JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 31
·期 2
·1483-1490
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IF 2.195
Zhang Nan,Li Jinfeng,Men Xiusen,Li Zhigang,Zhao Hongtao
A novel electromagnetic functionalized Ni@PPy composite was synthesized with a cleaning method. XRD and FTIR analyses showed that the Ni@PPy composite was successfully prepared. SEM, TEM, and HRTEM results proved that Ni nanoparticles, produced by the γ-irradiation-induced reduction method, were wrapped with polypyrrole (PPy) shell to form core–shell structure. There existed many Ni cores in a PPy shell, which could induce more interfacial and dipolar polarization than the structure with one core in a shell. With an increase in Ni content, the dielectric loss was obviously decreased and the magnetic loss had little change. Attenuation constant decreased gradually, which was influenced jointly by conductivity loss and dipolar and interfacial polarization loss. When nPy/nNi/nAPS was 1.75:1:1.75, the as-prepared Ni@PPy composite exhibited the highest microwave absorption (RL max of − 48 dB at 7 GHz and EAB of 3.8 GHz) owing to suitable impedance matching as well as attenuation ability. Therefore, such core–shell structured Ni@PPy composite would be a promising microwave absorber.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Puhui Deng,Mengxiang Gan,Xue Zhang,Zhuzhu Li,Yu Hou
The use of non-noble-metal to replace precious metal as co-catalyst in solar-driven hydrogen evolution reaction (HER) is important for lowering hydrogen production cost. In this work, nickel metal nanoparticles loaded nitrogen-doped graphite carbon nitride (NiNCN3) was prepared, which significantly enhanced the HER activity of nitrogen-doped graphite carbon nitride. The hydrogen evolution rate of NiNCN3 can reach to 1507 μmol g −1 h −1 , much higher than that of 3 wt % Pt/NCN (1055 μmol g −1 h −1 ). The distinguished photocatalytic performance is due to the accelerated electron transfer efficiency and inhibited photogenerated electron-hole recombination. Our study offers an alternative method to achieve the low-cost and effective noble-metal-free photocatalyst for HER.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Zihao Zhang,Zhe Chen,Xin Gou,Hao Chen,Kequan Chen,Xiuyang Lu,Pingkai Ouyang,Jie Fu
Ni/AC (nickel on active carbon) catalysts with different Ni loadings were synthesized and studied for the decarboxylation and aromatization of oleic acid in the absence of H2 or hydrogen donors. Without the use of hydrogen source, the whole deoxygenation process became more economical. Moreover, oleic acid can be saturated using the H2 derived from the production of aromatics, which were also considered as the critical component in aviation biofuels. The structure and properties of the catalysts were investigated using X-ray diffraction, transmission electron microscopy, and temperature-programmed desorption of CH3COOH and CO. The experimental and characterization results revealed that 30% Ni/AC had a higher adsorption capacity of CH3COOH among the other Ni/AC catalysts and highly dispersed and small Ni particles, providing a heptadecane yield of 40.7%. It also contained 13.8% aromatics, which fulfills the requirement of aviation fuels. This Ni/AC catalyst showed good stability even after being reused thrice.
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ACS Omega
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2018
·
IF 0
Changhui Zhu,Qiying Liu,Dan Li,Haiyong Wang,Caihong Zhang,Chunhua Cui,Lungang Chen,Chiliu Cai,Longlong Ma
Crystal α-zirconium phosphate (α-ZrP) was prepared by a hydrothermal method and exfoliated into a layered structure by n-hexylamine (C6H13NH2). Ni-based catalyst (Ni/ZrP) was promoted by loading nickel on the layered α-ZrP via ion exchange. The catalyst was performed to catalyze hydrodeoxygenation of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF), and a 68.1% yield of DMF and 100% conversion of HMF were achieved at 240 °C, 5 MPa H2, and 20 h. The DMF yield can still retain 52.8% after five cycles. The characteristics of the catalyst were investigated via N2 adsorption–desorption, X-ray diffraction, field emission scanning electron microscopy, high-resolution transmission electron microscopy, pyridine-adsorbed Fourier transform infrared (FTIR) spectra, FTIR spectra, inductively coupled plasma mass spectrometry, and thermogravimetric analysis–mass spectrometry, as well as Raman spectroscopy. A pathway from HMF to DMF was found with MF as the intermediate product, and DMF production was preferable via the −CH2OH group hydrogenolysis of HMF over Lewis acidic sites of Ni/ZrP, which is caused by the zirconium vacant orbits.
