Nanoscience and Nanotechnology Letters
·
2017
·Vol. 9
·期 6
·867-872
·
IF 1.889
Du Jingjing,Song Ya,Feng Yahui,Li Na,Tan Haihu,Li Changyun,Xu Lijian
Hierarchically nanoporous Ti–SiO2 particles were synthesized by dissolving template method, and the hierarchically nanoporous Au@Ti–SiO2 particles were further prepared by in-situ synthesis method using NaBH4 as reducing agent. The
components of the hierarchically nanoporous Au@Ti–SiO2 particles and Ni–W–Co alloy electrode were investigated by energy dispersive spectrometer (EDS). In addition, the hierarchically nanoporous Au@Ti–SiO2/Ni–W–Co composite electrode
was fabricated by the method of composite electrodeposition using hierarchically nanoporous Au@Ti–SiO2 particles as composite nanoparticles. Finally, the electrocatalytic activities for hydrogen evolution of different electrodes were investigated. Results showed that, the
mass fractions of Ni, W and Co were 62.78%, 11.75% and 25.47% respectively in the coating of Ni–W–Co alloy electrode. The mass fractions of Au and Ti were 0.94% and 4.21% respectively in the hierarchically nanoporous Au@Ti–SiO2 particles which indicated that the
Au nanoparticles were successfully doped into the hierarchically nanoporous Ti–SiO2 particles. And the results of electrocatalytic activity study showed that, Co and W have good electrocatalytic activity for hydrogen evolution, which can greatly improve the electrocatalytic
activity for hydrogen evolution. The electrocatalytic activity of Ni–W–Co alloy electrode was superior than that of Ni electrode and Ni-Walloy electrode. The electrocatalytic activity for hydrogen evolution of hierarchically nanoporous Au@Ti–SiO2/Ni–W–Co
composite electrode was improved because of adding Au@Ti–SiO2 and reached the optimal value when the concentration of nanoporous Au@Ti–SiO2 particles was 1.6 g/L.
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高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 4
·1861-1870
·
IF 10.182
Yiwei Tang,Mo Qiu,Jirui Yang,Feng Shen,Xiaoqi Wang,Xinhua Qi
Ni-Doped ordered mesoporous carbon (Ni@OMC) was prepared by a one-pot solvent evaporation-induced self-assembly (EISA) process with sustainable biomass-derived gallic acid as the carbon precursor, F127 as the soft template and Ni2+ as the cross-linker and catalytically active ingredient. Ni particles with ca. 7.8 nm diameter were uniformly dispersed in the carbon skeleton of the synthesized OMC due to the confinement effects of Ni particles in the carbon skeleton of OMC by coordination between gallic acid molecules and metal Ni2+ ions in the EISA process. The as-synthesized Ni@OMC sample showed excellent catalytic performance for the hydrogenation of biomass-derived furfural into furfuryl alcohol (FFA), and a FFA yield as high as 98% could be achieved at 180 °C in 4 h reaction time in 1-propanol solvent in the presence of 3 MPa H2 pressure. The prepared Ni@OMC exhibited good stability and recyclability. This work provides a green and simple one-pot strategy for the synthesis of metal-doped OMCs without using harmful phenolic and formaldehyde compounds, which should have many applications in fields such as catalysis, drug delivery and energy storage.
