INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Mengting Wang,Jiajun Yang,Bo Chi,Jian Pu,Jian Li
La 0.8 Ce 0.2 Mn 0.6 Ni 0.4 O 3 with (LCMN@CuO) and without (LCMN) CuO addition are prepared by solution methods, followed by reduction in 5% H 2 –N 2 stream at 650 °C to form Ni exsolved and CuO reduced catalysts, LCMN@Ni and LCMN@Ni/Cu, for ethanol (EtOH) steam reforming (ESR). The catalysts are characterized by X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM), temperature programmed reduction (H 2 -TPR), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy etc., and are evaluated for ESR with a steam/carbon ratio of 3 and a weight hourly space velocity (WHSV) of 4 h −1 at temperatures between 500 and 700 °C. Ni exsolution and CuO reduction are confirmed on the substrates in LCMN@Ni and LCMN@Ni/Cu. Both the catalysts demonstrate a complete conversion of EtOH, forming mainly H 2 , CO 2 , CO and CH 4 . And increasing temperature to 700 °C increases the yields of H 2 and CO to the levels about 90% and 40%, respectively, at the cost of CH 4 ; and such performance remains unchanged for 30 h. These results indicate that both LCMN@Ni and LCMN@Ni/Cu are promising catalysts for ESR, the main difference between them is that the latter is more chemically stable and more resistant to carbon deposition under ESR conditions.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 12
·9057-9064
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IF 2.22
Zhao Jingkui,Liu Xiansong,Kan Xucai,Chen Zuhua,Liu Chaocheng,Wang Wei,Lv Qingrong,Huang Jingwen,Shazeda Mudssir
In this study, novel Ni–Cu–Zn ferrites with the chemical formula [Ni 0.6 Zn 0.4 ][Cu 0.2 Co x Fe 1.8− x ]O 4 ( x = 0, 0.05, 0.10, 0.15, 0.20, 0.25) doped with Co 2+ ions were designed and manufactured by standard solid-state reaction method. The magnetic properties, surface characteristics, and ion occupancy of ferrites were studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM), and we explained the different mechanisms of the results and the relationship between magnetic properties and microstructures. For the obtained samples, cobalt ions entered the lattice, and all samples were characterized as spinel structures. As the doping amount of Co 2+ ions increases, the lattice constant and volume of the sample also increases. With an appropriate doping level, Co 2+ ions-doped Ni–Cu–Zn ferrites can maintain higher saturation magnetization, higher magnetic permeability, and lower hysteresis loss. When x ≤ 0.1, the saturation magnetization M s increases significantly as the doping amount of Co 2+ ions increases, but when x > 0.1, the value decreases. The experimental results show that the saturation magnetization value is 118.08 emu/g, the magnetic permeability value is 39.47 H/m, and the hysteresis loss is 1.192 mW/cm 3 at an optimum doping amount. Therefore, the sample achieves the best magnetic properties when the doping amount is 0.1.
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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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Sustainable Energy Technologies and Assessments
·
2021
·
IF 5.353
Aixia Chen,Zheng Tian,Rong Han,Xiao Wei,Ruirui Hu,Yang Chen
In this study, a nickel (Ni)-based catalyst was loaded onto steel slag that was rich in metal oxides using impregnation method. The effects of the catalyst on hydrogen-rich gas produced using sludge steam gasification were discussed. Under the conditions of 900 ℃, steam flowrate of 1.5 g min −1 and 20% Ni-based loading rate, the gas and H 2 yield reached 0.78 Nm 3 kg −1 and 15.72 mol kg −1 . At this time, the volume fraction of H 2 was as high as 45.096%. Compared with the raw sludge gasification without Ni-based catalyst, the gas and H 2 yield were increased by 39.22% and 60.15% respectively. However, excessive flowrate of steam (≥1.5 g min −1 ) and excessive rate of loading of Ni-based (≥25%) catalyst would lead to a decrease in the production of gas. In addition, the impregnation method could effectively disperse NiO particles on the surface of the support, increasing the ratio of active sites on the surface of catalyst and improving the catalytic activity. These characteristics indicated that the Ni-based steel slag catalysts prepared by the impregnation method had high application potential in the process of sludge steam gasification, and provided a novel idea for solid wastes recycling.
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FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Shasha Liu,Yuhui Wang,Juan Wang,Jianbin Zhou,Xun Hu,Hongqi Sun,Muhammad Asif Akhtar,Hong Zhang,Yong Huang,Shu Zhang
Char-supported metals as catalysts has attracted much attention due to the renewability and structural controllability of char. To understand the effect of char physicochemical structures on the activities of itself and it-supported metal, decomposition of a α−O−4 lignin model compound (benzyl phenyl ether, BPE) over various char-supported Ni catalysts was studied at 400 °C, in which the char supports were prepared at 400 °C, 600 °C, and 1000 °C, respectively. The results showed that the conversion of BPE over the original chars decreased from 17.63% to 7.79% when the preparation temperature of char increased from 400 °C to 1000 °C, while an opposite trend was found for the char-supported Ni, particularly full conversion of BPE was realized when char prepared at 1000 °C was used as the carrier. In addition to the catalysis of Ni, the introduction of Ni improved the graphitization degree and specific surface area of the char support, thus promoting the breakage of C α −O in BPE to mainly generate phenol and toluene. The synergistic effect of char support and Ni on BPE decomposition was demonstrated.
