INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Zhihao Zhou,Soomro Sarmad,Chao Huang,Guoshu Deng,Zhenkun Sun,Lunbo Duan
Ni-based catalysts supported on ordered mesoporous Al 2 O 3 with 2-D hexagonal and 3-D cubic pore structures are synthesized via evaporation-induced self-assembly for catalyzing dry CH 4 reforming to produce syngas . The Ni–Al 2 O 3 catalysts with 3-D pore structure exhibit higher activity in terms of CH 4 and CO 2 conversions than those with 2-D pore symmetry, due to the better mass transfer of the 3-D interconnected pore structure for the accessibility of Ni 0 active sites. And a higher Ni content slightly promotes catalytic activity , owing to more exposed active sites. However, a higher Ni content causes more severe carbon deposition during long-term reaction. During the long-term stability tests, the catalysts with 2.5 wt% Ni maintain the highest stability regardless of the pore structure, and the catalyst with 3-D pore structure is more advantageous to both activity and stability. Meanwhile, the catalyst with 2.5 wt% Ni and 3-D pore structure shows the lowest carbon deposition.
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高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Fan Zhang,Zhengjun Yao,Zelei Zhang,Xuewei Tao,Wenbo Du
The effect of different deposition potential for electrochemical additive manufacturing prepared the nano-multilayer Ni-Co alloy coating was investigated. The Ni-Co alloy coatings are FCC structures according to XRD analysis . As the potential becomes negative, the weight ratio of Ni in the plating layer increases, and the thickness of the plating layer also increases. Meanwhile, the more negative potential reduces the crystallite size (between 15 nm and 44 nm) and increases the hardness of the Ni-Co coating. The corrosion tested for 3.5 wt% NaCl showed that the thinner multilayer structure will suffer significant penetration corrosion, and the thicker multilayer structure can slow down the penetration corrosion.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Weiji Dai,Yin'an Zhu,Yike Ye,Ye Pan,Tao Lu,Saifang Huang
Surface reconstruction of non-oxide oxygen evolution reaction (OER) electrocatalysts has been intensively studied to improve their catalytic performances. However, further modification of the reconstructed active surfaces for better catalytic performances has not been reported. In this work, NiSe nanorods are prepared on nickel foam (NiSe@NF) as the pre-catalyst for electrochemical OER. It is revealed that non-stoichiometric NiO nanosheets with abundant Ni vacancies (Ni x O) are formed on the surfaces of NiSe nanorods (Ni x O/NiSe@NF) via in-situ electrochemical oxidation. Furthermore, the OER performances are obviously improved after heteroatom Fe is incorporated electrochemically into Ni x O nanosheets ((FeNi)O/NiSe@NF). For OER to have a current density of 20 mA cm −2 in 1 M KOH solution, the as-prepared (FeNi)O/NiSe@NF electrode only needs an overpotential of 268 mV. Density functional theory (DFT) calculations reveal that the formation of Ni vacancy can increase the free energy of *OH. More importantly, the incorporation of heteroatom Fe into Ni vacancy can significantly decrease the free energy of *O, which enables Fe-NiO to have the lowest theoretical overpotential for OER in this work. The present work provides a facile and universal strategy to modify the reconstructed active oxides’ surfaces for higher electrocatalytic performances.
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PubMed
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2021
·Vol. 52
·期 3
·573-581
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IF 2.8
Zhao Ruiyu,Wang Yi Mou,Li Jie,Meng Wenhua,Yang Chunli,Sun Chongxiang,Lan Xuefang
Ni, Ce, and Ta modified Ti/SnO 2 –Sb 2 O 5 –RuO 2 anodes were first prepared by thermal decomposition strategy and applied for Orange G degradation to explore the effect of Ni, Ce, and Ta modification on electrocatalytic property. The Ta modified anode showed the highest ·OH generation capability and the lowest charge transfer resistance among all samples, conducive to electrocatalytic degradation of Orange G. Besides, the Ta modified anode shows more cracks than Ni and Ce modified anodes, which is expected to create more specific surface areas and more exposed active sites for Orange G degradation. The degradation efficiency and the total organic carbon (TOC) removal rate increased in the order Ru < Ru–Ni < Ru–Ce < Ru–Ta, with Ru–Ta showing the highest degradation efficiency of 98.6% and 44.2%, much higher than 79.6% and 27.5% of Ru, respectively.
