JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Ying Gao,Yihui Wu,Hanwei He,Wenyu Tan
Development of cost-effective and efficient earth-abundant catalysts for hydrogen evolution reaction (HER) is a great challenge. In this study, by one-step potentiostatic electrodeposition, the Ni–Se–Cu electrocatalyst on nickel foam was fabricated as a binder-free HER electrocatalyst. As compared with Ni–Se electrocatalysts, such fabricated Ni–Se–Cu electrocatalyst exhibited prominent electrocatalytic activity to the HER in alkaline electrolyte. This Ni–Se–Cu electrocatalyst exhibits a small overpotential of 136 mV to achieve a current density of 10 mA·cm −2 and high electrochemical stability. The remarkable HER properties of Ni–Se–Cu electrocatalyst mainly originate from high electronic conductivity induced by Cu-doping. This work shows a cheap and simple avenue to develop high efficient non-noble electrochemical electrocatalysts for HER.
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PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 63
·14496-14501
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IF 4.857
You Xu,Xingjie Chai,Mengying Liu,Tianlun Ren,Shanshan Yu,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
Graphical Bifunctional electrocatalysts : Two-dimensional NiIr@N-doped carbon nanocomposites supported on Ni foam substrate function as bifunctional electrocatalysts for overall water splitting in alkaline conditions. Electrochemical water splitting can provide a promising avenue for sustainable hydrogen production. Highly efficient electrocatalysts toward the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are extremely important for the practical application of water splitting technology. Herein, a one-step annealing strategy is reported for the fabrication of a metal–organic framework-derived bifunctional self-supported electrocatalyst, which is composed of two-dimensional N-doped carbon-wrapped Ir-doped Ni nanoparticle composites supported on Ni foam (NiIr@N-C/NF). The resultant NiIr@N-C/NF displays excellent electrocatalytic performance in 1.0 m KOH, with low overpotentials of 32 mV at 10 mA cm −2 for the HER and 329 mV at 50 mA cm −2 for the OER. Particularly, the HER-OER bifunctional NiIr@N-C/NF needs only 1.50 V to yield 10 mA cm −2 for overall water splitting.
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高影响因子
FUEL
·
2020
·
IF 5.578
Chufei Lv,Leilei Xu,Mindong Chen,Yan Cui,Xueying Wen,Cai-e Wu,Bo Yang,Fagen Wang,Zhichao Miao,Xun Hu,Qinghui Shou
In this work, we reported that the fibrous silica nanosphere, also called as KCC-1, was facilely synthesized by the improved microemulsion hydrothermal fabrication strategy. The obtained KCC-1 was investigated as the support of the Ni based catalysts toward CO 2 methanation. The obtained catalysts with unique dendrimeric mesopore structure and outstanding structural properties could provide easily accessible as well as highly dispersed Ni nanoparticles to the gaseous reactants. Besides, the Ni based catalysts with commercial SiO 2 and MCM-41 as supports were also prepared as the reference catalysts to demonstrate the advantages of the dendrimeric mesoporous channels. Various techniques, such as X-ray powder diffraction (XRD), N 2 physisorption, transmission electron microscopy (TEM), H 2 temperature programmed reduction (H 2 -TPR), CO 2 temperature programmed desorption (CO 2 -TPD), X-ray photoelectron spectroscopy (XPS), etc., were used to characterize the catalytic supports and corresponding catalysts. It was found that the metallic Ni nanoparticles could be highly dispersed over the catalysts supported on fibrous KCC-1 with dendrimeric mesoporous channels. Furthermore, the catalytic performances toward CO 2 methanation had been further evaluated over these catalysts at different temperatures. It was found that the KCC-1 supported catalyst performed much higher low-temperature catalytic activities than the reference catalysts supported on commercial SiO 2 and MCM-41, suggesting that the fibrous and dendrimeric mesoporous channels displayed distinctive advantages by accommodating enough metallic Ni active sites. The kinetic study also revealed that the topology of the mesoporous channel could obviously influence the apparent activation energy in the CO 2 methanation reaction. Besides, the temperature programmed surface reaction (TPSR) and in-situ Diffused Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) of the CO 2 methanation were also carried out to reveal the possible reaction pathway and mechanism. We also found that the fibrous silica nanosphere (KCC-1) supported catalyst demonstrated much better sintering-proof property of the metallic Ni nanoparticles than the reference catalysts during the 40 h stability tests at 400 °C. Therefore, the present fibrous silica nanosphere (KCC-1) could be considered as the promising support for Ni based catalysts toward CO 2 methanation.
