IONICS
·
2024
·Vol. 30
·期 4
·2287-2298
·
IF 2.4
Lin Jie,Ding Yihong,Jin Huile,Zeng Tianbiao
The development of inexpensive, highly effective and durable electrocatalysts for hydrogen production via water electrolysis is of paramount importance. Transition metal oxides, owing to their simplicity in preparation and cost-effectiveness, have been widely investigated, particularly cobalt, nickel, and manganese oxides. Inspired by the synergies of the ternary cathode materials of lithium-ion batteries (LiNi x Mn y Co 1- x - y O 2 , NMC), a simple and feasible method was used to prepare a graphite plate as the support, and Ni and Mn were co-doped with Co 3 O 4 as an efficient water decomposition catalyst. Experimental studies indicated that the 10% Ni and 10% Mn co-doped Co 3 O 4 (Co 2.4 Ni 0.3 Mn 0.3 O 4 , CNM-811) exhibited the lowest overpotential in the oxygen evolution reaction (OER), with CNM-811 achieving an overpotential of 338 mV at 30 mA cm −2 in NaOH aqueous solution, the Tafel slope is 79.71 mV dec −1 . In the hydrogen evolution reaction (HER), an overpotential of 190 mV was attained at 10 mA cm −2 . In overall water splitting, a cell voltage of 2.048 V was achieved at 100 mA cm −2 , which was superior to many analogous catalysts reported today.
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Nano Research
·
2024
·Vol. 17
·期 6
·4815-4824
·
IF 9.5
You Xingchao,Xu Jiawei,Zhuang Zechao,Xia Junkai,Wang Suwen,Wei Haiyan,Li Yongfu,Cai Yanjiang,Xiang Hai,Yu Bing
Developing electrocatalysts that exhibit both high activity and ammonia selectivity for nitrate reduction is a significant and demanding challenge, primarily due to the complex nature of the multiple-electron reduction process involved. An encouraging approach involves coupling highly active precious metals with transition metals to enhance catalytic performance through synergy. Here, we report a ruthenium-nickel alloy catalyst with nanosheets (Ru-Ni NSs) structure that achieves a remarkable ammonia Faradaic efficiency of approximately 95.93%, alongside a yield rate of up to 6.11 g·h −1 ·cm −2 . Moreover, the prepared Ru-Ni NSs exhibit exceptional stability during continuous nitrate reduction in a flow reactor for 100 h, maintaining a Faradaic efficiency of approximately 90% and an ammonia yield of 37.4 mg·L −1 ·h −1 using 0.05 M nitrate alkaline electrolyte. Mechanistic studies reveal that the catalytic process follows a two-step pathway, in which HONO serves as a migration intermediate. The presence of a partially oxidized Ru (002) surface enhances the adsorption of nitrate and facilitates the release of the migration intermediate by adjusting the strength of the electrostatic and covalent interactions between the adsorbate and the surface, respectively. On the other hand, the Ni (111) surface promotes the utilization of the migration intermediate and requires less energy for NH 3 desorption. This tandem process contributes to a high catalytic activity of Ru-Ni NSs towards nitrate reduction.
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Chinese Journal of Mechanical Engineering
·
2025
·
IF 4.5
Daosen Song,Guangming Zhang,Mingli Ai,Peikai Duan,Chuanlong Liu,Quan Xu,Dandan Qu,Hongbo Lan
Ceramic/metal functional gradient materials (FGMs) are used in a wide range of applications in energy, machinery, aerospace and other fields due to the advantages of both ceramic and metal materials. However, conventional laser additive manufacturing faces significant challenges, such as consequential residual thermal stresses due to the large physical differences between ceramics and metals, which lead to warpage deformation and interlayer cracking of the material. Therefore, this paper introduces a new strategy to prepare ZrO 2 /Ni FGMs based on shrinkage-matched materials extrusion 3D printing. Firstly, the consistency of shrinkage of ZrO 2 and Ni was achieved with a minor volumetric shrinkage different of 0.6% by adjusting the solid content of the slurry and the sintering temperature. Then, the microstructure and mechanical properties of FGMs with different numbers of gradient layers (2, 3, 5) and thicknesses (100 µm, 150 µm, 200 µm) were investigated, demonstrating a gradual elemental and mechanical gradient. Through the analysis of fracture cracks and fracture surface morphology, the fracture process and mechanisms of the samples were elucidated. Finally, several typical structures FGMs were prepared from pure metal to pure ceramic in both XY and Z directional gradient. Overall, it addresses the challenges associated with fabricating deformation-free ceramic/metal FGMs and developing strong bonds between ceramics and metals.
