FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Qi Wang,Jinlei Chen,Xingyong Li,Xinyu Yang,Yankun Wu,Shuirong Li,Yueyuan Ye,Duo Wang,Dechao Wang,Zhifeng Zheng
Red mud (RM) is a strongly solid waste from alumina production, and the disposal of RM leads to series of environmental problems such as alkalization of occupied land and pollution of nearby water systems. Using RM as catalyst or carrier is one of the important methods for the comprehensive utilization of RM. Herein, the application of Ni supported RM (Ni/RM) for the efficient hydrodeoxygenation (HDO) of waste oils to produce hydrocarbon-based biofuels is reported. The structural properties of Ni/RM catalysts were investigated. The catalytic performance for HDO of palmitic acid as the model compound was evaluated. The results showed that RM calcinated at low temperature (400–600 °C) has a larger specific surface area and well dispersion of Ni, while the high calcination temperature (700 °C ~ 900 °C) results in sintering of metal oxides and lower dispersion of Ni. Ni/RM-500 shows the largest specific surface area of 77 m 2 /g. The conversion of palmitic acid over Ni/RM-500 is 100% at 250 °C, and alkanes are the only products at 300 °C. The reaction path of HDO and DCO/DCO 2 is related to reaction temperature. The Ni/RM-500 shows the feasibility to different feedstocks. Finally, the catalytic performance of Ni/RM-500 was tested for 135 h, and the main reason causing the deactivation of Ni/RM-500 was revealed.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 43
·期 5
·2389-2399
·
IF 3.201
Beirong Ye,Chao Gong,Miaoliang Huang,Jinhua Ge,Leqing Fan,Jianming Lin,Jihuai Wu
NiSe rods coated with cotton-like Ni3S2 were directly grown on nickel foam through a two-step process, comprising selenization and electrodeposition. The as-obtained NiSe/Ni3S2 composite electrode exhibited excellent electrochemical properties, with a high specific capacitance of 8.81 F cm−2 (1259.3 F g−1) at a current density of 4 mA cm−2, which was better than the value of pure NiSe electrode (5.17 F cm−2; 861.8 F g−1) at the same current density. Moreover, an asymmetric supercapacitor (ASC) was fabricated using NiSe/Ni3S2 electrode and AC electrode as positive electrode and negative electrode, respectively. This ASC extended the potential window to 1.6 V and was possessed of a superior energy density of 38.7 W h kg−1 at a power density of 192 W kg−1, with outstanding cycling stability (85.9% retention after 10 000 cycles).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yanei Xue,Penghui Shao,Yixing Yuan,Wenxin Shi,Yuan Guo,Bing Zhang,Xian Bao,Fuyi Cui
The dimensions and structure of conventional photocatalysts severely limit their industrial applications. In view of this, a novel monolithic supported macroscopic catalysts (SMCs) was successfully designed and developed for the first time. The visible-light responsive and reusable Zn 0.95 Fe 0.05 S@TiO 2 /nickel foam (ZFS@TiO 2 /NF) SMCs was assembled with ZFS particle catalyst as a light responder that was protected by defective TiO 2 as a carriers capture layer, the multihole and flexile nickel foam material was induced into photocatalytic system with the function of supporting and charge storage. This integrated material exhibited an unprecedentedly high utilization of carriers by a new set of unique “generation-capture-migration-utilization” path, which was attributed to the key properties of the integration of three independent materials. Furthermore, the loading operation can maximum exert dimensions and interfaces optimization of ZFS and TiO 2 . This work proposes a novel mechanism of charge transfer for rational design of macro photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Tao Song,Qinglong Luo,Fengfeng Gao,Bing Zhao,Xiaogang Hao,Zhong Liu
Technical research on electrochemical acid-free desorption of boron is imminent, and layered nickel hydroxide is a potential boron-responsive active electrode material. In this paper, nickel hydroxide was used to remove boron from aqueous resources by electro-assisted and conventional adsorption methods. The option of conditions by nickel hydroxide adsorption for boron is mild (pH: 7 ∼ 9) with an exothermic process. Interestingly, the synergistic effect of physical and chemical adsorption improves the adsorption rate and adsorption capacity of nickel hydroxide for boron under the action of the electric field, and the adsorption performance is better at low voltage (0.2 ∼ 0.4 V). The equilibrium time of the electro-assisted method is 4 times shorter than conventional adsorption methods, and the maximum adsorption capacity can reach 57.5 mg/g than conventional adsorption (45.4 mg/g). In addition, the nickel hydroxide has selectivity in high-concentration anion solutions and can be easily regenerated by an alkaline solution. Therefore, it is expected that nickel hydroxide with the electro-assisted method could be a potential approach for the high-efficiency and eco-friendly removal of boron.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Wei Xiong,Min Zhou,Hao Li,Zhao Ding,Da Zhang,Yaokang Lv
