Journal of Materials Research and Technology-JMR&T
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2021
·
IF 5.039
Hui Jin,Renjie Ji,Tiancong Dong,Shuo Liu,Fan Zhang,Lilong Zhao,Chi Ma,Baoping Cai,Yonghong Liu
Nickel-iron alloy is broadly utilized in the industrial field due to its fabulous mechanical properties. How to prepare nickel-iron alloy with better corrosion resistance more efficiently is an important concern. Based on this, the WC particles enhanced nickel-iron coatings were fabricated by jet electrodeposition (JED) at a high current density of 100A/dm 2 . It was found that increasing the deposition temperature appropriately during JED is beneficial to obtain Ni-Fe-WC coating with the higher number of hard particles. Specifically, the maximum WC particles proportion reaches 4.47 wt% at 55 °C. The electrochemical corrosion behavior of coating was measured by polarization curve and electrochemical impedance spectroscopy (EIS). The polarization curve test results displayed that the E corr positively shifted from −0.402 to −0.281 V and the i corr reduced from 25.13 to 7.05 μA/cm 2 with the increase of WC particles proportion. Meanwhile, the EIS test results exhibited that the impedance of coating enhanced from 12,720 to 59,140 Ω cm 2 . The neutral salt spray test (NSS) was used to simulate the corrosion of coating in a seawater environment. The NSS results showed that with the increase of WC particles, the corrosion products decreased gradually and the degree of corrosion decreased. The analysis showed that WC particles can help the grain growth and release the internal stress in the coating. Larger grain sizes reduces intergranular corrosion and smaller internal stress help to alleviate stress corrosion cracking. The above research can provide theoretical support for the efficient preparation of particle enhanced composite coating with strong corrosion resistance.
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Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 11
·6122-6128
·
IF 12.732
Wenxiu Ma,Zhe Chen,Jun Bu,Zhenpeng Liu,Jinjin Li,Chen Yan,Lin Cheng,Lei Zhang,Hepeng Zhang,Jichao Zhang,Tao Wang,Jian Zhang
In pursuit of environmental friendliness and high economic efficiency, renewable energy-driven selective acetylene semihydrogenation under ambient conditions is urgently required but remains a grand challenge. Herein, we explore single-atom nickel (Ni) dispersed N-doped carbon (SA-Ni-NC) as a novel electrocatalyst for catalyzing selective acetylene semihydrogenation. In situ electrochemical Raman and theoretical investigations reveal that weak π-adsorption of ethylene on individual Ni sites in SA-Ni-NC facilitates its desorption and thus avoids its overhydrogenation. Eventually, under pure acetylene flow, SA-Ni-NC exhibits a high ethylene faradaic efficiency (FEethylene) of 91.3% and a large current density of −92.2 mA cm−2 at −0.6 V vs. the reversible hydrogen electrode (RHE). Even in crude ethylene stream containing 1% acetylene impurities (1 × 104 ppm), SA-Ni-NC still manifests a high acetylene conversion of 97.4% with a large space velocity (SV) of 2.4 × 104 mL gcat−1 h−1 and a high turnover frequency (TOF) of 22.9 h−1 for each Ni atom.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yang Qi Huang,Tao Zhou,Asad Ali,Pei Kang Shen
Exploring cost-effective, high-efficiency and stable electrocatalysts for overall water splitting is greatly desirable and challenging for sustainable energy. Herein, a novel designed Ni activated molybdenum carbide nanoparticle loaded on stereotaxically-constructed graphene (SCG) using two steps facile strategy (hydrothermal and carbonization) as a bifunctional electrocatalyst for overall water splitting. The optimized Ni/Mo 2 C(1:20)-SCG composites exhibit excellent performance with a low overpotential of 150 mV and 330 mV for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively to obtain a current density of 10 mA cm −2 in 1.0 M KOH solution. In addition, when the optimized Ni/Mo 2 C(1:20)-SCG composite is used as a bifunctional electrode for overall water splitting, the electrochemical cell required a low cell voltage of 1.68 V at a current density of 10 mA cm −2 and long-term stability of 24 h. More significantly, the synergetic effects between Ni-activated Mo 2 C nanoparticles and SCG are regarded as a significant contributor to accelerate charge transfer and promote electrocatalytic performance in hybrid electrocatalysts. Our works introduce a novel approach to design advanced bifunctional electrodes for overall water splitting.
