JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yu Wang,Yijun Jiang,Yangyang Yuan,Li Xu,Wanting Sun,Si Wu,Qingmiao Wang,Ning Hu,Li Wang
In this study, Ni was severed as a promoter and impregnated on hydroxyapatite (HAP) to prepare a Ni-doped HAP support, and then Ru was highly dispersed onto the Ni-HAP through urea precipitation method. The synergistic effects between Ru and Ni caused a reduction in the particle size of Ru nanoparticles and an increased Ru 4+ /Ru 0 ratios, which was primarily attributed to the strong interaction between the active components and functional groups of OH - and PO 4 3- . Meanwhile, Ru/Ni-HAP possessed the highest amount of medium-strength acid sites and relatively low reduction temperatures, indicating the critical balance between acidity and redox capability. Ru/Ni-HAP exhibited superior activity with complete conversion of toluene at 280 °C and DCM at 400 °C, respectively, and such high activity can be maintained throughout the stability tests. Besides, optimal catalytic performance was observed under 600 ppm concentrations of toluene and DCM with a space velocity of 40,000 ml(g·h) −1 . These findings can provide valuable insights for the development of chlorine-resistant catalysts with promising application prospects.
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Journal of Energy Storage
·
2024
·
IF 8.9
Honglong Qu,Tiantian Cao,Qiaolin Li,Gang Chen,Hongtao Guan,Chengjun Dong
Reasonably tuning the structure of Ni 2 P based complex electrode is decisive to boost its applications in supercapacitor. Herein, we demonstrate the design and preparation of NiMoO 4 @Ni 2 P nanosheet arrays with unique core–shell architecture on Ni foam (NF) for pseudocapacitor. The directly grown Ni–MOF on NF was used to couple with NiMoO 4 via an ion exchange between BDC 2− and MoO 4 2- , which is crucial to form a stable NiMoO 4 @Ni 2 P/NF core–shell structure during the subsequent phosphatization. The NiMoO 4 @Ni 2 P/NF electrode can deliver a high capacitance of 3655.1 mF cm −2 at 1 mA cm −2 with a remarkable cycling stability (95.35 % over 4000 cycles). Additionally, the assembled NiMoO 4 @Ni 2 P/NF–2//AC/NF device achieves a stable working voltage of 1.7 V and delivers a superior energy density of 0.155 m Wh cm −2 at a power density of 1.705 mW cm −2 . The outstanding performance of pseudocapacitor is mainly ascribed to the stable diffusion channel, rich reactive species and hetero–interface, enabling fast electrochemical reaction kinetics.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
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IF 8.3
Shiyuan Wang,Peiya Li,Shuhan Lu,Bo Wang,Qinchuan Shi,Jiahui Wang,Fusheng Yang,Bin Wang,Tao Fang
Developing both high-performance and cost-effective hydrogenation catalysts is of strategic importance for advancing the industrialization of liquid organic hydrogen carrier (LOHC) technology. Herein, a series of Ni-based catalysts supported on Ni/Al mixed metal oxides (Ni/NiAl-MMO) are prepared by in-situ topotactic transformation of NiAl-LDH precursors. The synergistic enhancement mechanism, which is regulated by the Ni–Al interfacial interactions and the anchoring effect of precursors, is systematically investigated with respect to the influence on the size and electronic structure of active metal nanoparticles, as well as on the catalytic performance in N-ethylcarbazole (NEC) hydrogenation. The results show that the optimized Ni/Ni 1 Al 2 -MMO-500 catalyst achieved both small size and high electron density of active metal particles. The synergistic size and electronic enhancement endow the catalyst with superior catalytic activity in NEC hydrogenation, exceeding all reported Ni-based catalysts and exhibiting catalytic efficiency comparable to that of the widely used commercial precious metal hydrogenation catalyst, 5 wt% Ru/Al 2 O 3 , with high catalytic performance sustained across five NEC hydrogenation cycles.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Linghui Peng,Haiyu Wang,Guiying Li,Weiping Zhang,Zhishu Liang,Taicheng An
Most commercial air purifiers rely on dense fibrous filters for bioaerosols control, which filter the particulate matter size-dependently without bactericidal activity. Herein, the non-size-dependent bifunctional nickel foam filters (g-C 3 N 4 /TiO 2 (CT)/Ni-polydopamine(PDA)/Ni bifunctional filter) with two layers of coupling nickel foams deposited by CT and PDA, respectively, were developed. The bifunctional filter shows remarkable non-size dependent bacteria removal efficiency (93.5 %) and inactivation efficiency (∼70 %) within 20 min at high airflow (12.5 L min −1 ). The inactivation efficiency can be further increased to 99.99 % with prolong irradiation time and enhancement of light intensity. The non-size dependent capture effect of the CT/Ni-PDA/Ni provided by adhesive force and charge was verified. In addition, the assumption that reactive oxygen species (ROSs) could be transferred into air during bacteria inactivation was first proved by chemiluminescent. This pioneered study may provide new insights into the development of bifunctional filters for non-size dependent capture and photocatalytic inactivation of bacteria in bioaerosols .
