ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xinlong Bao,Yuemin Li,Lianshan Sun,Jianxun Zhao,Peng Chen,Heng Liu,Xinwei Wang,Wanqiang Liu
How to design the components of the cathode carrier is very important for the adsorption and catalysis of polysulfide conversion. Herein, Ni-Mo 2 C codoped hollow carbon nanospheres were prepared by two-step solvent synthesis and subsequent heat treatment. Ni as a supplementary material, it can effectively solve the problems of few electrochemical active sites and poor catalytic effect of lithium polysulfide (LPS) of Mo 2 C carbon nanospheres, and the optimal ratio of Ni to Mo 2 C was explored. Through the comparison of electrochemical tests, the Ni-Mo 2 C carbon nanospheres of optimal proportion shows high discharge specific capacity (0.2 C, 1101.3 mAh· g − 1 ) and excellent rate performance (2 C, 692.9 mAh· g − 1 ), which shows the best catalytic and adsorption effect on LPS. In addition, the optimal proportion of Ni-Mo 2 C carbon nanospheres has the highest lithium ion diffusion coefficient, which can accelerate the transport of Li + and the kinetics of electrochemical reaction.
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DOI
高影响因子
ACS Catalysis
·
2017
·
IF 10.614
Ming Xu,Shan He,Hao Chen,Guoqing Cui,Lirong Zheng,Bin Wang,Min Wei
The modulation of strong metal–support interaction (SMSI) plays a key role and remains a challenge in achieving the desired catalytic performance in many important chemical reactions. Herein, we report a TiO2–x-modified Ni nanocatalyst with tunable Ni–TiO2–x interaction via a two-step procedure: preparation of Ni/Ti mixed metal oxide (NiTi–MMO) from NiTi-layered double hydroxide (NiTi–LDH) precursor, followed by a further reduction treatment at different temperatures. A combination study (XRD, TEM, H2-TPR, XPS, and in situ EXAFS) verifies that a high reduction temperature enhances the Ni–TiO2–x interaction, which results in an increased coverage degree of Ni nanoparticles by TiO2–x as well as electron density of interfacial Ni (Niδ−). Moreover, the creation of a Niδ−–Ov–Ti3+ interface site (Ov denotes oxygen vacancy) induced by strong Ni–TiO2–x interaction serves as dual-active site to efficiently catalyze the water–gas shift reaction (WGSR). The optimized catalyst (Ni@TiO2–x(450)) via tuning Ni–TiO2–x interaction gives a TOF value of 3.8 s–1, which is ∼7 times larger than the conventional 15%Ni/TiO2(450) catalyst. Such a high catalytic efficiency is attributed to the interfacial site (Niδ−–Ov–Ti3+) with medium strength of metal–support interaction, as revealed by in situ diffuse reflectance Fourier transform infrared spectroscopy (in situ DRIFTS), which promotes the synergic catalysis between Niδ− and oxygen vacancy toward WGSR.
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高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 10
·2515-2522
·
IF 2.799
Zhang Zhenwei,Jiang Xingmao,Hu Jianheng,Yue Chuanjun,Zhang Jintao
Mesoporous nitrogen-doped carbon was synthesized in a controlled manner by a modified deep eutectic solvent method using silica nanoparticles as templates. Various amounts of urea and glucose, which contain hydrogen acceptor and hydrogen bond donor groups were heated and stirred to form homogeneous liquid precursors like deep eutectic solvents, and nitrogen element was uniformly dispersed on an atom scale. Ni-Mo sulfides supported on mesoporous carbon with varying N dopping exhibit excellent hydrodesulfurization (HDS) catalytic performance such as high conversion and good recycling stability in the HDS of dibenzenethiophene. Further investigation showed that a suitable N content in the carbon support enhance the HDS properties and the HDS conversion could reach up to 96%. Graphical
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高影响因子
AICHE JOURNAL
·
2019
·Vol. 65
·期 8
·e16616
·
IF 3.463
Daofei Lv,Jiayu Chen,Yongwei Chen,Zewei Liu,Yuzhi Xu,Chongxiong Duan,Houxiao Wu,Ying Wu,Jing Xiao,Hongxia Xi,Zhong Li,Qibin Xia
Metal–organic frameworks (MOFs) combined with selective adsorption capacity of ethane over ethylene and good moisture stability are highly urged by adsorption industrial community. Here, the moisture stability mechanism of Zr-bptc, UiO-66, PCN-245, and Ni(bdc)(ted) 0.5 were investigated by moisture stability experiments, and computational simulation of metal node-linker breaking energy caused by water. Results show that the moisture stability follows the order of Zr-bptc > UiO-66 > PCN-245 > Ni(bdc)(ted) 0.5 . The different moisture stability for these MOFs is likely attributed to the bond strength between metal center and ligands, the coordination number of metal center, the hydrophobicity of framework, as well as the degree of interpenetrated framework. Additionally, comparing with ethylene-selective MOFs, ethane-selective MOFs have fewer coordinatively unsaturated metal sites. Breakthrough experiments indicated that Zr-bptc is the promising material for ethane/ethylene separation.
