المؤلفون: Xie, Chong, Xu, Quan, Maleki Kheimeh Sari, Hirbod, Li, Xifei

المصدر: Chemical Communications; 6/25/2020, Vol. 56 Issue 50, p6770-6773, 4p

مصطلحات موضوعية: ANODES, COLLOIDS, NANOPARTICLES, MICROSPHERES, CARBON

مستخلص: Si/C microsphere anodes with well-designed structures were successfully synthesized via the polymerization-induced colloid aggregation (PICA) method. The voids and void-holes in the carbon framework provide the direct and elastic buffer space for volume expansion of Si nanoparticles, respectively. This anode exhibits an outstanding structural integrity and enhanced cycling stability. [ABSTRACT FROM AUTHOR]

: Copyright of Chemical Communications is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Jia, Nan, Liu, Jing, Gao, Yunshan, Chen, Pei, Chen, Xinbing, An, Zhongwei, Li, Xifei, Chen, Yu

المصدر: ChemSusChem; 7/19/2019, Vol. 12 Issue 14, p3390-3400, 11p

مصطلحات موضوعية: ZINC electrodes, CARBON nanotubes, OPEN-circuit voltage, NANOPARTICLES, OXYGEN evolution reactions, STANDARD hydrogen electrode

مستخلص: An inexpensive and efficient bifunctional electrocatalyst for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is central to the rechargeable zinc–air battery. Herein, a nanohybrid, in which N,S‐codoped carbon nanotubes were decorated with Co9S8 nanoparticles encapsulated in porous graphene layers, was fabricated by a one‐step heat‐treatment process. The N,S dopant species were the major active sites for the ORR, and Co9S8 nanoparticles were mainly responsible for the OER. Compared with commercial 20 wt % Pt/C and Ir/C electrocatalysts, this nanohybrid exhibited a comparable ORR half‐wave potential (0.831 V vs. reversible hydrogen electrode) and OER potential (1.591 V at 10 mA cm−2), better long‐term stability in an alkaline medium, and a narrower potential gap (0.76 V) between ORR and OER. Furthermore, as air electrode of the rechargeable zinc–air battery, it delivered a low charge–discharge voltage gap (0.65 V at 5 mA cm−2), high open‐circuit potential (1.539 V), good specific capacity (805 mA h g-1Zn at 5 mA cm−2), and excellent cycling stability (48 h), superior to those of commercial Pt/C and Ir/C catalysts, and thus showed promise for applications in renewable energy conversion devices. [ABSTRACT FROM AUTHOR]

: Copyright of ChemSusChem is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Yu, Zhuxin¹, Li, Xifei^1,2,3 xfli2011@hotmail.com, Yan, Bo¹, Xiong, Dongbin¹, Yang, Mei¹, Li, Dejun¹

المصدر: Materials Research Bulletin. Dec2017 Part 4, Vol. 96, p516-523. 8p.

مصطلحات موضوعية: *SODIUM ions, *ELECTRIC conductivity, *GRAPHENE oxide, *NANOPARTICLES, *COMPOSITE materials

مستخلص: SnS 2 as an anode material for sodium ion batteries (SIBs) reveals poor battery performance due to huge volume change and poor electrical conductivity. To address these problems, reduced graphene oxide coated flower-like SnS 2 (SnS 2 @rGO) was successfully designed for SIBs by virtue of a facile hydrothermal approach. For SnS 2 @rGO, a high specific capacity of 649 mAh g −1 is obtained at 50 mAh g −1 . After 100 cycles, a discharge capacity of 509 mAh g −1 is maintained. It turns out that the resistance of SnS 2 @rGO remains stable while that of the bare one increases with the growth of cycle. The improved performance can be attributed to the graphene, which can suppress the agglomeration of SnS 2 nanoparticles, enhance the conductivity of SnS 2 , and increase its structural stability during cycling. This study is a potent testimony to the property of SnS 2 @rGO composite that it is a promising anode material ideal for high performance SIBs. [ABSTRACT FROM AUTHOR]