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高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
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2020
·Vol. 50
·期 11
·1091-1099
·
IF 2.384
Fa Dejuan,Miao Yuqing
Abstract The NiHPO 4 –Ni(OH) 2 nanowire-assembled bouquets were easily synthesized. Scanning electron microscopy and transmission electron microscopy show the NiHPO 4 –Ni(OH) 2 bouquets form through the organization of nanowires which arrange with certain direction. The electrocatalytic activities of NiHPO 4 –Ni(OH) 2 –GCE towards the oxidation of methanol and urea were studied in NaOH. The nanowire-assembled bouquets were modified on the surface of the glassy carbon electrode, leading to the increase on the surface area of the electrode, which in turn enhanced the current density and electrocatalytic performance for the oxidation of methanol and urea. It shows the potential applications for the utilization of these energy molecules. Graphic abstract
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高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 9
·4878-4883
·
IF 5.503
Hongjie Yu,Ziqiang Wang,Zechuan Dai,Qiqi Mao,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Porous metal catalysts are considered as excellent catalysts for water electrolysis because of their large surface area, tunable pore size, abundant active sites and facilitated charge/mass transfer channels. Herein, a Au3Pt alloy film with interconnected network pores was in situ grown on Ni foam (pAu3Pt/NF) by a micelle-assisted replacement route. Benefiting from the interwoven network porous structure and bimetallic component, pAu3Pt/NF exhibits remarkable electrocatalytic HER activity that delivers an overpotential of −40.1 mV at a current density of 50 mA cm−2 with a Tafel slope of 42.3 mV dec−1 in 1.0 M KOH electrolyte. The proposed strategy paves the way to the rational design of self-supporting interwoven network porous nanomaterials for high-efficiency water electrolysis and beyond.
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高影响因子
POWDER TECHNOLOGY
·
2019
·
IF 3.413
Zhi-Bo Li,Guo-Hua Zhang,Kuo-Chih Chou
The ultrafine composite powders of two different compositions (90W-7Ni-3Fe and 93W-4.9Ni-2.1Fe, wt%) were synthesized by a two-stage reduction process consisting of carbothermic pre-reduction and the following deep reduction by hydrogen, and then the densification behaviors of them were investigated. The prepared W-Ni-Fe composite powders by the new proposed two-stage method had the particle size ranged from 200 nm to 400 nm. The sintered compacts of these two kinds of W-Ni-Fe powders achieved nearly full densification at a sintering temperature of 1400 °C within 3 h. The maximum hardness of the alloys obtained at 1300 °C were 411 HV and 358 HV, and the bending strength of >1500 MPa was achieved at 1400 °C for the compositions of 90W-7Ni-3Fe and 93W-4.9Ni-2.1Fe, respectively. Meanwhile, the bending fracture mechanism was also investigated, which was different for the samples sintered at different temperatures.
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高影响因子
Catalysts
·
2019
·Vol. 9
·期 11
·952
·
IF 3.444
Huiyuan Xue,Jingjing Xu,Xingxing Gong,Rongrong Hu
The in-situ hydrodeoxygenation of bio-derived phenol is an attractive routine for upgrading bio-oils. Herein, an active trimetallic Ni-Cu-Co/Al2O3catalyst was prepared and applied in the in-situ hydrodeoxygenation of bio-derived phenol. Comparison with the monometallic Ni/Al2O3catalyst and the bimetallic Ni-Co/Al2O3and Ni-Cu/Al2O3catalysts, the Ni-Cu-Co/Al2O3catalyst exhibited the highest catalytic activity because of the formation of Ni-Cu-Co alloy on the catalyst characterized by using X-ray powder diffraction (XRD), temperature programmed reduction (TPR), N2physisorption, scanning electron microscope (SEM), and transmission electron microscope (TEM). The phenol conversion of 100% and the cyclohexane yield of 98.3% could be achieved in the in-situ hydrodeoxygenation of phenol at 240 °C and 4 MPa N2for 6 h. The synergistic effects of Ni with Cu and Co of the trimetallic Ni-Cu-Co/Al2O3catalyst played a significant role in the in-situ hydrodeoxygenation process of phenol, which not only had a positive effect on the production of hydrogen but also owned an excellent hydrogenolysis activity to accelerate the conversion of cyclohexanol to cyclohexane. Furthermore, the catalyst also exhibited excellent recyclability and good potential for the upgrading of bio-oils.Keywords:bio-derived phenol;Ni-Cu-Co/Al2O3;in-situ hydrodeoxygenation;cyclohexane;hydrogenolysis
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Enyang Liu,Xiaoli Yin,Jinhui Hu,Sirong Yu,Yan Zhao,Wei Xiong
Many attentions have been attracted to prepare superhydrophobic coatings on the metal surfaces for their prominent properties, especially the self-cleaning and anti-corrosion properties. In this work, a facile electrodeposition method was applied to fabricate hierarchical Cu-Ni coating on the 316 L stainless steel , and the followed myristic acid modification was used to lower the surface energy. The water droplet would remain spherical on this coating, and measured water contact angle and sliding angle were 161.27° and 7.8°, respectively. The contaminants on the coating surface could be easily carried away by the closed water droplets. In addition, the coating could effectively hinder the deposition of salt solution. Besides, the coating could endure long-term acid solution immersion and natural placement. Moreover, it was verified that this superhydrophobic Cu-Ni coating formed a robust barrier to block the transmission of chlorine ions , thus corrosion damage to steel surface could be effectively relieved. This superhydrophobic Cu-Ni coating provides a novel strategy and promising applications for preventing various metal surfaces from being contaminated and corroded.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Junxia Guo,Jinhe Shu,Jun Nie,Guiping Ma
In this work, oxygen reduction reaction (ORR) electrocatalysts Fe/Ni bimetal and nitrogen co-doped porous carbon fibers (Fe x /Ni y -NPCF), derived from electrospun nanofiber , have been prepared. In order to optimize the ORR performance of one dimension (1D) catalysts, SiO 2 were used as template to create the hierarchical porous structure. The morphology of Fe x /Ni y -NPCF was investigated by scanning electron microscope (SEM) and transmission electron microscope (TEM). By adjusting the ratio of iron and nickel, the influence of the trace of secondary-metal doping in electrocatalyst on catalytic activity was deeply studied. The electrochemical measurements suggested that the trace of secondary-metal doping was good for increasing the half-wave potential of electrocatalyst. The optimized Fe 28 /Ni 2 -NPCF exhibited an excellent catalytic activity with an onset potential of 0.96 V and a half-wave potential of 0.88 V, which are comparable to that of the benchmark 20 wt% Pt/C. This excellent catalytic performance was derived from secondary-metal doping and abundant pore structure .
