C-Journal of Carbon Research
·
2026
·Vol. 12
·期 1
·
IF 4.3
Qi Qiang,Kezhi Li,Tianzhan Shen,Haibo Ouyang
The pantograph slider is a key friction component in high-speed train systems, and its performance directly affects the safety and efficiency of operation. In this study, Cf/C/CuNi composites with carbon fiber contents of 1 wt.%, 3 wt.%, 5 wt.%, and 7 wt.% were prepared by a solvothermal method combined with spark plasma sintering (SPS). The influence of carbon fiber content on the mechanical and friction properties of the composites was systematically studied. The results show that the flexural strength of the composites increases from 20.20 MPa to 38.45 MPa with an increase in the carbon fiber content. However, excessive carbon fiber content can lead to fiber agglomeration and interface defects, thereby reducing the friction stability and increasing the wear rate from 0.64 g/m3to 1.60 g/m3. A carbon fiber content of 1 wt.% helps to form a continuous lubricating film, resulting in a low and stable friction coefficient. This study provides valuable insights for the design and optimization of high-performance pantograph slider materials for high-speed railway applications.
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高影响因子
ACS Nano
·
2024
·
IF 15.8
Yao Hu,Haihui Lan,Junjun He,Wenjing Fang,Wen-Da Zhang,Shuanglong Lu,Fang Duan,Mingliang Du
Despite the immense potential of Dual Single-Atom Compounds (DSACs), the challenges in their synthesis process, including complexity, stability, purity, and scalability, remain primary concerns in current research. Here, we present a general strategy, termed “Entropy-Engineered Middle-In Synthesis of Dual Single-Atom Compounds” (EEMIS-DSAC), which is meticulously crafted to produce a diverse range of DSACs, effectively addressing the aforementioned issues. Our strategy integrates the advantages of both bottom-up and top-down paradigms, proposing an insight into optimizing the catalyst structure. The as-fabricated DSACs exhibited excellent activity and stability in the nitrate reduction reaction (NO3RR). In a significant advancement, our prototypical CuNi DSACs demonstrated outstanding performance under conditions reminiscent of industrial wastewater. Specifically, under a NO3– concentration of 2000 ppm, it yielded a Faradaic efficiency (FE) for NH3 of 96.97%, coupled with a mass productivity of 131.47 mg h–1 mg–1 and an area productivity of 10.06 mg h–1 cm–2. Impressively, even under a heightened NO3– concentration of 0.5 M, the FE for NH3 peaked at 90.61%, with a mass productivity reaching 1024.50 mg h–1 mg–1 and an area productivity of 78.41 mg h–1 cm–2. This work underpins the potential of the EEMIS-DSAC approach, signaling a frontier for high-performing DSACs.
研究领域:
催化
·
材料科学
·
环境化学
·
纳米技术
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PubMed
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Bihui An,Mingkun Wu,Haoran You,Chenhao Zhang,Mengkui Tian
Electrochemical conversion of carbon dioxide (CO2) into syngas is an effective strategy for mitigating global warming and enabling carbon circularity. However, achieving a tunable and stable H2/CO ratio remains challenging due to the competitive adsorption and reaction kinetics of CO2 reduction and hydrogen evolution. Herein, a metal–organic framework-derived pyrolysis strategy constructs CuNi bimetallic nanoclusters on nitrogen-doped carbon (CuNi–NC), where Cu–Ni electronic interactions enable site-specific regulation of surface adsorption. The optimized Cu1Ni1–NC catalyst achieves a high FECO of 93.3% and a CO partial current density of −25.82 mA cm–2, with excellent stability over 28 h. Across a broad potential window from −0.51 to −0.81 V (vs RHE), CO-rich syngas with an H2/CO ratio around 0.37 is consistently produced. Furthermore, the syngas composition can be tuned by modulating the Cu/Ni ratio and applied potential, altering the relative contribution of CuNi active sites differing in electronic structure. Combined in situ attenuated total reflection Fourier transform infrared spectroscopy and density functional theory calculations reveal that Cu–Ni electronic synergy induces site-specific electronic modulation, optimizing the d-band center to stabilize *COOH intermediates and promote selective CO2-to-CO conversion. This work establishes a Cu–Ni bimetallic catalytic system for tunable syngas production and provides mechanistic insight into site-specific adsorption driven by electronic synergy.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Guolong Qiu,Wei He,Guangxu Yao,Chuanzhen Feng,Huijuan Zhang,Jinling Ma,Yu Wang
