FUEL
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2024
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IF 6.7
Wenjing Zhang,Tinghu Wang,Yiming Gao,Yaru Xue,Furang Li,Chuanrui Pang,Jianye Fu,Xinmei Liu,Yuchao Lyu
The catalytic performance of bifunctional catalyst for one-step hydrodeoxygenation of fatty acid esters to bio-jet fuel is contingent upon the features of metal component and acid support. However, it remains challenging to simultaneously modulate these structural features with the impregnation method. Herein, the metal particle size, pore structures and acidity of Ni/Beta catalysts are regulated simultaneously during the citric acid-assisted impregnation process. The particle size of Ni over the Ni/Beta catalyst is greatly decreased due to the steric and coordination effect of citric acid on metal. The electron density of the small Ni particle is reduced by the enhanced electron transfer between Ni and Beta. Besides, the dealumination effect of citric acid on Beta zeolite reduces strong Brønsted acid sites and introduces 0.85 times more mesopores into the Ni/Beta catalyst, compared with the counterpart obtained by conventional impregnation method. The enhanced metal dispersion over the Ni/Beta catalyst promote hydrodeoxygenation of reactants and favor hydrodecarbonylation reaction path. The reduced Brønsted acid sites and abundant mesopores inhibit cracking of intermediate and products. The space–time yield of C 12 and C 11 reaches 33.4 mmol·g −1 ·h −1 in hydrodeoxygenation of methyl laurate which is the highest value reported.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Linyun Zhang,Yijing Sun,Shanxin Li,Xuzhou Jiang,Hongying Yu
M−Mo−N (M = Co, Ni) bimetallic nitrides, known for their distinctive mechanical, magnetic and electrical properties, hold significant potential as microwave absorption (MA) materials. However, it remains challenge to obtain high-performance microwave absorbers from these bimetallic nitrides. In this work, the rod-like MoO 2 /Co 2 Mo 3 N/Co 3 Mo 3 N/Ni 3 Mo 3 N (MoCoNi) composites consisting of connected nanoparticles are fabricated in situ. The plentiful interfaces between the connected nanoparticles and between the different components effectively enhance the interfacial polarization, the rod-like structure benefits to conduction loss, and crystal defects facilitate strong dipole polarization. Therefore, MoCoNi composites achieve outstanding absorption properties with the reflection loss of −55.69 dB at 8.08 GHz and the effective absorption bandwidth of 6.48 GHz (11.36–17.84 GHz) at 2.4 mm. The actual MA performance of MoCoNi composites is verified through radar cross section simulation. This study proposes a novel approach for the utilizing of M−Mo−N (M = Co, Ni) bimetallic nitrides in microwave absorptions.
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
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IF 4.4
Peng Song,Shutong Hou,Bo Gong,Jingjing Zhao,Mingcong Zhu,Hui Liu,Hui Zhao,Tao Wu,Xixi Zhu,Qingyun Liu
Tetracycline (TC) is extensively employed as a broad-spectrum antibacterial agent, and its byproducts have been identified in a variety of water bodies, posing a significant risk to both aquatic ecosystems and human health. Among the prevalent techniques for treating water contaminants, photodegradation stands out. In this research, we synthesized a novel nanocomposite material, embedding bimetallic nanoparticles onto halloysite nanotubes (HNT) (Pd@Ni/N-HNT), aimed at photocatalytically degrading TC. The Pd@Ni/N-HNT demonstrated the capability to enhance the TC degradation efficiency to 100 % under visible light for a duration of 120 min, effectively doubling the performance of pure H 2 O 2 degradation. The influence of pH levels in aquatic environments on the TC degradation efficiency was explored. Through electron spin resonance (EPR) studies and free radical scavenging tests, it was verified that •O 2 − and h + are pivotal in the degradation process. Furthermore, Pd@Ni/N-HNT showcased effective degradation capabilities in both tap and river water, achieving degradation rates exceeding 70 % in 120 min and 95 % in 180 min, respectively. This investigation not only sheds light on the potential of utilizing Pd@Ni/N-HNT as a potent catalyst for the photocatalytic degradation of TC but also offers a comprehensive framework for the future development of nanomaterials aimed at the environmental remediation of organic pollutants. The findings herein provide a pivotal reference and guide for advancing the application of nanotechnology in the purification of water, thereby contributing to the safeguarding of aquatic ecosystems and public health.