المؤلفون: Song, Haoze¹, Li, Xifei¹ xfli2011@hotmail.com, Cui, Yanhua², Xiong, Dongbin¹, Wang, Yufen¹, Zeng, Jiesheng¹, Dong, Litian¹, Li, Dejun¹ dejunli@mail.tjnu.edu.cn, Sun, Xueliang^1,3

المصدر: International Journal of Hydrogen Energy. Nov2015, Vol. 40 Issue 41, p14314-14321. 8p.

مصطلحات موضوعية: *LITHIUM, *TIN oxides, *ANODES, *PARTICLE size distribution, *NANOPARTICLES, *CRYSTAL morphology

مستخلص: The SnO 2 anode materials with various nanoparticle sizes were successfully synthesized to study their size effects on lithium storage performance. The compositions, structures, particle sizes and morphologies of the as-prepared samples were characterized by X-ray diffraction (XRD), Raman spectra, X-ray photoelectron spectroscopy (XPS), Scanning electron microscope (SEM) and high resolution transmission electron microscopy (HRTEM) techniques. It was confirmed that the obtained nanomaterials via a facile reflux approach show smaller size than that of hydrothermal method. Using cyclic voltammograms, electrochemical impedance spectroscopy, and galvanostatical charge/discharge testing, the SnO 2 anodes with different nanoparticle sizes exhibit various electrochemical performance with lithium, originating from the enormous volume changes associated with the alloying and de-alloying processes. It was demonstrated that the anode material with smaller nanoparticle size performs much better lithium storage performance. [ABSTRACT FROM AUTHOR]

المؤلفون: Li, Minsi¹, Li, Xifei² xfli2011@hotmail.com, Li, Weihan¹, Meng, Xiangbo³, Yu, Yan¹, Sun, Xueliang^2,3

المصدر: Electrochemistry Communications. Aug2015, Vol. 57, p43-47. 5p.

مصطلحات موضوعية: *TITANIUM dioxide films, *ATOMIC layer deposition, *AMORPHOUS substances, *GRAPHENE, *LITHIUM-ion batteries, *NANOPARTICLES

مستخلص: Composites consisting of graphene nanosheets (GNSs) decorated with amorphous TiO 2 thin films were synthesized by an atomic layer deposition (ALD) technique. It was revealed that the TiO 2 thin films were uniformly deposited onto the worm-like GNSs. When used as anode materials in lithium ion batteries (LIBs), the TiO 2 –GNS composites deliver a stable capacity of ~ 140 mAh g − 1 after 100 cycles at a specific current of 100 mA g − 1 as well as superior rate capability, accounting for a sustainable 95 mAh g − 1 capacity at a specific current of 1200 mA g − 1 . It is believed that the remarkable electrochemical performance lied in the unique features of the composites, i.e., the amorphous nature of the TiO 2 films and the large surface area of GNSs. The former rendered short Li + diffusion pathways in TiO 2 thin film, while the latter offered excellent electronic conductivity as well as a large intimate contact area between the electrolyte and TiO 2 . This work laid a venue for designing new electrodes for high-performance LIBs. [ABSTRACT FROM AUTHOR]

المؤلفون: Liu, Jian¹, Li, Xifei¹, Yang, Jinli¹, Geng, Dongsheng¹, Li, Yongliang¹, Wang, Dongniu¹, Li, Ruying¹, Sun, Xueliang¹ xsun@eng.uwo.ca, Cai, Mei², Verbrugge, Mark W.²

المصدر: Electrochimica Acta. Feb2012, Vol. 63, p100-104. 5p.

