JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 12
·1-19
·
IF 2.8
Si Tiantian,Xie Shuai,Ji Zhijiang,Ma Chao,Wu Zihao,Wu Junyu,Wang Jing
The heterostructure composite has unique advantage in promoting electromagnetic wave (EMW) absorption due to special composition and structure. Herein, carbon black (CB)/Ni hybrids were successfully assembled on basalt fiber (BF) by electrostatic self-assembly and dip-coating processes. The EMW absorption performance is optimized by regulating the ratio of flower-like Ni and CB. Based on the synergistic effect of magnetic loss Ni and dielectric loss CB, the RL of the prepared BF-CB/Ni composite reaches up to − 35.29 dB at 16.97 GHz with thickness of 1.5 mm and efficient absorption bandwidth (EAB) reaches 5.38 GHz. Large heterogeneous contacts constructed by various components on the surface of BF strengthen the polarization loss and conductivity loss. This work provides an effective way to design absorbing materials with good environmental stability and corrosion resistance.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 23
·11318-11324
·
IF 3.3
Jiazheng Zhu,Chengjie Duan,Sen Ye,Qizhong Zhang,Kun Li,Guangke He,Xiang Liu,Zhiguo Zhang
Exploring synthetic methods and catalysts that are easy to handle, highly active, and low-cost for producing industrially important chemicals is a long-term goal in both science and industry. Herein, we present a general and facile Ni-catalyzed reductive amination of aldehydes/ketones methodology using hydrazine as both nitrogen and hydrogen sources, instead of the traditionally used hydrogen gas and ammonia. The mesostructured alumina-supported Ni catalyst with a relatively high ratio of Ni0 and small-sized Ni nanoparticles plays a critical role in this transformation, resulting in 55 aldehydes/ketones successfully converting to their corresponding primary amines with 61–99% yields. This work outlines a low-cost yet robust catalytic methodology for the facile and general synthesis of primary amines for practical laboratory and industrial application.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Qirun Wang,Yanjie Duan,Zhixiong Huang,Xiaowei Xu,Jichao Shi,Lin Lin,Sheng Han,Runping Jia,Shufang Chang,Dandan Wu
Electrocatalysts with densely exposed sites and high intrinsic activity are desired for high-efficiency oxygen evolution reaction (OER). In this paper, we report the microwave assisted solvothermal growth of NiMoO 4 nanoflowers on electrodeposited Ni(OH) 2 nanosheets , forming a high specific surface area (132.5 m 2 g -1 ) nanoflower-like NiMoO 4 /Ni(OH) 2 configuration supported on a conductive nickel foam (NF) substrate. The as-prepared NiMoO 4 /Ni(OH) 2 /NF behaved efficiently as a self-supported 3D catalyst electrode for alkaline OER, compared with commercial RuO 2 (298 mV overpotential at 10 mA cm −2 and Tafel slope of 88.6 mV dec −1 ), needing a low overpotential of 292 mV to attain 10 mA cm −2 , with a small Tafel slope of 85.0 mV dec −1 and good stability for 100 h running at 10 mA cm −2 in 1.0 M KOH. Aside from enlarged surface area for more exposed edge sites for catalysis, the modulated synergy between Ni and Mo atoms probably contributes to enhanced intrinsic activity. A more electronegative Mo increases the electron density of Ni, thus accelerating the deprotonation of intermediates and driving the transition from Ni to NiOOH, leading to modulated thermodynamics and kinetics for OER catalysis.