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高影响因子
FUEL
·
2024
·
IF 6.7
Zhixian Bao,Dekang Li,Zhiheng Wang,Yuxin Wen,Lijun Jin,Haoquan Hu
The lack of detailed functions of different REMs in NH 3 decomposition to H 2 makes the efficient modified catalysts not rationally be designed though many REMs-modified catalysts have been reported. In this work, the 10Ni/A 1 Mg 4 O α (A = La, Ce, and Y) and 10Ni/MgO, in which supports were synthesized by the sol–gel method and Ni was loaded by the wet-impregnate method, were comparatively investigated to reveal the effect of REMs against NH 3 decomposition reaction. The presence of REMs enhanced the activity of 10Ni/A 1 Mg 4 O α and decreased the activation energy as greatly as by half compared to 10Ni/MgO. The produced H 2 in situ has little impact on the activity of 10Ni/A 1 Mg 4 O α , among which Ce has the most excellent H 2 desorption ability. The intrinsic activity of catalysts was improved better by Ce and Y than La and the best Ni particle size is around 6 nm according to TOF, though the Ni particle is the smallest (4.9 nm) in 10Ni/La 1 Mg 4 O α . The surface structure of catalysts was tuned by doping REMs, forming a solid solution and some defects (oxygen vacancies), which enhanced the interaction between active metal and support with obvious electron transfer from support to Ni obtaining a better Ni dispersion and making NiO easier to be reduced. Additionally, the catalysts doped by La or Ce possess more oxygen vacancy due to the changes of La 2 O 2 CO 3 and the valence of Ce, exhibiting stronger basic sites and better N 2 desorption capacity. The study offers a promising strategy for utilizing appropriate or multiple REMs to synthesize effective catalysts effectively for catalyzing NH 3 decomposition in the future.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2024
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IF 2.5
Zhangqiao Zhou,Qi Li,Meiqi Wen,Ruilin Zhou,Xian Wang
The coatings play a crucial role in enhancing the performance of soft magnetic composites (SMCs). This study aims to create coatings for Fe-Ni-Mo SMCs using polysilazane (PSZ) as the precursor. The transformation mechanism of the PSZ/resin mixture is studied by analyzing functional groups and chemical bonds at various temperatures. During the self-polymerization process of PSZ at 350 °C, N–H, C = C–H, Si-H bonds, –CH 3 , and Si-CH 3 groups undergo crosslinking reactions to form C–C and Si-N bonds. When the temperature reaches 600 °C, PSZ polymer cleavage, O-Si-C and Si-N-Si bond dominate in the coating. Additionally, PSZ can effectively enhance the heat resistance of silicone resin through its reaction with Si-OH groups, which has a significant effect on increasing the resistivity of SMCs and reducing high frequency core loss. Optimizing the PSZ content to 0.5 wt% enhances the magnetic properties of Fe-Ni-Mo SMCs, resulting in a μ e of 74.0 at 100 kHz and a corresponding core loss ( P cv ) of 547.7 mW/cm 3 at 100 kHz/100 mT. The findings provide valuable insights for optimizing PSZ content to improve magnetic performance in SMCs.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Leping Cheng,Yuwei Liu,Die Li,Wenjie Xu,Jingbo Jia,Runduo Zhang,Ying Wei,Maria A. Goula,Vagelis G. Papadakis
Thermochemically upcycling waste plastics to value-added products is emerging to alleviate the waste crisis. This study aims to develop highly active and stable Ni-based catalysts for coupling pyrolysis and catalytic reforming of waste plastics to produce syngas. A series of confined NiO@S-1 catalysts with various Ni loadings (5%, 10%, 15%, and 20%) were constructed by employing dissolution-recrystallization strategy. They were in situ reduced and 15%NiO@S-1 sample showed the highest catalytic activity in terms of yield of syngas with high CO selectivity and was superior to 15%NiO/S-1 and 15%NiO/SiO 2 samples prepared by impregnation method. The TEM images of 15%NiO@S-1 catalyst after reaction showed that metallic Ni nanoparticles with average size of 10.1 nm were kept dispersive due to the confinement effect. In contrast, the apparent agglomeration of Ni nanoparticles with average size of 54.9 nm were found on the surface of 15%NiO/S-1 after reaction. This provides an effective strategy for design robust Ni-based confined catalysts for thermochemically upcycling waste plastics.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Hongda Zhang,Miao Pang,Weiyao Yang,Le Sang,Zhiping Zhao
