JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·113505
·
IF 4.316
Yapeng Kong,Yu Xiao,Xuemin Liang,Yuran Chen,Liqiang Wang
The availability of casting Ni–Fe alloy as inert anode for direct electro-reduction of V2O3 in molten Na3AlF6-K3AlF6-AlF3 was investigated. The electrochemical oxidation behavior of anode as well as microstructural evolutions of formed oxide scale were systematically studied. The electrochemical characterization and reaction mechanism of the cathode oxide were also investigated to evaluate the influence of alloy anode on cathodic reduction process. The in situ formed three-layered oxide scale is compact and coherent, which is composed of an outermost Fe2O3 + FeAl2O4 skin layer, a Fe2O3 middle layer and a FeAl2O4 inner layer. The skin layer has a continuous, smooth structure and shows electrochemical activity. The Fe2O3 layer with a compact structure prevents inward diffusion of electrolyte and outward migration of metal cations. The innermost FeAl2O4 layer shows a loose structure and functions as a buffer layer to improve the peeling resistance of oxide scale. With the continuous extension of polarization time, the inner FeAl2O4 layer is slowly oxidized and becomes thinner, simultaneously, the dense Fe2O3 layer becomes thicker. Ultimately, metal vanadium product with fine rod-like particles can be obtained and the oxygen content in the metal vanadium is below 0.3 mass% within electrolyzing time of 2 h. The corresponding current efficiency is around 63%.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Zongtang Liu,Congcong Ding,Pingting Gao,Yunxia Xu,Yufeng Sun,Xiaoju Wen,Jingtao Dai,Zhenghao Fei
For the first time, the dechlorination of 2,6-dichlorophenol (2,6-DCP) by carbon nanotubes supported Fe/Ni nanoparticles (CNTs-Fe/Ni) was studied to explore the practicability of environmental remediation. Removal capacity of CNTs-Fe/Ni for 2,6-DCP was enhanced obviously compared to Fe/Ni due to reduced aggregation of Fe/Ni nanoparticles .The removal efficiency increased as the increase of CNTs-Fe/Ni dosage and Ni loading, whereas it decreased as the increase of 2,6-DCP concentration. Weak acidic condition was considered to be advantageous to 2,6-DCP dechlorination. The dechlorination kinetics results suggested that the 2,6-DCP removal by CNTs-Fe/Ni accorded with pseudo-first-order equation. Moreover, carbon nanotubes as support accelerated the mass transfer of 2,6-DCP from solution to catalyst surface and promoted the formation of atomic hydrogen, which also led to an enhancement of reactivity of CNTs-Fe/Ni on removing 2,6-DCP.
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高影响因子
FUEL
·
2023
·
IF 7.4
Xinyi Chen,Guangsheng Zou,Yanliang Yuan,Zuwei Xu,Haibo Zhao
The current study investigates a nano-Fe/Ce oxygen carriers (OCs) doped with Ni synthesized by flame spray pyrolysis (FSP) method for the chemical looping dry reforming of methane (CL-DRM). The thermodynamic analysis and reaction simulation of the CL-DRM process with iron-based oxygen carriers are first carried out. The result shows that when reacting with CH 4 , Fe 2 O 3 is reduced to Fe 3 O 4 at first, accompanied by generation of H 2 O and CO 2 , and then to Fe with H 2 and CO production. Fe can be oxidized to Fe 3 O 4 and FeO by CO 2 . Subsequently, based on the reaction patterns obtained from the aforementioned analysis, CL-DRM experiment using Ni-doped Fe/Ce oxygen carriers is conducted in a fixed-bed reactor, and the effects of different Ni doping and reaction conditions on the performance of the oxygen carriers are investigated. The OC with a Ni/Fe molar ratio of 2/98 (2NiFe) achieves over 30% CH 4 conversion and 90% CO selectivity in the partial oxidation step and stable cyclic performance. The FSP process facilitates high dispersion of Ni and formation of NiCe and NiFe alloys, which are stable active sites. Moreover, the transformation of Fe oxides and CeO 2 into CeFeO 3 on the surface of the OC has enhanced lattice oxygen availability and further improved cyclic stability.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Tinghu Wang,Yuzhi Li,Wenjing Zhang,Furang Li,Lei Fan,Jianye Fu,Xinmei Liu,Yuchao Lyu
