Batteries-Basel
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2023
·Vol. 9
·期 7
·361
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IF 4
Haoyu Tian,Lingyu Zhao,Linlin Wang,Zijie Xia,Wenqi Tan,Zheng Jiao
It continues to be a challenge to design innovative NiCoP composite anode materials to further improve rate capacity. In this work, bimetallic flower-like NiCoP encapsulated in an N-doped carbon shell (designated as NiCoP@NC) as a high-rate capable anode material for lithium-ion batteries (LIBs) was successfully designed and synthesized. The novel structure design combines the advantages of flower-like NiCoP (core) and N-doped carbon (shell). Flower-like NiCoP offers numerous interface and redox reaction sites for improving lithium storage, while the N-doped carbon shell effectively buffers volume expansion and enhances electrical conductivity. The synergistic effect between NiCoP and the N-doped carbon shell proposes a marvelous high-rate capacity (320 mA h/g even at 5 A/g) and a good cycle life with high reversible capacity (369.8 mA h/g for 700 cycles at 3 A/g with 81% retention). An investigation of kinetics performance shows that the introduction of the N-doped carbon shell enhances the charge transfer, and the pseudocapacitive behavior dominates the rapid Li+storage of the NiCoP@NC electrode.Keywords:Li-ion batteries (LIBs);anode materials;transition bimetal phosphide;N-doped carbon shell
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FUEL
·
2023
·
IF 7.4
Bo Wang,Wenrui Yan,Xianlong Gong,Quan Zhu
Coking during the endothermic hydrocarbon fuel pyrolysis is a key issue that needs to be solved in the development of regenerative cooling technology for high-speed aircrafts. The compounds containing hydroxyl groups are developed to inhibit coking by regulating coking pathway during the thermal cracking of hydrocarbon fuels. Pyrolytic deposition experiments of n -decane with additives were performed using the method of electrical heating. The anti-coking performance of the additives was characterized by means of gas chromatograph–mass spectrometer (GC–MS), scanning electron microscopy (SEM), temperature programmed oxidation (TPO) and Raman spectroscopy. The results showed that the degree of cracking is reduced at low fuel temperature due to the dilution of the additives, and the additives do not affect the fuel cracking as the fuel temperature increased. With the function of additives, the masses of filamentous and amorphous coke were decreased. A possible mechanism for the additives inhibiting coking has been proposed. The additives containing hydroxyl groups can block the initial coking reaction path to inhibit coking at the source. In general, the hydroxyl radicals released by the additives oxidize the coking precursors to prevent its further growth, and react with the substrate to form particulate matters serving as passivation coating, inhibiting the bulk phase coking and metal catalytic coking simultaneously. This work provides significant ideas for inhibiting coking by regulating coking reaction pathways.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xianguang Zeng,Lin Zhu,Xingwen Zheng
The inhibitive effect of N-lauroyl L-lysine on the corrosion of mild steel in 0.5 M H 2 SO 4 solution was investigated by electrochemical technique, weight loss measurement, scanning electron microscope (SEM) and quantum chemical calculation. The results showed that N-lauroyl L-lysine was a moderate cathodic inhibitor for mild steel in 0.5 M H 2 SO 4 solution with its inhibition efficiency increasing with concentration, and decreasing with temperature. The adsorption of N-lauroyl L-lysine on the surface of mild steel obeyed El-Awady thermodynamic-kinetic model, and the thermodynamic and kinetic parameters, as well as quantum chemical parameters, were determined to discuss the mechanism of inhibition of N-lauroyl L-lysine on mild steel surface.
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VIBRATIONAL SPECTROSCOPY
·
2023
·
IF 2.5
Liwei Ni,Shiying Yang,Wenze Qiu,Jialei Jin,Qiyue Xu,Shuliang Ye
The reaction pathway of many Paal-Knorr reactions for pyrrolic compounds hasn’t been thoroughly studied and remains controversial. In this work, the synthesis of an important anti-ultraviolet agent N-butoxycarbonyl-2,5-dimethylpyrrole based on the Paal-Knorr reaction was studied via in-situ Fourier transform infrared (FTIR) analysis combined with density functional theory (DFT) calculation. The online spectral data were analyzed using K-means clustering in order to find the characteristic wavenumbers of intermediates. It was found that the reaction with 2,5-hexadione and butyl carbamate are more favorable to form the imine and enamine intermediates by nucleophilic addition, which is different from another Paal-Knorr reaction with 2, 5-hexadione and ethanolamine . In addition, the reaction kinetic model was established through chemometric methods, with parameters of two rate-limiting reaction steps calculated. This approach of FTIR analysis is proven to be an effective tool for mechanism study of organic synthesis.
