Nano Research
·
2015
·Vol. 8
·期 12
·3815-3822
·
IF 7.01
Wang Lingxiao,Geng Jing,Wang Wenhai,Yuan Chao,Kuai Long,Geng Baoyou
The sluggish oxygen evolution reaction (OER) is an important half-reaction of the electrochemical water-splitting reaction. Amorphous Fe/Ni composite oxides have high activity. In this work, we modified the aerosol spray-assisted approach and obtained amorphous Fe-Ni-O
x
solid-solution nanoparticles (Fe-Ni-O
x
-NPs) approximately 20 nm in size by choosing iron/nickel acetylacetonates as raw materials instead of inorganic salts. The small-sized Fe-Ni-O
x
-NPs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis, energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). Furthermore, an investigation of electrochemical OER performance suggests that the small-sized Fe-Ni-O
x
-NPs have higher activity than the large-sized Fe-Ni-O
x
-MPs. A small overpotential of 0.315 V was demanded to obtain a working current density of 50 mA/cm 2 , and the Tafel slope was as low as 38 mV/dec.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Changyan Guo,Cheng Guo,Shuai Yang,Naeem Akram,Yonghong Zhang,Jide Wang
Controlling the excessive oxidation of 1,4-Benzenedimethanol (1,4-BDM) to selectively produce high-value-added 4-hydroxybenzaldehyde (4-HB) under mild conditions while simultaneously generating H 2 is a challenging problem. In this study, it was found that incorporating Ni into cadmium sulfide (CdS) significantly reduces the bandgap of CdS and adjusts its conduction band position, yet still leads to over-oxidation of 1,4-BDM. To enhance selectivity, we designed and synthesized a bifunctional photocatalyst, CdS-Ti/Ni, with a petal-like structure by integrating both Ni and Ti with CdS. This composite exhibits a bandgap of 2.3 eV, and the synergistic effects of Ti and Ni result in more favorable valence and conduction band positions, thereby demonstrating superior photocatalytic efficiency and selectivity. Within the first 30 minutes, the bifunctional CdS-Ti/Ni achieved a 73 % selectivity for 4-HB. The H 2 evolution rate reached 20.2 mmol·g −1 ·h −1 , which is 13 times higher than that of pure CdS. This study demonstrates that bimetal doping can adjust the energy band structure, photocatalytic H 2 production efficiency and oxidation selectivity of semiconductor materials, offering valuable insights for the design of efficient bifunctional photocatalysts.
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CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 35
·期 4
·405-409
·
IF 1.852
Xiandong Dou,Weijun Liu,Qing Liu,Zhiqiang Niu
An electrocatalyst of nickel phosphide (Ni 2 P) nanorod arrays vertically grown on Ni foam composite (NNFC) was prepared successfully using NaH 2 PO 2 as phosphorus source by means of a facile method of in situ phosphorization of Ni foam. The as-prepared NNFC exhibits excellent HER performance with an onset overpotential of 100 mV, a small Tafel slope of only 55 mV/dec, and a low overpotential involving 200 mV at a current density of 10 mA•cm −2 . Furthermore, the electrocatalyst was also demonstrated to possess high stability with a neglectable decrease in activity even after durability test for 25 h.
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ACS Catalysis
·
2017
·
IF 10.614
Sai Chen,Liang Zeng,Hao Tian,Xinyu Li,Jinlong Gong
Partially oxidizing methane into syngas via a two-step chemical looping scheme is a promising option for methane transformation. Providing the optimum lattice oxygen to selectively produce syngas represents the major challenge for the development of oxygen carrier materials in chemical looping processes. This paper describes the design of WO3-based oxygen carriers as the primary source of lattice oxygen with high melting points and attractive syngas selectivity. To further enhance the lattice oxygen availability and methane conversion capacity, NiO nanoclusters are introduced, considering the doping effect on chemical bonding disruption in both bulk and surface regions. For Ni0.5WOx/Al2O3, the nickel cations incorporated into the bulk of WO3 can strongly weaken the tungsten–oxygen bond strength and increase the availability of lattice oxygen. The surface-grafted nickel species can effectively activate methane molecules and catalyze the partial oxidation reaction. Total methane conversion and syngas yield can be substantially increased by about 2.7-fold in comparison with unmodified WO3/Al2O3. This work demonstrates that the bulk and surface modifications are feasible to tailor the active lattice oxygen of oxygen-carrying materials in chemical looping processes.
