JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Ruirui Zhao,Jiaxing Liang,Jiajun Huang,Ruiyu Zeng,Jiafeng Zhang,Hongyu Chen,Guang Shi
Al 2 O 3 and AlPO 4 single-coated and double-coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 materials have been synthesized by a wet-coating method in this paper. XRD , XPS , SEM, TEM, DSC as well as electrochemical methods are employed to investigate the structure, surface properties, thermal stability as well as electrochemical properties . The obtained layers are homogenously coated on the particles and the coating thickness is around 20–30 nm, the surface compositions are analyzed by XPS in detail as well. Comparing with those single-coated or uncoated samples, the double-coated one exhibits more superior thermal stability as well as electrochemical properties. The possible reason is mainly due to the dense and uniform coating layer as well as the formation of Li 3 PO 4 and LiAlO 2 on the cathode surface. Based on these results, it seems that Al 2 O 3 and AlPO 4 double-coating is an efficient strategy in improving the properties of LiNi 0.5 Co 0.2 Mn 0.3 O 2 materials, which can be also applied to other Ni-rich layered materials.
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高影响因子
ELECTROCHIMICA ACTA
·
2016
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IF 4.803
Zhicai Xing,Dewen Wang,Qun Li,Abdullah M. Asiri,Xuping Sun
Earth-abundant Ni has emerged as an interesting catalytic material toward electrochemical hydrogen evolution reaction (HER) in alkaline media, but developing high-performance Ni-integrated HER catalysts is still a big challenge. Herein, we describe the development of self-standing Ni-tungsten nitride heterostructure nanowires array on conductive carbon cloth (Ni-WN/CC) as a highly efficient 3D hydrogen-evolving cathode in 1.0 M KOH with catalytic activity outperforming most reported Pt-free HER catalysts. This Ni-WN/CC electrode exhibits a negligible onset overpotential and a Tafel slope of 71 mV dec −1 . It demands overpotentials of only 47, 70, and 155 mV to drive 10, 20, and 100 mA cm −2 , respectively, with its activity being maintained for 10 h. Such high hydrogen evolution activities are due to electrocatalytic synergistic effects of Ni and WN.
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高影响因子
ACS Applied Materials & Interfaces
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2016
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IF 7.145
Yuan Pan,Yunqi Liu,Yan Lin,Chenguang Liu
The enhancement of catalytic performance of cobalt phosphide-based catalysts for the hydrogen evolution reaction (HER) is still challenging. In this work, the doping effect of some transition metal (M = Fe, Ni, Cu) on the electrocatalytic performance of the M–Co2P/NCNTs (NCNTs, nitrogen-doped carbon nanotubes) hybrid catalysts for the HER was studied systematically. The M–Co2P/NCNTs hybrid catalysts were synthesized via a simple in situ thermal decomposition process. A series of techniques, including X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma-optical emission spectrometry, transmission electron microscopy, and N2 sorption were used to characterize the as-synthesized M–Co2P/NCNTs hybrid catalysts. Electrochemical measurements showed the catalytic performance according to the following order of Fe–Co2P/NCNTs > Ni–Co2P/NCNTs > Cu–Co2P/NCNTs, which can be ascribed to the difference of structure, morphology, and electronic property after doping. The doping of Fe atoms promote the growth of the [111] crystal plane, resulting in a large specific area and exposing more catalytic active sites. Meanwhile, the Feδ+ has the highest positive charge among all the M–Co2P/NCNTs hybrid catalysts after doping. All these changes can be used to contribute the highest electrocatalytic activity of the Fe–Co2P/NCNTs hybrid catalyst for HER. Furthermore, an optimal HER electrocatalytic activity was obtained by adjusting the doping ratio of Fe atoms. Our current research indicates that the doping of metal is also an important strategy to improve the electrocatalytic activity for the HER.