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Polymers
·
2023
·Vol. 15
·期 13
·2918
·
IF 5
Cheng Tang,Tao Hu,Chengzhen Du,Ziqin Liao,Wenyan Cheng,Fen Wang,Xiaoli Hu,Kunpeng Song
A Fe-N conjugated organic polymer (SMP-Fr-Py) was prepared from ferrocene and pyrrole using a Scholl coupling reaction, which significantly improved the performance of Cr(VI) removal compared to the polymer (HCP-Fr-Py) prepared by adding the cross-linker formaldehyde dimethyl acetal (FDA). The results showed that at a pH of 2 and at 25 °C, the removal of Cr(VI) reached 90% for SMP-Fr-Py and only 58% for HCP-Fr-Py after 20 min of reaction. Subsequently, 99% and 78% were achieved after 120 min of reaction, respectively. The test results showed that the removal reaction followed a pseudo-second-order kinetic model. The removal efficiency decreased with increasing solution pH and initial Cr(VI) concentration, but increased with increasing SMP-Fr-Py dosage, reaching three cycles. The characterization of the reaction complexes and measurements of Cr species conversion revealed the near absence of Cr(VI) species in the solution. Approximately 38% of Cr(VI) was found to be adsorbed on the material surface, with another fraction present in solution (24%) and on the material surface (38%) in the form of Cr(III). The overall study showed that the direct connection of ferrocene and pyrrole in SMP-Fr-Py through C-C bonding increased the conjugated structure of the polymer backbone, which facilitated electron transfer and transport. Furthermore, the Fe-N elements worked synergistically with each other more easily, which improved the removal performance of Cr(VI) and provided a reference for the subsequent work.Keywords:organic polymers;Fe-N co-doping;Cr(VI) removal;conjugate structure
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Journal of Energy Storage
·
2023
·
IF 9.4
Xiuli Huang,Wei Chen,Huan Liu,Shi Li,Wangwang Zhang,Yiming Ren,Rongli Zhang,Maodong Xu,Jiang Zhu
The couple of supercapacitors' high power density and batteries' high energy density endows aqueous zinc-ion hybrid supercapacitors (ZIHSCs) a perspective candidate for next-generation energy storage devices. Biomass-derived hierarchical porous carbon with excellent wettability towards aqueous electrolyte is regarded as a promising cathode for ZIHSCs applications. Herein, a N/O co-doped hydrophilic carbon with hierarchical porous architecture is conversed from protein enriched recycled badminton feathers via a facile and scalable strategy. The resultant carbon presents hierarchical porous architecture with high surface area and mesopore-governed pore size distribution, rich dual-doping of N/O heteroatoms and good water wetting behavior. The all-round teamwork of these unique properties provides numerous interfacial active sites plus extra reversible redox reaction for high energy density, and speedy kinetics for high power density. Incredibly, as-assembled ZIHSC device displays an ultrahigh capacity of 225.3 mAh g −1 at 0.1 A g −1 with an appreciable capacity retention of 73.8 mAh g −1 even at a 1000-fold amplified current density, thereby delivering admirable energy and power densities of 201.4 Wh kg −1 and 83.6 kW kg −1 . Most satisfyingly, an ultralong cycling life with no loss in capacity is achieved after 40,000 cycles even at 50 A g −1 . Therefore, by taking advantage of its intrinsic component, the conversion of biomass waste to high performance carbon-based cathode material holds a broad prospect and practical significance.
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APPLIED PHYSICS LETTERS
·
2023
·Vol. 123
·期 8
·
IF 4
Zhang Qianwen,Wu Huaxiong,Du Yuxiang,Zhang Minghui,Xu Bangqiang,Chen Genqiang,He Shi,Zhang Dan,Li Qi,Wang Hong-Xing
In this study, Au nanoparticles were introduced to functionalize hydrogen-terminated diamond (H-diamond) to optimize surface modification and improve the performance of diamond sensor for trace detection of SARS-CoV-2 N-protein. The Au nanoparticles were obtained by an electron beam evaporation system and annealing. Atom force microscope and scanning electron microscope were utilized to characterize the structure, morphology, and distribution of fabricated Au nanoparticles. The concentration of SARS-CoV-2 N-protein was determined by the investigation of transfer characteristics of a diamond solution gate field effect transistor. Sensitivity of this sensor was obtained as 27.43 mV/lg (N-protein concentration), which was higher than a regular H-diamond sensor. In addition, it had a wider linear detection range of 10 −15 –10 −5 mg/ml and a lower limit of detection of 10 −15 mg/ml. Accordingly, the detection performance of diamond sensor has been greatly improved due to the functionalization of Au nanoparticles.