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高影响因子
Journal of Macromolecular Science Part B-Physics
·
2016
·
IF 0.62
Shaoping Yang,Shiyu Fu,Juanjuan Liu,Yiming Zhou
Hydrogels based on cellulose-graft-poly (acrylic acid) copolymers (C-g-AA) were synthesized by graft copolymerization in a phosphoric acid solvent. Fourier transform infrared (FT-IR) spectra confirmed the structure of the C-g-AA. The adsorption behaviors of the hydrogels for Cu(II) and Ni(II) were investigated. The results showed that their adsorption capacity increased as the initial concentrations of metal ions and the pH value of the solution increased. Freundlich and Langmuir isotherm models were employed to analyze the data from batch adsorption experiments. The results indicated that there were very good correlation coefficients for their linearized equations. The maximum adsorption amounts of the hydrogels for the metal ions, based on the Langmuir model, were 182 and 200 mg/g for Cu(II) and Ni(II), respectively. When the initial concentration of metal ions was 1000 mg/g the actual adsorption amounts of the hydrogels for Cu(II) and Ni(II) were 181 and 183 mg/g, respectively.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Weijia Li,Xinyu Yang,Yueying Zhang,Xidong Hao,Tong Liu,Xishuang Liang,Fangmeng Liu,Xu Yan,Fengmin Liu,Yuan Gao,Jian Ma,Geyu Lu
In this work, carbon fiber carrying platinum-nickel alloy is used as a sensing electrode material to develop a H 2 S gas sensor based on Nafion proton membrane. Characterizations of the material by X-ray diffraction (XRD), scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS) reveal that the structure and morphology of the particles change with the ratio of the alloy. The electrochemical specific area (ECSA) of the material is calculated by cyclic voltammetry, which further proves the influence of alloy formation on the catalytic performance of the materials. When the ratio of platinum to nickel is 1:1, the material is uniformly loaded and its catalytic performance is optimal. Thus, the device made with it has the highest sensitivity. The sensor's low detection limit is 0.2 ppm. For the incorporation of nickel, the sensitivity is increased to -0.306 μA/ppm, which is 18 % higher than before. Not only does the sensor have good repeatability and short response recovery time, the presence of oxygen and water vapor does not have much effect on the sensor. Therefore, it has a great application potential in the field of gas detection at room temperature.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Weiji Dai,Ye Pan,Kai Ren,Yin-an Zhu,Tao Lu
Highly active and low-cost electrocatalysts toward oxygen evolution reaction are urgently-needed in the field of energy conversion. Previous works have demonstrated that pyrite-phase sulfides are promising electrocatalysts for oxygen evolution reaction, however the true active materials are still undetermined. Here, we report heteroatom Ni alloying into FeS 2 crystal via a facile ball-milling reaction method to enhance electrocatalytic performances of pyrite-phase FeS 2 . A series of (Fe 1-x Ni x )S 2 nanocrystalline materials are synthesized to systematically investigate the effects of Ni alloying on FeS 2 toward oxygen evolution reaction electrocatalysis . To achieve an current density of 10 mA cm −2 , the (Fe 0.5 Ni 0.5 )S 2 at carbon fiber paper electrode requires an overpotential as low as 241 mV with a Tafel slope of 51.8 mV dec −1 in 1 M KOH solution. Further investigations reveal that the derived hybrids of Fe 3 O 4 nanoflakes and nanoporous Ni doped FeOOH are true active materials for the (Fe 0.5 Ni 0.5 )S 2 under oxygen evolution reaction conditions. This study not only reveals the true active materials of the heteroatom alloyed bimetallic sulfides, but also provides a facile strategy to regulate the formation of active materials for enhanced oxygen evolution catalysis.
