Inorganic and Nano-Metal Chemistry
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2017
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IF 0
Ziao Zong,Xiangmin Meng,Xin Li,Caifeng Bi,Yuhua Fan
A novel Ni(II) coordination polymer, {[Ni(C9H9N2O3)2(H2O)2]·H2O}n(1)(C9H11N2O3, p-Aminohippuric acid, PAH), has been synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectra, and thermal analysis. Single-crystal X-ray analysis reveals that each Ni(II) ion is six-coordinated by two coordinated water molecules, two carboxylate oxygen atoms, and two nitrogen atoms from PAH forming a octahedral geometry. The complex features a 2-nodal 2,4-connected network with unprecedented Schläfli symbol of (42)(4)2. In addition, the photocatalytic studies indicate that this complex is a good candidate for the photocatalytic degradation of rhodamine B.
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ENERGY
·
2024
·
IF 9
Yingying Sheng,Fuping Tian,Xiang Wang,Ningyuan Jiang,Xinchi Zhang,Xiao Chen,Changhai Liang,Anjie Wang
The development of highly dispersed non-precious metal nanocatalysts is of great importance for the biomass hydrogenation. In this work, a precursor of Ni-citrate complex was formed by using cheap citric acid as a complexing agent and carbon source, and a highly dispersed nickel catalyst with a carbon-encapsulated structure was successfully prepared by a facile pyrolysis . The catalyst obtained at a pyrolysis temperature of 400 °C (Ni-CA-400) displayed a larger specific surface area, richer defect sites in the carbon layer , and uniform Ni nanoparticles (4.8 ± 0.7 nm). In the furfural (FAL) hydrogenation reaction, Ni-CA-400 delivered a high tetrahydrofurfuryl alcohol yield of 99.8 % under mild conditions (80 °C, 5 mmol FAL, 25 mg catalyst), maintaining relatively constant hydrogenation activity and Ni particle size in five consecutive cycles. The excellent catalytic performance and stability of Ni-CA-400 can be attributed to its unique carbon-encapsulated structure, which not only effectively avoids the migration and aggregation of active Ni particles during the preparation process, but also protects the metal Ni nanoparticles from oxidation in exposure to air. The kinetic studies showed that Ni-CA-400 exhibited high turnover frequency (TOF) for the hydrogenation of both C O and C C, making it a potential industrial catalyst for FAL hydrogenation.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Sixuan Zhang,Jinzhao Huang,Jun Tang,Zehui Liu,Xiaolong Deng
The high entropy alloy (HEA) composed of five or more elements possesses excellent electrochemical hydrogen evolution reaction (HER) performance in alkaline electrolytic water due to the synergistic action of multiple main elements. However, high-entropy alloy catalysts typically have a single structure, and great challenges remain in designing complex structures (heterostructures) to adjust the electron layout to facilitate water decomposition for hydrogen production. Here, we successfully synthesized NiMoCoMnLa@Ni high entropy alloy (HEA/CNTs@Ni) heterostructures electrocatalysts supported on multi-walled carbon nanotubes (CNTs) by a simple two-step low temperature oil phase method. The results showed that the heterogeneous structure of HEA/CNTs and Ni led to electron reconfiguration and accelerated electron transfer rate as well as the optimized hydrogen adsorption energy and the increased number of active sites of catalyst. Therefore, the catalyst showed high electrocatalytic activity and stability for hydrogen evolution reaction. The overpotential is only 146 mV at 10 mA/cm 2 with low Tafel slope of 79 mV/dec in 1 M KOH solution. It is worth noting that the catalyst is maintained at a high current density of 80 mA/cm 2 for 24 h, and its current density does not decrease significantly or even shows a trend of enhancement, which effectively improves its HER performance in alkaline solution. This work provides a valuable guidance for fully exploring the potential of HEA catalyst in alkaline electrochemical hydrogen evolution reactions.