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高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 21
·7200-7216
·
IF 6.119
Hairus Abdullah,Hardy Shuwanto,Dong-Hau Kuo
A Ni–Mg bimetal-doped Zn(O,S) photocatalyst has been synthesized, characterized, and tested for several photocatalytic applications. The hydrogen generation reaction, hydrogenation reaction for chemical transformation, detoxification of hexavalent chromium, and mixed dye (MB + RhB + MO) degradation under simulated solar-light illumination were confirmed. The essential characterization results indicated improved oxygen vacancy sites on the catalyst with enhanced photoresponse, better photocarrier separation, and facile charge transfer properties. A typical catalyst, NMZ-S10, was evaluated with a 1000-cycle CV test to demonstrate its long-term use for industrial application. Stable reusability experiments for the HER, PHR, PHC reaction, and PDM also supported the long-term application. The photocatalytic HER of NMZ-S10 could evolve hydrogen at a rate of 4000 μmol g−1 h−1. 30 ppm azobenzene-to-aniline conversion was completely done in 2 h of reaction. Detoxification of 30 ppm hexavalent chromium was conducted in 70 min of reaction. Finally, 10.5 ppm MB–RhB–MO mixed dye degradation was carried out in 1 h of reaction. The as-synthesized NMZ-S10 catalyst has demonstrated its capability to overcome energy and environmental issues promisingly. The great photocatalytic activities are discussed and elucidated with a plausible mechanism to rationalize the superb catalytic performance.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 10
·1505-1513
·
IF 4.803
Abuduwayiti Reyila,Ma Feng-Yun,Fan Xing
Four supported catalysts, nickel and ruthenium on a HZSM-5 support, were prepared by equal volume impregnation and in-situ decomposition of carbonyl nickel. The properties of catalysts were investigated by catalytic hydro-conversion of 2,2′-dinaphthyl ether as the model compound and extraction residue of Naomaohu lignite as the sample under an initial H 2 pressure of 5 MPa and temperature at 150 °C. According to the catalytic hydro-conversion results of the model compound, Ni—Ru/HZSM-5 exhibited the best catalytic performance. It not only activated H 2 into H⋯H, but also further heterolytically split H⋯H into immobile H − attached on the acidic centers of Ni—Ru/HZSM-5 and relatively mobile H + . Catalytic hydro-conversion of the extraction residue from Naomaohu lignite was further examined over the optimized catalyst, Ni—Ru/HZSM-5. Detailed molecular compositions of products from the extraction residue with and without hydrogenation were characterized by Fourier transform infrared spectroscopy and gas chromatography/mass spectrometry. The analytical results showed that the oxygen-containing functional groups in products of hydrogenated extraction residue were obviously reduced after the catalytic treatment. The relative content of oxygenates in the product with catalytic treatment was 18.57% lower than that in the product without catalytic treatment.
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高影响因子
Protection of Metals and Physical Chemistry of Surfaces
·
2017
·Vol. 53
·期 1
·118-126
·
IF 0.707
Fashu S.,Khan R.
Ternary Zn–Mn–Ni alloy coatings were electrodeposited for the first time from a choline chloride based ionic liquid with the aim of collecting properties of binary Zn–Mn and Zn–Ni alloys into one alloy system. The effect of electrodeposition potential on the composition and corrosion performance of the obtained ternary Zn–Mn–Ni deposits was investigated and contrasted with the characteristics of Zn–Mn and Zn–Ni deposits. Cyclic voltammetry revealed that the deposition of ternary Zn–Mn–Ni alloys behaved differently from the deposition of binary Zn–Mn and Zn–Sn alloys and that Mn deposition takes place at positive potentials in the Zn–Mn–Ni electrolyte than in the Zn–Mn electrolyte due to the presence of Ni 2+ ions in the electrolyte. X-ray diffraction studies showed that the Zn–Mn–Ni ternary alloys consist of a lattice of Zn (with Mn and Ni imbedded inside) at low electrodeposition potentials and MnZn(with Ni imbedded inside) phase at high electrodeposition potentials. Chemical composition analysis show that the Mn content in the ternary Zn–Mn–Ni alloy increased with increase in electrodeposition potential, whereas Zn and Ni contents are suppressed. The corrosion tests results indicate that through addition of Ni into the Zn–Mn binary alloy, the Zn–Mn–Ni alloy tailored are more corrosion resistant than the Zn–Mn binary alloy whilst the passivation behavior is still preserved.
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高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 3
·1-12
·
IF 6.048
Gao Yuchen,Jiang Jianguo,Meng Yuan,Ju Tongyao,Han Siyu
Biogas is a renewable biomass energy source mainly composed of CH 4 and CO 2 . Dry reforming is a promising technology for the high-value utilization of biogas. Some impurity gases in biogas can not be completely removed after pretreatment, which may affect the performance of dry reforming. In this study, the influence of typical impurities H 2 S and NH 3 on dry reforming was studied using Ni/MgO catalyst. The results showed that low concentration of H 2 S in biogas could cause serious deactivation of catalyst. Characterization results including EDS, XPS and TOF-SIMS confirmed the adsorption of sulfur on the catalyst surface, which was the cause of catalyst poisoning. We used air calcination method to regenerate the sulfur-poisoned catalysts and found that the regeneration temperature higher than 500 °C could help catalyst recover the original activity. NH 3 in the concentration range of 50–10000 ppm showed a slight inhibitory effect on biogas dry reforming. The decline rate of biogas conversion efficiency increased with the increase of NH 3 concentration. This was related to the reduction of oxygen activity on catalyst surface caused by NH 3 . The synergetic effect of H 2 S and NH 3 in biogas was investigated. The results showed that biogas conversion decreased faster under the coexistence of H 2 S and NH 3 than under the effect of H 2 S alone, so as the surface oxygen activity of catalyst. Air calcination regeneration could also recover the activity of the deactivated catalyst under the synergetic effect of H 2 S and NH 3 .
