LANGMUIR
·
2023
·
IF 3.9
Huawen Zhu,Zhilin Cheng
The collaborative lubrication effect based on different lubricating nanostructures could not only overcome the respective drawbacks of different nanostructures as nanoadditives but also comprehensively improve friction performance. For this, we first developed a novel collaborative lubrication nanostructure based on Ag nanowires (NWs) and two-dimensional (2D) Ni-BDC nanosheets (Ag NWs/2D Ni-BDC) by the in situ chemical reduction strategy. The structural characterizations corroborated that Ag NWs with a width of approximately 20–30 nm grew on the surface of 2D Ni-BDC nanosheets, which presented the chemical interface between both. As the nanoadditive applied in oils, the tribological finding confirmed that the Ag NWs/2D Ni-BDC enabled the friction coefficient and wear scar diameter to reduce by 38 and 37% at 0.04 wt % additive content, respectively. The worn surface was characterized by a series of analytical techniques, which basically revealed the friction-reducing and antiwear mechanism based on the layered structure and self-repair effect. Consequently, the nanocomposite structure incorporating the nanowire and 2D nanosheets should be taken into account as a new potential lubricating material.
研究领域:
材料科学
·
摩擦学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Liudi Ji,Fei Li,Qi Jia,Yicheng Yao,Xiaoming Zhu,Zeyu Li,Peng Hu
Developing rapid and reliable electrochemical monitoring methods for 4-CP is of great significance to ensure the safety of the water environment. Electrochemical sensing materials with high sensitivity and selectivity are urgently needed. Here, interlaced sheet-like Ni-BDC frameworks (BDC: 1,4-dicarboxybenzene) and multi-walled carbon nanotubes (MWCNTs) composite (Ni-BDC/MWCNTs) are constructed via in-situ self-assembly of Ni-BDC in the presence of MWCNTs at room temperature . Because of the large specific surface area , high electrochemical activity of Ni-BDC, and the outstanding electrical conductivity of MWCNTs, the obtained Ni-BDC/MWCNTs compound had a significant signal enhancement effect for the oxidation of 4-CP based on the large electrochemical active area, fast electron transfer ability, strong accumulation ability, and high electrocatalytic rate. It was found that the electrochemical oxidation of 4-CP involved the transfer of an electron and a proton. A wide linear range (0.1–50 and 50–500 μM), low detection limit (16.5 nM), high reproducibility, strong stability, and good selectivity were achieved at the Ni-BDC/MWCNTs sensing platform. It also has been successfully used to monitor 4-CP in different river water samples, and got similar results compared to HPLC, which provides promising potential for application in water environment safety monitoring and protection.
研究领域:
环境科学
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材料科学
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电化学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 5
·1172-1180
·
IF 3.117
Qibing Dong,Chao Shuai,Zunli Mo,Ruibin Guo,Nijuan Liu,Guigui Liu,Jia Wang,Wentong Liu,Ying Chen,Jingjing Liu,Yangyang Jiang,Qinqin Gao
A Ni-based metal organic framework (Ni-BDC) and subsequently derived NiFe-LDH were studied to overcome the defect of the low availability of active sites for the oxygen evolution reaction (OER) during the water splitting process. This work reported NiFe-LDH nanosheets with an ultra-thin structure through an in situ surface-conversion derived from Ni-BDC. The unique structure and characteristic morphology were confirmed using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy, and the OER activities of the catalysts were systematically studied. The obtained results indicated that the synthesized Ni-BDC@NiFe-LDH-2 showed excellent OER activity, with a low overpotential of 272 mV at a current density of 10 mA cm−2, a small Tafel slope of 45 mV dec−1, and excellent stability, owing to the addition of abundant metal sites and the expansion of the electron transport channels during the conversion process to form the ultra-thin layer structure. This work provides a novel strategy for the application, design, and manufacture of metal organic framework (MOF)-based high-efficiency active materials.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Xinxing Jiang,Jihong Fu,Shuxian Ren,WenXia Xue
Substrate materials with high sensitivity and good reproducibility are highly desirable for the practical applications of surface-enhanced Raman scattering (SERS) techniques. In this study, a novel Ni-based metal-organic frameworks loaded gold nanoparticles (Ni-BDC-NH2/Au NPs) SERS substrate was successfully synthesized via electrostatic self-assembly method. The enhancement of the SERS signal is achieved owing to the synergy between chemical enhancement (CM) effect of Ni-BDC-NH2 and the electromagnetic enhancement (EM) of Au NPs, and the enriching of the analyte near the SERS “hot spots” through the strong adsorption capacity of the Ni-BDC-NH2. The Ni-BDC-NH2/Au NPs exhibited a high enhancement factor (EF) of 1.10×107 and a low detection limit of 5×10-9 mol/L. Besides, the substrate material showed exceptional stability up to 45 days at room temperature. The Ni-BDC-NH2/Au NPs was used to detect methylene blue (MB) that displayed a wide linearity (5×10-7-5×10-5 mol/L) and high recoveries (86.82-104.46%). These indicate that the Ni-BDC-NH2/Au NPs hybrid substrate has great potential for the detection of environmental pollution in practical applications.
