CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Gang Li,Ruiyang Tan,Xiangcheng Lu,Xinyu Zhang,Chengcheng Zhang,Bohong Gao,Yuting Zhou,Ke Chen,Ping Chen,Xinyi Wang
Chemical composition and morphological optimization are both effective strategies for constructing excellent electromagnetic wave absorption (EMWA) materials. While efficient EMWA materials derived from both metal-organic frameworks (MOFs) and MXenes have been extensively studied, composites derived from the Hofmann framework with MXene have not been reported. In this study, we employed a Hofmann framework ([Fe(pz)Ni(CN) 4 ], pz = pyrazine) and MXene (Ti 3 C 2 T x ) to create new MXene@Hofmann (MH1 and MH2) composites, using a simple co-precipitation method with two different contents of [Fe(pz)Ni(CN) 4 ]. The FeNi/C/TiO 2 composites with a multi-layered structure inherited from MXene were prepared by annealing the MXene@Hofmann composites at 500, 600, and 700 °C, resulting in the formation of MH1-500/600/700 and MH2-500/600/700 composites. Their compositions, morphologies, electromagnetic parameters, and EMWA performances were characterized. For the composites with a high [Fe(pz)Ni(CN) 4 ] content, MH2-600 has a minimum reflection loss ( RL min ) value of −30.63 dB at a thickness of only 1.8 mm and the broadest effective absorption bandwidth (EAB) of 3.90 GHz at 2.0 mm, while MH2-700 exhibits superior EMWA performance with an RL min value of −34.34 dB at 1.9 mm and an EAB value of 4.96 GHz at 2.1 mm. Their impressive EMWA performance might be attributed to the synergistic dielectric loss and magnetic loss and also the impedance matching from the reasonable ratio of the magnetic and dielectric components. This work demonstrates an effective strategy for constructing EMWA materials from the Hofmann framework and MXene.
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高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 20
·3066-3078
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IF 3.1
Jinyu Ma,Qing Sun,Chuan Jing,Faling Ling,Xiao Tang,Yanhong Li,Yongjie Wang,Sha Jiang,Kexin Yao,Xianju Zhou
Since the energy density and voltage window of supercapacitors cannot match that of lithium-ion batteries, supercapacitors are far from replacing batteries but can only be seen as a supplement to battery charge storage or transmission devices. The design of transition metal oxide-based electrodes with high cycling capacitance retention is very important for the development of supercapacitors. In this study, flower-like SAC@NiCoMn-LDH electrode materials with different Mn doping ratios were prepared by a hydrothermal method with mesoporous carbon (SAC) as the substrate. Density functional theory (DFT) calculations confirm that Mn doping can enhance the adsorption of OH− and the desorption of the H proton. In addition, Mn doping increases the density of states of LDH near the Fermi level and increases the number of active electrons, which is conducive to the occurrence of electrochemical reactions. In the three-electrode system, SAC@Ni2Co0.95Mn0.05-LDH with optimal doping ratio increased the specific capacitance by three times compared to that of NiCo-LDH and displayed an excellent cycling stability (83.76% capacitance retention after 50 000 cycles). Moreover, the prepared SAC@Ni2Co0.95Mn0.05-LDH and commercial activated carbon (AC) were made into electrode plates and then assembled into a SAC@Ni2Co0.95Mn0.05-LDH//AC asymmetric supercapacitor (ASC). The ASC exhibited high energy density (23.68 W h kg−1 at 325 W kg−1) and excellent specific capacitance retention (85.32% after 50 000 cycles), making it well suited for efficient wind energy storage and conversion with promising practical applications.
