JOURNAL OF CATALYSIS
·
2026
·
IF 6
Denghui Cheng,Yang Gao,Huan Yang,Fuqing Gong,Guohao Yin,Yuyang Luo,Yongqiang Tian,Shuheng Chen,Jingbo Du,Jia Yang,Zhen Huang,De Chen
Ammonia decomposition is an appealing method for on-site hydrogen production, enabling ease of transportation and storage of H 2 . However, the high-temperature and hydrogen-rich environment present a challenge in developing highly efficient and stable catalysts. Hence, this study outlines an exsolution strategy for synthesizing a Ni-based catalyst in intimate contact with CeO 2 . The Ce 10 /NiAl 2 O 4 catalyst exhibits competitive catalytic performance for ammonia decomposition reaction, and achieves a hydrogen production rate of 78.3 mmol g cat −1 min −1 at 550 °C. Importantly, the robust structure of the Ce 10 /NiAl 2 O 4 catalyst ensures that no significant deactivation is observed during the 200-h stability test. HRTEM, XRD, TPD and kinetic studies reveals that the presence of CeO 2 enhances the dispersion of exsolved Ni nanoparticles, modulates the surface basicity of catalyst, reduce the reaction activation energy, promote the desorption of nitrogen/hydrogen species, and subsequently promotes NH 3 adsorption/activation capacity·NH 3 -TPD-MS in combination with in-situ DRIFTS demonstrate that CeO 2 could accelerate the recombination and desorption of N* adatoms, which is the rate limiting step, thereby significantly boosting catalytic performance. Furthermore, the DFT calculations reveal that the interaction between CeO 2 and Ni species facilitates electron transfer toward Ni, lowering the barrier for both N–H dissociation and N* recombination and desorption. This work not only presents an efficient and stable noble-metal-free catalyst for ammonia decomposition to generate hydrogen, but also provide a general strategy to engineer high-performance catalysts applicable to harsh catalytic environments.
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高影响因子
ACS Omega
·
2024
·
IF 3.7
Junhong Liu,Zhitao Liu,Jing Yang,Bin Xu,Feiyun Chen,Xin Liao
The incorporation of nanomaterials generated from Prussian blue (PB) derivatives has emerged as a promising strategy to significantly improve the properties of energetic materials. In this study, we comprehensively investigated the influence of nanomaterials derived from PB on the thermal decomposition characteristics of energetic materials. To achieve this goal, we prepared nanomaterials using coprecipitation and heat treatment methods with PB derivatives as catalysts. Advanced techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller (BET) analysis for specific surface area and pore size, and X-ray photoelectron spectroscopy were employed to thoroughly characterize these nanomaterials. Differential scanning calorimetry was used to assess the thermal behavior of nitrocellulose (NC), and the relevant kinetic parameters were determined through thermal decomposition kinetics calculations and analysis. This work revealed the influence of catalysts on the NC decomposition process and provided comprehensive insights into the effect of integrating nanomaterials derived from PB derivatives on the thermal decomposition performance of NC. The results of this work demonstrated the possibility of using nanomaterials generated from PB derivatives as effective catalysts to enhance the thermal decomposition characteristics of NC, offering interesting opportunities for their application in the field of high-energy materials.
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PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Chaoyue Zhang,Mingrui Wang,Xinyue Han,Zheng Shen,Hongying Zhuo,Tianyu Zhang,Xiaofeng Yang,Yanqiang Huang
Metastable hcp-Ni enables the synthesis of highly dispersed and stable Ni/Al 2 O 3 catalyst • Highly dispersed Ni/Al 2 O 3 catalyst delivers 75.7% CO 2 conversion and 100-h stability • Original hcp-Ni particles spontaneously transform into fcc-Ni clusters of ∼2.3 nm • Small Ni clusters promote CO 2 methanation via monodentate formate intermediate • Fcc-Ni precursors undergo severe sintering to ultra-large and less-active particles Ni-based catalysts are promising candidates for CO 2 methanation while their practical applications are limited by particle agglomeration and deactivation. Here, we report a facile strategy to fabricate a highly dispersed and stable Ni/Al 2 O 3 catalyst using metastable hexagonal close-packed (hcp)-Ni as a precursor. Comprehensive characterization reveals that the initial hcp-Ni (∼12.0 nm) spontaneously transforms into uniform face-centered cubic (fcc)-Ni nanoparticles (NPs) of ∼2.3 nm on γ -Al 2 O 3 support