Graphical abstract
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ENERGY CONVERSION AND MANAGEMENT
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2021
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IF 9.709
Shengnan Yan,Zhenggui Li,Xiaobing Liu,Fang Chen,Wangxu Li,Jie Cheng
Magnetically driven photothermal conversion and energy storage techniques can enhance the energy storage performance of phase change materials (PCMs) and thus have immense potential in energy applications. Paraffin is a common PCM that melts slowly and has poor rate of heat storage capacity. In this study, the effect of a controllable magnetic field on the photothermal and heat storage properties of paraffin was investigated. First, a reduced-graphene-oxide/nickel foam (rGO@Ni foam) composite film with good photothermal ability, corrosion resistance, and oxidation resistance was prepared, and photothermal conversion and energy storage processes under different magnetic fields were experimentally studied. The movement of the composite film could be adjusted by the action of magnetic force, especially to enhance the phase interface movement, accelerate paraffin melting, and improve the photothermal capacity and heat storage characteristics of the material. The composite film and phase interface could be dynamically tuned by regulating the magnetic field, thus enhancing the photothermal conversion effect. In particular, with increasing magnetic field strength, the thermal energy storage efficiency and speed of phase interface movement increased by 29% and 50%, respectively. The proposed magnetic force-driven method will enhance solar energy conversion and promote direct solar energy applications.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Zhiyan Hou,He Meng,Xueqing Shao,Xianglong Wang,M. Usman Tahir,Shakiaz Ahmad,Chao Yang,Xintai Su,Lijuan Zhang
The complex composition and recycling process of electroplating sludge are the two major obstacles restricting the recycling of metal resources. In this work, Ni(HCO 3 ) 2 hollow spheres with unique amorphous structure were prepared via a simple and controllable hydrothermal method using nickel-containing electroplating sludge as raw material and ascorbic acid (AA) as complexing agent . The introduction of AA not only changed the morphology of the sample, but also formed pure phase Ni(HCO 3 ) 2 . The controllable amorphous structure is beneficial to the diffusion of OH - in the electrolyte. More importantly, its disordered atomic arrangement and metastable structure provide a large number of active sites and ion transmission channels, which improve the specific capacity. Consequently, amorphous Ni(HCO 3 ) 2 delivers a large capacitance of 599.8 C g −1 at 1 A g −1 , besides large capacitance, it also exhibits large rate capability (61.02% at a current density of 10 A g −1 ) and cycle performance (capacitance retention 52.09% after 1000 cycles). Importantly, the recoveries of nickel, iron and aluminum are 95.57%, 99.92% and 92.30%, respectively, indicating that electroplating sludge has a good application prospect as electrode materials for supercapacitors .
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Journal of Cleaner Production
·
2023
·
IF 11.1
Hongtao Li,Haitao Yang,Jiaxin Cheng,Qingshan Zhu
Electroless plating is the main method for preparing metal-coated composite powders , such as Ni-coated graphite powders with wide applications in electromagnetic shielding materials, sealing coating, and electrocatalysis. However, the issues of uniform and dense coating during synthesis are hindering its practical implementation. Incorporating noble metals, such as Pd, to activate powders is a typical technique to prepare an electroless Ni coating. However, noble metal utilization is hindered by issues such as high costs and substantial wastewater. Herein, a novel low-cost and eco-friendly activation method based on fluidized bed hydrogen reduction is designed to prepare densely coated Ni@irregular graphite particles (Ni@IGP) using a low Ni content. This method can be used to construct a uniform and dense Ni coating for composite powders without acid alkali treatment and use of precious metals during the overall manufacturing process . Results demonstrated that the Ni@IGP particle obtained through this approach have good electrical conductivity and ferromagnetic properties. In addition, the uniformity and integrity of the Ni plating were adjusted, and the dense coating of graphite at a low Ni content of 35 wt% was effectively achieved. This new activation method sheds light on the field of electroless Ni plating on powders.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Han Sun,Fang Xu,Yongmei Hu,Sui-Jun Liu,Haiping Huang