Acidity of supports always plays a key role in the determination of dispersion and electron density of metal components and then the catalytic behavior of bifunctional catalysts for deoxygenation of biomass-based resources. Herein, Ni/ZSM-5 catalysts with various Si/Al ratios and acidity were synthesized, and the role of acid centers in the deoxygenation of methyl laurate (ML) was discussed. The decreasing Si/Al ratios promote dispersion of Ni due to the anchoring effect of framework Al to nickel species. It also increases the electron density of Ni, which not only benefits the activation of hydrogen but also curbs the cleavage of C–CHO bonds. All of these accelerate ML transformation and preferentially promote the hydrodeoxygenation (HDO) route instead of decarboxylation (DCO2) or decarbonylation ones. The metal centers play a key role in the hydrogenolysis of ML and the hydrogenation of resultant fatty acids, while the acid centers can facilitate these processes. Besides, suitable acidity of the catalyst would increase selectivity to target alkanes and isomerized ones for biojet fuels by enhancing the HDO routes. However, excessive acid centers favor cracking reactions, reducing the selectivity of target products. This work contributes a profound understanding of the role of acid centers in the deoxygenation of ML into biojet fuels and can be extended to other bifunctional deoxygenation catalysts.
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高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
XianYan Jiang,ShuPing Deng,JunJie Liu,Ning Qi,ZhiQuan Chen
In this work, metal oxide/metal@carbon (NiO/Ni@C) composites as electrode materials have been successfully prepared using the pillared Ni 2 (bdc) 2 (dabco) (bdc = 1,4-benzenedicarboxylic acid, dabco = 1,4-diazabicyclo[2.2.2]-octane) as the precursor. Owing to the multiple active sites (NiO, Ni and Carbon), rich oxygen defects, and abundant Ni 3 + , the NiO/Ni@C composites show excellent electrochemical performance. A maximum specific capacitance of 805.3 F g −1 at 0.5 A g −1 and 576.2 F g −1 at 10 A g −1 is obtained for the NiO/Ni@C electrode material calcined at 500 °C, indicating a high rate capability. Meanwhile, the assembled asymmetric supercapacitor (ASC) NiO/Ni@C//PEDOT-AC (poly(3,4-ethylenedioxy-thiophene)-activated carbon) has a wide working voltage of 0–1.7 V, high specific energy of 20.7 W h kg −1 , superior specific power of 12920 W kg −1 , and excellent cycle stability with capacitance retention of 69.7% after 10 000 cycles. Furthermore, a red light-emitting diode (LED) is lighted up by two NiO/Ni@C//PEDOT-AC ASCs in series connection.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 14
·6795-6803
·
IF 11.301
Lang Pei,Jiasong Zhong,Taozhu Li,Wangfeng Bai,Shiting Wu,Yongjun Yuan,Yifan Chen,Zhengtao Yu,Shicheng Yan,Zhigang Zou
Developing a highly efficient and low-cost oxygen-evolution-reaction (OER) electrocatalyst is an important route to overcome the rate-determining step of water splitting. Here, we directly grew a CoS2 nanoarray core with an N-doped graphitic carbon (NGC) shell on Ni foam (NF) to construct a core–shell nanorod array electrode, CoS2@NGC@NF. The CoS2 core with a high work function (∼5.5 eV) tends to capture electrons from the NGC layer (4.5–5.2 eV) to induce an electron-poor NGC shell with a significant downshift of the carbon Fermi level, facilitating the adsorption of O-containing intermediates and affording decreased activation energy during the OER process. As a result, the three-dimensional NGC encapsulated CoS2 array assembly exhibited excellent electrocatalytic OER activity with a low overpotential of 243 mV at a current density of 10 mA cm−2 and a small Tafel slope of 71 mV dec−1 in 1.0 M KOH. Our findings may suggest that manipulating the interface energetics by the work function difference is a potential route to the design of high-performance OER electrocatalysts.