during H 2 reduction and CO 2 methanation reaction. The small Ni particles contribute to improved Ni 0 proportion on catalyst surface. In contrast, the original fcc-Ni precursors are prone to sintering, forming ultra-large and less-active Ni aggregates. The highly dispersed Ni NPs derived from hcp-Ni enhance CO 2 adsorption-activation and facilitate the formate-mediated reaction pathway. The resulting hcp-Ni/Al 2 O 3 catalyst delivers a CO 2 conversion of 58.2% with a CH 4 selectivity of 85.4% at 460 °C and endows robust stability exceeding 100 hours. The optimal CH 4 space time yield reaches 179.5 mmol·g cat −1 ·h −1 , exceeding 2.4 times that of fcc-Ni/Al 2 O 3 . This work establishes a reliable synthesis paradigm rooted in crystal-phase regulation, enabling the manufacture of highly dispersed and stable Ni-based catalysts for efficient CO 2 methanation. Manufacturing Highly Dispersed and Stable Ni/Al 2 O 3 Catalysts from hcp-Ni for Enhanced CO 2 Methanation Download: Download high-res image (221KB) Download: Download full-size image
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Journal of Materials Research and Technology-JMR&T
·
2026
·
IF 7.3
Lei Wang,Han Zhang,Pengfei Xu,Zhihao Liu,Zekun Liu,Bo Wang,Fei Ding,Langping Wang,Yanji Yang,Yong Chen,Yupeng Xu,Dianlong Wang,Bo Wang
Internal stress control is critical for the electroforming of high-precision components such as X-ray focusing mirrors, which typically require stress levels below 0.1 MPa to maintain shape accuracy. Meanwhile, the complex nonlinear interactions among multiple deposition parameters make stress optimization challenging using traditional methods. We propose a machine learning-assisted framework to systematically investigate and optimize the low-stress (<0.1 MPa) electroforming of nickel and nickel-cobalt alloys from sulfamate baths. Among various machine learning algorithms, random forest is identified as the optimal predictive model. Based on this, a processing map correlating current density and cobalt concentration with low-stress conditions is established. SHAP analysis reveals that current density is the dominant factor, followed by cobalt concentration. Combined EBSD, XRD, and DFT calculations elucidate the underlying physical mechanisms. Current density induces grain refinement, while cobalt incorporation promotes solid solution formation, both of which lead to lattice expansion in the nickel structure and consequent tensile stress generation. Finally, finite element simulations guide the optimization of engineering solutions, leading to the successful fabrication of X-ray focusing mirrors with exceptional thickness uniformity (coefficient of variation <2%)
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高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Jize Wang,Ping Mu,Xiongzhuang Jiang,Shaowen cao,Bin Li,Yong Peng
In this study, we present a transparent perovskite-based photoanode consisting of a CsPbBr3-based photogenerated electric field layer and a Ni-Epoxy/Ni layer with integrated multifunctions of light transmission, sealing, charge conducting, and catalyzing. The Ni-Epoxy/Ni layer successfully constructed longitudinal charge transport channels and provided an interface with active sites, while achieving an average visible transmittance of more than 70%. For photoelectrochemical (PEC) water oxidation at 1.23 VRHE in 0.5 M KOH solution, the maximum photocurrent densities of the photoanode were 17.28 and 5.19 mA cm–2 when light was excited from the FTO and the multifunctional layer side, respectively, based on an actual working area of 2 cm2. The photoanode exhibited a 1450 mV shift of onset potential compared with the multifunctional layer. Due to the existence of a high built-in electric field, bias-free complete PEC water splitting was realized, and the peak photocurrent density was 0.46 mA cm–2. The multifunctional layer’s water resistance increased the photoanode’s working time from less than 1 min to more than 30 min.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Xinyu Li,Di Li,Hao Tian,Liang Zeng,Zhi-Jian Zhao,Jinlong Gong