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2025
·
IF 3.4
Wei Wang,Ming Yin,Qichao Wu
Nickel-based coatings are known for their exceptional properties and high microhardness, making them widely used to enhance the surface performance of metal components. In order to investigate the effect of pulse current densities ( I D ) on the performance and structure of the coatings, the Ni/W–TiN coatings were prefabricated on a 45 steel substrate by using a pulse electrodeposition (PED) approach. The study examines how varying pulse current densities ( I D ) impact the coatings' microstructure, microhardness, phase composition, and wear/corrosion resistance. Among the coatings tested, the one deposited at an I D value equal to 0.5 A/dm 2 revealed the best structure, with average sizes of 66.4 nm for Ni–W grains and 39.3 nm for TiN nanoparticles. XRD patterns revealed characteristic peaks at 43.8°, 50.5°, and 74.2°, corresponding to the (1 1 1), (2 0 0), and (2 2 0) planar directions of Ni–W. The value of pulse I D significantly influenced the microhardness value of the coatings. The sample deposited at 0.1 A/dm 2 showed a microhardness of approximately 675.4 HV, while the coating formed at 0.5 A/dm 2 showed the highest microhardness at around 834.9 HV. Moreover, Ni/W–TiN coating deposited at 0.5 A/dm 2 showed the lowest corrosion value equal to 0.71 A/cm 2 .
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ACS Nano
·
2025
·
IF 16
Kang Lian,Sanshuang Gao,Wenxian Liu,Qian Liu,Yanhong Feng,Jun Luo,Guangzhi Hu,Ke Chu,Dingsheng Wang,Xijun Liu
The combination of CO2 fixation and small organic molecule oxidation offers a promising solution to increasing severe environmental issues and energy crises. Here, low-coordinated NiN3 sites were anchored onto nitrogen-doped ordered mesoporous carbon (Ni-SAs/NOMC), which is capable of efficiently catalyzing the coupled methanol oxidation reaction and CO2 reduction reaction (MOR||CO2RR), thereby reducing the energy required for CO2 conversion and enhancing the economic value of the CO2 electrolytic system. In the membrane electrode assembly electrolyzer-based MOR||CO2RR, Ni-SAs/NOMC achieved Faradaic efficiencies (FEs) of 95.4% for formate at the anode and 96.3% for CO at the cathode. Moreover, at a current density of 0.8 A cm–2, Ni-SAs/NOMC demonstrated stable electrolysis for up to 100 h, with FEs at both the anode and cathode remaining stable at approximately 90%. In situ spectroscopy analyses and theoretical calculations identified the formation of critical intermediate species and the origin of activity improvement, guiding the development of efficient electrosynthesis of valuable chemicals.
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高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Zhenwen Yang,Ziyi Shui,Mengfei Zhao,Zheng Wei,Fenglian Zhang,Xiaoxiao Duan,Ben Niu,Bingzhi Li,Guoxia Jiang,Zhengping Hao
Catalytic NH3 decomposition has drawn growing interest in constructing the NH3-based hydrogen economy. Ni catalysts show great potential in this reaction but suffer from low atom utilization efficiency and unclear structure–activity relationship. Here, atomic layer deposition was used to grow Ni clusters on CeO2 nanorods to create a highly active catalyst for NH3 decomposition, which outperforms the conventional Ni nanoparticle catalysts and the synthesized Ni single-atom catalyst. The distinct catalytic behaviors of Ni clusters and Ni single atoms were systematically investigated. It is revealed that the interfacial confinement effect induces a strong electronic interaction between Ni clusters and CeO2, wherein abundant Ov-Ce3+ sites are formed in the vicinity of Ni clusters, resulting in interfacial electron-enriched Niδ− sites. These Niδ− sites bind to N adatoms moderately, favoring N–H bond cleavage and nitrogen desorption (the rate-determining step), which is the origin of the high activity. In contrast, ionic Ni single atoms diffusing into the CeO2 lattice display a much lower activity since strongly bound N adatoms block the active sites and retard the overall rate. This work provides a deep understanding of Ni-catalyzed NH3 decomposition and paves the way for designing high-performance metal catalysts for other structure-sensitive reactions.
