JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Qiuyue Wang,Xiaofen Wu,Ji Huang,Siyi Chen,Yang Zhang,Chengjun Dong,Gang Chen,Lihong Wang,Hongtao Guan
With rapid advances in the portable electronics industry, the creation of microwave absorbing materials with high-performance to dissipate the unwanted electromagnetic wave is an important prerequisite. Herein, unique ternary organic-inorganic composites (C/Ni/PPy) were fabricated by hydrothermal method combined with in-situ polymerization approach. The correlation between structure, components, and microwave absorption capability is investigated in detail. The carbon matrix was prepared through a typical “carbonization-activation” procedure. Then, the PPy particles were decorated on the surface of the biomass carbon matrix incorporated with Ni particulates via an in-situ polymerization method. The microwave absorbing results suggest that the C/Ni/PPy ternary composites exhibit stronger dielectric loss and microwave absorption capabilities than C/PPy binary composites. A reflection loss of − 42.09 dB and an outstanding effective absorption bandwidth of 5.24 GHz are achieved simultaneously with a thickness of only 2.4 mm. The excellent microwave absorbing performances can be ascribed to the unique microstructure, enhanced polarization and the synergistic effects between dielectric loss and magnetic loss. The present work achieves a new paradigm to improve microwave absorption characteristics through the combination of dielectric components with magnetic materials. Furthermore, a prototype is proposed, which has broad application prospects for applications in next-generation wearable and portable electronics.
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高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 28
·9746-9753
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IF 4.39
Yan He,Tao Yu,Hui Wen,Rui Guo
For the electrocatalytic oxygen evolution reaction (OER) in alkaline media, there is an urgent need to optimize the adsorption strength of OH*. Here, a flower-like hybrid of Cr-doped FeOOH/Ni(OH)2 was used as an OER catalyst with a low overpotential of 291 mV at 50 mA cm−2. The results showed that faster charge transfer was achieved at the electrode/solution interface during the OER process after the FeOOH/Ni(OH)2 was modified by Cr, which facilitates the rate-determining step of the Volmer reaction. Furthermore, the results of faradaic efficiency and X-ray photoelectron spectroscopy (XPS) measurements confirmed that the synergistic effect between the ternary metal and oxygen vacancies led to excellent OER performance. This work provides a new strategy for the preparation of high-efficiency and low-cost oxygen evolution electrocatalysts.
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高影响因子
ENERGY CONVERSION AND MANAGEMENT
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2021
·
IF 9.709
Wen Tang,Jing-Pei Cao,Zhi-Hao Wang,Zi-Meng He,Tian-Long Liu,Ze-Ying Wang,Fei-Long Yang,Jie Ren,Xiao-Yan Zhao,Xiao-Bo Feng,Hong-Cun Bai
The development of cheap and highly dispersed nano-catalyst is one of the key technologies for low temperature steam reforming (SR) of biomass tar. This work used acid-washed and oxidized Shengli lignite char (OXAWSL) as carbon precursor to load Co (Co/OXAWSL) and Ni (Ni/OXAWSL) via ion exchange method to SR of toluene and biomass tar. The Co/OXAWSL was more active and stable than Ni/OXAWSL during the 30 h test with a final toluene conversion of 85% at a relatively low temperature of 450 °C and steam to carbon ratio (S/C) of 3.4, which resulted from its small particle size (5.6 nm) and high dispersion (12.3%) of Co. The relatively high H 2 production (42.59 mmol/g-biomass) over Co 0.1 /OXAWSL (450 °C, S/C = 3.4) in SR of tar was also obtained. A low E a (22.0 kJ/mol) value of Co/OXAWSL and good affinity to oxygen for Co explained its excellent performance. The low-temperature tar cracking process can provide theoretical and technical support for the large-scale industrial utilization of biomass pyrolysis and gasification.