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LANGMUIR
·
2023
·
IF 3.9
Huawen Zhu,Zhilin Cheng
The collaborative lubrication effect based on different lubricating nanostructures could not only overcome the respective drawbacks of different nanostructures as nanoadditives but also comprehensively improve friction performance. For this, we first developed a novel collaborative lubrication nanostructure based on Ag nanowires (NWs) and two-dimensional (2D) Ni-BDC nanosheets (Ag NWs/2D Ni-BDC) by the in situ chemical reduction strategy. The structural characterizations corroborated that Ag NWs with a width of approximately 20–30 nm grew on the surface of 2D Ni-BDC nanosheets, which presented the chemical interface between both. As the nanoadditive applied in oils, the tribological finding confirmed that the Ag NWs/2D Ni-BDC enabled the friction coefficient and wear scar diameter to reduce by 38 and 37% at 0.04 wt % additive content, respectively. The worn surface was characterized by a series of analytical techniques, which basically revealed the friction-reducing and antiwear mechanism based on the layered structure and self-repair effect. Consequently, the nanocomposite structure incorporating the nanowire and 2D nanosheets should be taken into account as a new potential lubricating material.
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高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Jiatai Wang,Siyu Dong,Yan Wang,Chengting Du,Dongming Chen,Cairang Zhouxian,Meng Li,Zhifeng Yan,Xingyu Zhao,Mingzhi Xiang,Cheng Qing
Nickel-rich layered ternary cathode materials have attracted extensive attention due to the high specific capacity and excellent cost-effectiveness. However, severe issues including irreversible phase transitions and progressive lattice expansion are observed during cycling. These issues lead to rapid capacity fading and limited cycling lifespan, severely restricting their large-scale commercial application. In this study, high-valent tantalum (Ta 5+ ) was employed as a dopant to simultaneously enhance Li + diffusion kinetics and structural stability. The Ta 5+ -doped LiNi 0.9 Co 0.05 Mn 0.05 O 2 cathode material was successfully synthesized via a combination of uniform co-precipitation and high-temperature solid-state methods. The results demonstrate that Ta 5+ doping can effectively suppress irreversible phase transitions and lattice distortion during cycling, thus improving the reversible specific discharge capacity and capacity retention. Electrochemical measurements indicate that the 0.3%Ta-NCM exhibits the outstanding performance. The specific discharge capacity of 219.32 mAh/g is obtained for the 0.3%Ta-NCM at 0.1C, which is 24.83 mAh/g higher than that of the NCM (194.49 mAh/g). The 0.3%Ta-NCM delivers a capacity retention of 89.35% after 100 cycles at 0.2C, which is significantly higher than the 85.97% of the pristine NCM. The retention rate surpasses that of the pristine NCM (66.74%) by 23.52% after 100 cycles at 1C. This work provides a feasible modification strategy for the structural regulation and performance optimization of nickel-rich ternary cathode materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Ling-Xin Kong,Yi Fang,Meng-Meng Wang,Hui-Hao Li,Shan Huang,Ji-Sen Li,Qi Xiao
Industrial-scale hydrogen energy deployment requires the design of highly efficient catalysts with low overpotential and excellent stability, particularly at high current densities. We report a novel method for fabricating an N-doped carbon coated self-supporting Ni-NiWO 4 heterojunction on a nickel foam (NF) catalyst (Ni-NiWO 4 @NC/NF) using a facile combination of hydrothermal and chemical vapor deposition techniques. The Ni-NiWO 4 @NC's plentiful catalytic active sites and their seamless contact with NF, along with the synergistic coupling of N-doped carbon, contribute to a decrease in charge transfer resistance and an improvement in catalyst stability. Impressively, when evaluated as an electrocatalyst in alkaline media, the overpotentials of Ni-NiWO 4 @NC/NF at a current density of 100 mA·cm −2 are only 125.6 mV for hydrogen evolution reaction (HER), and 308.8 mV for oxygen evolution reaction (OER), respectively. The catalyst also demonstrates exceptional stability for HER, OER, and water splitting at high current densities. In addition, the two-electrode electrolyzer using Ni-NiWO 4 @NC/NF as both cathode and anode need a cell voltage of 1.72 V to deliver 100 mA·cm −2 . These findings offer valuable insights into the design and advancement of self-supported non-noble transition metal electrocatalysts for large-scale hydrogen production in industrial applications.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ruo-Ding Mao,Xing Zhang,Yi-Lei Li,Mu Lan,Wen-Ning Ren,Sheng-Jiang Huang,Xin Chang,Bing-Jie Wang,Yan Jiao,Le-Zhong Li,Xiao-Hui Wu
A solid-phase synthesis method was utilized to create a range of ferrite samples, specifically Sr 1- x Dy x Fe 12- x Ni x O 19 , where x values varied (0, 0.01, 0.02, 0.03, and 0.05). Through X-ray diffraction (XRD) analysis, it was found that up to x ≤ 0.03, the XRD pattern showed no discernible impurity phases. However, at x = 0.05, an observable impurity peak attributed to α-Fe 2 O 3 emerged. Room temperature hysteresis loop measurements revealed consistent hard magnetic behavior across all samples. Notably, changes in coercive force directly correlated with magnetocrystalline anisotropy. As substitution increased, the initial saturation magnetization ( M S ) of 59.68 emu/g (at x = 0.00) moderately reduced to 57.79 emu/g (at x = 0.05), representing a modest decline of 3.17 %. A clear trend was observed: decreasing grain size led to diminishing dielectric constants. Moreover, a strong link between the Nyquist diagram's semicircle diameter and sample resistivity was evident, showing distinctive metal-semiconductor behavior. These findings shed light on the structural and magnetic characteristics of Dy and Ni co-substituted SrFe 12 O 19 ferrites, suggesting potential for enhanced performance in advanced magnetic and electronic devices. This study significantly contributes to the field of ferrite materials, deepening our insights and paving the way for innovative applications in diverse technological domains.
