ChemNanoMat
·
2022
·Vol. 8
·期 9
·e202200243
·
IF 3.82
Xueyang Wang,Fanshu Yuan,Dan Xue,Jie Liu,Jie Wei,Yiwen Wang,Jiahui Wang,Qinghua Qu,Qianli Zhang
Graphical A binder-free electrode was constructed by decorating MnO 2 nanoflowers onto the hybrid material of ZIF-8/ZnO, as derived from ZIF-8 via pyrolysis. Both the composite electrode and the NF/ZIF-8-ZnO/MnO 2 //activated carbon (AC) asymmetric supercapacitor demonstrate excellent electrochemical performance, showing that NF/ZIF-8-ZnO/MnO 2 is a promising candidate for supercapacitors due to the synergistic contribution of ZIF-8, ZnO and MnO 2 . In this study, ZIF-8 (Zn(MeIn) 2 , MeIn=2-methylimidazole) was synthesized directly on Ni foam with the use of polydopamine (PDA). By following a hydrothermal process, MnO 2 nanoflowers were decorated on the hybrid material of ZIF-8/ZnO, as derived from ZIF-8 via pyrolysis at 500 °C under nitrogen flow. The produced binder-free electrode (NF/ZIF-8-ZnO/MnO 2 ) demonstrated an excellent electrochemical performance for supercapacitors, including a specific capacitance of 2005 F g −1 at 2 A g −1 and a fairly high cycling stability (90.74% retention after 4000 cycles). Furthermore, a NF/ZIF-8-ZnO/MnO 2 //activated carbon (AC) asymmetric supercapacitor showed an energy density of 70.57 Wh kg −1 given a power density of 112.45 kW kg −1 . These results demonstrate that NF/ZIF-8-ZnO/MnO 2 is a promising candidate for supercapacitors due to the synergistic contribution of ZIF-8, ZnO and MnO 2 .
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高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Xiang Cai,Yu Song,Zhen Sun,Di Guo,Xiao-Xia Liu
In-situ growing of energy storage materials on graphene-based substrates/current collectors with low defect is a good way to boost electron transport and so enhance rate capability for the obtained electrode. Herein, high-quality graphene-like nanopetals are partially exfoliated from graphite foil (GF) through a facile and fast cathodic process. Three-dimensional porous structure is established for the afforded cathodically-exfoliated graphite foil (CEG), with many graphene-like nanopetals vertically anchoring on the graphite substrate. A hierarchical structure is constructed by the following electrochemical growth of Co−Ni double hydroxide nanopetals on the graphene atop CEG. The double hydroxide in the obtained electrode with the optimized Co 2+ /Ni 2+ molar ratio , Co 0.75 Ni 0.25 (OH) 2 -CEG, displays much improved rate capability and so can deliver a high specific capacitance of 1460 F g −1 at an ultra-high current density of 100 A g −1 . An asymmetric device is assembled by using Co 0.75 Ni 0.25 (OH) 2 -CEG as cathode, which demonstrates a high energy density of 31.6 Wh kg −1 at an ultra-high power density of 21.5 kW kg −1 , showing the potential of the hierarchical composite electrode for high power application. The device also displays good stability, it can retain more than 90% of its capacitance after 10000 galvanostatic charge-discharge cycles.