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Changhui Zhu,Haiyong Wang,Hu Li,Bijuan Cai,Wei Lv,Chiliu Cai,Chenguang Wang,Long Yan,Qiying Liu,Longlong Ma
Alloyed Cu−Ni encapsulated in carbon was prepared by loading Ni and Cu onto biochar (BC) through an initial wetness impregnation method under mild conditions. The bimetallic catalysts were exploited to perform selective hydrodeoxygenation (HDO) of 5-hydroxymethylfurfural (HMF). 2,5-Dimethylfurfural (DMF), a promising liquid fuel/fuel additive, could be obtained from HMF with the highest yield of 93.5% under the optimized conditions. During HMF HDO, two key intermediates, 5-methylfurfural (MFF) and 2,5-dihydroxymethylfuran (DHMF), dominating two distinct conversion pathways were systematically investigated by Arrhenius kinetics analysis. In addition, the turnover frequencies (TOFs) of HDO reaction over Cu−Ni/BC corresponding with Cu amount were thoroughly discussed, finding that the electron transfer from Cu to Ni in the alloy structure was beneficial to the HDO reaction and the conversion pathways can be regulated by reaction temperature variation. Importantly, the synergy of HDO of HMF by alloyed Cu−Ni metal and Lewis acid sites from oxide NiOx were hence clarified by systematic catalyst characterizations. The Cu−Ni/BC catalyst is stable for at least five consecutive runs to obtain the stabilized 81.9% of DMF since the third run.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Bogu Liu,Bao Zhang,Ying Wu,Wei Lv,Shixue Zhou
Transition metals, including Ni, show good catalytic activity in the hydrogen storage reaction of Mg. In the present paper, first-principles calculation is performed to predict and analyze the hydriding reaction of Ni-incorporated Mg and experimental study is used to verify the accuracy of the forecast. Theoretical studies show that the hydriding reaction of Ni-incorporated Mg is a diffusion-controlled process. With Ni incorporation, the energy barrier of H 2 dissociation is significantly decreased and the diffusion becomes the limiting step. Experimental studies confirm the results of theoretical studies. Besides, the material with Ni incorporation shows excellent activation performance and rapid absorption rates, leading to a high hydrogen content of 4.1 wt% in 60 s under 240 °C 3.0 MPa H 2 and a low activation energy of 56.1 kJ mol −1 versus 0.4 wt% and 73.5 kJ mol −1 for the material without Ni incorporation. Atomic Ni only plays a role of catalyst.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22672-22685
·
IF 3.925
Jing Wang,Mei Zhang,Feng Li,Huan Wang,Yanguang Chen,Hua Song
To deeply understand the role of P in hydrodeoxygenation (HDO), SiO2-supported Ni and Ni–P catalysts with different P/Ni ratios (x) were prepared. The as-prepared samples were characterized by various characterization methods. The HDO activity and product distribution over the Ni/SiO2 and N–P/SiO2-x were compared and the effects of x on the structure, acidity, formation mechanism of active phases and HDO performance were studied taking m-cresol HDO as a model reaction. The results showed that the introduction of P promotes the formation of smaller active sites and contributes to the creation of weak and medium strength acid sites through the formation of P–OH groups and Niδ+ in Ni2P. HDO over the Ni/SiO2 catalyst occurs mainly via the hydrogenation (HYD) route with 3-methyl-cyclohexanol (3-MCHnol) as the main product. However, for Ni–P/SiO2-x catalysts, methyl-cyclohexane (MCH) selectivity increases first and then decreases with the increase of x, reaching a maximum of 95% at x = 1. The acidity generated by the introduction of P contributes to increased MCH selectivity, while the dehydration of 3-MCHnol to MCH occurs mainly on acid sites. However, the excessively high P content (x ≥ 2.0) leads to a significant increase of MB (toluene) selectivity, which is associated with the increase in Ni(I) sites. About 100% m-cresol conversion was achieved with Ni–P/SiO2-1.0 when the m-cresol (g)/catalyst (g) ratio was 3, with MCH (99.4%) as the major product, showing great promise for deep HDO catalysis.
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高影响因子
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