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DALTON TRANSACTIONS
·
2023
·Vol. 53
·期 3
·917-931
·
IF 4
Shuyan Li,Mingxuan Sun,Xiangzhi Huang,Haohao Chen,Junjie Zhao,Ziyang Li
In this work, N-graphyne is in situ coupled with BiOCl0.5Br0.5via a facile one-step sonochemical method. To our knowledge, both the synthesis strategy for BiOCl0.5Br0.5 and the N-graphyne/BiOCl0.5Br0.5 photocatalytic system are new developments. A collection of characterization methods is adopted to detect the morphologies, structures, and electronic and optical properties. The results demonstrate that wrinkle-like N-graphyne nanosheets successfully enwind around or on flower-like BiOCl0.5Br0.5 microspheres, which are regularly assembled by BiOCl0.5Br0.5 nanosheets. Compared with pristine BiOCl0.5Br0.5, N-graphyne/BiOCl0.5Br0.5 composites exhibit superior adsorption capacity and visible-light-driven photocatalytic degradation of levofloxacin. In particular, the optimal N-graphyne amount for ameliorating the photocatalytic performance of BiOCl0.5Br0.5 is ascertained. In addition, the good stable performance for photocatalysis is confirmed by four cycling experiments. The dominant active species is confirmed to be O2˙− during photodegradation. The improved photocatalytic activity is attributed to the enhanced visible light response and the accelerated transfer/separation of photogenerated carriers by N-graphyne, which are verified using UV–vis absorption spectra, photocurrents, photopotentials, Nyquist plots, and Mott–Schottky curves. This study develops a new perspective for the synthesis and modification of BiOX solid solution, which can be used as an efficient photocatalyst.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Han Ding,Zhihao Sun,Shaoyao Tian,Peng Wang,Zihao Guo,Yu Qiu,Benli Du,Lei Qian
Bimetallic transition carbide nanoparticles (Ni 3 ZnC 0.7 ) encapsulated with graphitic shells were successfully embedded into N-rich laminated porous carbon nanosheets (NC–ZnNi 1.5 ) by one-step pyrolysis of bimetallic organic frameworks. It was found that C atoms penetrated octahedral interstitial spaces of the Ni lattice to form Ni 3 ZnC 0.7 . The charge states and distribution of metal atoms were influenced by the interstitial C atoms, which promoted polarization relaxation and facilitated dielectric loss. Simultaneously, the volatilization of Zn influenced recrystallization and rearrangement of the crystalline domains, facilitated graphitization and established a 3D conductive network to optimize the conductive loss. Besides, multi-level heterogeneous interface and nitrogen doping also further optimized the impedance matching. Benefiting from these advantages, the minimum reflection loss of NC-ZnNi 1.5 was −69.1 dB at 12.7 GHz, and the effective absorption bandwidth was 6.5 GHz. The mechanism of bimetallic carbide's dielectric loss was explained in detail, providing a new pathway for the development of multi-component carbon-based microwave absorbers in the future.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Li Du,Xiang Yu Gao,Zhu Li,Guo Yong Wang,Zi Wen,Chun Cheng Yang,Qing Jiang
Metal/carbon-based materials derived from metal-organic frameworks have recently attracted great attention for oxygen reduction reaction (ORR) electrocatalysts , but poor electrical conductivity and insufficient stability owing to granular structures, as well as low production hinder their practical applications. Herein, we design and synthesize Co nanoparticles decorated on N-doped carbon nanonecklaces (Co/N-CNNs) by way of electrospinning and following carbonization . The Co/N-CNNs hybrid exhibits excellent ORR performance with a positive half-wave potential (0.865 V) and a large limiting current density (5.35 mA cm −2 ), even comparable to those of Pt/C. Such superior electrocatalytic properties are attributed to the distinctive necklace-like structure, which supplies high specific surface area, hierarchical porous structure , well-dispersed and covered Co nanoparticles, and hierarchical architecture of N-doped carbon. This work provides an effective strategy to fabricate ORR electrocatalysts with well-designed structure and mass production via electrospinning.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Qing Xu,Linlin Zang,Ziying Li,Fengtong Shen,Yanhong Zhang,Liguo Sun
As a new generation of non-precious metal catalysts , nickel phosphide is regarded as an ideal substitute for precious metal platinum in electrochemical hydrogen evolution . Here, a hydrogen evolution reaction (HER) electrocatalyst is developed by in situ growth of Ni 2 P/Ni 5 P 4 heterostructures on porous N decorated rGO foam (named Ni 2 P/Ni 5 P 4 /N-rGO). The porous rGO foam structure provides a larger surface area and abundant active sites. The Ni 2 P/Ni 5 P 4 nanoparticles with heterostructures are uniformly distributed on the rGO sheet, which enhance the charge transfer ability. The decorating of N element also correspondingly improves the HER performance. The as-prepared Ni 2 P/Ni 5 P 4 /N-rGO exhibits excellent HER performance in alkaline medium . When the current density is 10 mA cm −2 , the overpotential is only 22 mV. No obvious loss of HER activity after 2000 cyclic voltammetry indicates that the composite has excellent stability. This work presents a valuable route for fabricating inexpensive and high-performance catalysts for electrocatalysis .
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CATALYSIS TODAY
·
2022
·
IF 6.562
Linhao Yu,Hong Chen,Yingying Li,Zhe Wen,Yongdan Li
The metallic cobalt supported on nitrogen dopped carbon material was employed as an efficient catalyst in the oxidative esterification of 5-hydroxymethylfurfural (HMF) to furan-2,5-dimethylcarboxylate (FDMC). The carbonization temperature has a significant effect on the morphology and structure of Co/N-C samples. The Co/N-C calcined at 900 °C exhibits the best catalytic performance and a 73.8% FDMC yield at 91.7% HMF conversion is measured at 130 °C for 20 h with K 2 CO 3 under 1 MPa O 2 . The catalytic activity of Co/N-C was benefited by the synergistic effect between the metallic cobalt and nitrogen-doped carbon material. The reaction mechanism of FDMC formation was proposed.
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