A micro-nano coating with controllable wettability is constructed on Ni foam using the dipping coating method, incorporating organic polydopamine (PDA) and 1H,1H,2H,2H-perfluorodecyltriethoxysilane, and inorganic SiO 2 nanoparticles. PDA has the properties of controlling wettability, strong adhesion, and abundant grafting sites. The water contact angle (WCA) of modified Ni foam is controlled in the range of 0–151.5°. The stability measurement displays that modified Ni foam packings exhibit excellent acid and alkali resistance as well as mechanical stability to fluid erosion under microenvironment. Compared with non-modified (131.5°) and superhydrophilic (0°) Ni foam packings, the maximum ratios of mass transfer enhancement for the superhydrophobic (151.5°) Ni foam packing are 35.6 % and 160.2 %, respectively. Empirical correlations of the gas–liquid mass transfer coefficient and friction factor are established considering the effect of the WCA, and errors between predicted values and experimental values are within ± 15 % and ± 10 %, respectively.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yang Liu,Xinyu Sun,Ying Wang,Shiqing Zhang,Fang Liu,Shaokai Ma,Jun Zhang,Ying Li,Yanming Xue,Chengchun Tang
Birnessite (δ-MnO 2 ), inspired by biological photosynthesis, holds promise as oxygen evolution reaction (OER) catalysts in water electrolysis for clean energy. Given that Mn 3+ serves as the active sites, various strategies have been employed to increase the Mn 3+ content to boost the OER activity. To surpass the limitations of the traditional adsorbate evolution mechanism (AEM), we have adopted an electrochemical reduction method to introduce metallic Ni and enrich oxygen vacancies onto δ-MnO 2 nanosheets. The resulting Ni/MnO 2 v /CC exhibits exceptional OER performance, with a reduction in overpotential by 190 mV (from 478 mV to 289 mV) at 10 mA cm −2 and a Tafel slope as low as 45 mV dec -1 , indicating accelerated catalytic activity. Experimental and theoretical analyses attribute this enhancement to a transition from the traditional AEM to lattice oxygen mechanism (LOM) mechanism. Moreover, the dual modification also enhances electronic conductivity, electrochemical surface area, and charge transfer ability of δ-MnO 2 . Our work offers a pathway to overcome conventional limitations in OER electrocatalysts, applicable not only to Mn-based catalysts but also to a range of other transition metal oxides.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yucheng Wu,Yanli Yu,Wei Shen,Yimin Jiang,Rongxing He,Ming Li
Developing simple and energy-saving pathways to prepare high-efficient and robust non-noble metal based electrocatalysts remains a huge challenge to hydrogen production from seawater electrolysis. Here we demonstrate a facile hydrothermal-calcination-etching approach that simultaneously achieves the required surface N doping and Fe vacancies generation to activate the Ni-O-Fe active motifs in N -v Fe -NiFe 2 O 4 /NF. The unique localized environments (Ni- N -Fe structures and unsaturated O- and N -coordination) due to dual-defect strategy can effectively regulate the electronic structure of the Ni-O-Fe motif to make the motif more reactive. As a result, the N -v Fe -NiFe 2 O 4 /NF catalyst exhibits overpotentials of 210, 213 and 222 mV to deliver 100 mA cm −2 in 1.0 M KOH, simulated seawater and alkaline seawater environments, respectively. Theoretical calculations prove that the Ni-O-Fe structure is the active motif and that the presence of special localized environments can optimize the adsorption of key intermediates on the activated active motifs.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Zhichao Ma,Chenyi Wang,Tianfang Yang,Gangya Wei,Jinrui Huang,Mengran Liu,Kun Zhang,Zunjie Zhang,Yang Liu,Shuyan Gao