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SURFACE & COATINGS TECHNOLOGY
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2021
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IF 4.158
Ming-Jie Zhou,Teng Xu,Ji-Ming Hu
Layered double hydroxide (LDH) films have been used to protect metal substrates because of their superior barrier performance and capability of capturing corrosive anions (such as Cl − ) by exchange with interlayer anions. In this preliminary work, we determined that some photoactive LDHs (such as NiAl-LDH) can also provide cathodic protection to metals under light illumination, stemming from the light-generated electrons of semiconducting LDHs, if the energy level of the conduction band of LDHs is higher than the Fermi level of the metal. The current experimental results prove that the corrosion resistance of stainless steel is enhanced by the attached NiAl-LDH films in the dark and is further increased under light illumination due to photogenerated cathodic protection.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Songmei Li,Yimin Yu,Xiaoyan Sun,Xifeng Ding,Huafang Yang,Shibing Pan,Lixi Wang,Qitu Zhang
Ni(OH) 2 has been acknowledged as a promising oxygen evolution reaction (OER) electrocatalyst owing to its good electrochemical activity and low cost. However, application of the pristine Ni(OH) 2 is limited by the poor conductivity and low exposure of the active sites. Herein, a [email protected] (OH) 2 composite is prepared through a hydrothermal reaction. Heat treatment temperature proves to have a great influence on the electrocatalytic activity. In 0.1 M KOH electrolyte, the composite treated at 175 °C shows an overpotential of only 287 mV to reach the current density of 10 mA·cm −2 . Besides, the low Tafel slope (42 mV·dec −1 ) and superior stability (15 h at 10 mA·cm −2 ) also confirm the composite as an excellent OER electrocatalyst. The brilliant activity and stability toward OER can be attributed to the promoted coupling between Ni and Fe centers and the improved conductivity due to the 2D 18 p-electrons ring conjugate structure of hemin. Besides, effective hydrogen bonds between Ni(OH) 2 and hemin hinder the aggregation of Ni(OH) 2 , which ensures the catalyst enormous accessible active sites. This work offers a new method for the modification of Ni(OH) 2 as OER electrocatalysts. And the application of hemin also serves as a successful case for the use of biomass materials in OER electrocatalysis .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
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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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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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Wei Jin,Hengbo Wu,Weiquan Cai,Baohua Jia,Munkhbayar Batmunkh,Zexing Wu,Tianyi Ma
Designing highly-efficient and pH-universal electrocatalysts for overall water-splitting reactions is important for the sustainable production of hydrogen. Herein, NiRu nanoparticles encapsulated into N-doped carbon (NiRu@NC) are fabricated with the assistance of MOF for hydrogen evolution reaction (HER) and also evolved into core–shell structured nanomaterials with abundant interfaces for oxygen evolution reaction (OER, Ni/RuOx@C). Benefiting from optimized electronic structure, interfacial synergy effect and special core–shell structure (~150 nm), the newly developed electrocatalysts present remarkable electrocatalytic activities with small overpotentials to drive 10 mA cm −2 for the HER (19 mV in alkaline, 80 mV in neutral, 20 mV in acid) and OER (252 mV, 316 mV, 211 mV). Moreover, the obtained electrocatalysts exhibit outstanding catalytic performances for overall water-splitting in a two-electrode system with 1.53 V and 1.67 V to drive 10 mA cm −2 in basic and neutral electrolyte, respectively. Remarkably, a small potential of 1.47 V is required to deliver 10 mA cm −2 in acidic media and no significant decay of the activity is observed. This work paves the way for designing a novel class of electrocatalyst that can not only exhibit remarkable electrocatalytic water splitting performances in various conditions, but also possess excellent stabilities for future generation of clean energy.
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Journal of Magnesium and Alloys
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2021
·
IF 10.088
Bogu Liu,Bao Zhang,Haixiang Huang,Xiaohong Chen,Yujie Lv,Zhongyu Li,Jianguang Yuan,Ying Wu
Ni and carbon materials exhibit remarkable catalysis for the hydriding reaction of Mg. But the underlying mechanism of Ni/C hybrid catalysis is still unclear. In this work, density functional theory (DFT) calculation is applied to investigate the effect of Ni/C co-incorporation on the hydriding reaction of Mg crystal. The morphology and crystal structure of the Ni/C co-incorporated Mg sample show that the co-incorporated structure is credible. The transition state searching calculation suggests that both the incorporations of Ni and C are beneficial for the H 2 dissociation. But Ni atom has a dramatic improvement for H 2 dissociation and makes the H diffusion become limiting step of the hyriding reaction. The Ni d z 2 orbit and H s orbit accept the electrons and combine together compactly, while the Ni d xy orbit is half-occupied. The catalytic effect of Ni on H 2 dissociation can be ascribed to the bridging effect of Ni d xy orbit. The incorporation of C can weaken the over-strong interaction between Ni and H which hindered the H diffusion on Mg(0001). The Ni/C co-incorporated Mg(0001) shows the best performance during hyriding reaction compared with the clean and single incorporated Mg(0001).
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Qiangqiang Xue,Zhengwen Li,Zhao Jiang,Meng Chen,Yujun Wang,Binhang Yan,Guangsheng Luo
Steam reforming (SR) is a process for converting transportation fuels into hydrogen-rich gas, which can be fed to SOFCs for on-board power supplies. Herein, we prepare Mg x Ni 1-x O (0.5
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