مصطلحات موضوعية: *LITHIUM-ion batteries, *NANOSTRUCTURED materials synthesis, *ANODES, *NANOPARTICLES, *MICROWAVES, *SCANNING electron microscopy

مستخلص: Abstract: Nanoflower-like and nanoparticle spinel Li4Ti5O12 were synthesized by a microwave-assisted hydrothermal (MH) method following calcination. As-prepared Li4Ti5O12 was characterized by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction and cyclic voltammetry. The nanoflower-like and nanoparticle Li4Ti5O12 exhibited discharge capacities of 176.7 and 109.8mAhg−1, respectively, for the first cycle, and maintained reversible capacities of 138.4 and 91.7mAhg−1, respectively, at a 1.1 C-rate (200mAg−1) after 100 cycles. The better performance of nanoflower-like Li4Ti5O12 relative to nanoparticle Li4Ti5O12 is attributed to the larger specific surface area and shorter Li+ diffusion path of the former relative to the latter. The MH preparation process is straightforward and fast; thus it shows promise for widespread lithium ion battery applications. [Copyright &y& Elsevier]

المؤلفون: Lin, Qingxin^1,2 (AUTHOR), Qin, Jian^1,2,3 (AUTHOR) qinjian@xaut.edu.cn, Cao, Yanyan^1,2 (AUTHOR), Li, Xiaokang^1,2 (AUTHOR), Hong, Yan^1,2 (AUTHOR), Jin, Meichen^1,2 (AUTHOR), Dong, Jinjuan^1,2 (AUTHOR), Xiao, Wei^1,2 (AUTHOR), Li, Wenbin^1,2 (AUTHOR), Wang, Jingjing^1,2 (AUTHOR), Li, Xifei^1,2 (AUTHOR) xfli@xaut.edu.cn

المصدر: Chemical Engineering Journal. Oct2023, Vol. 474, pN.PAG-N.PAG. 1p.

مصطلحات موضوعية: *SODIUM, *POTASSIUM, *DENSITY functional theory, *SURFACE states, *NANOPARTICLES, *ENERGY storage

مستخلص: • SbBi x nanoparticles embedded in ultra-thin carbon networks are designed. • SbBi x @C exhibits excellent performance in both sodium and potassium storage. • The influence of proportion in SbBi x on energy storage behavior is revealed. • SEI composition and particle surface states play an important role in energy storage. The alloy proportions of SbBi x show obvious influence on sodium/potassium storage. Herein, SbBi x nanoparticles embedded in ultra-thin carbon networks (SbBi x @C, x = 1, 0.5, 0.15) are successfully synthesized by a facile salt template assisted pyrolysis method. The effect of different alloy proportions on the chemical and electrochemical properties of active materials is revealed. Density functional theory calculation demonstrates that SbBi 0.5 has the smallest formation energy (−5.131 eV) and the smallest volume expansion rate for both sodium/potassium storage (222%/376%). Benefiting from the optimized volume expansion for both sodium/potassium storage and carbon networks structure, the optimized SbBi 0.5 @C anode shows high reversible capacities of 301 mAh/g and 390 mAh/g after 100 cycles at 0.1 A/g for sodium/potassium storage, respectively. It is also observed that the SbBi 0.5 @C anode delivers different behaviours of sodium/potassium storage, which is due to the various composition of SEI films formed after sodium/potassium storage. It is believed that this work provides a synthetic strategy for fabricating alloy-type anode materials for SIBs/PIBs, in view of structure design and the regulation of alloy proportion. [ABSTRACT FROM AUTHOR]

المؤلفون: Zhou, Miao¹, Liu, Zhihua¹, Song, Qinggong², Li, Xifei³, Chen, Bowen¹, Liu, Zhifeng¹ tjulzf@163.com

المصدر: Applied Catalysis B: Environmental. May2019, Vol. 244, p188-196. 9p.