This paper describes the design of a Ni/La 2 O 3 catalyst using La 2 O 2 CO 3 nanorod as a support precursor (denoted as Ni/La 2 O 3 -LOC) via a wet impregnation method for dry reforming of methane (DRM). The results showed that La 2 O 3 derived from the La 2 O 2 CO 3 precursor maintained its initial morphology upon thermal treatment and could highly disperse Ni particles on it. Additionally, the nanorod-shaped support could provide more medium-strength basic sites to facilitate CO 2 adsorption and activation on its surface. Consequently, the Ni/La 2 O 3 -LOC catalyst reached 70% of CH 4 conversion and 75% of CO 2 conversion at 700 °C after 50 h DRM reaction with a H 2 /CO ratio of 0.87. The enhanced metal-support interaction restricted the sintering of nickel particles under harsh reaction conditions. Coke evolution on the catalysts was also investigated to understand coke formation mechanism and the role of La 2 O 2 CO 3 in coke elimination. It has been found that nickel dispersion can affect distribution of coke and La 2 O 2 CO 3 on the surface of catalyst, both of which have a close relation with catalytic performance.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chunmiao Liu,Yanchun Tong,Chang Liu,Haibin Sun,Qiangqiang Hu,Shigang Wu,Yujun Zhao,Jiao Li,Xue Guo,Yurun Feng
SiBCN ceramic materials are widely studied in electromagnetic wave (EMW) absorption. However, their practical application is limited due to the problem of poor impedance matching. In this study, SiBCN (Ni) fibers were successfully prepared by doping magnetic metal Ni, and the absorption properties of the samples were systematically investigated at different high-temperature treatments (1200 °C–1500 °C). The results showed that the doping of Ni contributed to the formation of carbon nanotubes (CNTs), which could enhance the improvement of conductive loss performance. Additionally, the catalytic effect of Ni promoted the formation of various crystals, including Ni 2 Si, β-SiC, Si 3 N 4 , and Si 2 N 2 O, resulting in the presence of multiple heterogeneous interfaces and excellent polarization loss capability. The Ni 2 Si particles acted as magnetic loss units, thereby enhancing the impedance matching of the fibers. Consequently, the SiBCN (Ni) sample prepared at 1300 °C exhibited a minimum reflection loss (RL min ) of −21.38 dB and an effective absorption band (EAB) of 3.68 GHz. In addition, SiBCN (Ni) fibers coating proved effective in reducing Radar Cross Section (RCS) signals. Therefore, these findings suggest that SiBCN (Ni) fibers have the potential to serve as EMW absorbers in military radar and satellite communication.
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高影响因子
TRANSITION METAL CHEMISTRY
·
2023
·Vol. 48
·期 2
·125-133
·
IF 1.7
Hu Yi,Xu Jingsong,Zhang Tianzhu,Zhong Hang,Chen Jun,Liu Xinai,Pan Qifa,Liu Ruidong,Jiang Chunli,Chen Jun
Electrocatalytic water splitting to produce hydrogen is a promising route to provide green hydrogen on a large scale. To explore non-noble metal electrocatalysts with high performance is still a challenge. Herein, a one-step electrodeposition way is developed to construct the heterostructural (NiO-La 2 O 3 )/(Ni-La)/NiO/Ni electrocatalysts on Ni foam. The dark Ni-La coating was prepared by co-electrodeposition from an aqueous solution containing LaCl 3 and NiCl 2 with a molar concentration ratio of 1:5. Among these heterostructural Ni-based electrocatalysts, an excellent HER activity is achieved: an overpotential of 22 mV at the current density of 10 mA cm −2 in 1 M KOH solution. It is demonstrated that the introduction of La significantly reduces the overpotential for HER. The higher the La content in the Ni-La coating of these electrocatalysts, the better the electrocatalytic HER performance was exhibited. This work provides a facile and inexpensive route to prepare Ni-La coating on electrodes in an aqueous solution.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jie Liu,Chunmiao Liu,Yanchun Tong,Haibin Sun,Hui Peng,Mingwei Zhang,Shigang Wu,Hongying Zhang,Hongyu Gong,Zhiqin Zheng,Xue Guo,Yurun Feng
The SiCN/Fe/Ni ceramics codoped with iron acetylacetonate (FA) and nickle acetylacetonate (NA) was synthesized by polymer-derived ceramics (PDCs) method in this study. The microstructure, phase composition and electromagnetic wave (EMW) absorption properties of the samples were analyzed. The polarization loss and conduction loss of materials were analyzed by the direct current (DC) multimeter and the contribution rate of polarization loss was more than 94% in the whole frequency band. The results showed that C, SiC, Fe 2 Si, Ni 3 Si, γ- (Fe, Ni) and CNTs were formed after pyrolysis which provided lots of heterogeneous interface and enhanced the interfacial polarization. Meanwhile, Ni could enter the lattice of Fe and formed a unique electronic configuration, which reinforced the conductivity and stability of Fe. In addition, the in-situ generated Fe 2 Si and Ni 3 Si provided magnetic loss and conduction loss. The RL min value of SiCN/Fe/Ni-3 ceramic was −52.06 dB at 1.54 mm and the effective absorption band (EAB, RL ≤ −10 dB) reached 4.21 GHz (13.79–18 GHz, 1.43 mm).