A series of Pt/Ni-MOF nanocomposites with different atom molar ratio of Pt/Ni were synthesized by the traditional hydrothermal method. Various methods including element mapping, X-ray diffraction (XRD) were employed to characterize the crystal structure and surface morphology of the materials. TEM (Transmission Electron Microscopy) confirms that the Pt nanoparticles are highly dispersed onto the Ni-MOF nanosheet surface, which can provide an abundance of active sites for efficient oxidation of methanol. Electrochemical measurements showed that Catalyst b (the atomic molar ratio of Pt to Ni is 2:1 in the precursor materials) exhibited a higher oxidation current density in MOR and larger electrochemically active surface area (ECSA) than other catalysts with different atomic ratios and commercial Pt/C. Meanwhile, the synthesized catalysts showed long-term activity and good resistance to toxicity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Man Zhao,Rong Zhang,Zimei Fu,He Xiao,Meng Bai,Li Zhang,Junming Zhang,Jianfeng Jia,Nianjun Yang
Sluggish reaction kinetic and large overpotential of the oxygen evolution reaction (OER) result in low energy efficiencies of different OER related devices. To solve these challenges, an OER electrocatalyst is constructed by coupling black phosphorus with Co/Ni nanosheets during a facile electrolysis-solvothermal process, where the bulky BP is successfully exfoliated into BP sheets (BP NSs) and the Co or Ni precursors are generated via anodic oxidation . Then, BP sheets are combined with Co–Ni species and finally formed into Co–Ni/BP composite via subsequent solvothermal process. The OER tests on this composite show the overpotential is 292 mV at 10 mA cm −2 , much lower than that (341 mV) on a RuO 2 catalyst. The TOF value of this composite is 0.71 s −1 at 1.8 V ( vs . RHE), 14.2 times higher than that of Co/BP (0.05 s −1 ) and 23.7 times higher than Ni/BP (0.03 s −1 ). Operando structure characterizations of this composite reveal that Co 2+ -Ni 2+ dual-sites are formed on Co–Ni/BP and electrons are transferred from Ni to Co via a P bridge. These Co 2+ -Ni 2+ dual-sites evolve into Co 3+ -Ni 3+ dual-sites during the OER, where Ni 2 P is formed into NiOOH and CoP turns into Co 3 O 4 . The Ni-P x -Co bridge is finally transformed into a heterogeneous Co 3 O 4 /NiOOH structure. This heterostructure efficiently regulates electronic structure of Co and Ni sites, resulting in the favorable adsorption of OH*, conversion of rate-determining step, reduced activation energy of the whole reaction, and eventually enhanced intrinsic activity toward the OER. This work provides a guidance to explore operando reconstruction mechanism of black phosphorus based electrocatalysts during electrocatalytic reactions .
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Tan Dang,Lei Wang,Donghai Wei,Guiqing Zhang,Qinggang Li,Xiaojia Zhang,Zuoying Cao,Guanhua Zhang,Huigao Duan
Low-cost and resourceful transition metal phosphides (TMPs), as a new kind of pseudocapacitive materials, have received considerable interest for electrochemical energy storage/conversion. Combination of TMPs and carbon nanostructures is supposed to greatly improve the charge storage capability due to the synergistic effect. In this work, nickel cobalt phosphides nanosheets supported by P doped C spheres (P-CSs@Ni-Co-P NSs) composites with different Ni/Co molar ratios (1:0, 1:1, 1:2, 1:4 and 0:1) were prepared by in-situ bifunctional phosphorization of the as-synthesized CSs@Ni-Co-OH NSs precursor. The optimized 3D networked mesoporous P-CSs@Ni 1 -Co 2 -P NSs electrode exhibits a remarkable specific capacitance of 1040.3 F g −1 at 1 A g −1 and excellent rate capability with a capacitance retention of 49.2% even at 30 A g −1 , which are much higher than those of A-CSs@Ni 1 -Co 2 -O NSs (870.5 F g −1 at 1 A g −1 , 37.4% at 30 A g −1 ) and Ni 1 -Co 2 -P NSs (500.5 F g −1 at 1 A g −1 , 40.0% at 30 A g −1 ). The improved supercapacitive performances are attributed to the 3D mesoporous nanosheets network and bifunctional phosphorization treatment which lead to enhancement of conductivity. Meanwhile, Ni-Co bimetallic phosphide with abundant oxidation states facilitates redox charge transfer efficiently. Furthermore, P-CSs@Ni 1 -Co 2 -P NSs assembled asymmetric supercapacitors (ASC) achieve outstanding cycling stability with no decay of capacitance after 20000 cycles. Additionally, the charge storage kinetic of the device is further investigated, indicating that fast surface-control capacitive behavior is dominant at high current densities.
