RSC Advances
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2022
·Vol. 12
·期 19
·11843-11852
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IF 4.036
Qi Guo,Xinglong Hou,Wei Xu,Junli Liu
Ni3Co1/ELAC catalyst, prepared by the enzymatically hydrolyzed lignin activated carbon as a carrier and a 3 : 1 ratio content of nickel and cobalt, can selectively convert furfural to cyclopentanol (CPL) in aqueous solution. We used activated carbon prepared by the phosphoric acid method as the carrier, and investigated the effect of the carrier on the catalyst activity. The ratio of bimetal (Ni, Co) content and reaction conditions (reaction temperature, reaction time, initial H2 pressure) have also been investigated in the furfural hydrogenation. With the optimal Ni3Co1/ELAC catalyst, the conversion rate of furfural and the selectivity of CPL were 100% and 94.1%, respectively. In this process, some important catalysts were studied by XRD, XPS, ICP-AES, BET and TEM characterization. Through experimental results and other people's research, we deduced a reasonable reaction path and verified it by replacing the reaction substrate and solvents. Finally, the experiment proved that the formation of CPL by furfural required the occurrence of a rearrangement reaction and the participation of aqueous solution.
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COMPOSITES PART B-ENGINEERING
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2022
·
IF 11.322
Yue Liu,Zhihui Zeng,Sinan Zheng,Jing Qiao,Wei Liu,Lili Wu,Jiurong Liu
A type of nickel/manganese oxide (Ni/MnO)/carbon nanocomposite fibers were prepared via a facile and scalable electrospinning and carbonization approach. In comparison to the pure carbon showing a severe agglomeration, the uniformly embedded MnO and Ni nanoparticles promoted the formation of the fibrous carbon-based nanocomposites with an average diameter of 250 nm and a rough surface. The synergistic coactions of the MnO nanoparticles acting as impedance modulating mediator, the magnetic Ni nanoparticles, and the conductive, fibrous carbon with large aspect ratio and rough surface contributed to the excellent electromagnetic wave (EMW) absorbing performance of the nanocomposites. The nanocomposites with a MnO/Ni ratio of 1:1 exhibited an effective absorption bandwidth of 6.5 GHz at a thickness of 2.9 mm and a minimum reflection loss of −53.23 dB at a thickness of 2.3 mm. The EMW absorption mechanisms of the nanocomposite fibers were discussed at length, which showed the importance of the multi-component building units and microstructure for achieving high EMW absorbing performance. This work thus suggested a convenient, facile, and scalable manufacturing approach for constructing high-performance multi-component nanocomposite fiber based EMW absorbing materials.
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FUEL
·
2022
·
IF 8.035
Xiaoxian Li,Min Lin,Rui Li,Qiang Lu,Mingde Yang,Yulong Wu
In this work, methods employing ethanol for dispersion as well as precursor combination by rotary evaporation were combined to produce Ni-based ZSM-22 catalysts. The catalytic activity in palmitic acid deoxygenation over Ni/Z22@E was enhanced compared with that of the wet-impregnated method. The conversion of palmitic acid reached 98.9 %, in which C16/C15 alkane was as high as 4.07. The Ni species on the surface of catalysts showed strong stability so that not susceptible to inactivation by coking or leaching. In addition, the mechanism and kinetics of the palmitic acid deoxygenation reaction were analyzed. The results showed that the ethanol dehydration reaction was the most difficult to occur, and the high C 16 alkanes selectivity can be attributed to the low activation energy of the hydrodeoxygenation (HDO) pathway. Both experimental and kinetics calculation results suggested that there may be a mechanistic change in the fatty acid deoxygenation reaction at around 240 °C that resulted in a large increase in the hydrodecarboxylation (HDX) pathway. Based on this, selected adjustments of the products were proposed for fatty alcohols below 220 °C, C 16 alkanes between 260 and 280 °C, and C 15 alkanes above 280 °C.