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Molecular Catalysis
·
2025
·
IF 4.9
Xirui Yan,Haixia Liang,Ruicong Wang,Da Li,Jun Li,Wencai Peng,Jinli Zhang
CO 2 reforming with methane (DRM) is a potential effective carbon neutralization strategy to convert greenhouse gases into syngas. The key to the DRM process is to design active and coking resistant catalysts. Herein, hollow hierarchical bimetallic NiMo-HMgO catalysts were prepared via hydrothermal-impregnation method. The prepared NiMo-HMgO catalysts exhibited higher catalytic performance during the DRM process than commercial NiMo-CMgO catalysts, due to the formation of Ni-Mo-MgO composite on hierarchical MgO (HMgO), which is promoted by exposed (111) polar surface of HMgO with alternate arrangement of anion and cation layers. The deposited carbon and stability can be effectively regulated by adjusting the amount of Ni and the molar ratio of Mo/(Ni+Mo). The synergistic effect of metal and HMgO can provide reference for the research in other related fields.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 8
·4893-4902
·
IF 10.7
Zhao Sun,Yunhan Gong,Dongfang Cheng,Zhiqiang Sun
Catalytic methane decomposition shows the prominent superiority of generating hydrogen in one step with almost no carbon oxide production; however, it suffers from catalyst deactivation and low by-product carbon quality. Herein, a series of H2-reduced NixCr2Ox+3 (abbreviated as reduced NixCr2) catalysts were designed and synthesised for highly efficient methane decomposition and carbon nanotube production. A maximum methane conversion of 87.1% and hydrogen concentration of 91.8 vol% were achieved at 750 °C without deactivation. The results from XPS, XAS, and Raman reveal that the reduced NixCr2 catalysts have significant activity and stability. On the one hand, they form the Cr–O–Ni structure, thus possessing strong Ni–Cr2O3 interaction. On the other hand, the lattice oxygen of the reduced NixCr2 catalysts induces methane activation, thus accelerating methane activation, as demonstrated by the generation of a little amount of CO. In addition, the relationship between the types of carbon deposited and Ni/Cr ratio, decomposition temperature, and time was also revealed to guide carbon nanotube synthesis. Density functional theory calculation confirms the lowest dehydrogenation barrier of Ni(111)/Cr2O3(012), demonstrating the superiority of the Cr–O–Ni catalyzed methane decomposition. These findings provide innovative ideas for the construction of functionalized materials, which will substantially promote the development of methane decomposition.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Zhao Rongxiang,Wang Hongli,Li Xiuping
The introduction of oxygen vacancies on the surface of catalysts is an important way to improve the performance of catalysis for oxidative desulfurization. In this study, Ni-doped CoMoO 4 catalysts with a significant number of oxygen vacancies were synthesized using hydrothermal methods. The structure of the catalysts was characterized through scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption–desorption techniques, and UV–visible diffuse reflectance (UV–Vis DRS). Compared to CoMoO 4 , the specific surface area of Ni-CoMoO 4 decreased, but the performance of catalysis is improved due to the increased number of oxygen vacancies. The oxidative desulfurization experiments showed that catalytic activity was significantly enhanced by Ni doping. The optimum reaction conditions were determined to be a Ni/Co molar ratio of 1:20, a reaction temperature of 110 °C, a catalyst dose of 0.05 g, and an oxygen flow rate of 150 mL/min. The desulfurization rate of dibenzothiophene (DBT) in model oil could be as high as 96% under the optimum reaction conditions. The desulfurization mechanism of the catalyst was investigated by free radical-trapped experiments. This study proposes a novel strategy for oxidative desulfurization using metal-doped compounds with abundant oxygen vacancies as catalysts. Graphical abstract An inorganic material Ni-CoMoO 4 with a number of oxygen vacancies was synthesized by hydrothermal method and applied for removal of sulfur-containing compounds. It is necessary for ecological and environmental demands. This work provides a new idea for oxidative desulfurization using metal-doping compound containing a number of oxygen vacancies as catalysts.