研究领域:
材料科学
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环境科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2024
·
IF 6
Xin Fu,Bo Pu,Li Pan,Ruiqi Ming,Qian Lv,Xiaobo Chen,Lihong Tian
Urea oxidation reaction (UOR) is a promising substitution for the oxygen evolution reaction (OER) on anode for highly efficient H2 production. However, the sluggish kinetics and high oxidation potential of NiII → NiIII severely limit the activity of Ni-based catalysts in the electrochemical UOR. Herein, composition regulation was adopted to enhance the electrocatalytic activity of a nickel-benzene dicarboxylate framework (Ni-BDC MOF)-derived electrode towards urea oxidation. In 1 M KOH with 0.33 M urea solution, the derived amorphous tri-metallic hydroxide layer on the surface of the NiMnCo MOF, induced by electro-activation, exhibited a low onset potential and a steeply rising current density with increasing applied potential. It achieved a benchmark current density of 10/100 mA cm−2 at an anode potential of 1.28/1.33 V vs. RHE, respectively. In particular, a 500 mA cm−2 current density was reached at an impressively low potential of 1.41 V vs. RHE. This exceptional performance is ascribed to the fact that the open framework provides a large electrochemical active surface, while the multicomponent synergy decreases the NiII → NiIII oxidation potential, enhances electron transfer and promotes the UOR kinetics. This study suggests that rational composition regulation is a promising approach to improving the performance of Ni-based MOF materials towards electrocatalytic urea oxidation.
研究领域:
材料科学
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电化学
·
催化
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bing He,Ying-Jie Wang,Xuefeng Bai,He Bian,Yabo Xie,Rui Li,Jian-Rong Li
MOF-on-MOF composites are deemed promising candidates to accomplish synergistic CO 2 capture and photoreduction thanks to their plentiful active sites, extended light response range, timely separation of photoexcited electron-hole pairs, and large CO 2 adsorption capacities. Unfortunately, the controllable growth of the designed MOF-on-MOF heterostructure is challenging. Deficient interphase contact and the consequent mass transfer deprivation is one of the primary obstacles severely impairing the catalytic efficiency. Herein, the contact between two widely-employed MOFs of Ni-BDC and NH 2 -MIL-125 was significantly strengthened by exploiting a self-assembled array of Ni-BDC microsheets. In contrast to the spontaneously formed spheroidal aggregate, the loosely-packed array exhibits amplified accessible surfaces to interact with NH 2 -MIL-125, contributing to a radically improved interfacial built-in electric field and 7∼9 times rises in the product yields. Moreover, the preferably thin thickness of Ni-BDC microsheets prompts its macroscopic flexibility, permitting intensified deformation for enhanced interphase contact. Coupled with the additional contribution from its copious Lewis acid sites, the developed NH 2 -MIL-125@Ni-BDC array simultaneously converted CO 2 into CO and CH 4 at rates that cannot be matched by its isostructural Co counterpart with declined acidity and flexibility. This work innovatively reveals the immense importance of morphology tailoring and assembly tactic to interphase contact modulation and the upgrade of catalyst performances.
研究领域:
材料科学
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催化化学
·
环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Li Mei,Qian Wang,Yao Yao,Xiaolong Fang,Ziwen Li,Chao Liu,Ganggang Chang,Xiaoyu Yang
Tandem catalysis can enhance the reaction efficiency and selectivity while reducing separation and purification steps, thus improving the development of “green chemistry”. The tandem synthesis of cyclic carbonates (CCs) from olefins and CO2 is becoming one of the most promising strategies; however, designing a multifunctional catalyst with multiple sites and fast mass transfer channels to overcome mass transfer resistance at different sites remains a challenge. In this work, we controllably synthesized a bulk and nanosheet (NS) structure of Ni-BDC-NH2 (Ni-BDC-NH2 NS) via a solvent regulation strategy and successfully immobilized Ag+ in Ni-BDC-NH2 NS to form Ag+@Ni-BDC-NH2 NS, which integrated highly exposed, synergistic acid (Ag+) and base (−NH2) active sites, along with rapid mass transfer channels. Benefiting from these synergistic effects and structural advantages, Ag+@Ni-BDC-NH2 NS efficiently catalyzed one-pot synthesis of CCs from olefins and CO2, achieving 99% conversion of styrene and 51% selectivity for styrene carbonate (SC) under optimal conditions, which was significantly higher than that of contrast catalysts lacking Ag+ or –NH2 (SC selectivity <30%). Based on experiments, a feasible mechanism was proposed, in which the Lewis acid sites (Ag+) catalyzed olefin epoxidation, while the Lewis base sites (−NH2) and acid sites (Ag+) synergistically catalyzed the cycloaddition reaction of CO2 and epoxides. Additionally, the catalytic performance and structural stability were maintained even after five successive recycling tests.
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DOI
高影响因子
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