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高影响因子
CORROSION
·
2022
·Vol. 78
·期 12
·1166-1175
·
IF 2.094
Wang Changxuan,Zhang Wenjiao,Wang Yanli
In this paper, in order to improve the corrosion resistance of 316 stainless steel (316 SS) in molten chloride salt, an in situ grown Al 2 O 3 diffusion barrier is prepared through, first, electrodepositing an inner Ni-Al/NiO composite transition layer and an outer Ni layer through double-pulse composite electroplating technique, followed by annealing at 800°C for 12 h under Ar. The obtained Al 2 O 3 /Ni composite coating is dense and shows good adherence to the substrate. Then the corrosion resistance of Al 2 O 3 /Ni composite coating in molten 52MgCl 2 -48NaCl (wt%) is measured through electrochemical technique and immersion tests and the corrosion mechanism is also discussed. The results show that the 316 SS is effectively protected by the Al 2 O 3 /Ni composite coating from the corrosion of molten chloride salt.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Shiyou Xing,Pengmei Lv,Che Zhao,Ming Li,Lingmei Yang,Zhongming Wang,Yong Chen,Shijun Liu
Non-H 2 and solvent-free catalytic conversion of waste lipids to liquid hydrocarbons is of great interest because of the associated low-cost, full-safety, and easy-operability. In this work, a solvent-free catalytic process for deoxygenating oleic acid was performed in H 2 and non-H 2 (N 2 , CH 4 , and CO 2 ) media over nano-Ni/HZSM-5. 8-Heptadecene, a primary product obtained at 320 °C in four media, was derived from the straightforward decarboxylation of oleic acid. In non-H 2 medium at 360 °C, the formation of C 8 –C 15 alkanes was enhanced, with yields of ca. 65.05 mol%, 70.71 mol%, and 73.09 mol% for N 2 , CH 4 , and CO 2 , respectively. A low yield of 49.67 mol% C 8 –C 15 alkanes in H 2 medium suggested that the H 2 medium reduced catalytic cracking . This was due to the preferential formation of stable heptadecane from 8-heptadecene in the presence of abundant H 2 . The absence of H 2 favored the cracking of 8-heptadecene. These cracked products were further converted to C 8 –C 15 alkanes, for which a mass supply of hydrogen was mandatory. Gas-phase reactions including methanation , Fisher-Tropsch (F-T) synthesis, and water-gas shift (WGS) reactions between deoxygenated gas products and reaction media provided significant pathways for the hydrogen required for the formation of alkanes. The CH 4 medium also acted as a hydrogen source due to its decomposition, catalyzed by nano-Ni/HZSM-5. Coke was substantially formed in all the four media. It was highlighted that the medium of H 2 favored the formation of aliphatic cokes, whereas the non-H 2 media, particularly the CO 2 medium, facilitated aromatic coke species on account of its weak oxidizability. Additionally, there was a severe loss of loaded Ni nanoparticles under H 2 medium but a slight Ni loss in CO 2 medium, which was proposed to the reason of aromatic cokes formation at the catalyst surface , acting as a trap for the loaded Ni nanoparticles.