Development of non-noble metal-based electrocatalysts to enhance the performance of zinc-air batteries (ZABs) is of great significance, but it remains a formidable challenge due to their poor stability and activity. Herein, a bifunctional CuNi-TiO x /NCNFS electrocatalyst , featuring with electron-rich copper-nickel (CuNi) alloy nanoparticles anchored on titanium oxide/ N -doped carbon nanofibers (TiO x /NCNFS), is constructed by a dual-substrate loading strategy. The introduction of TiO x has led to a significant increase in the stability of the dual-substrate. The strong electronic interaction between CuNi and TiO x strengthens the anchoring of active metal sites, thus accelerating the electron transfer. Theoretical calculations unclose that NCNFS can regulate the charge distribution of TiO x , inducing the charge transfer from NCNFS → TiO x → CuNi, thereby reducing the d-band center of Cu and Ni, which is beneficial to the desorption of intermediate oxide species of the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Therefore, CuNi-TiO x /NCNFS delivers a remarkable bifunctional performance with a low OER overpotential of 258 mV at 10 mA cm −2 and an ORR half-wave potential of 0.85 V. When assembled into ZABs, CuNi-TiO x /NCNFS shows a low potential gap of 0.64 V, a higher power density of 149.6 mW cm −2 at 330 mA cm −2 , and an outstanding stability for 250 h at 5mA cm −2 . This study provides a novel approach by constructing dual-substrate to tune the electronic structure of active metal sites for efficient rechargeable ZABs.
研究领域:
材料科学
·
能源化学
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PubMed
高影响因子
Nano Research
·
2023
·Vol. 16
·期 5
·6632-6641
·
IF 9.9
Zhang Zunjie,Liu Yang,Su Xiaozhi,Zhao Ziwei,Mo Zhenkun,Wang Chenyi,Zhao Yaling,Chen Ye,Gao Shuyan
Electrochemical nitrate reduction reaction (NO 3 RR) has great potential for ammonia (NH 3 ) synthesis benefiting from its environmental friendliness and sustainability. Cu-based alloys with elemental diversity and adsorption tunability are widely used as electrocatalyst to lower the reaction overpotential for NO 3 RR catalysis. However, phase separation commonly found in alloys leads to uneven distribution of elements, which limits the possibility of further optimizing the catalytic activity. Herein, an electro-triggered Joule heating method, possessing unique superiority of flash heating and cooling that lead to well-dispersed nanoparticles and uniform mixing of various elements, was adopted to synthesize a single-phase CuNi nano-alloy catalyst evenly dispersed on carbon fiber paper, CFP-Cu 1 Ni 1 , which exhibited a more positive NO 3 RR initial potential of 0.1 V versus reversible hydrogen electrode (vs. RHE) than that of pure copper nanoparticles at 10 mA·cm −2 in 0.5 mol·L −1 Na 2 SO 4 + 0.1 mol·L −1 KNO 3 solution. Importantly, CFP-Cu 1 Ni 1 presented high electrocatalytic activity with a Faradaic efficiency of 95.7% and NH 3 yield rate of 180.58 µmol·h −1 ·cm −2 (2550 µmol·h −1 ·mg
−1 cat
) at −0.22 V vs. RHE. Theoretical calculations showed that alloying Cu with Ni into single-phase caused an upshift of its d-band center, which promoted the adsorption of NO
− 3
and weakened the adsorption of NH 3 . Moreover, the competitive adsorption of hydrogen ions was restrained until −0.24 V. This work offers a rational design concept with clear guidance for rapid synthesis of uniformly dispersed single-phase nano-alloy catalyst for efficient electrochemical NO 3 RR toward ammonia.