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PubMed
高影响因子
Plasma Processes and Polymers
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2016
·Vol. 14
·期 6
·1600076
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IF 2.713
Danhua Mei,Bryony Ashford,Ya-Ling He,Xin Tu
In this study, plasma-catalytic reforming of simulated biogas for the production of value-added fuels and chemicals (e.g., H 2 ) has been carried out in a coaxial dielectric barrier discharge (DBD) plasma reactor. The influence of four Ni catalysts (Ni/γ-Al 2 O 3 , Ni/MgO, Ni/SiO 2 , and Ni/TiO 2 ) on the plasma-catalytic biogas reforming has been investigated in terms of the conversion of reactants, the yield and selectivity of target products, the carbon deposition on the catalysts, and the energy efficiency of the plasma-catalytic process. The use of plasma combined with these Ni catalysts enhanced the performance of the biogas reforming. A maximum CO 2 conversion of 26.2% and CH 4 conversion of 44.1% were achieved when using the Ni/γ-Al 2 O 3 catalyst at a specific energy density (SED) of 72 kJ l −1 . Compared to other Ni catalysts, placing the Ni/γ-Al 2 O 3 catalyst in the DBD produced more syngas and C 3 C 4 hydrocarbons, but less C 2 H 6 . The lowest energy cost (EC) for biogas conversion and syngas production, as well as the highest energy efficiency and fuel production efficiency (FPE), were achieved when using the Ni/γ-Al 2 O 3 catalyst in the plasma process. The Ni/γ-Al 2 O 3 catalyst also showed the lowest surface carbon deposition of 3.8%, after catalysing the plasma biogas reforming process for 150 min at a SED of 60 kJ l −1 . Compared to other Ni catalysts, the enhanced performance of the Ni/γ-Al 2 O 3 catalyst can be attributed to its higher specific surface area, higher reducibility and more, stronger basic sites on the catalyst surface.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Silin Li,Hengyong Tu,Feng Li,Muhammad Tuoqeer Anwar,Lijun Yu
In order to improve the performance of intermediate temperature solid oxide fuel cells (IT-SOFCs), the effect of partial substitution of the transition metal M = Co, Cu, Fe and Mn for Ni in Nd 2 NiO 4+δ on the crystal chemistry, electrical conductivity , thermal stability, chemical reactivity with YSZ electrolyte and electrochemical performance has been systematically investigated. The electrochemical performances of the cathode materials are tested on planar NiO-YSZ anode-supported cells fabricated with YSZ as electrolyte in size of 50 mm × 50 mm. Compared to Nd 2 NiO 4+δ , each Nd 2 Ni 0.9 M 0.1 O 4+δ material shows a decrease in electrical conductivity and an increase in lattice volume, oxygen vacancy concentration and chemical reactivity with YSZ electrolyte. The cell with Nd 2 Ni 0.9 Co 0.1 O 4+δ cathode achieves the maximum power density of 530 mW cm −2 at 0.7 V at 800 °C. The cell with Nd 2 Ni 0.9 Cu 0.1 O 4+δ cathode is the most stable in short-term test. A small amount of B-site doping in Nd 2 NiO 4+δ does not cause any change in the cathode microstructure. The study demonstrates that a tradeoff between oxygen transport properties and electrical conductivity can be accomplished by appropriate selection of transition metal and level of cation B-site doping in Nd2NiO4+δ. Nd2Ni0.9M0.1O4+δ (M = Co, Cu) can be considered to be potential cathode materials in IT-SOFCs.
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高影响因子
RSC Advances
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2017
·Vol. 7
·期 79
·50358-50366
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IF 3.108
Yue Wang,Xianfeng Zhang,Xin Li,Yang Liu,Xiaoping Wang,Xi Liu,Jian Xu,Yongwang Li,Yongguang Liu,Hang Wei,Peng Jiang,Minghui Liang
Iron oxide nanoparticles intercalated in Ni(OH)2 nanosheets were prepared in a spontaneous way for the cathode materials of asymmetric supercapacitors. The soluble precursor of Ni(OH)2, Ni(NH3)6(OH)2, was used for growth on α-Fe2O3 nanoparticles. The loading percentages of Ni(OH)2 in the Ni(OH)2–α-Fe2O3 nanocomposites had a great influence on the morphology and size of Ni(OH)2. The composites were characterized by TEM, SEM, ICP-OES, XRD and XPS. The specific capacitance of Ni(OH)2 in the composite can reach 1107 F g−1 at a scan rate of 20 mV s−1, and the specific capacitance of the Ni(OH)2–α-Fe2O3 composite can be up to 376 F g−1 at a scan rate of 5 mV s−1. More importantly, the fabricated Ni(OH)2–α-Fe2O3//AC (activated carbon) asymmetric supercapacitor exhibited energy density and power density of 31.6 W h Kg−1 and 474 W Kg−1, respectively. The cycling performance of the asymmetric supercapacitor was also excellent, and the capacitance retention reached 89.6% after 5000 charge–discharge cycles. Red, blue and yellow LED lights can be lit up with two series of asymmetric supercapacitors, revealing their potential application in energy storage.