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高影响因子
eScience
·
2022
·
IF 0
Yue Wang,Zhixuan Wang,Dengxu Wu,Quanhai Niu,Pushun Lu,Tenghuan Ma,Yibo Su,Liquan Chen,Hong Li,Fan Wu
Sulfide-based all-solid-state lithium-ion batteries (ASSLIBs) are one of the most promising energy storage technologies due to their high safety and ionic conductivity. To achieve greater energy density, a Ni-rich layered oxide LiNi x Co y M 1-x-y O 2 (NCM, M = Mn/Al, x ≥ 0.6) is desirable due to its relatively high voltage and large capacity. However, interfacial side reactions between the NCM and sulfide solid electrolytes lead to undesirable interfacial passivation layers and low ionic conductivity, thereby degrading the electrochemical performance of NCM sulfide all-solid-state batteries. Herein, a time-/cost-effective sulfidation strategy is exploited to sulfidize a Ni-rich NCM88 cathode in a mixed gas atmosphere of N 2 and CS 2 . A new type of cathode (NCM88-S) with an ultrathin (∼2 nm) surface layer is obtained, which significantly reduces the interfacial side reactions/resistance and improves the interfacial stability. The resulting NCM88-S/Li 6 PS 5 Cl/Li 4 Ti 5 O 12 ASSLIB exhibits superior performance, including a high discharge specific capacity (200.7 mAh g −1 ) close to that of liquid batteries, excellent cycling performance (a capacity retention of 87% after 500 cycles), and satisfactory rate performance (158.3 mAh g −1 at 1C).
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ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Zonghua Pu,Qian Liu,Abdullah H. Qusti,Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Xuping Sun
The present communication reports on the first electrodeposition of Ni(OH) 2 on ZnO array supported on Ni foam. When applied as a binder-free electrode material for pseudocapacitive energy storage, the resulting ZnO@Ni(OH) 2 array exhibits a high specific capacitance of 2028 F g −1 at a current density of 10 A g −1 with good cycling stability. Meanwhile, the array exhibits a superb rate capability. Even at an extremely high current density of 100 A g −1 , the array still shows a very high specific capacitance of 1059 F g −1 .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·
IF 2.93
Ying Wang,Li Wang,Ning Gan,Zi-Yian Lim,Chunzheng Wu,Jun Peng,Wei Guo Wang
Ni/ x Y 2 O 3 –Al 2 O 3 ( x = 5, 10, 15, 20 wt%) catalysts were prepared by sequential impregnation synthesis. The catalytic performance for the autothermal reforming of methane was evaluated and compared with Ni/γ-Al 2 O 3 catalyst. The physicochemical properties of catalysts were characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), X-Ray Photoelectron Spectrometer (XPS), Thermo Gravimetric Analyzer (TGA) and H 2 -temperature programmed reduction techniques (TPR). The decrease of nickel particle size and the change of reducibility were found with Y modification. The CH 4 conversion increased with elevating levels of Y 2 O 3 from 5% to 10%, then decreased with Y content from 10% to 20%. Ni/ x Y 2 O 3 –Al 2 O 3 catalysts maintained high activity after 24 h on stream, while Ni/Al 2 O 3 had a significant deactivation. The characterization of spent catalysts indicated that the addition of Y retarded Ni sintering and decreased the amount of coke.
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Science of Advanced Materials
·
2016
·Vol. 8
·期 7
·1478-1483
·
IF 1.812
Chai Yong-Ming,Shang Xiao,Han Guan-Qun,Dong Bin,Hu Wen-Hui,Liu Yan-Ru,Li Xiao,Liu Chen-Guang
A simple sol–gel thermolysis method has been utilized to prepare plate-like Ni3N films supported on nickel foam (Ni3N/NF) as electrocatalysts for oxygen evolution reaction (OER). The as-prepared samples have been characterized by X-ray diffraction (XRD),
scanning electron microscopy (SEM) and X-ray photoelectron spectra (XPS). XRD shows a typically crystal phase of Ni3N on nickel foam. The broad peak of (100) suggests smaller particle size of Ni3N on NF. SEM images confirm that Ni3N films cover on the surface
of NF. Ni3N films are composed of many uniform nanoparticles, implying larger surface area and more exposed active sites. Electrochemical measurements show that Ni3N/NF exhibits superior OER activity with excellent stability, which can be attributed to more active sites
and the enhanced conductivity derived from NF as support. Ni3N/NF as electrocatalysts for OER may provide novel idea for preparing highly active electrocatalysts from non-noble metallic nitrides.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Mengyang Xu,Bingqing Chang,Jinze Li,Huiqin Wang,Pengwei Huo