研究领域:
材料科学
·
电化学
·
环境科学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ying-Hua Zhou,Suqin Wang,Yu Wan,Jingjing Liang,Yu Chen,Shizhong Luo,Cheng Yong
Low-cost metallic nanoparticles as catalysts with good performance are highly desired for the development of hydrogen storage materials . In this work, ceria-doped CuNi nanoparticles were successfully immobilized on the surfaces of reduced graphene oxide (rGO) by a simple co-reduction approach in aqueous solution at room temperature, characterized by ICP-OES, XRD , TEM, SEM-EDS and XPS techniques. The as-synthesized CuNi-CeO 2 /rGO nanocomposites with various metal contents had been employed as heterogeneous catalysts for the hydrolytic dehydrogenation of ammonia borane (NH 3 BH 3 , AB) under mild conditions. The optimal catalyst of Cu 0.8 Ni 0.2 -CeO 2 /rGO with CeO 2 content of 13.9 mol% exhibited an excellent catalytic activity with the exceedingly high TOF value of 34.4·mol H2 ·mol catalyst −1 ·min −1 at 298 K. The apparent activation energy was calculated to be 19.1 kJ mol −1 , even lower than most of noble-metal-based catalysts for AB dehydrogenation. The detailed kinetics of AB hydrolysis catalyzed by Cu 0.8 Ni 0.2 -CeO 2 /rGO had been investigated on different concentrations of catalyst, substrate and temperatures. Moreover, the obtained in situ hydrogen from AB hydrolysis can be further applied to reduce 4-nitrophenol with a high TOF value of 8.1 min −1 at room temperature. The high catalytic activity of Cu 0.8 Ni 0.2 -CeO 2 /rGO would be contributed to the small size of CuNi-CeO 2 NPs, metal-metal synergy, and the metal-support interaction.
研究领域:
材料科学
·
催化化学
·
能源存储与转换
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Shangpu Zhuang,Di Hao,Yilin lei,Jiahui Chu,Fan Xue,Tao Wei,Yuyu Sun,Zhuxiu Zhang,Ruiping Wei,Jihai Tang,Xu Qiao
MOF-templated strategy fabricates highly dispersed Cu x Ni 2-x /CeO 2 catalysts. • Cu 1.2 Ni 0.8 /CeO 2 achieves 100% BHMF yield under mild reaction conditions. • Cu-O V interfacial sites induce vertical adsorption for C=O selective activation. • Ni-promoted H spillover boosts hydrogenation efficiency. Efficient utilization of biomass is a cornerstone of green chemistry and sustainable development. 5-Hydroxymethylfurfural (5-HMF) constitutes a pivotal biomass-derived platform molecule which selective hydrogenation into 2,5-bis(hydroxymethyl)furan (BHMF) plays a crucial role in the development of bio-based materials and fine chemicals. Conventional monometallic catalysts, however, are often constrained by an intrinsic trade-off between activity and selectivity and tendencies toward particle sintering and deactivation. To address these challenges, a metal–organic-framework (MOF) precursor was employed in a self-sacrificial templating route to fabricate highly dispersed, oxygen vacancies-tunable, bimetallic Cu x Ni 2–x /CeO 2 catalysts. By integrating comprehensive physicochemical characterization with in-situ spectroscopies, a systematic investigation was conducted to examine the effects of the Cu/Ni ratio and oxygen vacancy (O V ) concentration on 5-HMF hydrogenation were systematically investigated to elucidate structure–activity relationships. The results demonstrate that the Cu 1.2 Ni 0.8 /CeO 2 catalyst achieves an optimal balance between O V and metal site distribution, enabling nearly complete 5-HMF conversion and exclusive selectivity toward BHMF. Interfacial synergy facilitates Ni-mediated H 2 dissociation and hydrogen spillover to Cu sites, while the O V selectively adsorbs and activates the carbonyl of HMF, suppressing furan-ring hydrogenation and other side reactions. Compared with prior reports, this work highlights the decisive roles of O V and bimetallic interfaces in promoting substrate-selective adsorption, active-hydrogen supply, and side-reaction suppression. This strategy advances the high-value conversion of biomass platform molecules and provides a conceptual foundation for the rational design of green catalysts. Download: Download high-res image (116KB) Download: Download full-size image