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Catalysts
·
2023
·Vol. 13
·期 12
·1474
·
IF 3.9
Yuhang Cai,Anping Yin,Jianxiang Zhang,Jiatai Wang,Xiaofei Qin,Yibo Yang,Gaolei Qin,Xiaodong Sun,Peng He,Yong Yang
This study focuses on the synthesis and evaluation of carbon−coated Ni−Fe alloy catalysts (NiFex@C, x = 0, 0.3, 0.7, 1.1) for the hydrogenation of cinnamaldehyde. The catalysts were characterized using Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Raman spectroscopy, and X-ray Photoelectron Spectroscopy (XPS). The introduction of Fe was found to increase the average particle size of the bimetallic catalysts compared to the monometallic Ni@C. Ni existed in both metallic and oxide states, while Fe exhibited multiple oxidation states in the bimetallic catalysts. The carbon layer, approximately 2–3 nm thick, was confirmed to envelop the alloy particles. The catalytic performance of carbon−coated Ni−Fe alloy catalysts indicated that the addition of Fe to Ni@C enhanced the selectivity towards hydrocinnamaldehyde (HCAL), with NiFe0.7@C showing the highest selectivity (~88.6%) but at a reduced conversion rate. The carbon layer played a pivotal role in the stability and reusability of the catalysts. NiFe0.7@C maintained consistent performance over multiple reaction cycles, while NiFe0.7NPs (without a carbon layer) exhibited significant deactivation. Both catalysts displayed strong magnetism, facilitating easy separation from the reaction mixture. This study sheds light on the significance of the carbon layer in bimetallic catalysts and provides valuable insights for designing efficient catalysts for hydrogenation processes.Keywords:cinnamaldehyde hydrogenation;bimetallic catalysts;carbon−coated nanoparticles;Ni−Fe alloy;catalyst reusability
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ChemSusChem
·
2023
·
IF 8.4
Pu Zhang,Haihua Zeng,Decai Wen,Xiaoyu Sui,Zhuan Wang,Ying Wang,Hailong Chen,Yuxiang Weng,Jinlin Long
Graphical With the combination of surface organometallic chemistry and post-synthetic ligand exchange or calcination, the coordination environments of Ni sites were precisely manipulated to achieve a splendid improvement in hydrogen evolution reaction (HER) under visible-light irradiation. Thereinto, the 2,2′-bipyridine bonded Ni catalyst showed the optimum HER ability, 260 folds as Ni without ligand and 2.5 folds as 2-phenylpyridine bonded Ni catalyst. Solar hydrogen production at a high efficiency holds the significant importance in the age of energy crisis, while the micro-environment manipulation of active sites on photocatalysts plays a profound role in enhancing the catalytic performance. In this work, a series of well-defined single-site Ni-grafted TiO 2 photocatalysts with unique and specific coordination environments, 2,2′-bipyridine-Ni−O−TiO 2 (T−Ni Bpy) and 2-Phenylpyridine-Ni−O−TiO 2 (T−Ni Phpy), were constructed with the methods of surface organometallic chemistry combined with surface ligand exchange for visible-light-induced photocatalytic hydrogen evolution reaction (HER). A prominent rate of 33.82 μmol ⋅ g −1 ⋅ h −1 and a turnover frequency of 0.451 h −1 for Ni are achieved over the optimal catalyst T−Ni Bpy for HER, 260-fold higher than those of Ni−O−TiO 2 . Fewer electrons trapped oxygen vacancies and a larger portion of long-lived photogenerated electrons (>3 ns, ~52.9 %), which were demonstrated by the electron paramagnetic resonance and femtosecond transient IR absorption, correspond to the photocatalytic HER activity over the T−Ni Bpy. The number of long-lived free electrons injected from the Ni photoabsorber to the conduction band of TiO 2 is one of the determining factors for achieving the excellent HER activity.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Runqian Yang,Rui Xiong,Kunpeng Wang,Yining Jiang,Qian Chen,Liping Ruan