The assembly of different Metal organic framework (MOFs) into hybrid heterostructures has proven to be a promising strategy that can effectively break through the limited regulatory capacity of single metal sites. Here, an S-scheme heterostructure (Fe 3 Ni-MOF) based on homologous ligands (1,4-phthalic acid) of ultra-thin Ni-MOF and Fe-MOF nanoparticles with directional electron transport channels, was developed and used it for photoreduction of CO 2 . Under the S-scheme electric field mechanism, the photogenerated carrier can achieve efficient directional separation through Fe–O–Ni atomic bond, which significantly reduces the energy barrier of the rate-determining step. Results show that the performance of Fe 3 Ni-MOF (63.5 μmol g –1 ) was 20 and 3.2 times higher than that of Ni-MOF and Fe-MOF, respectively, and exhibits excellent CO selectivity (96.4%) and stability. Transmission electron microscopy and atomic force microscopy revealed the two-molecular-layers structure of Ni-MOF and the micro-assembly structure of Fe 3 Ni-MOF, which can shorten the electron transport distance and increase the molecular mass transfer rate. X-ray photoelectron spectroscopy, electron spin resonance and electron density difference calculations reveal that interfacial electric fields and atomic bonds work together to promote directional carrier separation, resulting in the accumulation of holes on Ni-MOF and electrons on Fe-MOF. The Gibbs free energy calculation and in-situ Fourier transformed infrared spectroscopy validate that the micro-assembled S-scheme heterostructures with directional electron transport channels can significantly reduce the activation energy barrier of the reaction. This study not only proves the feasibility of constructing MOFs S-scheme heterostructures using homologous ligands, but also provides a new way to overcome the limitations of monometallic MOFs. This strategy is expected to open up a new avenue to design efficient photocatalysts.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Xinyao Wang,Shaofen Zhao,Wei Shi,Jiangli Sun,Zheming Ni,Shengjie Xia
In this study, WO 3 @NiCr-LDHs Z-scheme heterojunctions have been synthesised for the photodegradation of NOR. A comprehensive investigation was conducted into the effects of the Ni/Cr ratio, catalyst dosage, norfloxacin concentration, temperature and pH of the aqueous environment on the degradation activity of the composites. Furthermore, the stability and reusability of the catalyst after the reaction were discussed. The structural composition and morphological features of the materials were characterised by XRD, SEM and TEM, and the photoelectric properties of the heterojunctions were investigated by photoluminescence spectroscopy and UV–vis diffuse reflectance spectroscopy. The experimental findings demonstrated that a quantity of 15 mg of WO 3 @NiCr-LDHs in conjunction with 50 ml of a 10 mg/L norfloxacin solution in an aqueous environment at a temperature of 20°C and a pH of 7, resulted in 86.01 % of the material being degraded after 120 min of light irradiation. This value was found to be 2.75 and 1.23 times higher than that of WO 3 and LDHs, respectively. Kinetic and thermodynamic analyses indicated that the catalyst amount and temperature were the predominant factors influencing the photodegradation process. The efficient photodegradation is attributable to the built-in electric field produced by the Z-scheme heterojunction, which promotes the separation of photogenerated electron holes, allowing more electrons to be converted into free radicals to work with the holes in the degradation of NOR.
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Processes
·
2025
·Vol. 13
·期 4
·1110
·
IF 2.8
Shikang Zhao,Guohong Chen,Kaiqi Zheng,Shaojie Li,Jiaqi Xu,Fanan Wang,Xueping Liu,Rengui Weng
γ-Valerolactone (GVL) is a promising bio-based platform molecule with significant potential for energy applications. The production of GVL via biomass-based levulinic acid (LA) is an important reaction. To enhance the conversion and selectivity of non-precious-metal catalysts in the LA-to-GVL process and to better understand the key factors influencing this conversion, we conducted a series of experiments. In this study, supported Cu-Ni bimetallic catalysts (Cu-Ni2/Al2O3) were prepared using layered double hydroxides (LDHs) as a precursor. Compared with Cu-Ni catalysts synthesized via the conventional impregnation method, the Cu-Ni2/Al2O3catalysts exhibit higher catalytic activity and stability. The results demonstrated that efficient conversion was achieved with isopropanol as the hydrogen donor solvent, a reaction temperature of 180 °C, and a reaction time of 1 h. The yield of GVL reached nearly 90%, with a decrease of approximately only 6% after six consecutive cycles. The Cu-Ni2/Al2O3catalyst proved to be effective for converting biomass-derived LA to GVL, offering a route that not only reduces production costs and environmental impact but also enables efficient biomass-to-energy conversion.