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PubMed
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Jie Guo,Yongjiang Hou,Bo Li,Yulei Liu
Ni–Co–B hollow nanospheres were synthesized by the galvanic replacement reaction using a Co–B amorphous alloy and a NiCl 2 solution as the template and additional reagent, respectively. The Ni–Co–B hollow nanospheres that were synthesized in 60 min (Ni–Co–B-60) showed the best catalytic activity at 303 K, with a hydrogen production rate of 6400 mL hydrogen min −1 g catalyst −1 and activation energy of 33.1 kJ/mol for the NaBH 4 hydrolysis reaction . The high catalytic activity was attributed to the high surface area of the hollow structure and the electronic effect. The transfer of an electron from B to Co resulted in higher electron density at Co sites. It was also found that Ni was dispersed on the Co–B alloy surface as result of the galvanic replacement reaction. This, in turn, facilitated an efficient hydrolysis reaction to enhance the hydrogen production rate. The parameters that influenced the hydrolysis of NaBH 4 over Ni–Co–B hollow nanospheres (e.g., NaOH concentration, reaction temperature, and catalyst loading) were investigated. The reusability test results show that the catalyst is active, even after the fifth run. Thus, the Ni–Co–B hollow nanospheres are a practical material for the generation of hydrogen from chemical hydrides .
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SENSORS
·
2018
·Vol. 18
·期 10
·3493
·
IF 2.475
Yingang Gui,Xiaoxing Zhang,Peigeng Lv,Shan Wang,Chao Tang,Qu Zhou
SF6decomposition components detection is a key technology to evaluate and diagnose the insulation status of SF6-insulated equipment online, especially when insulation defects-induced discharge occurs in equipment. In order to detect the type and concentration of SF6decomposition components, a Ni-modified carbon nanotube (Ni-CNT) gas sensor has been prepared to analyze its gas sensitivity and selectivity to SF6decomposition components based on an experimental and density functional theory (DFT) theoretical study. Experimental results show that a Ni-CNT gas sensor presents an outstanding gas sensing property according to the significant change of conductivity during the gas molecule adsorption. The conductivity increases in the following order: H2S > SOF2> SO2> SO2F2. The limit of detection of the Ni-CNT gas sensor reaches 1 ppm. In addition, the excellent recovery property of the Ni-CNT gas sensor makes it easy to be widely used. A DFT theoretical study was applied to analyze the influence mechanism of Ni modification on SF6decomposition components detection. In summary, the Ni-CNT gas sensor prepared in this study can be an effective way to evaluate and diagnose the insulation status of SF6-insulated equipment online.Keywords:SF6decomposition components;carbon nanotube sensor;Ni modification;adsorption;DFT calculations
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Le-Qing Fan,Fei Pan,Qiu-Mei Tu,Yun Gu,Jian-Ling Huang,Yun-Fang Huang,Ji-Huai Wu
Recently more and more concerns have been paid on ternary metal sulfides for use in supercapacitors because of their better electrochemical performances compared with binary counterparts. In this work, CuCo 2 S 4 nanosheet arrays on Ni foam were prepared by a sequential ion-exchange strategy under hydrothermal conditions, where Co 3 O 4 was converted into Co 4 S 3 by an anion-exchange reaction between Co 3 O 4 and S 2− ions, subsequently the Co 4 S 3 was transformed into CuCo 2 S 4 through a cation-exchange reaction with Cu 2+ ions. The as-prepared CuCo 2 S 4 was characterized by powder X-ray diffraction, high-resolution X-ray photoelectron spectroscopy, field emission scanning electron microscopy and transmission electron microscopy . The CuCo 2 S 4 arrays were composed of interconnected thin nanosheets with thickness of about 10 nm. The CuCo 2 S 4 nanosheet arrays on Ni foam were directly employed as a binder-free electrode showing a high specific capacitance of 3132.7 F g −1 at a current density of 1 A g −1 . Besides, an asymmetric supercapacitor based on this synthesized CuCo 2 S 4 electrode as positive electrode and active carbon as negative electrode can deliver a high energy density of 46.1 Wh kg −1 at a power density of 991.6 W kg −1 , and exhibits good rate capability and cycling stability.
