JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Wei Xia,Gui-Zhi Guo,Xue-Qian Wu,Ya-Meng Yin,Ya-Pan Wu,Shuang Li,Ruan Chi,Dong-Sheng Li
Direct methanol fuel cells (DMFCs) can permit the utilization of noble-metal-free electrocatalysts , which certainly reduces the cost and accelerates their practical implementation. With the exploration of efficient and economical methanol oxidation reaction (MOR) catalysts, Ni-based nanostructures have been recognized as the most promising MOR catalysts in alkaline media. Herein, we construct a novel heterojunction MOR electrocatalyst composed of Ni-based metal-organic framework (Ni-MOF) and NiFe-based layered double hydroxides (LDHs) through a coordination-induced self-assembly strategy. Owing to the synergic effect between Ni and Fe sites, coupled with the effect of hetero-interface, the resultant Ni-MOF/NiFe-LDH composite exhibits remarkable MOR activity in 0.1 M KOH electrolyte with the oxidation current density (32.66 mA cm −2 ) is 2.65 and 2.44 times higher than that of the primitive NiFe-LDH and Ni-MOF. The excellent stability of the Ni-MOF/NiFe-LDH electrocatalyst has also been confirmed by long-term chronoamperometry (CA) analysis. Our work paves a facile controllable way for fabricating MOF/LDH heterostructure targets on MOR and underlines its potential to boost energy conversion efficiency through the manipulation of synergic components.
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Materials Chemistry Frontiers
·
2024
·
IF 6
Xin Fu,Bo Pu,Li Pan,Ruiqi Ming,Qian Lv,Xiaobo Chen,Lihong Tian
Urea oxidation reaction (UOR) is a promising substitution for the oxygen evolution reaction (OER) on anode for highly efficient H2 production. However, the sluggish kinetics and high oxidation potential of NiII → NiIII severely limit the activity of Ni-based catalysts in the electrochemical UOR. Herein, composition regulation was adopted to enhance the electrocatalytic activity of a nickel-benzene dicarboxylate framework (Ni-BDC MOF)-derived electrode towards urea oxidation. In 1 M KOH with 0.33 M urea solution, the derived amorphous tri-metallic hydroxide layer on the surface of the NiMnCo MOF, induced by electro-activation, exhibited a low onset potential and a steeply rising current density with increasing applied potential. It achieved a benchmark current density of 10/100 mA cm−2 at an anode potential of 1.28/1.33 V vs. RHE, respectively. In particular, a 500 mA cm−2 current density was reached at an impressively low potential of 1.41 V vs. RHE. This exceptional performance is ascribed to the fact that the open framework provides a large electrochemical active surface, while the multicomponent synergy decreases the NiII → NiIII oxidation potential, enhances electron transfer and promotes the UOR kinetics. This study suggests that rational composition regulation is a promising approach to improving the performance of Ni-based MOF materials towards electrocatalytic urea oxidation.
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Journal of Energy Storage
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2024
·
IF 8.9
Yiping Qiu,Xingyue Wu,Denghui Tang,Junyao Li,Wenrong Cai,Laidi Xu,Yong Kong,Zheng-Zhi Yin
A Prussian blue analogue is grown in situ on nickel foam (NF) by a co-precipitation strategy, which is further converted into Ni-Co tellurides ((Ni-Co)Te)/NiTe through a hydrothermal method. The obtained (Ni-Co)Te/NiTe shows a heterogeneous and multi-dimensional structure, which displays a high areal specific capacitance of 2390.7 mF cm −2 at 1 mA cm −2 and a high capacitance retention of 80.3 % after 5000 cycles. Further, a hybrid supercapacitor (HSC) is assembled by using the (Ni-Co)Te/NiTe grown on NF (NF@(Ni-Co)Te/NiTe) as the cathode and activated carbon (AC) supported on NF (NF@AC) as the anode, respectively. The HSC exhibits a maximum energy density of 95.6 Wh kg −1 at the power density of 444.5 W kg −1 , which is higher than most of the HSCs previously reported. The synergistic effect of the heterojunction in the (Ni-Co)Te/NiTe and its multi-dimensional structure plays a crucial role in the enhanced reaction kinetics of the HSC.