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高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Zhiwen Xu,Guangyu Chen,Fei Yang,Juhee Jang,Guimei Liu,Fei Xiao,Yan Sun,Xiaoyi Qiu,Weiwei Chen,Dong Su,Meng Gu,Minhua Shao
The development of inexpensive and high-performance bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of crucial significance for rechargeable metal-air batteries , but remains challenging. Herein, we report an ingenious bifunctional oxygen electrocatalyst integrating ZIF-derived carbon-anchored Fe/Ni single atoms, FeNi alloy nanoparticles , and graphene support (denoted as Fe/Ni-NC||FeNi@G). Synergizing highly active Fe single atoms for the ORR and highly efficient FeNi alloy nanoparticles for the OER, the as-constructed Fe/Ni-NC||FeNi@G catalyst exhibits outstanding bifunctionality; the potential gap between the OER potential at 10 mA cm –2 and the ORR half-wave potential is only 0.618 V, outperforming the benchmark Pt/C + Ir/C catalyst and most transition metal-based bifunctional catalysts reported in the literature. More importantly, the Fe/Ni-NC||FeNi@G-driven zinc-air battery (ZAB) delivers a maximum power density of ∼200 mW cm –2 , a specific capacity of 876 mAh g –1 , and excellent cycling stability with negligible voltage decay up to 500 hours (3000 cycles). This work provides an effective approach to designing highly efficient non-noble metal multifunctional catalysts for practical applications in rechargeable metal-air batteries.
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高影响因子
CARBON
·
2023
·
IF 10.9
Wen-Gang Cui,Xiaodi Zhou,Biao Zhao,Wenbin You,Yaxiong Yang,Bingbing Fan,Limin Wu,Renchao Che
Recently, the three-dimensional (3D) porous cellular foam derived from poly (vinylidene fluoride) (PVDF) via a simple CO 2 -assisted procedure has been widely applied as electromagnetic (EM) wave absorbing materials due to its one-step preparation process and high void fraction. However, delicate control of 3D microcellular structure by decoration of dielectric/magnetic components is still virgin. Herein, the hierarchical structure of 3D PVDF foam decorated with an ultra-low content of graphene nanoplates (5.0 wt%) and Ni nanochains (2.4 wt%) was successfully fabricated. The correlation between microcellular structure, and electrical conductivity/microwave absorption was systematically investigated. After introducing the conductive and magnetic components, a strong enhancement of dielectric loss, coming from the presence of conduction loss and polarization loss of 3D network, and magnetic loss, originating from strong eddy current loss and the natural resonance, was observed. Meanwhile, a high void fraction (∼92%) greatly optimized the impedance matching of incident waves and favored the multi-scattering. As a result, the superior microwave absorption was obtained, in which the effective absorption bandwidth (frequency with 90% microwave dissipation) can cover the whole K band (18–26.5 GHz) under the thickness of 3 mm. Overall, this work provides an ameliorated strategy for porous foams applied in microwave absorption.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Peng Zhang,Yuhui Zhao,Jiale Huang,Jie Li,Lin Cao,Jianan Liu,Guofeng Han,Wenbo Du,Lihua Chen,Linlin Xiao,Qiwei Wang,Yingfei Yang,Sheng Zhu,Wei Li
Ni-W-SiC composite coatings with mixed nano- and micro-sized SiC particles are prepared by the pulsed electrodeposition . The microstructure, microhardness , wear and corrosion resistances of the composite coatings were studied as a function of the mixed ratios of nano- to micro-sized SiC. The results showed that the nano-sized SiC can be carried by micro-sized SiC during the deposition process, resulting in a greater amount of nano-sized SiC being incorporated into the composite coatings without agglomeration. The wear resistance of the composite coatings with a mixture of nano- and micro-sized SiC is improved. The highest microhardness is obtained on Ni-W-SiC coating containing a ratio of nano- to micro-sized SiC particles of 1:3. However, as a result of the blockage of the Faradaic current by the inert SiC particles, composite coatings with the highest total SiC content exhibited the best corrosion resistance. Discussions are conducted in detail regarding the effects of mixture particles on microstructure, microhardness, wear and corrosion resistance of the composite coatings. Moreover, the interaction between the nano- and micro-sized SiC during the deposition process are also discussed.