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Ning Gu,Yueyang Xu,Yan Yin,Xuzhao Gao,Yongping Zeng
SO x released from the combustion of sulfur-containing compounds in fuels pollute the environment and have a serious impact on human health. Adsorption desulfurization is an effective and environmentally friendly technique for removing sulfur-containing compounds from fuels. Metal-organic frameworks (MOFs) have high specific surface areas and can be easily modified and functionalized, making them excellent candidates for adsorption desulfurization in fuels. In this work, the precursor MIL-100(Fe)-SA was prepared using the hydrothermal method , and the adsorbent Ni@MIL-100(Fe)-SA was obtained by doping Ni 2+ into the resulting MIL-100(Fe)-SA using the impregnation method. FT-IR, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption-desorption isotherms were used to analyze the samples. The results indicated that Ni 2+ was successfully loaded onto MIL-100(Fe)-SA, and the MOF's structure remained stable. The adsorption performance of benzothiophene and thiophene was evaluated through batch adsorption experiments. The adsorption capacities of Ni@MIL-100(Fe)-SA for thiophene and benzothiophene were 23.68 mg S/g and 49.58 mg S/g, respectively. These observations could be ascribed to the π-complexation interactions between Ni 2+ of the framework and thiophenic compounds. The regeneration experiments demonstrated that the spent 11Ni@MIL-100(Fe)-SA-1.5 reach 86% of the adsorption capacity of fresh adsorbent after four cycles. Additionally, the regenerated adsorbent maintained good crystallinity after recycling.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Cheng Cheng,Jiangtao Xu,Wei Gao,Shouxiang Jiang,Ronghui Guo
Metal-organic frameworks (MOFs) show promise and potential in energy storage but have limited applications due to their poor conductivity. In this work, a flexible fabric electrode is constructed with a sphere-flake-sphere structure formed by a nick-metal-framework (Ni-MOF) and reduced graphene oxide (RGO). The sphere-flake-sphere structure improves the conductivity and enhances the electrochemical performance of flexible RGO/Ni-MOF/metallic fabric electrodes (RNMEs). The areal capacitance of the RNME samples can reach 260 mF/cm 2 at a current density of 4 mA/cm 2 . The areal capacitance of RNME samples shows a good cycle stability after undergoing 2000 charging/discharging cycles. The all-solid-state asymmetric fabric supercapacitor (AAFSC) based on this hybrid and PPy fabric electrode shows excellent electrochemical energy-storage performance, with an areal capacitance of 95 mF/cm 2 , a power density of 3.07 mW/cm 2 , and an energy density of 7.72 μWh/cm 2 . The areal capacitance of AAFSC can keep over 70% of original areal capacitance after 1500 charging/discharging cycles. This flexible AAFSC shows a promise and potential for wearable textile electronics.
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高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Jinyue Yang,Jianxin Wang,Yongwen Lin,Xin Huang,Guangming Yin,Haixia Yu,Wendi Wang,Xinyou Zhang,Hong Pan
Transition metal sulfides are considered potential electrode materials for supercapacitors because of their low electronegativity, high electrochemical activity, and rich oxidation–reduction properties , but they also have the disadvantages of poor cycle stability and low magnification performance. In-situ growth sulfides on the current collector can strengthen the structural stability of the electrode to a certain extent, but this method only obtains a weak binding of the sulfide and current collector. With the progress of cycling, repeated structural evolution will inevitably lead to metal dissolution and sulfide shedding. In this study, nickel-poor reactants were cleverly adopted to synthesize one in-situ sulfide on nickel foam (NF) by activating the nickel element in NF to participate in the formation of sulfide, so as to obtain the in-situ electrode material with flower shape and gradient Ni content, named as Ni (2-x) CoS 4 /Ni 2 CoS 4 /Ni electrode. By further compounding polyaniline (PANI) on the surface of Ni (2-x) CoS 4 /Ni 2 CoS 4 /Ni electrode, the in-situ gradient Ni (2-x) CoS 4 /Ni 2 CoS 4 /Ni-PANI composite electrode (ISG-NCS-PANI) was obtained. This in-situ bimetallic sulfide has not only high stability, but also high reactivity. The flower shape with a large specific surface area is also beneficial to enhance the rate performance. As a result, the specific capacitance of the composite electrode is up to 2909.4 F g −1 at 1 A g −1 . After 5000 cycles, the capacity remains 83.8 %. The asymmetric supercapacitor (ASC) composed of activated carbon (AC) negative electrode has a specific capacitance of 211.11 F g −1 at 1 A g −1 . The power density of 749.99 W kg −1 shows the maximum energy density of 65.97 Wh kg −1 . The above results prove that ISG-NCS-PANI electrode holds significant potential for application prospect in the domain of energy storage and conversion.
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高影响因子
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