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SURFACE & COATINGS TECHNOLOGY
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2024
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IF 5.3
Zhijie Jing,Peng Xu,Ling Wang,Rou Liang,Chi Pang
In this work, ultrasonic-assisted laser cladding technology was employed to fabricate shape memory alloy (SMA) coatings composed of Fe-Mn-Si-Cr-Ni on the surface of 304 stainless steel. Both experimental and simulated results unequivocally demonstrate a substantial improvement in both microhardness and wear resistance of the metal surface. Subsequently, a superhydrophobic coating with an “armor-like” structure was comprehensively prepared by integrating femtosecond laser (FSL) and nano SiO 2 spray-coating techniques. The creation of this microstructure on the coating surface efficiently facilitated the high-efficiency embedding of nano SiO 2 particles. Notably, the modified SMA coating exhibited stable superhydrophobic properties and exceptional corrosion resistance. This research not only provides novel approaches and methods for the preparation and modification of Fe-based memory alloy coatings but also highlights potential applications in the corrosion-resistant field. The work offers valuable insights for researchers in the field of materials science, emphasizing the synergistic effects of ultrasound-assisted laser cladding technology, femtosecond laser, and nano SiO 2 spraying techniques. It provides robust support for the development of new functional coatings.
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RSC Advances
·
2024
·Vol. 14
·期 12
·8100-8107
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IF 3.9
Yu Hua,Xiaomeng Zhang,Fulin Chen,Yuantao Sun,Xinyu Wang,Ziliang Wen,Qinghao Tan,Chenxi Sun,Buhe Bateer
In this study, we utilized a simple calcination method to prepare a Ni/TiO2/C composite, which was synchronously grown from magnetic, semiconductor, and conductive materials. XRD, SEM, Raman, and XPS characterization methods were used to analyze the crystal structure, graphitization degree, morphology size, and valence state of Ni/TiO2/C, and its electromagnetic wave absorption performance was tested. It was revealed that rod-like Ni/TiO2/C had good electromagnetic wave absorption performance at a thickness of 1–5.5 mm; in particular, its reflectance reached −40 dB at 3.5 mm and its absorption bandwidth (reflectivity < −10 dB) reached 4.4 GHz (6.0–10.4 GHz) at a thickness of 4.0 mm. It was thus revealed that its electromagnetic wave absorption rate and absorption bandwidth can be regulated by its thickness. Compared with Ni/TiO2, it was proven that the conductive materials (carbon), magnetic materials (Ni), and semiconductor materials (TiO2) in the rod-like Ni/TiO2/C composite can synergistically absorb electromagnetic wave energy through dielectric and magnetic losses.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Yuzhen Zhang,Huajun Zhou,Peihua Zhao,Kai Yuan,Rui Zhou,Yongping Qu,Yanzhong Wang
The oxygen evolution reaction (OER) is a complex four-electron transfer process that poses a significant challenge to the efficient production of hydrogen through water splitting. However, developing non-noble metal electrocatalyst with excellent OER performance is still a big challenge. Herein, we propose a new strategy for the in-situ growth of two-dimensional amorphous/crystalline thiophene-based Ni-Fe metal–organic frameworks (MOFs) using Ni-Fe foam (NFF) as metal source and current collector, and thiophene-2,5-dicarboxylic acid (TDC) as corrosion agent and ligand. TDC was ionized at high temperature to produce H + ions that etch NFF to release Ni 2+ and Fe 2+ ions, which were coordinated with TDC to in situ synthesize two-dimensional Ni-Fe thiophenedicarboxylate coordination polymer (NiFe-TDC) nanobelts on NFF. The unique structure and synergistic effect of Ni and Fe ions of NiFe-TDC 0.05 result in the excellent OER performance with an overpotential of 224 and 256 mV at current densities of 10 and 100 mA cm −2 , respectively, and it can run stably for 100 h at a current density of 100 mA cm −2 , indicating the outstanding stability. Furthermore, NiFe-TDC 0.05 remains the excellent OER performance with an extremely low potential of 196 and 271 mV at current densities of 10 and 100 mA cm −2 in seawater with 1 mol L -1 (M) KOH, respectively. The assembled NiFe-TDC 0.05 || Pt/C water electrolysis cell achieves a current density of 100 mA cm −2 at a low voltage of 1.78 V. The work provides a new method to prepare two dimensional MOFs for efficient water oxidation.