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APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Fajie Hu,Rushuo Li,Danfeng Zhao,Xiubing Huang,Ge Wang
The hydrogenation of dicyclopentadiene (DCPD) to synthesize tetrahydrodicyclopentadiene (THDCPD) is one of the key processes for the preparation of high-energy–density fuels, and the development of low-temperature and high-activity Ni catalysts is still challenging. In this work, hierarchical porous (HP) Ce-UiO-66 loaded Ni nanoparticles (NPs) catalysts were prepared based on the soft template method and liquid-phase in situ reduction method. The introduction of mesopores into Ce-UiO-66 can effectively enhance the transfer and adsorption of the substrate, and Ni NPs act as the main active centers. Furthermore, the modulation of the electronic structure of Ni NPs and the promotion of Ce-Ni interaction were effectively achieved by changing the in-situ deposition conditions. With a low loading of 3 wt% Ni NPs, the prepared 3Ni/HP-UiO-66 catalysts could achieve the observed complete DCPD conversion and 100 % selectivity of THDCPD within 1 h and retained good cycling stability. The results demonstrated preferential adsorption and hydrogenation of the norbornene ring, confirming the reaction pathway of the 3Ni/HP-UiO-66 catalyst for the hydrogenation of DCPD. The present work provides a guidance for exploring and designing non-noble metal catalysts for the hydrogenation of olefins and aromatics.
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DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
Tian-Li Meng,Jia-Wei Wang,Ying-Xia Ma,Xin-Quan Chen,Lei Lei,Jing Li,Fen Ran
Layered double hydroxide (LDH), as an electrode material, consists of positively charged layers and interlayer hydrated anions and is endowed with promising prospects in supercapacitors (SCs) due to its large specific surface area, tunable metal ions, abundant redox active sites, and low cost. Moreover, metal-organic frameworks (MOFs) exhibit adjustable pore sizes, while multi-walled carbon nanotubes (MWCNTs) boast exceptional electrical conductivity. Hence, in this work, flower-like nickel/manganese layered double hydroxide (Ni/Mn-LDH) was introduced into nanohybrid of MWCNTs decorated with nickel metal-organic frameworks (Ni-MOFs/MWCNTs) to fabricate a novel Ni-MOFs/MWCNTs@Ni/Mn-LDH nanohybrid as electrode material for SCs using a two-step solvothermal method. In the composite structure of the novel Ni-MOFs/MWCNTs@Ni/Mn-LDH nanohybrid, the flower-like assembly of Ni/Mn-LDH nanosheets was seamlessly integrated with MWCNTs adorning the Ni-MOFs, creating an interconnected hierarchical porous network. This distinctive structure, coupled with the synergistic effects of its components, facilitated the swift diffusion of electrolyte ions. Furthermore, it enhanced the accessibility to more active sites at the interfaces during the redox process, thereby contributing considerably to an improved electrochemical performance. The specific capacity of the Ni-MOFs/MWCNTs@Ni/Mn-LDH nanohybrid as electrode material obtained at the optimal experimental conditions was 1151.0C g −1 at 1.0 A g −1 . The assembled asymmetric supercapacitor (ASC) had an energy density of 25.6 Wh kg −1 at a power density of 845.3 W kg −1 . The fabrication strategy of the Ni-MOFs/MWCNTs@Ni/Mn-LDH could be extended to synthesize other nanohybrid.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 42
·20490-20496
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IF 3.925
Ling Li,Jing Wu,Lieyuan Huang,Gaoli Lan,Naxiang Wang,Hui Zhang,Xin Chen,Xingbo Ge
Commercial applications of electrolytic water splitting require cost-efficient and active oxygen evolution catalysts. Nickel–iron (NiFe)-based compounds have attracted significant attention as oxygen evolution reaction (OER) catalysts due to their high catalytic activity. We develop a simple and easily controlled method by combining anodic fluoridation and cyclic voltammetry (CV) treatment to convert NiFe alloy to Ni/Fe hydroxide. A cracked layer structure of Ni/Fe hydroxide formed on the surface during the fluoridation of NiFe alloy and the CV process in KOH. The Ni/Fe hydroxide exhibits considerable OER activity with an onset potential of 1.47 V vs. RHE and a Tafel slope of 47 mV dec−1 in 0.1 M KOH. The electrode also shows an acceptable stability in alkaline media. The results indicate that anodic fluoridation and CV treatment are promising methods to form active layer structures of hydroxide on transition metals and their alloys, further increasing the electrocatalytic activity of the catalyst.