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ENERGY & FUELS
·
2023
·
IF 5.3
Wenqi Li,Yongli Shen,Linxiu Dai,Changhua An
Rational design of highly efficient catalysts for the dehydrogenation of ammonia borane (AB) to produce hydrogen is still challenging. The size and shape effects of catalysts on the performance have been well documented in the past decades. Nevertheless, there is still much space for study on the crystal structure-dependent catalytic performance. Herein, In2O3-supported hexagonal-close-packed (hcp) Ni (hcp-Ni/In2O3) has been prepared via impregnation of corresponding nanoparticles onto In2O3. The stronger electronic metal–support interaction in hcp-Ni/In2O3 than in fcc-Ni/In2O3 endows it with high capacity to activate AB molecules. It exhibits excellent hydrogen evolution activity from catalytic dehydrogenation of AB with a rate of 7.5 molH2 mol–1Ni min–1, which is 1.7 times that of the supported fcc sample. The systematic experiments and DFT calculations demonstrate that the hcp catalyst possesses stronger hydrophilicity and lower activation energy for the dissociation of H2O than the fcc counterpart. Moreover, the assistance with sonication enhances the process of mass and heat transfer and accelerates the reaction. This work provides a new way for the achievement of efficient metastable catalytic systems and promotes the construction of advanced devices toward various applications.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Zhenglong Xue,Qimeng Liu,Guanhua Wang,Wenjie Sui,Ashak Mahmud Parvez,Chuanling Si
Lignin hydrogenolysis into monophenols presents a promising route for lignin-based chemical and fuel production but still suffers from harsh reaction conditions (e.g. high temperature and high external H 2 pressure). Herein, we report an ultrafine Ni nanocluster anchored on N-doped carbon nanosheets (Ni/LNC) for efficient catalytic transfer hydrogenolysis of poplar organosolv lignin . The catalyst was fabricated through a simple pyrolysis process of lignin‑nickel complex mixed with melamine , in which the lignin coordination greatly improved the Ni dispersion and the strong Ni N interaction inhibited the Ni nanocluster growth, resulting in the ultrafine particle size (1–2 nm). Under mild conditions (160 °C, 1 h), 22.08% of monophenol yield was obtained over the catalyst, which was significantly higher than those over the two reference catalysts (Ni/AC and Ni/LC) as well as other previously reported Ni-based catalysts. The excellent catalytic activity can be attributed to both the substantial increase in catalytic active sites and the enhancement in H transfer from methanol resulted from the electron-rich N-doped nanosheet support. Finally, magnetically recycled Ni/LNC showed excellent recycling stability. Consequently, this work presents a facile and low-cost approach for the synthesis of N-doped carbon nanosheet supported ultrafine Ni nanocluster and further demonstrates its superior applicability in lignin hydrogenolysis.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Guoguo Wang,Qiuyue Chen,Jing Zhang,Xuguang An,Qian Liu,Lisi Xie,Weitang Yao,Xunping Sun,Qingquan Kong
As an eco-friendly and sustainable strategy, the electrochemical reduction of nitrite (NO 2 – ) can simultaneous generation of NH 3 and treatment of NO 2 – contamination in the environment. Herein, monoclinic NiMoO 4 nanorods with abundant oxygen vacancies self-supported on Ni foam (NiMoO 4 /NF) are considered high-performance electrocatalysts for ambient NH 3 synthesis by reduction of NO 2 − , which can deliver an outstanding yield of 18089.39 ± 227.98 μg h −1 cm −2 and a preferable FE of 94.49 ± 0.42% at −0.8 V. Additionally, its performance remains relatively stable during long-term operation as well as cycling tests. Furthermore, density functional theory calculations unveil the vital role of oxygen vacancies in promoting nitrite adsorption and activation, ensuring efficient NO 2 – RR towards NH 3 . A Zn-NO 2 – battery with NiMoO 4 /NF as the cathode shows high battery performance as well.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lei Han,Jing Ma,Hongjun Lin,Cheng Chen,Jiaheng Teng,Bisheng Li,Dieling Zhao,Yanchao Xu,Wei Yu,Liguo Shen
The recycling of wastewater containing multiple pollutants is an urgent issue that requires sustainable and effective solutions. Gravity-driven membrane separation is a highly promising technology due to its low energy consumption, low transmembrane pressure, and ease of operation. To further enhance its advantages, this work explores the use of metal-organic frameworks (MOFs) for membrane modifications, which possess a porous structure, stable chemical properties, and high specific surface area. Specifically, flower-like nickel-based MOF particles were synthesized and assembled on a nylon membrane to prepare a novel Ni-MOF membrane. The Ni-MOF membrane displayed superhydrophilic properties, as evidenced by a water contact angle of 0°, and underwater superoleophobic properties, with an underwater oil contact angle of 154.37°. The Ni-MOF membrane demonstrated a significantly improved rejection rate for four types of dye solutions, particularly Congo red solution, which was rejected at a rate of 97.71% only through gravity-driven separation. Additionally, the Ni-MOF membrane exhibited exceptional performance for oil-water emulsion and microplastic wastewater, which was evidenced by the rejection of 95% and 99%, respectively. Moreover, the cycling tests revealed that the Ni-MOF membrane equipped long-term stability. These data demonstrated the Ni-MOF membrane had broad application prospects in the separation of wastewater containing multi-component pollutants.