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RARE METALS
·
2025
·
IF 11
You Lv,Qiang Yang,Jixing Zhu,Dongyue Zhao,Junyuan Fan,Valery Konstantinovich Sheleg,Xin Qiu
en Mg−Ni−Y alloy is considered to be one of the most promising hydrogen storage materials, but its high dehydrogenation energy barrier hinders its practical application. A dual-stage heat treatment (490°C × 4 h + 550°C × 4 h) is applied to optimize the microstructure and hydrogen storage performance of a vacuum-melted Mg 94 Ni 3 Y 3 alloy. This process induces a two-level phase transformation of the long-period stacking ordered (LPSO) structure (18R + 14H→14H→18R), facilitating Ni/Y atom pre-distribution via stacking fault recombination at 490°C and promoting a eutectic-like reaction at 550°C. As a result, a large-scale eutectic-like structure composed of finely dispersed and uniformly interwoven Mg 2 Ni and LPSO phases is formed, characterized by a high density of phase boundaries. The optimization of the microstructure directly leads to the enhancement of hydrogen storage performance, as evidenced by a reduction in dehydrogenation activation energy from 139.7 to 113.5 kJ mol −1 and a decrease in enthalpy change from 85.8 to 71.7 kJ mol −1 . This work demonstrates a convenient microstructure regulation strategy, which is expected to advance Mg−Ni−Y alloys toward industrial applications. 摘要 zh Mg−Ni−Y 合金因其优异的储氢潜力而备受关注,但较高的脱氢能垒仍制约其工程化应用。针对真空熔炼的Mg 94 Ni 3 Y 3 合金,本研究采用双阶段热处理工艺(490°C×4 h+550°C×4 h)调控其显微组织与储氢性能。结果表明,该工艺诱导长周期堆垛有序(LPSO)结构经历两级相变过程(18R+14H→14H→18R):在490°C通过层错重组实现Ni/Y原子的预分布,在550°C进一步促进类共晶反应的发生。由此形成的大尺度类共晶组织由细小弥散且均匀交织的Mg 2 Ni相与 LPSO 相构成,具有高密度相界特征。显微组织的显著优化有效降低了脱氢活化能(由139.7降至113.5 kJ mol −1 )和焓变(由85.8降至71.7 kJ mol −1 ),从而提升了储氢动力学性能。本工作提出了一种简便高效的组织调控策略,为Mg−Ni−Y合金的工程化应用提供了新思路。
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ACS Nano
·
2025
·
IF 16
Feng Li,Xin Zhang,Kaixin Zhang,Maosheng Gong,Zezhou Lin,Peiyu Hou,Jingyuan Liu,Haijing Liu,Hongzhou Zhang,Xijin Xu,Haitao Huang
The synergistic effects of a single-crystal structure and high-entropy doping are expected to enhance the structural and thermal stability of high-capacity Ni-rich cathodes. Nonetheless, the pinning effect caused by heavy-mass dopants and surface phase segregation induced by the thermodynamic immiscibility of dissimilar elements hinder atomic diffusion and crystal fusion, making it extremely difficult to synthesize single crystals with high-entropy doping. In this study, density functional theory calculations confirm that effective diffusion is achievable within a grain-boundary-free single-crystal matrix at elevated temperatures, even for heavy-mass dopants with high valence states. A lattice-matched epitaxial growth approach is proposed to enable the synthesis of single-crystal Ni-rich oxides with high-entropy doping. The synergistic effects of high-entropy doping and single crystals within a Ni-rich cathode exhibit significantly reduced changes in the lattice volume and Ni–O/TM coordination distance and the absence of intragranular cracks upon Li+ de/intercalation, presenting highly improved cyclic and thermal stabilities compared with the high-entropy-doped polycrystal counterpart and single-crystal counterpart without high-entropy doping. This integration not only addresses the inherent limitations of Ni-rich compositions but can also be expanded to the design of other electrode materials, where entropy-driven stabilization and single crystals can work together to enhance cathode performance.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Changtu Ma,Bing Dai,Yanxia Wu,Ying Liu,Lin Jing,Caili Zhang,Huayun Du
In-situ grown graphene nanosheets reinforced nickel-based composites (graphene/Ni composites) always suffer from the trade-off between strength and ductility due to the poor mechanical compatibility and interfacial bonding of reinforcement/matrix components. Microalloying has been established to be an effective strategy in strengthening the graphene/Ni composites; however, the influences of alloying elements on the microstructures and mechanical properties of the composite still remain unclear. This study introduces the Cu element into the Ni matrix for achieving a co-reinforcing effect with the well-dispersed in-situ graphene nanosheets. The experimental investigations and first-principles calculation reveal that a proper concentration of Cu dopant not only improves the bonding strength of the graphene/Ni interface by a good wettability, but also causes an abnormal grain growth in the Ni matrix and thus generates a bimodal structure. Consequently, the in-situ synthesized graphene/Ni composite with 1.5 wt.% Cu exhibits the optimal strength-ductility synergy with a high yield strength, ultimate tensile strength, and fracture elongation of 276 MPa, 575 MPa, and 49.9%, respectively. Compared to the undoped composite, the enhancements in these mechanical parameters reach 32.1%, 21.6%, and 28.9%, respectively. Despite the common strengthening mechanisms, such as the effective load transfer, dislocation strengthening, twin boundary strengthening, solid-solution strengthening, and Orwan strengthening, are contribute to the tensile strength of Cu microalloying graphene/Ni composites, it is determined that the hetero-deformation-induced hardening is playing a critical role. At the same time, the bimodal structure also delays the necking and further suppresses the crack propagation in the Ni matrix, enabling exceptional plasticity.
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