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高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Qihao Li,Xin Wang,Chenzhao Liu,Xinwei Yang,Cheng Li,Lichao Jia,Jian Li
Reduced Ce 0.9 Ni 0.1 O 2-δ consists of Ni nanoparticles and Ni-doped CeO 2 (CNO), named (Ni@CNO) with Ni nanoparticles uniformly distributed on CNO substrate with high oxygen vacancy concentration and good water absorption capability. Thus Ni@CNO demonstrates moderate catalytic activity and high carbon deposition resistance during CH 4 steam-reforming. When it is infiltrated into Ni 0.9 Fe 0.1 (NF) metallic support for metal-supported solid oxide fuel cells (MS-SOFCs), forming a continuous coating, Ni@CNO offers CH 4 steam-reforming activity additional to that of the NF support with increased H 2 /CH 4 ratio (3.38 at 600 °C) in the reforming gas, enhanced carbon deposition resistance, and prolonged performance durability. With the Ni@CNO-infiltrated NF support (NFNC), Ni/Ce 0.9 Gd 0.1 O 2-δ (Ni-GDC) function anode, GDC electrolyte, and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ /Ce 0.9 Gd 0.1 O 2-δ (LSCF-GDC) cathode, the MS-SOFC cell directly fueled by wet CH 4 (3 vol% H 2 O) exhibits a peak power density of 0.343 W cm −2 and the cell voltage durably maintains above 0.6 V at 400 mA cm −2 during a test of 280 h at 600 °C without noticeable carbon deposition in the support and the functional anode. Such performance is comparable to and higher than those reported, suggesting that NFNC is a promising option for direct-CH 4 MS-SOFCs.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wenlei Yin,Jiayan Yang,Keyang Zhao,Anyang Cui,Jiaoyan Zhou,Wei Tian,Wenwu Li,Zhigao Hu,Junhao Chu
Photodetectors based on p-type metal oxides are still a challenge for optoelectronic device applications. Many effects have been paid to improve their performance and expand their detection range. Here, high-quality Cu1–xNixO (x = 0, 0.2, and 0.4) film photodetectors were prepared by a solution process. The crystal quality, morphology, and grain size of Cu1–xNixO films can be modulated by Ni doping. Among the photodetectors, the Cu0.8Ni0.2O photodetector shows the maximum photocurrent value (6 × 10–7 A) under a 635 nm laser illumination. High responsivity (26.46 A/W) and external quantum efficiency (5176%) are also achieved for the Cu0.8Ni0.2O photodetector. This is because the Cu0.8Ni0.2O photosensitive layer exhibits high photoconductivity, low surface states, and high crystallization after 20% Ni doping. Compared to the other photodetectors, the Cu0.8Ni0.2O photodetector exhibits the optimal response in the near-infrared region, owing to the high absorption coefficient. These findings provide a route to fabricate high-performance and wide-detection range p-type metal oxide photodetectors.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Ningyuan Jiang,Yi Feng,Zhuhan Liu,Miao Yu,Gang Qian,Jingcheng Zhang,Zijue Zhou
La 2 Sn 2 O 7 has high melting point and excellent thermal stability, which improves the wettability between matrix and reinforcement. In this study, La 2 Sn 2 O 7 powder was synthesized by chemical coprecipitation method, and Ag-Ni-La 2 Sn 2 O 7 composites were prepared by vacuum hot-pressing sintering. The effect of La 2 Sn 2 O 7 content on the arc erosion behavior of Ag-Ni-La 2 Sn 2 O 7 composites was studied. The Ag-Ni-La 2 Sn 2 O 7 (85:12:3) composite has the lowest arc energy and the highest breakdown strength . With the increase of La 2 Sn 2 O 7 content, the defects on the cathode surface decrease and the erosion areas become flat. After arc erosion, the samples generate Ag 2 O, NiO, La 2 O 3 and SnO 2 . In this study, the mechanism of La 2 Sn 2 O 7 to improve the anti-arc erosion capability of composites is mainly enhancing the viscosity of the molten pool by the ``pinning'' action, consuming energy by the decomposition of La 2 Sn 2 O 7 , and the promotion of arc movement.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·Vol. 12