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Sustainable Materials and Technologies
·
2023
·
IF 9.6
Chao Wang,Jingyi Zhang,Li Wang,Jianmin Feng,Liqun Wang,Lei Dong,Conglai Long,Dejun Li,Feng Hou,Ji Liang
The crucial step for splitting water is the oxygen evolution reaction . The key to promote this reaction lies in the catalyst. Molybdenum disulfide , as a two-dimensional material with molybdenum and sulfur atoms stacked, is especially suitable as a doping platform to develop high-performance OER catalysts. Fe/Co/Ni ternary transition metal combination has always been a highly active catalytic site for OER. Heteroelement of Fe/Co/Ni doping is expected to effectively modify the local electronic configuration of matrix materials and thus enhances their electrocatalytic OER capability. With this in mind, we report a simple in-situ hydrothermal doping of MoS x nanowires on iron‑nickel alloy foam with ternary transition metal of Fe/Co/Ni. This ternary transition metal of Fe/Co/Ni doped f self-supported electrode (denoted Fe/Co/Ni-MoS x /INF) displays outstanding OER performance in terms of small overpotentials of 214 and 263 mV at current densities of 10 and 100 mA/cm 2 , respectively, in alkaline solution. It was far better than the commercial Ir/C catalysts (253 and 434 mV@10 and 100 mA/cm 2 ). The Tafel slope is about 48.1 mV/dec. Moreover, Fe/Co/Ni-MoS x /INF also has an excellent catalytic stability without any obvious performance decay after 20 h operation. This work contributes to the investigation of high-efficiency OER catalysts based on transition metal-doped MoS x and offers a substitute for noble metal catalysts.
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Small
·
2023
·Vol. 19
·期 12
·2207197
·
IF 13.3
Bei Li,Ziqian Ma,Xiao Zhang,Jia Xu,Yujin Chen,Xitian Zhang,Chunling Zhu
Hollow carbon spheres are potential candidates for lightweight microwave absorbers. However, the skin effect of pure carbon-based materials frequently induces a terrible impedance mismatching issue. Herein, small-sized NiO/Ni particles with heterojunctions on the N-doped hollow carbon spheres (NHCS@NiO/Ni) are constructed using SiO 2 as a sacrificing template. The fabricated NHCS@NiO/Ni displayed excellent microwave absorbability with a minimum reflection loss of −44.04 dB with the matching thickness of 2 mm and a wider efficient absorption bandwidth of 4.38 GHz with the thickness of 1.7 mm, superior to most previously reported hollow absorbers. Experimental results demonstrated that the excellent microwave absorption property of the NHCS@NiO/Ni are attributed to balanced dielectric loss and optimized impedance matching characteristic due to the presence of NiO/Ni heterojunctions. Theoretical calculations suggested that the redistribution of charge at the interfaces and formation of dipoles induced by N dopants and defects are responsible for the enhanced conduction and polarization losses of NHCS@NiO/Ni. The simulations for the surface current and power loss densities reveal that the NHCS@NiO/Ni has‑ applicable attenuation ability toward microwave under the practical application scenario. This work paves an efficient way for the reasonable design of small-sized particles with well-defined heterojunctions on hollow nanostructures for high-efficiency microwave absorption.
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Materials Today Chemistry
·
2023
·
IF 7.3
Yi-Jie Kong,Ao-Chuan Zheng,Zhuangzhuang Wu,Qi Chen,Xin-Ming Hu
Electrochemical CO 2 reduction is a promising method to mitigate excessive CO 2 emission and realize CO 2 valorization. However, the lacking of efficient catalysts hinders the practical applications of this important process. Here, we report a new type of hollow carbon spheres containing isolated Ni atoms on both external and internal surfaces by an integrated bottom-up and top-down strategy. For such unique structure, the material exhibits good activity for electrochemical CO 2 reduction with much higher current density and Faradaic efficiency for CO production than the materials with common structures (i.e., the solid spheres with Ni sites only on external surface). The enhanced activity of the material is attributed to the favored mass transport and charge transfer guaranteed by the presence of hollow structure as well as active Ni sites on both external and internal surfaces. Furthermore, we demonstrate that a secondary pyrolysis of the material can improve its activity and stability for CO 2 reduction. Such treatment can increase the degree of graphitization and reaction kinetics of the material during electrocatalysis . The final material exhibits a large current density (150 mA cm −2 ) and a high Faradaic efficiency for CO production (94%) in a flow cell, showing good potential for practical applications. This work extends the concept of structural regulation of catalysts and provides the guidance for the design of high-performance catalysts for electrochemical CO 2 reduction.