研究领域:
材料科学
·
电化学
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高影响因子
RARE METALS
·
2023
·Vol. 43
·期 1
·148-163
·
IF 8.8
Xu Zhi-Hui,Sun Shi-Shuai,Li Xue-Lei,Zhang Zhi-Hui,Li Hai-Ying,Ruan Shuang-Ting,Yin Shou-Gen
The balancing of the electrochemical performance, mechanical stability, and processing technology for applying supercapacitors to flexible and wearable electronics continues to encounter severe challenges. Herein, we prepare Ni–Co–Mn hydroxide electrodes with a three-dimensional multichannel structure via a simple hydrothermal method. These are constructed using vertically contiguous nanosheets with a uniform thickness and rough surface. The electrodes can provide numerous electroactive sites and accelerate the transmission of electrolyte ions. The relationship between the structure and electrochemical performances is verified by experiments and theoretical calculations. Two-dimensional (2D) planar and one-dimensional (1D) fiber electrodes are prepared using a flexible carbon cloth (CC) and carbon fiber (CF), respectively, as substrates. The assembled quasi-solid-state flexible asymmetric supercapacitor (FASC) with a two-dimensional sandwich structure using NiCoMn–OH/CC as the electrode achieves a remarkable energy density of 73.8 Wh·kg −1 at a power density of 1.03 kW·kg −1 . The quasi-solid–state FASC with a 1D linear structure using NiCoMn–OH/CF as the electrode also attains a high energy density (12.9 Wh·kg −1 at a power density of 0.75 W·kg −1 ). Moreover, the electrochemical performances of the NiCoMn/CC//AC/CC and NiCoMn/CF//AC/CF FASCs are not disturbed at different bending angles (0°, 45°, 90°, 135° and 180°). This indicates the superior flexibility of the devices. We also assemble a self-powered energy-harvesting storage system by integrating FASCs and commercial solar cells to verify its practicability. It displays sustainable development potential for energy storage. Graphical abstract
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高影响因子
Processes
·
2023
·Vol. 11
·期 11
·3181
·
IF 3.5
Chuangchuang Yang,Qiaoling Dai,Anpeng Hu,Hui Yuan,Qinghe Yang
In this present work, a new kind of sulfurized hydrodesulfurization catalyst was synthesized via the hydrothermal treatment of MoS2, NiCO3·2Ni(OH)2·4H2O, and Al2O3precursors, followed by annealing under a H2atmosphere, which does not require a sulfurization process compared to traditional preparation methods. The influence of the annealing temperature and the type of Al2O3precursor on the interactions between MoS2and Al2O3were studied using X-ray fluorescence spectroscopy, X-ray diffraction, N2adsorption–desorption, Raman spectroscopy, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. The results indicated an increase in the number of stacked layers of the MoS2catalyst, accompanied by a decrease in the degree of decoration of Ni atoms onto MoS2nanoslabs, as a result of the strengthened MoS2–Al2O3interaction. Subsequently, the efficiency of hydrodesulfurization (HDS) was evaluated using dibenzothiophene as a representative reactant, while establishing a correlation between the structure of the catalyst and its performance. The catalysts, using pseudo-boehmite as the precursor and calcined at 500 °C, synthesized by calcining pseudo-boehmite as the precursor for Al2O3at a temperature of 500 °C and possessing suitable metal–support interactions, exhibited a reduced number of MoS2stacking layers and lateral dimensions, along with an optimal decoration degree of Ni atoms, thereby resulting in the highest level of HDS activity.
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