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Chemical Engineering and Processing-Process Intensification
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2025
·
IF 3.9
Shichao Su,Yaqiao Tian,Huifeng Li,Weiyao Yang,Hongda Zhang,Feng Liu,Le Sang
The micropacked bed reactor (μPBR) with monolithic catalyst hydrogenation technology has received widespread attention due to its high efficiency, continuous operation, and safety. In this study, the Pd/PDA/foam catalyst was prepared via impregnation method and vanillin (VL) hydrogenation was investigated in green water solution based on the μPBRs. The effect of operating temperature, pressure, the number of foam catalyst block, VL concentration, liquid and H 2 flow rate on VL conversion and VA yield was discussed. The highest conversion of VL was 99.4% and product yield of vanillyl alcohol (VA) reached 84.9% with 2.8 MPa, 120°C, 22 blocks of Pd/PDA/Ni foam catalyst, H 2 flow rate of 10 mL·min −1 and liquid flow rate of 0.1 mL·min −1 , and short reaction time (0.106 h) in μPBRs. The kinetic of hydrogenation VL to VA was established. The reaction rate constant and activation energy in μPBRs were from 0.63 to 1.39 min −1 and 16.94 kJ·mol −1 . The STY of VA in μPBRs was 0.0824 kg·L −1 ·h −1 ·g −1 , which was bigger than that of batch hydrogenation devices.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Yuhui Xue,Jingjing Wang,Meng Wang,Jiang Li,Kefu Wang,Afaq Hassan,Changyan Guo,Jide Wang
The efficient removal of antibiotic residues from aqueous solution is very important for water security. Studies have found that adsorption is widely used for the removal of antibiotics due to its cost-effectiveness, low energy consumption, simplicity of operation, and environmental friendliness. In this study, a novel magnetic porous carbon adsorbent (Ni-MPC-400) with a high adsorption capacity and saturation magnetization was synthesized via direct carbonization of Ni-MOF at 400 °C pyrolysis temperature and used to efficiently remove tetracycline from an aqueous solution. Adsorption experiments showed that Ni-MPC-400 exhibited excellent tetracycline adsorption capacity (441.51 mg·g–1) from the aqueous solution. Possible adsorption mechanisms were proposed through characterization and analysis. The adsorption mechanisms mainly involved π–π interactions, hydrogen bonding, metal–organic complexation, and pore filling effects. In addition, Ni-MPC-400 showed rapid and sufficient adsorption at a low concentration of tetracycline (5 mg·L–1) and good adsorption performance over a wide pH range. In addition, the material has been tested to have good immunity to interference and regenerative capacity, demonstrating a potential application in the removal of tetracycline contaminants from aqueous solutions.
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MOLECULES
·
2025
·Vol. 30
·期 1
·177
·
IF 4.6
Zhi Lu,Yifan Guo,Shilin Li,Jiaqi Ding,Yingzi Ren,Kun Tang,Jiefeng Wang,Chengxin Li,Zishuo Shi,Ziqi Sun,Hongbo Meng,Guangxin Wang
Water electrolysis is a promising path to the industrialization development of hydrogen energy. The exploitation of high-efficiency and inexpensive catalysts become important to the mass use of water decomposition. Ni-based nanomaterials have exhibited great potential for the catalysis of water splitting, which have attracted the attention of researchers around the world. Here, we prepared a novel Mo-doped NiFe-based layered double hydroxide (LDH) with a nanoarray microstructure on Ni foam. The doping amount of Mo can significantly change the microstructure of the electrocatalysis, which will further affect the oxygen evolution reaction (OER) performance of water splitting. This novel nanomaterial required only an overpotential of 227 mV for 10 mA cm−2and a Tafel slope of 54.8 mV/dec in 1 M KOH. Meanwhile, there was no Mo, and the NiFe-LDH needed 233 mV to attain to 10 mA cm−2. Compared to the NiFe-LDH without Mo, the NiFeMo-LDH nanosheet arrays exhibited enhanced activities with 17.1 mV/dec less Tafel in OER. The good performance of the electrocatalyst is ascribed to the special nanosheet arrays and the heterostructure of the Ni-Fe-Mo system. These features help to increase the active surface, enhancing the efficient charge transfer and the reactive activity in OER.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Qi Cao,Yucheng Shen,Jixing Bai,Qingyu Liu,Zhenzhen Zhao,Tingzhou Lei,Abdelghaffar S. Dhmees,Huiyan Zhang
Synthesizing high performance and affordable nickel-based electrocatalysts has been one of the research hotspots in the field of clean energy conversion. Herein, facile electroless plating accompanied with mild impregnation method is explored to synthesize petal-like Ni(OH) 2 flakes on carbon cloth (CC) for electrocatalytic alkaline hydrogen evolution reaction (HER). Notably, the optimal Ni(OH) 2 /CC electrode has outstanding HER activity requiring only 24.6 mV vs . RHE of overpotential to reach 25 mA cm −2 of current density, and only 101.5 mV vs . RHE of overpotential to reach 100 mA cm −2 . Meanwhile, the 25-h stability test results performed well. This is primarily due to its plentiful interfacial contact, favorable surface morphology of ultrathin and dense nanosheets array, and rapid electron transport . Overall, this study provides a viable approach for the development of efficient, low-cost, hydrophilic nickel-based catalysts for electrocatalytic water splitting applications.