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Micro & Nano Letters
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2018
·Vol. 13
·期 10
·1373-1377
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IF 0.841
Hui Zhao,Yuqing Miao
The Ni–W–S nanoparticles (NPs) were synthesised on Ti mesh through the typical hydrothermal method. The obtained Ti/Ni–W–S was characterised on morphology, composition and electrocatalytic property. It showed good electrocatalytic performance towards glucose oxidation in strong alkali electrolyte, exhibiting the potential application in the field of fuel cell. The excellent electrocatalytic activity of Ni–W–S NPs, the favourable electron transfer between electrode and catalysts, as well as the high conductivity of Ti contributed to its final catalytic performance of Ti/Ni–W–S.
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JOURNAL OF MEMBRANE SCIENCE
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2018
·
IF 6.578
Xinru Zhang,Tao Zhang,Yonghong Wang,Jinping Li,Chengcen Liu,Nanwen Li,Jiayou Liao
Mixed-matrix membranes (MMMs) for CO 2 /N 2 separation were prepared by incorporating nickel-substituted ZIF-8 (Zn/Ni-ZIF-8) into a polyether-block-amide (PEBA2533) polymer, in which the Zn and Ni ions in Zn/Ni-ZIF-8 have different affinities for CO 2 based on π-complexation; these MMMs exhibited exceptional molecular sieving properties compared to ZIF-8-PEBA MMMs. Scanning electron microscopy revealed that Zn/Ni-ZIF-8 nanoparticles were small and uniformly distributed within the PEBA, and attenuated total reflectance Fourier-transform infrared spectroscopy revealed good interfacial compatibility between the Zn/Ni-ZIF-8 and PEBA; consequently these MMMs exhibited excellent mechanical properties . The 10% Zn/Ni-ZIF-8-PEBA MMM showed a high CO 2 permeability of 321 Barrer, and a CO 2 /N 2 selectivity of 42.8 at 2 bar; these values were much higher than those of the 10% ZIF-8-PEBA MMM (266 Barrer and 33.8, respectively). We assume that different metal-ion affinities towards CO 2 resulted in the asymmetric adsorption/desorption behaviour of these MMMs, which led to a significantly higher permselectivity for the Zn/Ni-ZIF-8-PEBA MMM. The MMM loaded with 10% Zn/Ni-ZIF-8 exhibited long-term CO 2 -separation-performance stability under mixed-gas conditions, with a CO 2 permeability of 282 Barrer and a CO 2 /N 2 selectivity of 42.7. Moreover, the permselectivity of the 10% Zn/Ni-ZIF-8-PEBA MMM under pure-gas condition surpassed Robeson's upper bound reported in 2008.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Liming Yang,Zhenglin Chen,Dan Cui,Xubiao Luo,Bin Liang,Lixia Yang,Tian Liu,Aijie Wang,Shenglian Luo
Electrocatalytic hydrodechlorination is deemed as a promising environmental remediation technology for fast and effective detoxification of halogenated antibiotic pollutants. In this study, a novel nickel (Ni) foam electrode decorated by ultrafine palladium (Pd) nanoparticles (denoted as Pd@Ni-foam) was reported for electrocatalytic dechlorination of florfenicol (FLO, a typical antibiotic). The Pd@Ni-foam electrode was synthesized via a facile and simple spontaneous galvanic replacement of surface Ni atoms of Ni foam with Pd precursor. The obtained Pd@Ni-foam catalyst showed an excellent performance on electrochemical dechloridation of FLO. The dechloridation efficiency of FLO (20 mg L −1 ) reached 99.5% with the dechloridation rate as fast as 16.58 mg min −1 at cathode potential of –1.2 V ( vs . saturated Ag/AgCl), which far prevailed over pure Ni foam (2.63 mg min −1 ) and commercial Pd/C (11.32 mg min −1 ). The reaction rate constant (0.044 min −1 ) of