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高影响因子
LANGMUIR
·
2021
·
IF 3.882
Yu Wang,Jia Chen,Ming Guan,Hongdeng Qiu
An iron–nickel bimetallic oxide porous graphene composite material (Fe/Ni-PG) was prepared by a simple partial combustion method, which can be used to effectively remove sulfonamides (SAs) from an aqueous solution. The adsorption performance of Fe/Ni-PG, Fe-PG, and Ni-PG on six kinds of SAs was compared, and the influence of time, temperature, pH, and initial concentration of SAs on the adsorption behavior of SAs of Fe/Ni-PG in an aqueous solution was studied. The adsorption kinetics and thermodynamics exhibited that the Langmuir model and pseudo-second-order kinetics model can describe the adsorption isotherm and kinetics. The maximum adsorption capacities of sulfadiazine (SD), sulfamerazine (SM), sulfamethazine (SDM), sulfathiazole (STZ), sulfapyridine (SPD), and sulfisoxazole (SIZ) calculated by the Langmuir model were 26.3, 50.3, 42.2, 27.3, 34.5, and 41.7 mg/g, respectively, which exceeded those of most reported adsorbents. In the adsorption process, hydrogen bonding, π–π electron donor–acceptor, electrostatic interaction, and bimetallic synergies play a major role, and the entire adsorption process is spontaneously endothermic. In addition, the material has excellent stability, and the Fe/Ni-PG after desorption is consistent with the raw material. This work provides a favorable way for the removal of SAs in the environment.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Dongting Wu,Aiqun Kong,Wei Li,Yan Fu,Jinli Zhang
Bimetallic Ni–Fe phosphide electrocatalysts were in-situ synthesized through direct phosphorization of metal salts on carbon cloth (CC). The Fe dopant remarkably enhances the OER performance of Ni 2 P in alkaline medium through the electronic structure modulation of Ni. The (Fe 0.5 Ni 0.5 ) 2 P/CC electrode, composed of uniform films coated on carbon fibers, delivers a low overpotential of 260 mV with a small Tafel slope of 45 mV·dec −1 at the current density of 100 mA cm −2 , outperforming most reported non-noble electrocatalysts and commercial RuO 2 electrocatalyst. The (Fe 0.5 Ni 0.5 ) 2 P/CC also displays superior electrochemical stability at high current density . An appropriate Fe dopant level facilitates the in-situ transformation of Ni–Fe phosphides into active NiFeOOH during alkaline OER. This work simplifies the synthesis procedure of metal phosphides.
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APPLIED SURFACE SCIENCE
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2021
·
IF 6.707
Ya-yun Li,Qiuming Zou,Zhangjian Li,Dong Xie,Yuan Niu,Jizhao Zou,Xierong Zeng,Junfeng Huang
Bimetallic electrocatalysers have attracted dramatic attentions in recent years owing to their unique electronic configuration, charge transfer efficiency and synergistic effect. Ni-Fe based alloys are considerable as one of the most promising materials with superior electrocatalytic performance since the outstanding oxygen reaction activity of iron and the strong capability of nickel. Herein, Ni-Fe MOF derived Ni-Fe alloys embedded graphitic carbon electrocatalyst is synthesized as bifunctional oxygen electrocatalyst with hierarchical porous structure and superior oxygen reaction electrocatalytic performance. The onset potential and the half-wave potential of Ni 0.6 Fe 0.4 CM in oxygen reaction are 0.88 V and 0.75 V, respectively, which are superior than those of commercial Pt/C. Furthermore, a low overpotential of 320 mV at 10 mA/ cm 2 is obtained in oxygen evolution reaction, which is well consistent with that of commercial RuO 2 . In the meantime, excellent long-term stability and anti-methanol ability endow Ni 0.6 Fe 0.4 CM exhibiting brilliant electrocatalytic performance as commercial Pt/C and RuO 2 . The assembled Zn-air battery exhibits smaller voltage gap (0.76 V) than that for commercial Pt/C and RuO 2 , and it has remarkable stability around 170 cycles in the discharge–charge test. These results summarize the merits of bimetallic electrocatalysers for bifunction electrochemical performance and promote the development of electrocatalytic applications.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 21
·48734
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IF 2.188
Jinfeng Cui,Yabin Zhang,Lurong Wang,He Liu,Niannian Wang,Baoping Yang,Junhong Guo,Li Tian