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Catalysis Science & Technology
·
2020
·Vol. 11
·期 1
·297-311
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IF 5.721
Xiaoqiang Zhang,Peifang Yan,Bin Zhao,Z. Conrad Zhang
The electronic and structural differences of anatase TiO2 (TiO2-A) and rutile TiO2 (TiO2-R) supported Ni catalysts are studied to understand the distinctively different catalytic pathways in guaiacol hydrodeoxygenation over Ni/TiO2-A and Ni/TiO2-R catalysts. Temperature programmed reduction profiles of NiO/TiO2-A and NiO/TiO2-R reveal two types of metal–support interactions. NiO on TiO2-R requires much higher temperature to reduce than NiO on TiO2-A by hydrogen reduction. Surface TiO2-A is partially reduced together with NiO at low temperature driven by strong interaction between reduced Ni and the reducible TiO2-A surface. In situ X-ray photoelectron spectroscopy (XPS), high resolution TEM (HRTEM), and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy of adsorbed CO reveal two types of reduced Ni species on Ni/TiO2-A: Ni0 particles and atomically dispersed electron-rich Niδ− atoms. While Ni0 particles are formed only at high Ni loadings, they are fully encapsulated by an overlayer of partially reduced TiOx, making the surface of Ni particles totally inaccessible to CO and to reactants. The electron-rich Niδ− atoms are favorably formed at all Ni loadings on the TiO2-A surface and show only linearly adsorbed CO in the DRIFT spectra. Electron transfer from Ti and O on the TiO2-A surface to atomically dispersed Ni is indicated by the observation of dominant electron-rich Niδ− species in conjunction with Ti(4+δ)+ and O(2−δ)− on Ni/TiO2-A following H2 reduction. In contrast, the chemical states of metallic Ni0 and Ti4+ remain unchanged on Ni/TiO2-R after H2 reduction. The atomically dispersed Niδ− species, formed only on the Ni/TiO2-A surface, is proposed as the active site responsible for the selective hydrodeoxygenation of guaiacol to phenolics. In contrast, the metallic Ni0 particles formed on the Ni/TiO2-R surface catalyze the typical catalytic hydrogenation, preferentially saturating the aromatic ring.
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Molecular Catalysis
·
2026
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IF 4.9
Hui-Li Wu,Jia-Wei Liu,Chang-Long Tan,Zi-Rong Tang
Selective photocatalytic dehydrogenation of saturated N-heterocycles represents a sustainable photoredox route for synthesizing valuable nitrogen-containing unsaturated heteroaromatic organics. Herein, we report a Ni-decorated 3D sea urchin-like CdS composite (Ni/CdS) as a dual-functional photocatalyst for the efficient and selective semi-dehydrogenation of 1,2,3,4-tetrahydroisoquinoline (THIQ) to 3,4-dihydroisoquinoline (DHIQ) coupled with H 2 evolution under visible light irradiation. The surface-decorated Ni nanoparticles significantly enhance the separation and transfer of photogenerated electron–hole pairs over Ni/CdS, and act as reactive sites for proton reduction to H 2 , thereby leading to the improved dual-functional photoredox catalysis. Mechanistic studies identify the carbon-centered radical (•CH(NH)C 8 H 8 ) as a pivotal intermediate in the photocatalytic semi-dehydrogenation of THIQ. This study establishes an effective strategy for designing noble-metal-free photocatalytic systems that integrate selective organic transformations with H 2 evolution in a cooperative manner.
