photocatalytic water splitting half-reactions and improve hydrogen production efficiency.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Hongming Hou,Xiaoxue Liang,Xianglong Li
Efficient Cu 2+ -creatinine complexation is essential for the sensitivity of Cu-based non-enzymatic electrochemical creatinine sensors. Herein, a morphological optimization strategy for Cu nanostructures was applied to promote Cu 2+ -creatinine complexation. Accordingly, a screen-printed carbon electrode (SPCE) was pretreated with saturated sodium carbonate to form P-SPCE and subsequently subjected to one-step electrodeposition to fabricate a multi-morphological Cu-modified electrode (Cu/P-SPCE). The resulting multi-morphological Cu architecture enhances creatinine adsorption and facilitates the efficient formation of Cu 2+ -creatinine complexes, leading to improved detection sensitivity. Electrochemical testing revealed that the Cu/P-SPCE sensor achieved a wide linear range from 5 to 400 μM, a sensitivity of 5.01 μA·μM −1 ·cm −2 , and a detection limit of 2.86 μM. It showed promising selectivity for common interferences, such as uric acid and ascorbic acid, and excellent batch-to-batch reproducibility, with a relative standard deviation of 1.40% ( n = 12). Validation using human urine samples demonstrated good agreement with clinical enzyme assays, with accuracies exceeding 91.50%. These results indicate that morphological optimization of Cu-based electrodes provides an effective strategy for sensitive creatinine detection.
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TALANTA
·
2026
·
IF 6.7
Wenkai Zhang,Yingxi Qin,Lanxiu Ni,Yushu Shi,Hongyu Zhang,Chunsheng Li,Yujia Liu,Yu Wang,Liang Feng
Accurate and real-time detection of biogenic amines is vital for food safety, yet developing sensors that combine selectivity with environmental stability remains a challenge. Here, we report a new strategy using copper-integrated, self-assembled carbonized polymer dots (Cu-CPDs) to overcome these limitations. Here we introduce a novel strategy in which Cu 2+ active sites are precisely anchored within the self-assembled supramolecular framework of carbonized polymer dots (Cu-CPDs), yielding a robust colorimetric chemosensor. X-ray photoelectron spectroscopy and controlled experiments confirm that the sensing mechanism relies on specific Cu 2+ -NH 3 coordination chemisorption rather than non-specific physisorption, endowing the Cu-CPDs with exceptional selectivity towards amines. The sensor maintains stable performance at different temperatures and relative humidity up to 90%, delivering a rapid linear colorimetric response suitable for on-site spoilage monitoring of protein-rich foods. More importantly, this work also provides a generalizable sensor design paradigm that leverages the self-assembled CPDs matrix to host functional metal sites, addressing critical limitations in chemical sensing.
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