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Environmental Science-Advances
·
2022
·Vol. 1
·期 3
·365-379
·
IF 0
Wenli Qin,Xinyi Zhang,Zefei Chen,Xueya Liu,Manqing Ai,Pingping Zhang,Ying Ye,Zengling Ma
Meso–macroporous MFe2O4@CMT (M = Ni, Co) catalysts were synthesized by coating carbon microtubes (CMTs) employing a calcination method. The obtained materials NiFe2O4@CMT (PCNF) and CoFe2O4@CMT (PCCF) were characterized via X-ray powder diffraction (XRD), pore structure analysis, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The electromagnetic (EM) wave absorption of catalysts was measured and it was found that the maximum reflection loss value of PCCF and PCNF was about −41.50 dB at a thickness of 1.85 mm and −24.70 dB at a thickness of 6.55 mm, respectively. The composite catalysts were prepared for the microwave (MW)-induced Fenton-like catalytic degradation of dimethyl phthalate (DMP). The microwave catalytic activity of PCNF was higher than that of PCCF, which was closely related to its higher concentration of active species, better microwave-absorbing ability and high interaction between NiFe2O4 and CMT. Moreover, the degradation kinetics could be well-fitted by the pseudo-first-order kinetic model. With an increase in the MW power, initial pH, catalyst dosage, and H2O2 concentration, the DMP degradation rate initially increased and then decreased, while it declined continuously with an increase in the initial DMP concentration. The introduction of metal oxides increased the mobility of the surface oxygen, playing a crucial role in the generation of surface oxygen species. The catalysts maintained high stability after five reaction cycles. The overall findings provide new insight into PCCF and PCNF under MW irradiation for the degradation of DMP and other relevant organic pollutants.
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International Journal of Electrochemical Science
·
2023
·Vol. 7
·期 11
·10825-10834
·
IF 1.5
Zhenhua Yan,Min Wang,Baoxu Huang,Jinsheng Zhao,Renmin Liu
This work discusses a low-cost and high performance catalyst of the oxygen reduction reaction (ORR) in microbial fuel cells (MFCs). The catalyst was formed by Pt–Ni (15 wt% Pt) nanoparticles dispersed on carboxyl multi-wall carbon nanotubes (Pt-Ni/MWNT). The catalyst particle presents a nano- crystalline structure and has an average diameter of ca.7.1 nm based on the X-ray diffraction and transmission electron microscopy measurement. The electrocatalytic stability and activity of the catalyst was evaluated by cyclic voltammogram and chronopotentiometry. The MFC with a Pt-Ni/MWNT cathode produced a maximum power density of 1.22 W/m 2 , which was close to that with a Pt/C (20 wt% Pt) cathode (1.40 W/m 2 ); the Coulombic efficiency reaches 31.6%, which was better than that of the Pt/C (29.3%). The total cost of a Pt-Ni/MWNT catalyst was much lower than that of a Pt/C catalyst. Thus, the Pt-Ni/MWNT probably provides a new solution for finding effective cathode materials for MFC.
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SURFACE & COATINGS TECHNOLOGY
·
2016
·
IF 2.139
Yun Chen,Yali Hao,Wei Huang,Yan Ji,Wenzhong Yang,Xiaoshuang Yin,Ying Liu,Xiang Ling
Ni-P-nano-Al 2 O 3 composite coatings on the mild steel were obtained by adding Al 2 O 3 nanoparticles into the traditional electroless Ni-P bath. Cationic and anionic surfactants were used to prevent the agglomeration of the incorporated nano-Al 2 O 3 . Surface morphology , compositions and microstructures of the coating were studied using scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD) as well. Corrosion resistances of the modified mild steel samples were evaluated in 3.5 wt.% NaCl solution by electrochemical impedance spectroscopy (EIS). The results showed that compared to the pure Ni-P coating on the mild steel, the coating formed in the bath with 6 g/L nano-Al 2 O 3 performed the highest resistance. Under the optimal conditions, the adding of anionic surfactant (SDBS) improved the anti-corrosion performance of the samples further, while the addition of cationic surfactant led to a worse corrosion resistance. The potential mechanism was that anionic surfactant molecules would contact with active sites of Ni-P composite coating and nano-Al 2 O 3 in the bath, which would improve the dispersion of nano-Al 2 O 3 , thus leading to a homogeneous coating with better corrosion resistance.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 3
·235
·
IF 2.8
Chi Mengjiao,Liu Yahan,Zhou Tao,Mao Minmin,Liu Bing,Wang Ge,Song Kaixin
A cold sintering process (150 °C, 90 min, and 800 MPa) is employed to pre-densify (Mg 1 − x Ni x ) 3 B 2 O 6 (0.00 ≤ x < 0.10, MNBO) ceramics to 80% relative density, followed by a post-annealing treatment between 800 and 950 °C. The origin of optimizations of the sintering, microstructure, and dielectric properties of Ni 2+ -substituted Mg 3 B 2 O 6 ceramic are investigated in detail. All the samples are the single phase of magnesium borate, as confirmed by XRD and Raman spectra. The crystallographic lattice parameters of all compositions are obtained by full-pattern Rietveld refinement. It is found that the ε r of MNBO ceramics is related to the relative density and the ionic polarization of chemical bonds. The change of atomic filling fraction and half peak width is found to be an important effect on the Q × f value. The optimum microwave dielectric properties ( ε r = 6.92, Q × f = 24,336 GHz, τ f = − 53.43 ppm/°C) and the relative density of MNBO ceramics (92.4%) are obtained for composition with 4% Ni 2+ .