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ChemistrySelect
·
2024
·Vol. 9
·期 8
·e202303088
·
IF 1.9
Xiayan Zhang,Zhi Song,Boxia Liu,Jialu Liu,Yeqiong Huang,Dongxu Han
Graphical Ni/Fe bimetallic atom cluster catalyst is prepared by a hydrothermal to stimulate PMS to produce high concentration 1 O 2 and efficiently remove BPA from aqueous solution. It is found that 1 O 2 in the system is the most important active component in the degradation process of BPA, and a high concentration of 1 O 2 could promote the rapid degradation of BPA in solution. The advanced oxidation process based on peroxymonosulfate (PMS) is a new water purification strategy. In this work, Ni/Fe bimetallic atom cluster composite catalyst is prepared by a hydrothermal synthesis to stimulate PMS to produce high concentration singlet oxygen ( 1 O 2 ) and efficiently remove bisphenol A (BPA) from aqueous solution. The experimental data show that in a broad pH range (pH=3–11), the removal rate of BPA by the non-free radical pathway induced by 1 O 2 is close to 100 %, and the catalyst still has high stability after 5 cycles. The mechanism of BPA removal in NiFe−BC/PMS/BPA catalytic degradation system is investigated by quenching experiment. It is found that 1 O 2 in the system is the most important active component in the degradation process of BPA, and a high concentration of 1 O 2 could promote the rapid degradation of BPA in solution. In this paper, the high catalytic activity and selectivity of bimetallic atomic cluster catalysts can provide new insights for the treatment of phenolic wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yunzhu Wang,Yang Chen,Songshan Zhu,Di Song,Tianhao Ai,Sufang He,Yongming Luo
Steam reforming of glycerol (GSR) to produce hydrogen has been considered a sustainable and low-cost route for hydrogen production. The selection of a suitable catalyst support is crucial for achieving efficient hydrogen production at lower temperatures. CeO 2 has been widely used in heterogeneous catalysis and exhibits excellent low-temperature catalytic performance. However, different calcination mode may influence catalyst performance. In this study, the Ni/CeO 2 catalyst prepared by rapid calcination mode (Ni/CeO 2 -RC), was used for hydrogen production from GSR, and the Ni/CeO 2 catalyst with the conventional programmed-heating calcination method (Ni/CeO 2 -PC) was applied for comparison. The effect of different calcination modes on the physico-chemical properties of the catalysts was investigated through multiple characterizations such as N 2 adsorption-desorption, X-ray diffraction, hydrogen temperature programmed reduction, transmission electron microscopy, X-ray photoelectron spectroscopy, H 2 chemisorption, CO-oxygen storage capacity and conversion, temperature programmed oxidation, and Raman spectroscopy. The rapid calcination mode promoted stronger metal-support interactions in Ni/CeO 2 -RC, inducing the formation of nickel species highly susceptible to reduction due to the electronic effect. Additionally, rapid calcination facilitated the increased incorporation of nickel particles into the cerium dioxide lattice, leading to lattice distortions, thereby contributing to the formation of more oxygen vacancies. The abundant oxygen vacancies promoted the activation of water, thus realizing the high H 2 selectivity of Ni/CeO 2 -RC. Moreover, the strong oxygen storage-release ability of Ni/CeO 2 -RC facilitated the oxidative effect of carbon deposition and the strong Ni–CeO 2 interaction effectively inhibit sintering of nickel nanoparticles on Ni/CeO 2 -RC. Therefore, Ni/CeO 2 -RC exhibited outstanding catalytic stability, remaining active for 35 h without deactivation, whereas Ni/CeO 2 -PC rapidly deactivated after 25 h of reaction.
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