Two novel Salen-DPCPs metal complexes (Salen-DPCP-1 and Salen-DPCP-2), containing both Salen-Schiff base (Salen), phenyl phosphate structures (DPCP) and nickel component, were prepared to reduce fire hazards of epoxy resin (EP). The results showed that 5 wt % addition of Salen-DPCP-1 brought a higher flame-retardant efficiency to the EP, where the V-0 rating in UL-94 burning test and 31.5% of limiting oxygen index (LOI) were achieved. Meanwhile, total heat release, total smoke production, and total CO yield dramatically decreased by 28.1, 23.6, and 21.4%. In addition, these results basically reappeared when Salen-DPCP-2 were introduced into EP to obtain Salen-DPCP-2/EP composites. Chemical structure and morphology characterization of the carbon residue confirmed that Salen-DPCPs improved the catalytic charring ability and the noncombustible gas releasing ability by the Fourier transform infrared, X-ray photoelectron spectroscopy, and Scanning electron microscopy technology. Therefore, it is an efficient strategy to develop novel Salen composites modified by flame-retardant groups to improve the fire rating of polymers. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48734.
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JOURNAL OF SOLID STATE CHEMISTRY
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2019
·
IF 2.291
Xiangping Li,Han Yin,Jianguang Zhang,Juping Liu,Guanyi Chen
Template removing approaches can significantly impact the physiochemical properties of mesoporous molecular sieve materials. In order to better understand the relationship between template removing approaches and the properties of Ni/Al-SBA-15, four kinds of template removing approaches were introduced to remove the organic template from Al-SBA-15, respectively. The structural characteristics of these materials were analyzed by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray fluorescence (XRF), powder X-ray diffraction (XRD), N 2 -sorption, Fourier transform infrared spectra (FT-IR), infrared spectra of pyridine adsorption (Py-FTIR), magic angle spinning-nuclear magnetic resonance (MAS-NMR), X-ray photoelectron spectroscopy (XPS) and gas chromatography-mass spectrometry (GC-MS). Ni/Al-SBA-15 of which the organic template was removed by two-step calcination method had the maximum specific surface area (619 m 2 /g). In contrast, Ni/Al-SBA-15 of which the organic template was removed using solvent extraction approaches had the lowest specific surface area (555 m 2 /g). The mesopore diameter of Ni/Al-SBA-15, using electric heating digestion method to remove the template, was significantly increased and the wall thickness was significantly decreased to 11.62 nm in comparison with the other samples. The selectivity of products during the process of eugenol hydrodeoxygenation was investigated. High hydrocarbons were obtained during catalytic hydrodeoxygenation over Ni/Al-SBA-15 of which the organic template was removed by using solvent extraction approaches. Compared with direct calcination process, two-step calcination was more effective in removing template and the corresponding catalyst was much more suitable for the hydrodeoxygenation process.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Aijuan Xie,Jie Zhang,Xiang Tao,Jianghui Zhang,Bingyan Wei,Wenhao Peng,Yuwei Tao,Shiping Luo
Nickel-based metal organic framework materials were first prepared by hydrothermal method and used as the precursor. Ni/nitrogen-carbon (Ni–N–C), Ni@NiO–N–C and NiO–N–C mixtures derived from metal organic skeleton were successfully prepared by controlling the heat treatment conditions and applied in the electrocatalytic oxygen evolution reaction (OER). Through a series of research of OER catalytic performance, OER process kinetics, and stability, the as-prepared Ni @ NiO/N–C nanowires (NW) (250 °C) with core-shell structure showed the most prominent activity. Compared with other derived mixed materials, the oxygen evolution overpotential was 390 mV at the current density of 10 mA cm −2 , and the Tafel slope was 100 mV dec −1 . Moreover, the material showed excellent stability without significant decrease of activity after a long time of testing. The detail study regarding the formation and evolution of Ni/NiO NWs is of considerable value and may offer prospects for developing highly active electrocatalysts in electrochemical energy devices.