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CHINESE CHEMICAL LETTERS
·
2021
·Vol. 33
·期 6
·3272-3276
·
IF 6.779
Na Li,Guangmeng Qu,Xixi Zhang,Shunshun Zhao,Chenggang Wang,Gang Zhao,Peiyu Hou,Xijin Xu
The selection and development of cathode of alkaline zinc batteries (AZBs) is still hindered and often leads to poor rate capability and short cycle life. Here, amorphous hollow nickel-cobalt-based sulfides nanocages with nanosheet arrays (AM-NCS) are designed and constructed with ZIF-67 as the self-template to exchange with Ni 2+ and S 2− by using a two-step ion exchange method. The synthesized AM-NCS possess the high specific capacity (160 mAh/g at 2 A/g), and the assembled battery has excellent rate performance (146 mAh/g reversible capacity at 5 A/g). The assembled device has excellent rate performance (155 mAh/g at 2 A/g) and long cycling stability (7000 cycles, 62.5% of initial capacity). The excellent electrochemical properties of the electrode materials are mainly attributed to the unique structure, in particular, polyhedron structure with hollow structure can improve the cyclic stability, and the amorphous structure can expose more reactive sites on the surfaces of nickel, cobalt and sulfur. This work provides a new strategy for the design and fabrication of high performance cathode materials for AZBs.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 13
·132505
·
IF 3.721
Xiangyu Ren,Jie Tang,Cunying Xu,Shuxian Wang,Jianru Li,Jingling Lu,Yixin Hua,Qibo Zhang,Juanjian Ru
The electrodeposition behavior of Zn–Ni alloy on a Cu electrode has been studied in the choline chloride-urea-ethylene glycol (ChCl-urea-EG) based deep eutectic solvent (DES). The nickel and zinc sources are introduced into the solvent by the dissolution of nickel oxide (NiO) and zinc oxide (ZnO), respectively. Cyclic voltammetry indicates that the electroreduction of Ni(II) or Zn(II) species in the DES is a diffusion-controlled process and the diffusion coefficient of Zn(II) species is an order of magnitude larger than that of Ni(II) species. Under the examined condition, the anomalous codeposition of Zn–Ni alloy is observed, which is different from normal codeposition of Zn–Ni alloy in similar DESs using metal chlorides as precursor. The deposition potential is found to play an important role in controlling the composition and surface morphology of the resultant Ni-Zn alloys. The phase structure of the deposits depends on the Ni content, and changes from a mixture of η-phase and γ-phase to single γ-phase with (411) plane orientation. A mechanism for this electrodeposition process has been proposed on the basis of the formation of complex ions [NiO·urea·Cl]−, [ZnO∙urea·Cl]− and [ChCl·O·urea]2− in ChCl-urea-EG-ZnO-NiO electrolyte during the electrodeposition, emphasizing that the metal oxides were dissolve in DES by forming metal complex ions, the cathodic reduction of metal complex ions generates complex ions [ChCl·O·urea]2− with alloys (NixZny), and [ChCl·O·urea]2− is oxidized to release O2 at anode.
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危险品化学品经营许可证（带存储）