Electrocatalytic nitrate (NO3−) reduction to ammonia (NH3) (NRA) is of great significance for solving the problem of urgent NO3− pollution in the environment and opening up a new route to synthesize NH3. However, NRA is limited by its multi-electron/proton transfer process and the NRA process relies heavily on atomic H* produced by H2O splitting, undergirding the necessity for effective NRA catalysts. Herein, three-dimensional (3D) porous phosphorus (P)-doped Cu–Ni alloy materials are constructed through a one-step electrodeposition synthesis. 3D porous materials modulate hydrophilicity and enrich active sites. The Cu d-band center can be tuned through Ni alloying to modify the adsorption energies of intermediates such as *NO3−, *NO2−, and *NH2. The hydrogenation evolution capacity of P promotes the hydrogenation process in the atomic H* path and effectively accelerates the NRA reaction rate. Density functional theory (DFT) calculations demonstrate that the charge transfer between the negatively charged Pδ− and the positively charged Niδ+ and Cuδ+ assists in generating more atomic H* for coupling with reaction intermediates, showing an enhanced catalytic activity at low overpotential. The optimal sample exhibits an exceptional NRA performance with an ammonia yield rate of 848.1 μmol h−1 cm−2 and a faradaic efficiency of 96.1%. This work provides a strategy for creating effective NRA catalysts through enhancing the atomic H* reduction strategy.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Dongdong Zhang,Binyuan Tang,Kai Wang,Lin Wang,Kai Tang,Shanliang Chen,Xiaoqiang Zhan,Hongli Yang,Weiyou Yang
Transition-metal-based layered double hydroxides (LDHs) are emerging as one of the most promising candidates with superior oxygen evolution reaction (OER) activity. However, their fabrication under mild conditions remains a significant challenge. Here, we propose a low-cost, high-production-rate strategy for controlled preparation of AlOOH/reduced graphene oxide (rGO) with strong adsorption capacity for transition metal cations, and then in-situ conversion to CoAl-LDH/rGO, NiAl-LDH/rGO and FeAl-LDH/rGO under ambient conditions. Based on Density Functional Theory calculations, it is witnessed that the rational electronic coordination between Co and Al enables the charge absorption by surrounding oxygen atoms, thereby playing a critical role in reducing the adsorption free energy and overpotential of OER intermediates toward efficient OER. Consequently, the resultant CoAl-LDH/rGO hybrids exhibit an overpotential of just 368 mV at the current density of 100 mA/cm 2 , with a low Tafel slope of 43.2 mV/dec. Moreover, under Air Mass 1.5 Global (AM 1.5G) illumination, their solar-to-hydrogen (STH) conversion efficiency of photoelectrochemical system achieves ∼ 11.61 %, with robust operation stability up to 24 h, demonstrating great potential for practical applications as advanced OER catalysts.
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Li Qin,Haifeng Yu,Hujun Zhang,Qilin Cheng,Ling Chen,Hao Jiang
All-dry solid-phase synthesis (ADSPS) is considered an eco-friendly and cost-effective method for preparing Ni-rich Co-poor cathodes, yet slow ion diffusion during the solid-phase sintering process results in agglomerate particles with severe Li/Ni mixing. Herein, a Mg/Sr-codoped and ZrO2-coated single-crystalline LiNi0.73Co0.05Mn0.22O2 cathode with a well-layered structure is fabricated through the ADSPS method. The Sr ions effectively accelerate the ion migration at the grain boundary to facilitate particle coarsening, while the Mg ions act as “pillar ions” to decrease the Li/Ni mixing and improve the structural stability. Moreover, the ZrO2 coating layer can further alleviate the interfacial side reactions to hinder the structure degradation and enhance the particle integrity. Therefore, the resultant single-crystalline cathodes deliver a high reversible capacity of 192.4 mAh g–1 and display an impressive retention of 87.5% after 300 cycles at 0.5 C in a pouch-type full cell. The ADSPS strategy in this work shows great potential for the synthesis of single-crystalline Ni-rich ternary cathodes for Li-ion batteries.
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高影响因子
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