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RSC Advances
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2020
·Vol. 10
·期 3
·1769-1775
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IF 3.119
Wenzhe Ma,Yanjing Yang,Fengqi Zhao,Kangzhen Xu,Jiankan Zhang,Ming Zhang,Zhicun Feng
The development of novel combustion catalysts is critical for improving combustion performance of high-energy solid propellants. In this work, a nickel-based Schiff base complex, N,N′-bis(salicylidene)ethylenediamino nickel [Ni(Salen)], as a candidate for the combustion catalyst of solid propellants, was synthesized with high purity. The effects of Ni(Salen) on the thermal decomposition reaction of FOX-7, which is closely related to its combustion properties in propellants, were systematically investigated and the corresponding mechanisms were also evaluated through comparison and analysis. Under the action of Ni(Salen), peak temperatures of the two decomposition processes of FOX-7 were reduced from 235.7 and 296.3 °C to 233.7 and 268.7 °C, respectively. The investigations into the mechanisms revealed the interactions between the Schiff base skeleton in Ni(Salen) and FOX-7, which promotes the decomposition of the remaining FOX-7. In addition, it was found that NiO, which was a decomposition product of Ni(Salen), also played an important role in promoting the thermal decomposition of FOX-7.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 23
·期 11
·3031-3041
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IF 2.531
Deng Yafeng,Ma Zhanhong,Ren Fengzhang,Wang Guangxin
In spite of the TiO 2 compact layer (TCL) being widely used, it still needs more study. This paper took Ni-doped TCLs as the research target, using an innovative two-step method perfectly prepared Ni-doped TCLs with different thicknesses. And then on the basis of Ni-doped TCLs, the TiO 2 nanorod array (TNA) films were successfully prepared. The effects of Ni-doped TCLs with different thicknesses on the morphology, structure, and photoelectric performance of TNA films were investigated. The results indicated that Ni-doped TCLs with appropriate thickness can significantly improve performance of TNA films and obtain satisfactory PCE stability with time. Compared with the TNA films based on Ni:TCL5, Ni:TCL10, and Ni:TCL30, the TNA film with Ni:TCL20 exhibited better comprehensive photoelectric performance, the DSSCs based on this TNA film achieved the highest J sc (10.191 mA cm −2 ), V oc (0.574 V), PCE (4.42%), and the most excellent PCE stability with time.
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Catalysis Science & Technology
·
2019
·Vol. 10
·期 1
·263-267
·
IF 5.726
Gang Yuan,Yujie Hu,Zihan Wang,Qiwei Wang,Li Wang,Xiangwen Zhang,Qingfa Wang
Water oxidation plays a pivotal role in energy conversion and storage such as in water splitting and metal-air batteries. The development of a highly active and stable electrode for water oxidation at a low price is greatly challenging. Here, we report a self-supported oxygen evolution reaction (OER) electrode with a 3D porous Ni foam (NF) as a core and a dense layer of amorphous phosphorus-doped Ni hydroxide (Ni–OH/P) film as a shell. This facilely fabricated 3D core–shell structured electrode with directly grown active materials offered improved activity and prolonged stability for OER. It required an overpotential of 490 mV to deliver a current density of 100 mA cm−2; it showed a small Tafel slope at 87 mV dec−1 and sustained elongated electrolysis at 100 mA cm−2 for 100 h. The NiOOH shell was in situ formed on the surface of the Ni–OH/P film. Then, a new core–shell structured film was constructed. The synergetic effects of the newly formed crystalline NiOOH shell and amorphous Ni–OH/P core contributed to high stability under harsh conditions. This work presents a facile and easy scale-up path to develop self-supported hybrid electrodes for efficient and stable energy conversion and storage.
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