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ELECTROCHIMICA ACTA
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2022
·
IF 7.336
Guo-Duo Yang,Bing Li,Yi-Han Song,Lei Ding,Shen-Gen Gong,Xing-Long Wu,Jing-Ping Zhang,Yan-Fei Li,Hai-Zhu Sun
Lithium metal anode with high theoretical capacity has attracted lots of attention, but dendrite growth results in poor cyclic stability during the process of repeated plating/stripping. Herein, a scaffold constructed by surface growth of hierarchical lithiophilic acicular CoNiO 2 on the porous Ni foam (NF@CoNiO 2 ) is synthesized and used to construct three-dimensional (3D) host for lithium metal anode. The experimental results show that the lithium dendrite growth is effectively inhibited and satisfactory cycling performance is achieved. Benefiting from the stable lithiophilic sites, good conductivity from the NF, large porosity, and high strength 3D structure, the host enable Li||NF@CoNiO 2 @Li cells to deliver low hysteresis voltage (7.7 mV) and ultra-long cycling stability (more than 2800 h, 1400 cycles) at 1 mA cm −2 with a capacity of 1 mAh cm −2 . The full cells configured the NF@CoNiO 2 @Li anode with LiFePO 4 still display a reversible discharge capacity of 126.2 mAh g −1 after 140 cycles with a Coulombic efficiency of 92.5% at 1C. This work paves a feasible way to construct the lithiophilic skeleton for dendrite-free lithium metal anode.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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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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MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 223
·期 8
·2100234
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IF 2.527
Xun Zhang,Yiming Sun,Xiuping Yin,Yue Ma,Lianqi Zhang,Defa Wang
Gel polymer electrolyte (GPE) has attracted extensive interest due to superior interfacial compatibility, excellent plasticity, and improved electrochemical stability. Polymer matrix is of great importance to the performance of lithium metal battery, especially for Ni-rich cathode system with high working potential. Herein, a rigid-flexible composite polymer matrix comprising methylcellulose (MC), polymethyl methacrylate (PMMA), and Al 2 O 3 is prepared. After saturated with the liquid electrolyte of 1 M LiDFOB in EC/DMC (1:1, v:v), the obtained GPE exhibits a high ionic conductivity of 0.20 × 10 −3 S cm −1 and a wide electrochemical stable window up to 5.6 V. The synergistic effect of inorganic fillers and the ester groups on polymer matrix are conducive to the uniform deposition of Li-ion and advantageous to the formation of smooth and robust interfacial passivation layer. After assembled with Ni-rich cathode LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA), a capacity of 158.1 mAh g −1 is maintained after 200 cycles at 0.1 C, while a high value of 133.1 mAh g −1 is delivered at 2 C. These results indicate that the as-prepared MC-PMMA-Al 2 O 3 GPE (abbreviated as MPAA) is favorable for the interfacial compatibility of lithium metal batteries and shows superior electrochemical stability at high working voltage.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Jiaxin Zhu,Yihua Chen,Yurong Gu,Hang Ma,Mingyue Hu,Xinlei Gao,Tongzhou Liu
The discharge of widely used per- and poly-fluorinated compounds (PFCs) leads to their environmental prevalence, bioaccumulation and biotoxicity; and attracts researches focusing on their treatment in wastewater. Electrochemical reductive treatment is a promising alternative due to its milder reaction conditions and easy operation. The feasibility of electrochemical reductive decomposition of PFOA using a Rh/Ni cathode was explored. The Rh/Ni cathode was fabricated by coating Rh 3+ on Ni foil through electrodeposition . The Rh coating was primarily elemental and in a Rh(111) crystalline form. PFOA decomposition and defluorination were observed when using the Rh/Ni cathode where DMF was the solvent and the cathode potential was −1.25 V. A hydrodefluorination reaction was considered having occurred. Because possessing d electrons and empty d orbitals, the Rh coating enhanced PFOA adsorption onto the cathode surface and facilitated C F bond activation through Rh···F interactions. Moreover, the Rh(111) crystal helped chemisorb the generated H* and supply it participating in PFOA decomposition. With the continuous interaction of cathode-supplied electrons, C F bond would ultimately dissociate and transform to C H bond by H* substitution. Adding FeCp 2 * as a supporting electrolyte enhanced PFOA decomposition by working as the shuttle facilitating PFOA migration to the cathode surface.