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高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Ze-Yu Jiang,Mao-Jin Ran,Kai Liu,Yi-Fu Huang,Zhi-Rong Li,Ting-Ting Shen,Wan-Ying Li,Shokir Khojiev,Zhi-Yi Hu,Jing Liu,Li-Hua Chen,Yu Li,Bao-Lian Su
Constructing heterojunctions via in-situ growth or mechanical mixing have been widely used for improving the photogenerated carrier separation and photocatalytic activity . However, interface transfer impedance and the charge transfer channels of heterojunction prepared by in-situ method are rarely discussed. In this work, we use tubular g-C 3 N 4 (TCN) as the basic photocatalyst and in-situ growth of nickel/aluminum layered double hydroxide (LDH) nanosheets as co-catalyst on the surface of TCN (TCN@Ni/Al-LDH) to show the advantage of the in-situ constructing heterojunction for highly enhanced photocatalytic hydrogen production . The results show that the TCN@Ni/Al-LDH-60 exhibits the best hydrogen production performance of 1428 μmol h −1 g −1 , which is 53.3 and 21.33 times higher than that of TCN and mechanical prepared TCN/Ni/Al-LDH-60. For the first time, we propose a statistics model to reveal that the contact area of the heterojunction TCN@Ni/Al-LDH-60 is 2.88 times that of TCN/Ni/Al-LDH-60. This largely increases the charge transfer channels for the photogenerated carrier transport. In addition, the in-situ growth of TCN@Ni/Al-LDH composites increases the active sites, which improves the utilization efficiency of the photogenerated electrons. This study would shed some light on analyzing the in-situ constructing heterojunction photocatalysts for efficient photocatalytic hydrogen production through photocatalytic water splitting.
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高影响因子
JOURNAL OF POROUS MATERIALS
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2024
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IF 2.5
Xue Changhao,Hou Xiaohui,Sun Weijie,Yuan Xia
The acidic molecular sieve carrier Hβ supported non-noble metal catalyst Ni/Hβ was prepared by equal volume impregnation method and applied to the hydroalkylation of benzene to cyclohexylbenzene. The effects of calcination procedures on the particle size of Ni and the dispersion degree of metal on the carrier were investigated. Compared with the samples reduced by hydrogen after calcination, the active site Ni of Ni/Hβ obtained by direct thermal reduction in hydrogen is mainly dispersed on the surface of the carrier, with better metal dispersion and smaller particle size of Ni. Under the optimized reaction conditions, the initial pressure of H 2 is 2.5 MPa, the amount of catalyst is 4% of the total reaction liquid, and at the reaction temperature 190 °C for 3 h, the conversion of benzene is 38.4%, the selectivity of cyclohexylbenzene is 72.8%, the selectivity of cyclohexane is 5.2%, the selectivity of dicyclohexylbenzene is 16.5%, and the selectivity of other by-products decreased to 5.5%. After the catalyst was reused for 5 times, the conversion of benzene and selectivity of cyclohexylbenzene were both have a slight decrease. Characterization results showed that the structure of the recovered catalyst was stable, but the specific surface area and pore volume decreased significantly, the resulted problem of catalyst pore blockage can be restored through calcination treatment.