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高影响因子
Journal of Environmental Chemical Engineering
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2016
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IF 0
Jian Long,Xubiao Luo,Xiaocui Yin,Xing Wu
An unfamiliar functional monomer 2-(Allylmercapto) nicotinic acid (ANA), which contains both N and S groups that have a strong coordinating ability with nickel ions, is used for imprinting Ni(II). The obtained Ni(II) ion-imprinted polymer (Ni-IIP) shows a fast uptake ability for the removal of Ni(II), and its adsorption equilibrium time is less than 20 min. The maximum Ni(II) adsorption capacity of Ni-IIP is found to be 38.85 mg/g, that is, more than double that of non-imprinted polymer (Ni-NIP) (18.38 mg/g), at a temperature of 30 °C and optimum pH of 6. Additionally, the adsorption is a spontaneous and endothermic process according to the obtained thermodynamic parameters. Besides, Ni-IIP shows excellent selectivity factors of 33.63, 219.59, 4.23, 16.89 and 32.74 for Ni 2+ /Zn 2+ , Ni 2+ /Mg 2+ , Ni 2+ /Co 2+ , Ni 2+ /Cd 2+ and Ni 2+ /Cu 2+ , respectively. Moreover, the Ni-IIP used is stable because the adsorption capacity is 82.7% of the initial saturation binding capacity up to the 5th cycle. Most notably, the application of Ni-IIP in wastewater samples shows a high removal efficiency for Ni(II) of more than 93.4%. The results indicate that the Ni-IIP is an effective adsorption material, allowing for the selective removal of Ni(II) from aqueous solutions at high efficiency.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Shuyu Qi,Zilong Zhao,Yingqing Ou,Lu Liu,Yatao Ren,Wenyi Dong,Hongjie Wang,Zigong Ning
In this study, a calcium-rich biochar (CRB)-enhanced dual reaction center (DRC) Fenton-like catalyst, Cu-Al 2 O 3 -CRB, was synthesized for the decomplexation of a typical heavy metal complex pollutant, Ni-ethylenediaminetetraacetic acid (Ni-EDTA), in industrial wastewater. After a 90-minute reaction, the removal rate of Ni(II) could reach 95.2%, regardless of the initial solution pH. Various characterization analyses confirmed the formation of electron-rich Cu regions and electron-deficient Al and C regions in the Cu-Al 2 O 3 -CRB catalyst. The catalytic oxidation experiments, chronoamperometry tests, and reactive oxygen species (ROSs) detection further revealed the roles of biochar and CaCO 3 on the catalytic behavior of Cu-Al 2 O 3 -CRB catalyst. The presence of biochar not only enhanced the loading of Cu species but also introduced additional electron transfer channels, while CaCO 3 further interacted with biochar/Cu species to amplify the electron cloud density surrounding Cu. The improvement of electronic polarization facilitated the activation of H 2 O 2 and the generation of •O 2 – , 1 O 2 and •OH. Contrary to conventional interfacial reactions, the weak adsorption between Cu-Al 2 O 3 -CRB and Ni-EDTA due to the electrostatic repulsion, led to the decomplexation reactions primarily occurring in the solution phase, rather than on the catalyst surface. This study sheds light on the potential of Cu-Al 2 O 3 -CRB as a DRC catalyst and emphasizes the significance of contaminant properties when using this kind of catalysts.
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高影响因子
ENERGY
·
2025
·
IF 9.4
Da Cui,Peng Zhang,Shuang Wu,Hon Man Luk,Yixi Wu,Bin Liu,Shuo Pan,Jingru Bai,Qing Wang,Xuehua Zhang
Oil shale has garnered significant attention as a supplementary energy source to traditional fossil fuels. In this study, we investigated the catalytic hydrothermal liquefaction (HTL) of shale oil sludge using three catalysts (Fe, Na 2 CO 3 , Ni/Al 2 O 3 ) and three combinations in pairs. The hydrothermal oil (HTO) yield, energy recovery (ER), and conversion rate (CR) of organic matters were comprehensively analyzed under six catalyst conditions. Both Fe + Na 2 CO 3 and Fe + Ni/Al 2 O 3 paired catalyst combinations achieved similar HTO yields of 28.43 % and 28.13 % along with ER values of 56.19 % and 57.94 % respectively. Moreover, these two groups achieved remarkably high CR values of 81.88 % and 81.02 %, respectively. The HTO from the Fe + Ni/Al 2 O 3 combination has the highest H/C ratio and the lowest O/C ratio at 1.682 and 0.032, respectively. Elemental composition, Fourier transform infrared spectroscopy (FT-IR), and gas chromatography-mass spectrometry (GC-MS) analyses of HTO were conducted in this study. The HTO produced by using Fe + Ni/Al 2 O 3 exhibited the most ideal distillation distribution, with fractions below diesel accounting for up to 96.94 %. Based on the catalytic functions of Fe, Ni, and Al 2 O 3 , six potential synergistic mechanisms of Fe + Ni/Al 2 O 3 were summarized. These mechanisms highlighted Fe + Ni/Al 2 O 3 's roles in promoting compound conversion pathways in HTO, ultimately revealing the synergistic catalytic mechanism.