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CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Ping Zhang,Hao Chen,Lin Chen,Ying Xiong,Ziqi Sun,Haoyu Yang,Yingke Fu,Yaping Zhang,Ting Liao,Fei Li
Atomically dispersed catalytic metal sites anchored on N-doped carbon support catalysts (M-N-C) show great prospects for CO 2 electroreduction. Here, single-layer NiZn layered double hydroxides (NiZn-LDHs) was used as a sacrificial assistant to fabricate single-Ni atom anchored on ultrathin porous carbon catalyst. NiZn-LDHs were exfoliated to single-layer by polyhydroxy compounds which took as the carbon resource in Ni-N-C, and single layer NiZn LDHs taking as the Ni resource could avoid the agglomeration of Ni atoms during calcining. The CO Faradaic efficiency (FE CO ) of the synthesized Ni-N-C catalyst exceeded 90% at −0.6 to −1.0 V and a FE CO of 95.2% with a current density of 24 mA cm −2 at −0.9 V. This work not only provides a new method for preparing M-N-C catalysts, but also offers an effective and controllable strategy for large-scale production of high-performance single-atom catalysts.
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Catalysis Science & Technology
·
2022
·Vol. 13
·期 2
·468-478
·
IF 6.177
Xinyu Lu,Xiaoli Gu
The chemical demand for alkyl phenols (mainly extracted from fossil-derived resources) has been increasingly growing, which has accelerated global energy shortages. Due to the inherent aromaticity of lignin, its effective conversion into alkyl phenols is central to its adoption as a sustainable precursor to produce biochemicals. In this study, catalytic transfer hydrogenation (CTH) of alkali lignin was carried out in a mixed medium (isopropanol/formic acid) at 240 °C for 8 h over a series of bimetallic Ni based catalysts. The acidity and reducibility of the as-prepared catalysts are enhanced via WO3 introduction (to form a WO3–Al2O3 mixed support) and a bimetallic synergistic effect, respectively, leading to improved catalytic activity and selectivity towards alkyl phenols. Different kinds of phenolic compounds (e.g., those with substitutions of methoxyl, alkyl, alkenyl, carbonyl, carboxyl, or hydroxyl groups) were generated over these bimetallic Ni based catalysts with various combinations of Ni + Fe/Zn/Co/Mo/Cu, which was due to their own catalytic promotion of certain reactions (e.g., hydrogenation, deoxygenation, and/or hydrogenolysis). Reaction mechanisms of lignin depolymerization were proposed according to the distribution of phenolic compounds. This work provides a comprehensive investigation on yielding alkyl phenols from lignin CTH over a series of inexpensive bimetallic Ni based catalysts (Ni/(Fe/Zn/Co/Mo/Cu)–WO3/Al2O3), and undertook a catalytic evaluation of the bimetallic synergistic effects on improving the chemical selectivity towards alky phenols, which is beneficial for lignin valorization.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiahang Qiu,Zhen Xin,Mu Zhang,Xudong Sun
Due to the multiple scattering of microwaves and the existence of electron aggregation polarization at heterogeneous interfaces, the design of hollow or anisotropic microstructures has always been one of the research focuses of microwave absorption materials (MAMs). In this work, an effective strategy has been proposed reasonably to manufacture yolk-shell pompon-like Fe@void@CeO 2 @Ni nanospheres via hydrogen reduction and multiple solvothermal procedures. The results show that the metallic iron core with a diameter of 300 nm and the outer CeO 2 layer with a thickness of 70 nm compound to form a yolk-shell structure, and the metallic nickel nanosheets with a length of about 100 nm are evenly embedded in the CeO 2 layer to form a pompon-like structure. These unique microstructures provide heterogeneous interfacial polarization, three-dimensional conductive networks, and multiple electromagnetic scattering which bring excellent dielectric loss to the composites. Combined with the inherent strong magnetic loss of magnetic metals, as-prepared composites exhibit excellent microwave absorption properties. The minimal RL value reaches −48.9 dB and the efficient absorption bandwidth reaches 14 GHz with the thickness ranges from 2.5 to 7 mm. Hence, this unique microstructural design scheme has great prospects in the field of MAMs.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xin Ning,Heming Wang,Ganghua Zhou,Longyun Zhang,Yanju Yang,Jingya Sun,Xiaozhi Wang