ABSTRACT Owing to its cost-effectiveness and adjustable eight-electron distribution in the 3 d orbital, nickel oxide (NiO) is considered an effective electrocatalyst for an ambient electrochemical nitrogen reduction reaction (NRR). However, because of the low conductivity of the transition metal oxide electrocatalyst, its application in this field is limited. In this study, we found that the doping of NiO nanosheets with a small amount (3–10 nm) of Pt nanoparticles (Pt/NiO-NSs) leads to considerable improvements in the Faradaic efficiency (FE) and NH 3 yield compared with those obtained using pure NiO, breaking the common perception that commercial Pt-based electrocatalysts demonstrate little potential for NRR due to their high hydrogen evolution tendency. In a 0.1 mol/L Na 2 SO 4 solution at −0.2 V vs. RHE, a typical Pt/NiO-2 sample exhibits an optimum electrochemical NH 3 yield of 20.59 μg h –1 mg –1 cat. and an FE of 15.56%, which are approximately 5 and 3 times greater, respectively, than those of pure NiO nanosheets at the same applied potential. X-ray photoelectron spectroscopy analysis revealed that Pt in Pt/NiO-NSs exist as Pt 0 , Pt 2+ , and Pt 4+ and that high-valence Pt ions are more electropositive, thereby favoring chemisorption and the activation of N 2 molecules. Density function theory calculations showed that the d -band of Pt nanoparticles supported on NiO is significantly tuned compared to that of pure Pt, affording a more favorable electronic structure for NRR. The results of this study show that Pt can be an effective NRR electrochemical catalyst when loaded on an appropriate substrate. Most importantly, it provides a new synthetic avenue for the fabrication of highly active Pt-based NRR electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ANALYTICAL LETTERS
·
2015
·
IF 1.03
Lifeng Wang,Zhufeng Lu,Qiong Cheng,Lichun Liu
Nickel-nickel oxide core-shell nanorod array electrodes were fabricated and a preliminary application for nonenzymatic glucose determination exhibited excellent performance. The nanorod array electrode was synthesized for the first time by an anodic aluminum oxide template assisted electrochemical deposition technique. Facile oxidation was employed to convert nickel at the outer surface of the nanorods to nickel oxide, resulting in a nickel-nickel oxide core-shell nanorod array. The successful conversion was confirmed by x-ray diffraction, cyclic voltammetry, and scanning electron microscopy. The modified electrode possessed high surface area contributed by the nanorods, and efficient mass transfer due to the wide internanorod gap. The electrode provided high sensitivity (127 microampere square centimeter per millimolar), a low limit of detection (∼0.5 micromolar), and a long linear dynamic range (up to 14 millimolar) for the determination of glucose. Accurate determination of glucose in human serum was performed. This synthetic strategy may have further application for the preparation of high surface area thin-film electrodes for a variety of applications.
研究领域:
纳米技术
·
电化学
·
生物传感器
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xiaoyan Wang,Ying Xie,Wei Zhou,Xiuwen Wang,Zhicheng Cai,Zipeng Xing,Mingxia Li,Kai Pan
The hierarchical electrocatalysts with the superaerophobic property are in favor of removal of gas bubbles and supply of numerous active sites to improve the electrochemical catalytic activity for water splitting. In this work, the self-supported Zn-doped CoNiP (Zn–CoNiP/NF) hierarchical structure that consisted of nanothorns and radial microspheres were prepared with via a facile precursor phosphorization method. Zn-doping could tailor the initial electronic state of CoNiP to improve the hydrogen or oxygen atom binding, which effectively promoted the catalytic kinetics of water splitting. The hierarchical structure not only offered more catalytic active sites for water splitting, but also facilitated gas releasing due to the superaerophobic interface. The hierarchical Zn–CoNiP structure showed a high hydrogen evolution reaction (HER) efficiency in electrolytes with pH 0–14, which yielded low overpotentials of 73 mV in acidic solution and 34 mV in alkaline media at current density of 10 mA cm −2 . Furthermore, it also had evidenced by an overpotential of 310 mV for oxygen evolution reaction (OER) at the current density of 50 mA cm −2 . Note that the required cell initial voltage was 1.51 V for overall water splitting. These results were comparable or even better than many non-noble catalysts.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Xuan Guo,Hua Deng,Qiang Fu
Materials with low dielectric constant have drawn more and more attention due to their wide range of applications in electronic devices. Two type of methods are often used to reduce the dielectric constant of a given materials: introducing voids and replacing groups having higher polarizability with the ones having lower through copolymerization . Different from above methods, current study proposes a novel and efficient method by allow inorganic filler participating the curing process of polymer matrix , thus, consuming some of the functional groups with high polarizability. Nickel hydroxide (Ni(OH) 2 ) is selected as filler to be dispersed in room temperature vulcanized silicone rubber (SR). The addition of 1% Ni(OH) 2 into SR has resulted a decrease in dielectric constant from 3.1 to 2.1, and slightly reduced dielectric loss. With further increasing Ni(OH) 2 content, the dielectric constant increases gradually. From various characterizations, it is confirmed that Ni(OH) 2 is involved in the curing process of SR, thus, the hydroxyl group content in the final composites is reduced. Meanwhile, Ni(OH) 2 with different size and synthesized Ni(OH) 2 from hydrothermal process is also used to further confirm such observation. This method provides a novel route for the preparation of low dielectric constant materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Fanghui Wang,Yimeng Luo,Yajun Zhang,Yanan Wang,Hong Zhu