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高影响因子
Chemical Engineering and Processing-Process Intensification
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2024
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IF 3.8
Muhammad Umair Mushtaq,Zhu Lin,Danni Li,Khurram Shahzad Ayub,Zain Abbas,Waqas Qamar Zaman,Ji Yang
The oxygen reduction reaction (ORR) is fundamental in numerous electrochemical energy conversion technologies, necessitating efficient catalysts to enhance reaction kinetics and reduce precious metal usage. This study focuses strategic clustering of Pt-Ni on Calcium Oxide/activated carbon (C/Ca) aerogels. Electrochemical analyses confirmed that incorporating Ni into Pt matrices significantly enhanced ORR activities with Pt 25 Ni 75 -C/Ca composition emerged as optimum. A positive shift in half-wave potential (905 mV vs. RHE) and impressive mass activity (72.50 Ag −1 at 85 V) highlight the potential of this composite as a highly effective and stable ORR catalyst. Pt-C/Ca demonstrated performance fluctuation, while Pt 25 Ni 75 -C/Ca showed remarkable stability after 40,000 cycles. Furthermore, C/Ca aerogels exhibited a significantly increased BET surface area, and the presence of Pt-Ni/pyridinic-N species on its surface C/Ca aerogel provided supplementary active sites that facilitated the adsorption and reduction of O 2 during ORR.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Wei Zeng,Sheng-Qi Su,Ying-Min Qin,Jing-Zhe Wu,Jiang-Nan Ke,Yong-Gang Sun,Xi-Jie Lin
Ni-rich layered oxides offer numerous advantages such as high discharge capacity, cost-effectiveness, and environmental friendliness, making them the mainstream cathodes for high-energy density lithium-ion batteries. However, their widespread commercialization is hindered by critical challenges in cycling performance, stemming from unstable interface and structure, particularly at elevated charge cut-off voltages. Herein, a dual-modification strategy combining La doping and La 4 NiLiO 8 coating was proposed to synergistically enhance the surface/interface and structure stability of the LiNi 0.83 Co 0.11 Mn 0.06 O 2 (referred to as NCM83) cathode. Unlike conventional methods, a well-designed La(OH) 3 coating pretreatment was employed on the Ni 0.83 Co 0.11 Mn 0.06 (OH) 2 precursor. This pretreatment aimed to facilitate the in-situ formation of La doping and La 4 NiLiO 8 during the lithiation of the coated precursor, while ensuring desired uniformity of the La 4 NiLiO 8 coating and La doping. This dual-modification strategy integrated the advantages of both La doping and La 4 NiLiO 8 coating, demonstrating excellent capability to improve the overall performance of NCM83. The La doping, acting as a pillar, not only strengthened the layered structure of the cathode to mitigate volume changes, but also enhanced Li + diffusion by broadening the c axis spacing. The La 4 NiLiO 8 coating efficiently protected the cathode from H 2 O/CO 2 attack and electrolyte erosion, while also facilitating Li + transport owing to its favorable Li-conductive properties. Such a dual-modification strategy significantly enhanced the electrochemical performance of NCM83, as demonstrated by the excellent long-term cyclic stability, rate capability, and thermal stability at a high charge cut-off voltage of 4.5 V. This work highlighted the benefits of integrating elemental doping and surface coating, while offering a promising synthetic protocol for straightforward and effective dual-modification of various cathodes.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Hongdi Zheng,Liuyan Zhang,Yingying Li,Binkai Yuan,Shixuan Wang,Zeyi Guan,Gengzhe Shen,Guibin Tan,Yanmei Zhang
A honeycomb-like porous self-supporting Ni-Al(G) electrode was successfully prepared by low-pressure cold spraying combined with heat treatment. The main components of the electrode were Ni and NiAl. Graphene was uniformly dispersed throughout the electrode, exhibiting a 3-D distribution, which increased the active site of electrode and improved the electron exchange rate. The electrochemical properties of the Ni-Al(G) electrode were characterized using 6 M KOH. As a result, the Ni-Al(G) electrode requires only an overpotential of 130 mV to achieve a current density of 100 mA cm −2 , and a Tafel slope of 35.5 mV dec −1 . In addition, the electrode exhibited excellent stability. The addition of graphene and the honeycomb-like porous structure of the Ni-Al(G) electrode resulted in an excellent hydrogen evolution activity. This study provides a simple and rapid technique for building high-performance, low-cost, and industrially available electrodes for the efficient alkaline HER.
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高影响因子
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