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FUEL
·
2017
·
IF 4.601
Chuang Li,Guangyue Xu,Yongxiang Zhai,Xiaohao Liu,Yanfu Ma,Ying Zhang
Gamma-valerolactone (GVL) has been identified as a sustainable high-value platform molecular for the production of fuels and carbon-based chemicals. In this work, a series of activated carbon supported low-cost bimetallic Ni-Fe catalysts (Ni-Fe/AC) with different molar content of Fe species were prepared by using co-precipitation method for the liquid phase hydrogenation of ethyl levulinate (EL) to produce γ-valerolactone. The Ni-Fe 0.5 /AC exhibited the highest activity among the bimetallic or monometallic catalysts under mild reaction conditions (100 °C, 4 MPa H 2 , 6 h) and achieved 99.3% conversion of EL and 99.0% yield of GVL. Under more mild conditions (60 °C, 2 MPa H 2 ) and prolonging the reaction time to 24 h, EL could be converted completely and the obtained GVL yield was more than 98%. The catalysts were characterized by various techniques including XRD, TEM, HRTEM, EDX, XPS, H 2 -TPR and NH 3 -TPD. Based on the structure and activity relationship study, the formation of highly dispersed Ni-Fe alloy structure and the co-presented FeO x nanoparticles could be responsible for the high catalytic hydrogenation activity.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Lianghao Li,Zhuangpeng Huang,Xiaoxiao Fan,Zhen Zhang,Rongni Dou,Shulong Wen,Yuan Chen,Yuancai Chen,Yongyou Hu
An optimized metal oxide electrode (Ti/SnO 2 -Sb-Pd) was prepared via thermal decomposition and used in the electrochemical degradation of Ni-EDTA. The electrode was characterized by SEM, XRD, XPS, and electrochemical characterizations including linear-sweep voltammetry (LSV), cyclic voltammetry (CV) and chronopotentiometry (CP) techniques. It was found that Pd doping could effectively change the surface morphology and lattice parameters of the metal oxide electrode. Pd can facilitate the entry of more Sb into SnO 2 crystals and promote the reduction of Sb from the +5 to the +3 state. The interaction of these metals raised the oxygen evolution potential (OEP) and electrochemical surface area of the electrode, in addition to reducing the degradation potential and increasing the degradation current of Ni-EDTA. When the molar ratio of Pd:Sn was 2.5%, the electrode could simultaneously degrade 87.5% of Ni-EDTA and recycle 17.9% of elemental Ni on the cathode within 120 min. At the same time, with Pd doping, the lifetime of the electrode was increased more than 40 times, demonstrating good potential for application in industry.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Yanghe Fu,Long Sun,Huan Yang,Lai Xu,Fumin Zhang,Weidong Zhu
The Ni-doped NH 2 -MIL-125(Ti) catalyst was developed for the photocatalytic aerobic oxidation of aromatic alcohols upon visible light irradiation. The results show that different aromatic alcohols can be effectively transformed to their corresponding aldehydes with almost absolute selectivity using O 2 as the oxidant over Ni-doped NH 2 -MIL-125(Ti) upon visible light irradiation. Compared with the parent catalyst NH 2 -MIL-125(Ti), Ni-doped NH 2 -MIL-125(Ti) exhibits a significantly enhanced photocatalytic activity for the selective oxidation of aromatic alcohols. Preliminary studies indicate that the doping of Ni nanoparticles into NH 2 -MIL-125(Ti) could improve the visible-light harvesting, charge-separation, and electron-transport of the resultant catalyst, leading to the enhanced photocatalytic activity. The current work provides some guidance in the development of MOF-based photocatalysts for organic syntheses.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Min-Qiang Wang,Yan Zhang,Shu-Juan Bao,Ya-Nan Yu,Cui Ye
Recently metal-organic frameworks (MOFs) have attracted more attention in developing new electrochemical sensors due to their unique properties such as crystalline ordered structures, tunable pore sizes, large surface areas, chemical tenability and thermal stability. However, the direct application of single component MOFs in electrochemistry is limited owing to their poor electronic conductivity and inferior electrocatalytic ability. Herein, Ni(II)-Based metal-organic framework (Ni(II)-MOFs) was successfully anchored on carbon nanotubes (CNTs) by in situ solvothermal method for the first time. In the as-prepared composites, 2∼3 nm MOFs nanoparticles homogeneously dispersed on conducting CNTs allowed for the MOFs nanoparticles to be wired up to a current collector through the underlying conducting CNTs. As the electrode materials of an non-enzymatic H 2 O 2 biosensor, the Ni(II)-MOFs/CNTs exhibited excellent electrocatalytic performance including a wide linear detection range from 0.01 to 51.6 mmol L −1 , low detection limit of 2.1 μmol L −1 and very fast response of 2.5 s for H 2 O 2 sensing. Most importantly, the stability and conductivity of Ni(II)-based MOFs is far higher than that of pure MOFs.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 19