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JOURNAL OF POWER SOURCES
·
2014
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IF 5.211
Lu Wang,Mingtao Li,Zhiyu Huang,Yingming Li,Suitao Qi,Chunhai Yi,Bolun Yang
A nanocluster Ni–WC/C electrocatalyst is prepared through a sequential impregnation method and is used for the urea electrooxidation in alkaline conditions. The micro-morphology, lattice parameter , composition and surface states of Ni–WC/C particles are determined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) and X-ray photoelectron spectrometry (XPS) analysis. The electrooxidation activity and stability of the Ni–WC/C catalyst are also investigated by cyclic voltammograms and chronoamperograms. Characterization results indicate that the Ni nanoclusters are uniformly distributed on the WC/C framework, and the Ni–WC/C catalyst shows high electrocatalytic activity and stability for urea electrooxidation. The maximum current density at the Ni–WC/C electrode is almost 700 mA cm −2 mg −1 which is one order of magnitude higher than that at the Ni/C electrode, and the steady current density at the Ni–WC/C electrode is also markedly improved. Furthermore, the ESA values and XPS spectra indicate that the enhanced performance of the Ni–WC/C catalyst could be attributed to the structure effect and electron effect between nickel and tungsten carbide .
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ACS Applied Nano Materials
·
2026
·
IF 5.8
Xinpu Yang,Zhanwen Wang,Siqi Chen,Yuan He,Gang Wang,Xiping Yang,Mingxia Lu
A Ni(OH)2/reduced graphene oxide (rGO) nanocomposite with a well-defined hexagonal nanosheet morphology was synthesized via a one-step hydrothermal approach using graphene oxide (GO) and nickel sulfate hexahydrate (NiSO4·6H2O) as precursors. Crucially, a commercial-level high mass loading of 8 mg·cm–2 was successfully achieved on the electrode. Structural analysis confirmed that the incorporation of rGO effectively prevents the agglomeration of Ni(OH)2 nanosheets, while forming an interconnected three-dimensional (3D) conductive network. This unique structure enhances the overall electrical conductivity and facilitates rapid ion diffusion even under heavy mass loading conditions. Electrochemical characterization in a three-electrode system revealed that the composite synthesized with a GO concentration of 1 mg·mL–1 (NG-1) exhibited remarkable rate capability across current density ranging from 0.5 to 5 A·g–1. At a current density of 0.5 A·g–1, it delivered a superior specific capacity of 369.5 C·g–1. When assembled into an asymmetric supercapacitor with activated carbon (AC), the hybrid device delivered a specific capacitance of 101.6 F·g–1 (174.4 C·g–1) at 0.5 A·g–1. More remarkably, it demonstrated exceptional cycling stability with 102.2% initial capacitance retention after 10,000 charge–discharge cycles at 2 A·g–1, confirming the excellent electrochemical stability of the NG-1 electrode. Notably, the assembled device attained an energy density of 36.12 Wh·kg–1 at a power density of 400 W·kg–1, significantly surpassing conventional electrochemical double-layer capacitors. The Ni(OH)2/rGO nanocomposites developed in this work combine facile synthesis with outstanding electrochemical properties, providing a promising material solution for high-power energy storage applications.
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FUEL
·
2020
·
IF 5.578
Run-Ping Ye,Lin Liao,Tomas Ramirez Reina,Jiaxu Liu,Durgaiah Chevella,Yonggang Jin,Maohong Fan,Jian Liu
The CO 2 methanation is an important process in coal-to-gas, power-to-gas and CO 2 removal for spacecraft. Recently, metal-organic framework (MOF) derivatives have been demonstrated as high-performance catalysts for CO 2 upgrading processes. However, due to the high costs and low stability of MOF derivatives, it still remains challenge for the development of alternative synthesis methods avoiding MOF precursors. In this work, we present the sol-gel method for loading Ni-MOF to silica support in two-steps. Upon modifying the procedure, a more simplified one-step sol-gel method has been developed. Furthermore, the obtained Ni/SiO 2 catalyst still exhibits great catalytic performance with a CO 2 conversion of 77.2% and considerable CH 4 selectivity of ~100% during a stability test for 52 h under a low temperature of 310 °C and high GHSV of 20,000 mL·g −1 ·h −1 . Therefore, this work provides a ground-breaking direct strategy for loading MOF derived catalysts, and might shed a light on the preparation of highly dispersed Ni/SiO 2 catalyst.
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