The problem of microwave pollution becomes more serious with the widespread popularity of electronic equipment; the development of microwave absorption materials has assumed critical importance. However, most reported carbon-based microwave absorption materials have no obvious absorption performance in 2–4 GHz (S band), which seriously limits their application. In this work, Ni(OH)2-coated peach pit carbon [Ni(OH)2/C1] is prepared by simple precipitation to achieve a minimum reflection loss (RL) value of −46.2 dB (5.6 mm, at 2.9 GHz) and absorption band cover 2.54–4 GHz in the thickness range of 3.7–6 mm in the S-band. In addition, Ni(OH)2/C1 achieved an RLmin value of −58.05 dB (2.7 mm, at 7.68 GHz) and maximum effective absorption bandwidth (EAB) of 3.95 GHz in the range 2–18 GHz. Our work provides new insights into the microwave absorption in low frequencies and expands the application range and scenarios of carbon-based materials.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 19
·14859
·
IF 5.6
Yan Xiao,Jie Li,Yuan Tan,Xingkun Chen,Fenghua Bai,Wenhao Luo,Yunjie Ding
Catalytic conversion of biomass-derived ethanol into n-butanol through Guerbet coupling reaction has become one of the key reactions in biomass valorization, thus attracting significant attention recently. Herein, a series of supported Cu catalysts derived from Ni-based hydrotalcite (HT) were prepared and performed in the continuous catalytic conversion of ethanol into butanol. Among the prepared catalysts, Cu/NiAlOxshows the best performance in terms of butanol selectivity and catalyst stability, with a sustained ethanol conversion of ~35% and butanol selectivity of 25% in a time-on-stream (TOS) of 110 h at 280 °C. While for the Cu/NiFeOxand Cu/NiCoOx, obvious catalyst deactivation and/or low butanol selectivity were obtained. Extensive characterization studies of the fresh and spent catalysts, i.e., X-ray diffraction (XRD), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Hydrogen temperature-programmed reduction (H2-TPR), reveal that the catalysts’ deactivation is mainly caused by the support deconstruction during catalysis, which is highly dependent on the reducibility. Additionally, an appropriate acid–base property is pivotal for enhancing the product selectivity, which is beneficial for the key process of aldol-condensation to produce butanol.Keywords:Ni-based hydrotalcite;biomass conversion;support effect;selectivity;stability
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高影响因子
FUEL
·
2023
·
IF 7.4
Deshi Yang,Jianpeng Huang,Zhipeng Hu,Yuanyuan Miao,Fengqiang Wang,Zhijun Zhang,Yanjun Xie,Shouxin Liu,Qingwen Wang,Charles U. Pittman
Lignin is the most abundant aromatic biopolymer. Thus, preparation of BTX (benzene, toluene and xylenes) by catalytic fast pyrolysis (CFP) of lignin is attractive. Ni-Al mixed metal oxide (MMO) catalysts, derived from pyrolyzing Ni-Al layered double hydroxides (LDH), were prepared for the catalytic fast pyrolysis of lignin. The effects of catalyst Ni/Al ratio, catalyst dosage and pyrolysis temperature on the liquid products were investigated by Py-GC/MS. The Ni 3 Al 3 -MMO produced the best liquid product distribution from lignin at 700 ℃. The selectivity of Ni 3 Al 3 -MMO for aliphatic hydrocarbons and monocyclic aromatic hydrocarbons (MAHs) was 18.0% and 78.2%, respectively. The selectivity to polyaromatic hydrocarbons (PAHs) was 3.8%. No phenols and phenolic derivatives were produced. This is related to the mesoporous catalytic structure (pore size of 14.37 nm), large external surface area (134.74 m 2 /g) and strong acidity (4.92 mmol NH3 /g) of Ni 3 Al 3 -MMO. In addition, a mechanistic study was performed with the lignin model compound (guaiacol) showing that Ni 3 Al 3 -MMO exhibits strong deoxygenation activity for aromatic C–O bond cleavage of lignin.
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