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ACS Catalysis
·
2025
·
IF 13.1
Zhenwen Yang,Ziyi Shui,Mengfei Zhao,Zheng Wei,Fenglian Zhang,Xiaoxiao Duan,Ben Niu,Bingzhi Li,Guoxia Jiang,Zhengping Hao
Catalytic NH3 decomposition has drawn growing interest in constructing the NH3-based hydrogen economy. Ni catalysts show great potential in this reaction but suffer from low atom utilization efficiency and unclear structure–activity relationship. Here, atomic layer deposition was used to grow Ni clusters on CeO2 nanorods to create a highly active catalyst for NH3 decomposition, which outperforms the conventional Ni nanoparticle catalysts and the synthesized Ni single-atom catalyst. The distinct catalytic behaviors of Ni clusters and Ni single atoms were systematically investigated. It is revealed that the interfacial confinement effect induces a strong electronic interaction between Ni clusters and CeO2, wherein abundant Ov-Ce3+ sites are formed in the vicinity of Ni clusters, resulting in interfacial electron-enriched Niδ− sites. These Niδ− sites bind to N adatoms moderately, favoring N–H bond cleavage and nitrogen desorption (the rate-determining step), which is the origin of the high activity. In contrast, ionic Ni single atoms diffusing into the CeO2 lattice display a much lower activity since strongly bound N adatoms block the active sites and retard the overall rate. This work provides a deep understanding of Ni-catalyzed NH3 decomposition and paves the way for designing high-performance metal catalysts for other structure-sensitive reactions.
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高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Xirui Yan,Haixia Liang,Ruicong Wang,Da Li,Jun Li,Wencai Peng,Jinli Zhang
CO 2 reforming with methane (DRM) is a potential effective carbon neutralization strategy to convert greenhouse gases into syngas. The key to the DRM process is to design active and coking resistant catalysts. Herein, hollow hierarchical bimetallic NiMo-HMgO catalysts were prepared via hydrothermal-impregnation method. The prepared NiMo-HMgO catalysts exhibited higher catalytic performance during the DRM process than commercial NiMo-CMgO catalysts, due to the formation of Ni-Mo-MgO composite on hierarchical MgO (HMgO), which is promoted by exposed (111) polar surface of HMgO with alternate arrangement of anion and cation layers. The deposited carbon and stability can be effectively regulated by adjusting the amount of Ni and the molar ratio of Mo/(Ni+Mo). The synergistic effect of metal and HMgO can provide reference for the research in other related fields.
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Catalysts
·
2017
·Vol. 7
·期 1
·21
·
IF 3.082
Yang Han,Bo Wen,Mingyuan Zhu
In this study, we prepared core-shell structured Ni@SiO2catalysts using chemical precipitation and modified Stöber methods. The obtained Ni@SiO2samples exhibited excellent catalysis performances, including high CO conversion of 99.0% and CH4yield of 89.8%. Moreover, Ni@SiO2exhibited excellent catalytic stability during a 100 h lifetime test, which was superior to that of the Ni/SiO2catalyst. The prepared samples were characterized using a series of techniques, and the results indicated that the catalytic performance for syngas methanation reaction of the Ni@SiO2sample was markedly improved owing to its nanoreactor structure. The strong interaction between the Ni core and the SiO2shell effectively restrained the growth of particles, and the deposition of C species.Keywords:syngas methanation;Ni@SiO2;anti-carbon deposition;catalytic stability
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