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高影响因子
Reaction Chemistry & Engineering
·
2019
·Vol. 5
·期 1
·58-65
·
IF 3.935
Qingjie Tang,Ziliang Yuan,Shiwei Jin,Kaiyue Yao,Hanmin Yang,Quan Chi,Bing Liu
There has been a great deal of attention to the development of heterogeneous non-noble metal catalysts for the selective and mild hydrogenation of nitro compounds into primary amines. Herein, a biomass-derived carbon material supported Ni catalyst (Ni/C) was facilely prepared by a one-pot pyrolysis process, and the as-prepared Ni/C catalyst demonstrated a high catalytic activity for the hydrogenation of nitro compounds into primary amines at room temperature. The Ni/C catalyst not only demonstrated a high catalytic activity but also showed a good tolerance to other functional groups. Structurally diverse primary amines were achieved in yields from 92% to 99% within a few hours at room temperature under 5 bar H2. Furthermore, the Ni/C catalyst showed good reusability without the loss of its activity.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 5
·2338-2349
·
IF 2.936
Jing Deng,Chen Ya,Yongjian Ge,Yongqing Cheng,Yijing Chen,Mengyuan Xu,Hongyu Wang
Various transition metals (Fe, Mn, Cu and Ni) were doped into ordered mesoporous Co3O4 to synthesize Co3O4-composite spinels. Their formation was evidenced by transmission electronic microscopy (TEM), X-ray diffraction (XRD) and Brunauer–Emmett–Teller (BET) analysis. It was found that Co3O4-composite spinels could efficiently activate peroxymonosulfate (PMS) to remove enrofloxacin (ENR) and the catalytic activity followed the order Co3O4–CuCo2O4 > Co3O4–CoMn2O4 > Co3O4–CoFe2O4 > Co3O4–NiCo2O4. Moreover, through the calculation of the specific apparent rate constant (ksapp), it can be proved that the Co and Cu ions had the best synergistic effect for PMS activation. The Co3O4-composite spinels presented a wide pH range for the activation of PMS, but strong acidic and alkaline conditions were detrimental to ENR removal. Higher reaction temperature could promote the PMS activation process. Sulfate radical was identified as the dominating reactive species in Co3O4-composite spinel/PMS systems through radical quenching experiments. Meanwhile, the probable mechanisms concerning Co3O4-composite spinel activated PMS were proposed.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 23
·13562-13569
·
IF 12.732
Boran Wang,Mengjie Lu,Duo Chen,Qi Zhang,Wenwen Wang,Yutang Kang,Zhenxing Fang,Guangsheng Pang,Shouhua Feng
Self-supported nickel–iron nitride microsheet arrays coated with carbon are grown on commercial Ni foam (NixFeyN@C/NF) and used as an electrocatalyst for splitting of alkaline seawater. The porous architecture and superhydrophilic/superaerophobic surface ensure sufficient exposure of active sites and mass transfer. The synergetic coupling effect between the carbon coating and NixFeyN facilitates electron transport. The optimal anode (Ni3FeN@C/NF) and cathode (Ni3N@C/NF) electrocatalysts are employed to assemble a two-electrode seawater electrolyzer for overall alkaline seawater electrolysis, which delivers a large current density of 500 mA cm−2 at a low cell voltage of 1.91 V. The superior corrosion-resistance and electron conductivity of the electrocatalyst are responsible for its excellent durability up to 100 hours. This result suggests that transition-metal nitrides coated with carbon offer an effective route to fabricate high-performance and durable hybrid electrocatalysts for hydrogen production from seawater electrolysis.
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高影响因子
Nanoscale
·
2015
·Vol. 7
·期 40
·16874-16879
·
IF 7.394
Jianyu Chen,Jun Chen,Yi Li,Weixin Zhou,Xiaomiao Feng,Qingli Huang,Jian-Guo Zheng,Ruiqing Liu,Yanwen Ma,Wei Huang
Coating nickel onto copper nanowires (Cu NWs) by one-pot synthesis is an efficient approach to improving the oxidation resistance of the nanowires. Because Ni is much less conductive than Cu, it is of great importance to understand the relationship between the thickness of the Ni coating layer and the properties of NWs. Here we demonstrate one-pot synthesis of Cu–Ni core–shell NWs with a tunable Ni thickness by simply varying the Cu and Ni mole ratio in the precursor. We have observed that an increase in Ni thickness decreases the aspect ratio, surface smoothness and network conductivity of the resulting NWs. However, Cu–Ni NWs with a thicker Ni layer display higher oxidation temperature. The optimal Cu–Ni NWs, which were prepared using a Cu2+/Ni2+ molar ratio of 1/1, have a Ni-layer thickness of about 10 nm and the onset oxidation temperature of 270 °C. The derived transparent conductive films present a transmittance of 76% and a sheet resistance of 300 Ω sq−1. The flexible heater constructed from such high quality Cu–Ni NW films demonstrates effective performance in heating and defrosting.
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高影响因子
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