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高影响因子
ENERGY & FUELS
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2024
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IF 5.2
Xin Zhang,Zaiman Zhang,Hao Li
The aqueous hydrodeoxygenation (HDO) of renewable biomass is an effective method to produce alternative fuels and high-value-added chemicals. Nonetheless, metal leaching and support collapse are the main obstacles in aqueous HDO. Herein, a series of Ni/T-Nb2O5@C catalysts were successfully prepared for selective HDO of vanillin (a typical lignin-derived model compound). Characterization results revealed that the superior catalytic performance of Ni/T-Nb2O5@C catalysts was due to the efficient adsorption of the reactant preferentially via oxygen vacancies and the excellent selection of deoxygenated products via acid sites on the catalyst surface. Meanwhile, water can interact with vanillyl alcohol (VA) through hydrogen bonding to form a more stable transition state, further reducing the activation energy of the VA hydrogenolysis process and promoting the conversion of VA to 2-methoxy-4-methylphenol (MMP). Ni/T-Nb2O5@C2-2 catalyst exhibited excellent performance for vanillin HDO, achieving 99.9% conversion, 96.6% MMP selectivity, and 87.7% mass yield at 150 °C for 1 h, 1 MPa H2, and a water:ethanol ratio of 8:12, which greatly improved the MMP selectivity (79.2%) of unmodified Ni/T-Nb2O5 catalyst. Moreover, the catalyst had good catalytic capability after eight cycles of less than 25% conversion, and the retention of the initial active substance during the reaction was analyzed. This work may provide insights into the rational design of composite-supported catalysts for biomass-derived compounds HDO in the aqueous phase.
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高影响因子
Crystals
·
2024
·Vol. 14
·期 8
·728
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IF 2.4
Boyu Wang,Zhiyuan Jiang
Recently, there has been a growing interest in skutterudite (SKD) compounds containing electronegative elements such as Br, Cl, S, Se, and Te, owing to their increased diversity and the versatility of filler atoms. This study focused on the thermoelectric performance of a series of (Ni, Te) co-doped SKDs filled with the electronegative element S, denoted as SxNi0.4Co3.6Sb11.2Te0.8(x= 0, 0.1, 0.2, and 0.3). These compounds were prepared using a combination of a solid-state reaction and spark plasma sintering techniques. The results showed that (Ni, Te) co-doping introduced excess electrons in the SKD lattice, while the incorporation of the element S into the SKD voids optimized carrier concentration. This led to a considerable increase in the absolute Seebeck coefficient to 110.6 μV K−1at ambient temperatures. The presence of S fillers induced phonon resonance scattering and point scattering, which reduced lattice thermal conductivity and ultimately improved the thermoelectric figure of meritzT, which reached 0.93 for S0.3Ni0.4Co3.6Sb11.2Te0.8at 823 K.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xiaowei Ma,Lin Tan,Jiaqi Xu,Jiaoyang Hao
Metal–organic frameworks (MOFs) exhibit highly adjustable porosity, structure, and versatility, properties that render them promising for electromagnetic wave (EMW) absorption applications. However, the impedance matching of these composites is poor in practical applications, thereby compromising their EMW absorption performance. In this study, a novel EMW absorbing composite was synthesized by a solution-thermal method combined with a subsequent pyrolysis process. Specifically, we introduced heteroatom (N and S) codoped graphene (N, S-Gr) into the Co–Ni MOF, forming N, S-Gr/CoNi/C. Graphene was endowed with abundant defect and disorder sites through the codoping of nitrogen and sulfur, which enhanced interfacial polarization and dipole polarization. When nickel and cobalt were added in a 1:1 ratio, the minimum reflection loss (RLmin) of the N, S-Gr/Co–Ni/C composite reached −47.7 dB at 4.24 GHz, and the resultant material exhibited the best absorption properties. As a result, this composite is considered to be an ideal candidate for the development of highly effective EMW absorbers.
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PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Jiajia Wan,Di Sun,Peng Li,Junjun Huang,Zhenming Chen
With the frequent increase and update of electromagnetic interference (EMI) shielding materials, a low-resolution material that can absorb most electromagnetic waves, thereby effectively reducing the secondary pollution, is urgently needed. However, the excellent performance, flexibility, and low cost of these methods are usually incompatible with current reports. To address the above dilemma, we reported a facile solution for fabricating a low-reflection and high-performance EMI shielding composite by means of electroless nickel plating (EP-Ni), electroless copper plating (EP-Cu), annealing, and coating with a polydimethylsiloxane (PDMS) polymer with the structure of a Ni@Cu tube encapsulated with PDMS. The results indicate that the active groups on vegetable wool can act as active sites for the absorption of the Pd catalyst, thereby catalyzing the reduction of Ni2+, Cu2+, and the subsequent deposition on the plant fiber surface. Notably, the Ni@Cu-encapsulated plant fibers decreased during annealing at 100 °C. According to the segregated network and synergistic effect of the porous structure, the as-fabricated EMI shielding material demonstrated high absorption and low reflection, in which the power coefficient of the T value was approximately 0.0001, the R value was about 0.1764 (a decrease of 27.5% compared that of EP-Ni cotton), and the A value was approximately 0.8235.