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Hui Dong,Zuying Wang,Xiaoyu Lv,Weitian Chen,Yuying Zhang,Jiahui Wu,Xinyu Zhang,Xianxu Chu,Yanli Zhou,Yintang Zhang,Xiaohua Ma,Zhaohui Li,Maotian Xu
Adenine, a key purine base in DNA/RNA, is closely associated with diseases like gout, hyperuricemia, and tumors. Herein, a novel dual-ratiometric electrochemical sensor (CuNi-Gp) was fabricated for rapid adenine quantification in human serum via one-step electrodeposition of copper‑nickel nanoparticles (CuNi-NPs) on flexible graphite paper (Gp). CuNi-NPs enhanced adenine accumulation and electron transfer and acted as an internal reference for dual-ratiometric quantification. Two signals were used: a 0.2 V signal from adenine-CuNi-NPs coordination and a 0.9 V signal from adenine oxidation to 2-hydroxyadenine. Both were normalized against Cu 2+ intrinsic signal (j₀) to form j 1 /j 0 and j 2 /j 0 for self-calibration. The sensor showed excellent performance with 6–110 μM linear range, 4.2 μM detection limit (3σ/slope), strong anti-interference, and high selectivity. Spiked human serum tests yielded 97.8 %–102.8 % recoveries and 1.82 %–4.14 % RSDs, confirming accuracy. This work provides a simple, cost-effective sensor with one-step fabrication, dual-ratiometric self-calibration, and serum compatibility, promising clinical use in early diagnosis of adenine metabolism-related diseases.
研究领域:
生物医学工程
·
分析化学
·
分子诊断
·
转化医学
·
纳米生物技术
·
电化学传感
·
临床检验
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-10
·
IF 5.3
Li Xiaoqing,Huang Feng,Bao Chengqi,Shao Rong,Deng Lei,Yang Minghui
The overexpression of interleukin-17A (IL-17A) is closely associated with the pathogenesis of autoimmune diseases and cancer, rendering precise identification of IL-17A level critical for disease diagnosis and prognosis monitoring. In this study, CsPbBr 3 nanoclusters (NCs) were embedded in C 16 H 14 Br 2 O 6 Pb 2 organometallic compound (Pb-MA MOC) via a hot injection approach. Through this way, the issue of CsPbBr 3 NCs susceptible to decomposition in water was solved, and the photocurrent intensity that is generated by CsPbBr 3 was significantly enhanced. A highly sensitive photoelectrochemical (PEC) sensor for detecting IL-17A in human serum was developed using CsPbBr 3 /Pb-MA as the photoactive material. The electrode was initially modified with CsPbBr 3 /Pb-MA. Then, antibody-modified Fe 3 O 4 magnetic nanoparticles (MNs) with target analyte IL-17A captured, and IL-17A antibody-modified Au@CuNi diatomic catalyst (DAC) formed sandwich immune complex structure on the electrode. The existence of CuNi DAC led to a substantial reduction in photoelectric signal intensity due to oxidation of ascorbic acid in the supporting electrolyte. The photocurrent intensity exhibited linear correlation with IL-17A concentration within the range 15-750 pg/mL, and achieving an impressive detection limit of 1 pg/mL. Moreover, the sensor was successfully applied to the determination of IL-17A in human serum, suggesting its potential clinical applications. Graphical Abstract
研究领域:
生物医学工程
·
分析化学
·
纳米技术
·
免疫学
·
临床诊断
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）