Ni catalysts decorated with trace Rh supported on γ-Al2O3 were prepared by the co-impregnation method. To obtain the Ni–Rh nanoparticles with different nanostructures and chemical compositions, bimetallic catalysts with varied Ni/Rh molar ratios were prepared. For comparison, monometallic Ni/γ-Al2O3 and Rh/γ-Al2O3 catalysts were also prepared by the impregnation method. The selective gas phase catalytic hydrodechlorination of 1,2-dichloroethane to ethylene was used to evaluate catalytic performances of the catalysts. The catalysts were characterized by X-ray diffraction, N2 adsorption, X-ray photoelectron spectroscopy, H2 temperature-programmed reduction, transmission electron microscopy–energy-dispersive X-ray, and CO chemisorption. It was found that the introduction of Rh to Ni catalyst facilitated the generation of spillover hydrogen which could enhance the ability of the Ni catalyst for H2 activation. In bimetallic catalysts, there was an intimate interaction between Ni and Rh, and isolated Rh sites were formed due to the dilution effect of Ni. Accordingly, compared with the monometallic Ni catalyst for gas phase catalytic hydrodechlorination of 1,2-dichloroethane, the bimetallic Ni–Rh(800)/γ-Al2O3 catalyst exhibited markedly higher 1,2-dichloroethane conversion (37%) and comparable selectivity to ethylene (95%). The findings in this study indicate that Ni–Rh/γ-Al2O3 with trace Rh can be used as a promising catalyst for highly effective and selective catalytic hydrodechlorination of chlorinated hydrocarbons.
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CATALYSIS TODAY
·
2023
·
IF 5.3
Zekun Li,Zhao Wang
Metal-organic frameworks (MOFs) have been regarded as promising OER catalyst candidates, while synthetic strategies were used to enhance the OER performance of MOFs. The coordinatively unsaturated metal sites (CUMSs) are recognized as the important active sites on MOFs. Herein, the CUMSs of nickel-based MOF (Ni-BTC) were successfully tuned by glow discharge plasma in room temperature. The electron etching strategy controlled the concentration of CUMs and remained the main structure due to the low temperature and adjustable parameters. The electrochemical activity of the Ni-BTC by is correlated with the abundance of CUMSs. Specifically, Ni-BTC-500–5 obtained by plasma etching 5 min shows a highest catalytic activity of OER, which exhibits a low overpotential (347 mV at 100 mA·cm -2 ), low Tafel slope (37 mV·dec -1 ), and large double layer capacitance (22.0 mF·cm -2 ). The mechanism of plasma etching and the role of CUMs are also discussed.
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ChemSusChem
·
2023
·Vol. 16
·期 7
·e202202252
·
IF 8.4
Wei-Chen Zheng,Zheng Huang,Chen-Guang Shi,Yaping Deng,Zi-Hao Wen,Zhen Li,Hui Chen,Zhongwei Chen,Ling Huang,Shi-Gang Sun
Graphical Ready, willing, and stable : Interphase stability issues affect the commercialization of Ni-rich cathode materials. In this study, interphase engineering improves the interphase stability of LiNi 0.83 Co 0.11 Mn 0.06 O 2 in lithium-ion batteries. A robust cathode-electrolyte interphase is constructed by a nucleophilic reaction in the commercial electrolyte and the cathode achieves long-term cycling stability in a Li||NCM83 cell. Ni-rich cathode materials are considered promising candidates for next-generation lithium-ion batteries because of their high energy density and low cost. However, interphase failure at the surface of Ni-rich cathodes negatively impacts cycling performance, making it challenging to meet the requirements of long-term applications. In this study, a strategy is developed to improve interphase properties through introduction of a nucleophilic reaction-based additive, using an appropriate amount of the inducer lithium isopropoxide (LIP) in the commercial electrolyte to achieve long-term cycling stability of Li||LiNi 0.83 Co 0.11 Mn 0.06 O 2 (NCM83) cells. This strategy enables Li||NCM83 cells to maintain a capacity of 148.7 mAh g −1 with a retention of 83.3 % even after 500 cycles. This outstanding cycling stability is attributed to a robust cathode-electrolyte interphase (CEI) constructed on NCM83 surface LIP-induce ring-opening polymerization of ethylene carbonate (EC). As a result, the organic-inorganic components of the CEI effectively constrain gas evolution and the corresponding phase transformation behavior. Furthermore, the CEI also suppresses microcrack formation and eventually sustains the Ni valence and coordination environment at high voltage.
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