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高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Yixue Yang,Qiang Hu,Guimin Zhang,Xun Xie,Yuxin Liu,Liming Zhou,Kejing Wu,Houfang Lu,Bin Liang
Supported Ni on yttria stabilized zirconia (YSZ) is the most widely used anode for a solid oxide fuel cell (SOFC), where Ni particles are easy to agglomerate at a high temperature of 1400 °C and reductive hydrothermal environments. In this study, Ni particles are successfully dispersed on YSZ through strong interaction between Ni and SiO2. The thin and amorphous SiO2 films, grown by low-temperature chemical vapor deposition (CVD), become spherical particles of nickel silicates uniformly dispersed on the YSZ skeleton after sintering at 1400 °C. Also, the SiO2-anchored Ni particles supported on YSZ (Ni/YSZ-SiO2) are obtained via direct reduction. The electrochemical performance of the Ni/YSZ-SiO2 anode shows a higher power density of approximately 18% than an unmodified Ni/YSZ anode, which resulted from the longer effective TPB area assigned to the highly dispersed Ni particles. The microstructure containing SiO2-anchored Ni particles exhibits high stability under testing and reductive hydrothermal conditions. Accordingly, the method of growing a SiO2 layer via low-temperature CVD is considered as a probable route for the preparation of the Ni/YSZ electrode material with a well-defined microstructure.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jun Chen,Boding Zhang,Bingxing Wang,Chengxing Cui,Songlin Wang,Jichao Wang,Wenlong Zhang
With high toxicity, carcinogenicity and teratogenicity, quinoline has been threatening human health and ecological environment. Herein, Fe-Co-Ni-P/g-C 3 N 4 particles are developed as electrochemical reactors to form a three-dimensional catalytic particle electrode system (3D-CPE) for efficient removal of quinoline from wastewater by electro-Fenton (EF) oxidation process. with reaction time of 30 min, the particles dosage of 50 g/L, pH of 3, conductivity of 11.5 ms/cm, and current density of 37.04 mA/cm 2 , the chemical oxygen demand (COD) removal rate can up to 90.95%. In addition, electron paramagnetic response (EPR) and radical scavenging tests are performed to determine the hydroxyl radicals of electrochemical processes produced. The degradation products are analyzed by high performance liquid chromatography-mass spectrometry (HPLC-MS). Finally, through theoretical calculation and analysis of degradation products, a reasonable degradation mechanism is proposed.
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高影响因子
BIOMASS & BIOENERGY
·
2023
·
IF 6
Jiubing Zhang,Bo Chen,Yuanyuan Ge,Zhili Li
The efficient depolymerization of lignin for the production of high-value chemicals is essential for the development of a sustainable and competitive biorefinery . In this study, we report the preparation of homologous biochar-supported inlaid Cu–Ni catalysts (Cu x Ni y /BC) using a one-step method, and their application for lignin depolymerization in mild water without the need for external hydrogen, additives, or co-catalysts. The Cu 1 Ni 3 /BC (0.05 g catalyst, 8 h, 280 °C, and 18 mL water) showed exceptional catalytic activity , with a monophenol yield of 94.35 ± 2.92 mg/g, bio-oil yield of 68.98 ± 1.42%, and a lignin conversion rate of 92.36 ± 1.99%, which outperformed both the biochar support and monometallic catalysts. The outstanding catalytic performance of Cu 1 Ni 3 /BC was attributed to its strong metal-support interaction, alloy sites, and well-dispersed nanoparticles . Reusability experiments demonstrated that the Cu 1 Ni 3 /BC exhibited relatively good stability for up to four reuses, with only a 2.32% reduction in catalytic activity per cycle. Mechanism investigation revealed that the Cu 1 Ni 3 /BC, with its abundant mesoporous structure and enhanced acid sites, displayed excellent deoxygenation ability, enabling effective cleavage of C–O/C–C bonds and the production of G-type phenols . This approach provides new insights into the large-scale utilization of lignin for the production of high-value chemicals.
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高影响因子
危险品化学品经营许可证（带存储）