FLO dechloridation at Pd@Ni-foam electrode was 44 and 4.4 times higher than that of pure Ni-foam (0.001 min −1 ) and commercial Pd/C (0.010 min −1 ), respectively. The excellent electrocatalysis for FLO dechloridation of Pd@Ni-foam cathode is ascribed to the 3D self-supported Ni-foam frame for mass transfer enhancement and the formation of Pd-Ni micro-interfaces leading to the high utilization of atomic H*. Furthermore, the toxicity assessment showed that the antibacterial activity of FLO was complete elimination after electrocatalytic dechlorination process.
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Journal of Energy Chemistry
·
2018
·
IF 3.886
Shuai Wang,Jiguo Tu,Jiusan Xiao,Jun Zhu,Shuqiang Jiao
The growing global demands of safe, low-cost and high working voltage energy storage devices trigger strong interests in novel battery concepts beyond state-of-art lithium-ion battery. Herein, a dual-ion battery based on nanostructured Ni 3 S 2 /Ni foam@RGO (NSNR) composite anode is developed, utilizing graphite as cathode material and LiPF 6 -VC-based solvent as electrolyte. The battery operates at high working voltage of 4.2–4.5 V, with superior discharge capacity of ∼90 mA h g −1 at 100 mA g −1 , outstanding rate performance, and long-term cycling stability over 500 cycles with discharge capacity retention of ∼85.6%. Moreover, the composite simultaneously acts as the anode material and the current collector, and the corrosion phenomenon can be greatly reduced compared to metallic Al anode. Thus, this work represents a significant step forward for practical safe, low-cost and high working voltage dual-ion batteries, showing attractive potential for future energy storage application .
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CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Jingqing Tian,Haocheng Li,Xin Zeng,Zichun Wang,Jun Huang,Chen Zhao
ABSTRACT Development of dry reforming of methane and carbon dioxide is an effective route to convert in-dustrial waste gases such as coke-oven gas and coal-to-oil gas into platform syngas. However, this process encounters severe problems of metal particle sintering and coke formation at high tem-peratures. In this work, we developed a new synthetic method for preparing confined Ni/MCM-41 catalysts, which impede the sintering of metal nanoparticles (NPs) and coke deposition at high temperatures, enabling them to be successfully applied to methane dry reforming . The method results in high activity and stability of the catalyst at 700 °C for 200 h. The Ni precursor is immersed in ethanol and impregnated into MCM-41 by the peculiar capillary action of hexagonal straight mesopores . By this method, 10 wt% Ni NPs (d = 2 nm) is equably confined to the mesoporous channels with strong metal-support interactions, as confirmed by HRTEM, TEM mapping, H2-TPR, and XRD measurements. Such a confined structure has a significant effect on the inhibition of metal NP agglomeration and carbon deposition during methane dry reforming, as evidenced by TEM, Raman, TGA, and TPO measurements of used Ni/MCM-41 catalysts. In contrast, unconfined Ni/MCM-41 catalysts, with Ni NPs located on the pore exteriors, are rapidly deactivated after 12 h due to the blocked contact between the active metal centers and the gas feedstock. Additionally, a fast increase in the Ni NP size and the formation of substantial carbon nanotubes on the unconfined catalyst surface are seen. This work offers a facile approach for the synthesis of anti-sintering, car-bon-resistant confined Ni catalysts that can operate at high temperatures
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