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PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Zhigao Ma,Bingyan Jiang,Dietmar Drummer,Lu Zhang
An electrolyte solution incorporating sodium saccharin and an alkynyl compound was provided to electroform Ni-P-PTFE mold inserts with both low internal stress and good self-lubricating properties. The results showed that with 5 g·L −1 sodium saccharin and 1 mL·L −1 alkynyl compound, the internal stress reached a minimum of −114 MPa, an 82 % reduction from the −646 MPa observed without additives. The presence of sodium saccharin and alkynyl compound in the electrolyte solution reduced the hydrogen evolution reaction current from 15.2 to 12.9 mA at the operating cathode potential of −1 V and decreased the RTC (111) from 100 % to 90 %. The reduction of internal stress in the electrodeposited Ni-P-PTFE composites was attributed to the decreased hydrogenation strain, diminished Ni (111) texture intensity, and the partial incorporation of alkynyl compound reaction products into the deposits, which weakened the connections between crystallites. Finally, 5 g·L −1 sodium saccharin and 1 mL·L −1 alkynyl compound was applied to electroform Ni-P-PTFE mold insert with micro features. Only slightly pile-up defects at the corner of grooves were observed on the polymer chips demolded from Ni-P-PTFE mold insert, demonstrating its good self-lubricating property.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jindou Hu,Yali Cao,Jing Xie,Dianzeng Jia
To reduce the cost of the traditional noble metal-loaded photocatalysts for H 2 production, low-cost Ni(OH) 2 -TiO 2 nanocomposites were designed and synthesized by a simple room-temperature solid-state chemical method (RSCM), which is a facile, low-cost and eco-friendly manipulation. Various testing methods and tools were used to characterize the crystal structure, elemental composition, morphology, light absorption ability, fluorescent performance, photocurrent density, and photocatalytic activity of the obtained nanocomposites. The results indicated that RSCM can be used to synthesize Ni(OH) 2 -TiO 2 nanocomposites with a small size (50 nm) and good dispersity. Compared to pure TiO 2 , the obtained nanocomposites displayed excellent photocatalytic performance for H 2 production by photocatalytic water-splitting. The amount of hydrogen needed for the optional nanocomposite NOT-1 was 9180 μmol/g, which is 29 times that of the commercial P25. The reason for the improved performance for photocatalytic hydrogen production is that the existing Ni(OH) 2 in nanocomposites promoted the separation between the photogenerated electron and holes.
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高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Xinbo Zhao,Zan Li,Yuye Dou,Xiaohui Jiang,Fan Bu,Zhenxia Liu,Liangmin Yu
Antibiotic wastewater poses a significant threat to the global environment and human health. In this work, Ni-Ti bimetallic Metal-Organic Frameworks (NT-MOF) were synthesized as effective photocatalysts to remove tetracycline (TC) from water under visible light irradiation. The photocatalysts underwent characterization using techniques such as Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), N 2 adsorption-desorption, and X-Ray Photoelectron Spectroscopy (XPS). Photocatalytic tests were conducted under visible light conditions (λ>420 nm). The enhanced performance is mainly due to the presence of Ni in NT-MOF changing the shape and structure of the samples, reducing electron-hole recombination, thus promoting the charge separation process. These findings have significant implications for the development of efficient and sustainable methods for the removal of TC from wastewater.
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高影响因子
危险品化学品经营许可证（带存储）