A NiO–Ni foam composite carrier was prepared by the hydrothermal method. Ruthenium metal was supported on the NiO–Ni foam by electroplating, obtaining a highly active bush-like Ru/NiO–Ni foam catalyst. To investigate the effect of NiO on the structure and performance of the catalyst, a Ru/Ni foam catalyst was prepared as a reference. The structures of the carrier and both catalysts were characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, and the performances of both catalysts were evaluated in alcoholytic hydrogen production from sodium borohydride. On the carrier with the NiO-treated surface, the active component Ru developed a three-dimensional bush-like structure that enhanced the catalytic activity. Indeed, the hydrogen production from alcoholysis of sodium borohydride was three times higher on the Ru/NiO–Ni foam catalyst than on the Ru/Ni foam catalyst, and the highest rate exceeded 6 L/g/min. The repeated-use stability of the Ru/NiO–Ni catalyst (10 times) also exceeded that of Ru/Ni foam (8 times). However, as both catalysts used the same active component (i.e., Ru), their activation energies were almost identical.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Xiaoli Feng,Haifeng Wang,Xuechao Liu,Canming Wang,Hongzhi Cui,Qiang Song,Kun Huang,Neng Li,Xue Jiang
Inconel 625 + x Al ( x = 0, 2.5, 5.0, 7.5, 10.0) alloy coatings were prepared by laser cladding. The addition of Al promoted the formation of the BCC phase, which changed the coating microstructure from an FCC + δ phase + Laves phase to FCC + BCC + δ phase + Laves phase. Inconel 625 + 2.5 Al alloy showed the greatest corrosion resistance among all samples. The formation of an Al 2 O 3 film improved the corrosion resistance of the coating, but excess Al decreased the Cr 2 O 3 content in the film, which decreased the corrosion resistance of the coating. Increasing the Al content aggravated the lattice distortion and improved the solid solution strengthening effect, while also increasing the amount of BCC phase, which improved the coating hardness. After adding Al, the Inconel 625 + x Al alloy coatings displayed strong plastic deformation resistance, and their wear resistance was improved due to the presence of a hard phase.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Jun-Shuai Zhang,Wei-De Zhang
Developing earth-abundant H 2 -production heterogeneous photocatalysts with robust activity and stability has attracted great interests. Herein, a low-cost photocatalyst was prepared by binding nickel complex covalently from primary amines of chitosan (NiL) onto photosensitive carbon nitride nanosheets (CN) through electrostatic interaction. Introduction of NiL results in more efficient utilization of solar energy, photogenerated electrons’ direct transfer and lower overpotential for water reduction. The optimized NiL3-CN photocatalyst shows the highest H 2 evolution rate of 346 μmol g −1 h −1 under visible light irradiation and exhibits high stability during test. This work presents great potentials for sustainable conversion of solar energy, and sheds positive light on the development of heterogeneous photocatalysts via anchoring H 2 -evolving molecule catalysts confined by inexpensive macromolecules onto a semiconductor photosensitizer through a facile and valid method.
研究领域:
材料科学
·
催化化学
·
可再生能源
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Xin An,Wei Jiang,Jing He,Linhua Zhu,Lingchao Xu,Hongping Li,Wenshuai Zhu,Huaming Li
Modulating the electronic characteristics of catalysts plays a significant role in optimizing their catalytic activity. Herein, Mn-doped nickel molybdate (MNMO) nanorods are synthesized via replacing the partial Ni sites by the Mn element, engineering a bimetallic synergistic effect to enhance the activation of oxygen (O2). Compared with the extremely low catalytic activity of pristine nickel molybdate (NiMoO4), complete desulfurization can be achieved by MNMO under the same reaction conditions. Characterization results show that the electronic structure and surface atomic composition of pure NiMoO4 will be modulated owing to the introduction of Mn atoms, leading to the enhancement of the oxygen vacancy content and stronger O2 activation capacity. Besides, the optimized catalyst MNMO-20 also displays satisfactory cycle performance, and the sulfur removal of dibenzothiophene still maintains 96.1% after six times of recycling. The distinctive engineering strategy and simple synthesis method provide a new insight in designing and developing oxidative desulfurization catalysts with high stability and effectivity.
研究领域:
催化材料
·
环境化学
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）