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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
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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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Silicon
·
2021
·Vol. 14
·期 11
·6341-6350
·
IF 2.67
Xu Hongli,Jin Xing,Zhou Xuetong,Du Xinghong,Xing Pengfei,Zhuang Yanxin
In this paper, the acceleration effect of nickel (Ni) on the direct nitridation process of the diamond-wire saw powder (DWSP) was investigated. The DWSP doped with Ni additives were nitrided at different temperatures. To study the mechanism of accelerated nitridation, the thermodynamics of Si-O-N-Ni and nitridation processes were analyzed by FactSage 7.2 and single-crystal silicon blocks were also nitrided instead of the DWSP. The results revealed that Ni decreased the nitridation temperature at which the DWSP began to gain significant weight and exhibited an excellent accelerating effect on the nitridation of the DWSP. At 1300°C the DWSP containing 2.0 wt% Ni additives had been completely nitrided within 2 h, whereas the DWSP without Ni additives had not been nitrided yet. Based on the equivalent substitution experiment, it could be concluded that the presence of Ni additives accelerated the nitridation and promoted the formation of the α-Si 3 N 4 nanorods through facilitating the generation of the SiO(g) and destructing the silica film on the surface of silicon at lower temperature. Meanwhile, Ni additives also played an important part in the growth of α-Si 3 N 4 nanorods by forming liquid Ni-Si alloy in the product.
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高影响因子
FUEL
·
2021
·
IF 6.609
Chengming Huang,Dingmei Han,Linjie Guan,Linhua Zhu,Yi Mei,Dedong He,Yun Zu
Propane dehydrogenation (PDH) is a prospective benign process for the production of propylene, but generally depends on high-price Pt and toxic Cr(VI) catalysts that often suffer from the rapid deactivation derived from metal sintering and severe coke deposition. To overcome these problems, the breakthroughs in an alternative catalyst design with efficient, low-cost and eco-friendly play a crucial role in successfully developing this process. Here, we facilely fabricate the bimetallic-site catalyst of Ni-Zn anchored in the zeolitic framework of silicalite-1 (depicted as NiZn-S-1) by employing ligand-protected strategy, which performs high temperature stability. Under comparable conditions, the NiZn-S-1 catalyst with high Ni/Zn molar ratio of 3:1 (named 0.2Ni0.06Zn-S-1) exhibits superior catalytic activity (initial propane conversion of 32.5 % and actual TOF propane of 28.5 min −1 ) with low deactivation rate (0.0778 h −1 ) and great propylene selectivity (>90%) after 30 h on stream. In particular, the catalytic performance on this catalyst almost keeps same as that of fresh catalyst after 4 successive oxidation–reduction cycles. Multiple characterizations further demonstrate that the enhancement of PDH performance ought to be attributed to the synergistic effect between bimetallic Ni-Zn sites, which favors the selective activation of C–H bond and propylene desorption to reduce the formation of coke species with high graphitization degree, boosting the improvement of catalyst stability. The design of novel bimetallic-sites catalyst can give a new idea on the development of alternative PDH catalysts with economical- and environment-friendly in the future.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Zi Jun Gao,Zhou Peng Li,Bin Hong Liu
In this work, we synthesized La-incorporated Ni-B amorphous composites and investigated their effects on enhancing dehydrogenation/hydrogenation properties of MgH 2 . MgH 2 with 5 wt% 2La-3Ni-B demonstrated significantly improved dehydriding kinetics. About 6.0 wt% hydrogen could be released within 5 min at 300 °C. Moreover, no decrease in deydrogenation rate was observed within ten cycles. XRD , XPS , SEM and HRTEM examinations revealed that the La incorporation into Ni-B resulted in an amorphous La-B-O structure that could keep its disorder state up to 600 °C. The crystallization and growth of Ni dispersed in the La-B-O structure was significantly retarded. Also the alloying of Mg with Ni or La was not observed. As a result, the added La-Ni-B composites showed higher structural and catalytic stability than Ni-B during hydriding/dehydriding cycling of MgH 2 at high temperatures.
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