·9233-9240
·
IF 8.867
Jun Jiang,Han Gao,Shu Lu,Xing Zhang,Chu-Ya Wang,Wei-Kang Wang,Han-Qing Yu
Fabrication of non-Pt high-performance oxygen reduction reaction (ORR) catalysts is essential for the application of fuel cells. In this work, monodisperse bimetallic Ni–Pd core–shell nanoparticles (NPs) with tunable shell compositions and contents were synthesized by using a modified one-pot colloidal approach and characterized. Also, the core shell structure dependence of their ORR performance without the interruption of an intermetallic phase was explored. The core–shell structured catalysts (Ni@Pd3/C NPs) exhibited a robust ORR activity and stability with a high onset potential of 0.99 V, a half-wave potential of 0.87 V and an average electron transfer number of 3.91 in 0.1 M HClO4. Furthermore, a high onset potential of 0.98 V, a half-wave potential of 0.86 V and an average electron transfer number of 3.98 were achieved in 0.1 M KOH. These results are comparable to those of the commercially available Pt/C catalysts. Moreover, the catalysts also maintained a good long-term cycling stability in both acidic and alkaline electrolytes. Thus, this work demonstrates that the ORR performance of the Ni–Pd alloy could be boosted through constructing the core–shell structure with a Pd-enriched surface and the Ni–Pd model alloy could be further applied to assess the role of the Pd-based core–shell structure in other electrochemical catalytic reactions.
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Journal of the Iranian Chemical Society
·
2016
·Vol. 14
·期 1
·111-119
·
IF 1.3
Yang Xiaomei,Fu Xiaomin,Bu Ningning,Han Li,Wang Jianfeng,Song Chengying,Su Yunlai,Zhou Lipeng,Lu Tianliang
Cu–Ni/γ-Al 2 O 3 bimetallic catalysts were developed for anaerobic dehydrogenation of non-activated primary aliphatic alcohols to aldehydes. Systematic investigation about the promotion effect of nickel on the catalytic performance was carried out. Hydrogenation of C=C bond rather than C=O bond, was significantly improved over Cu–Ni/γ-Al 2 O 3 catalyst by introducing nickel, which interprets the good conversion of primary aliphatic alcohols. This work would contribute to design new catalysts for dehydrogenation of primary aliphatic alcohols.
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ADVANCED POWDER TECHNOLOGY
·
2014
·
IF 1.642
Hongtao Cui,Junyin Xue,Minmin Wang
α-Ni(OH) 2 nanosheets were prepared at room temperature on ultra large scale through a solvent-free reaction. The nanosheets were obtained by grinding the mixture of nickel nitrate hexahydrate and morpholine in a mortar for 5 min. The maximum capacity of production in single batch was only limited by volume of the vessels used in preparation. The as-prepared nanosheets exhibited the highest specific capacitance of 2080.8 F g −1 at discharge current density of 0.6 A g −1 in a 6 mol l −1 KOH aqueous solution. The nanosheets also presented other high electrochemical performances such as nearly 100% coulombic efficiency, excellent rate capacity and high stability. These results indicated that the α-Ni(OH) 2 nanosheets can be used as a high performance electrochemical material for application in supercapacitor .
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2014
·Vol. 44
·期 11
·1165-1170
·
IF 2.147
Pu Zonghua,Liu Qian,Asiri Abdullah M.,Sun Xuping
In this communication, we demonstrate the preparation of Ni nanoparticles-graphene hybrid film via simultaneous electrochemical reduction of graphene oxide and Ni 2+ on conductive substrate for the first time. We further show the utilization of such hybrid film as an efficient oxygen evolution reaction electrocatalyst with highly catalytic activity and good durability.
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