·期 2
·112109
·
IF 7.4
Nguyen Tien Hoang
In this study, a novel Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La (denoted as SnO 2 -Sb@Ni-La(H)) was successfully prepared by hydrothermal method . The fabricated SnO 2 -Sb@Ni-La(H) electrode exhibited the superior electrocatalytic properties: high oxygen evolution potential (2.34 V vs. SCE), low charge transfer resistance (73.4 Ω cm −2 ), and highest degradation efficiency of benzoic acid (BA) ( k BA = 0.112 min −1 ), compared with other electrodes. The degradation rate of BA on the SnO 2 -Sb@Ni-La(H) was 3.6-fold, 4.7-fold, and 7-fold higher than that of SnO 2 -Sb@Ni-La(T), Ti/TiO 2 Blue, and Ti/SnO 2 -Sb, respectively. The study showed that •OH was the main radical contributing to pollutants degradation and the first-order degradation rate of organic pollutants in electrochemical oxidation (EO) process depends on their reactivity towards •OH ( k •OH,OP ), except for the case of methyl orange (MeO). Among the proposed combination methods, the combination of adsorption and electrochemical oxidation (rGO + EO process) exhibited excellent performance: the first-order degradation rate of P-nitrosodimethylaniline ( k RNO ) in (rGO + EO) process increased by 1.42-fold, compared with the EO process alone. This can be explained by the synergy effect from adsorption of RNO on rGO and the degradation of RNO during the EO process. The hydrothermal deposition combined with thermal decomposition can significantly improve the physical and electrochemical oxidation properties of the Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La electrode: k RNO increased by 3.5-fold, compared with that of 1-time deposition by hydrothermal deposition. In addition, the effect of some operating parameters was investigated, including pH, current density, cathode size and distance of electrodes. This study provided a new method to prepare high-performance Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La electrode and proposed some methods to improve the removal efficiency of the pollutants.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yuanhui Shen,Chongyan Ruan,Qian Jia,Ying Pan,Hongguang Jin
Chemical looping dry reforming of methane (CL-DRM) is a novel CO2 utilization technology, producing high-quality syngas. Herein, the perovskite oxygen carriers La(Fe0.8–xNixAl0.2)O3 (x = 0, 0.2, 0.4, 0.6, and 0.8) were investigated for the CL-DRM process. Remarkably, La(Fe0.4Ni0.4Al0.2)O3 exhibited 93% CH4 conversion, 100% CO2 conversion, and 100% CO selectivity at 800 °C. Combined activity and characterization results suggest that the doping of Al promotes the nucleation of Ni and the growth of Ni-Fe nanoparticles. Owing to the redox exsolution effect during the cycles, the oxygen carriers are modified with abundant Ni-Fe catalytic sites on the surface, which exhibit excellent catalytic activity, oxygen capacity, and structural stability. In addition, the carbon cycle, which consists of methane decomposition and carbon oxidation, is catalyzed by Ni-Fe nanoparticles for enhanced CH4 and CO2 conversion during the cyclic redox process. We anticipate that the engineering of nanocatalytic sites on oxygen carriers will be conducive to obtaining target products for CL-DRM process optimization.
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PubMed
高影响因子
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