مصطلحات موضوعية: *PLATINUM, *PHOTOELECTROCHEMISTRY, *WATER electrolysis, *NANOPARTICLES, *HYDROTHERMAL synthesis

مستخلص: Graphical abstract Highlights • Edamame shaped ZnIn 2 S 4 film consisted of nanoflakes (2D) and nanoparticles (0D) on ITO substrate. • Design and fabricate a Co-Pi/ZnIn 2 S 4 /Pt photoanode for efficient PEC water splitting. • Edamame shaped ZnIn 2 S 4 nanostrctures contribute to enhanced light harvesting. • The spatial Co-Pi and Pt cocatalyst result in efficient reduced charge recombination at the surface and interface. • It can provide an avenue guidelines for photoelectrodes to realize efficient PEC water splitting. Abstract Charge separation and transport as well as light absorption are pivotal in determining the efficiency of solar water splitting devices. Herein, we have designed a novel edamame shaped ZnIn 2 S 4 nanostructures consisted of hybridized nanoflakes (2D) and nanoparticles (0D) on ITO conductive substrate through a simple hydrothermal method for PEC water splitting for the first time. The growth mechanism of 0D/2D ZnIn 2 S 4 is proposed and discussed in detail. The series of PEC measurements indicate that edamame shaped 0D/2D ZnIn 2 S 4 films exhibit relatively higher PEC activity (0.37 mA/cm2 at 1.23 V vs. RHE) than that of ZnIn 2 S 4 NFs and ZnIn 2 S 4 NPs due to the enhanced light absorption and efficient charge separation and transfer and increased active sites. Additionally, after selectively depositing Co-Pi cocatalyst and Pt NPs on the top and bottom sides of edamame shaped ZnIn 2 S 4 photoanodes, charge recombination at the surface and interface can be efficiently reduced. The spatial Co-Pi cocatalyst drives holes to flow to the surface, while the Pt NPs facilitate the electrons in the opposite directions. Thus, the integrated Co-Pi/ZnIn 2 S 4 /Pt equipment without any additional doping presents an increased photocurrent density with 0.91 mA/cm2 at 1.23 V vs. RHE. This work highlights that edamame shaped ZnIn 2 S 4 can be a promising candidate for photoelectrochemical behavior and rout such as coupling of Co-Pi and Pt co-catalysts on photoanodes have an interfacial electric field can provide a new avenues to design efficient PEC devices in future. [ABSTRACT FROM AUTHOR]

المؤلفون: Han, Yan^1,2,3, Zhang, Shu^1,2, Shen, Na^1,2, Li, Dejun^1,2 hanyan2664@mail.nankai.edu.cn, Li, Xifei^1,2 xfli2011@hotmail.com

المصدر: Materials Letters. Feb2017, Vol. 188, p1-4. 4p.

مصطلحات موضوعية: *SUPERCAPACITOR performance, *METAL-organic frameworks, *POROUS materials, *NICKEL oxide, *METAL nanoparticles

مستخلص: Porous NiO architecture has been successfully prepared by calcining a novel Ni-MOF in air. As revealed by XRD, SEM and TEM, the obtained NiO architecture is assembled from two-dimensional nanosheets, which primarily consist of uniform nanoparticles and large quantities of pores between nanoparticles. Electrochemical data present that the NiO architecture possesses a reversible specific capacitance of 324 F g −1 after 1000 cycles at 1 A g −1 , and nearly 46% capacity retention when the current density increases from 1 to 40 A g −1 , suggesting its promising application in supercapacitors. [ABSTRACT FROM AUTHOR]

المؤلفون: Yang, Huijuan¹ (AUTHOR), Zhang, Yuling¹ (AUTHOR), Xie, Chong¹ (AUTHOR), Yan, Cheng¹ (AUTHOR), Yi, Xiaoyu¹ (AUTHOR), Wang, Chunran¹ (AUTHOR), Li, Xifei¹ (AUTHOR) xfli@xaut.edu.cn

المصدر: Materials Letters. Oct2022, Vol. 324, pN.PAG-N.PAG. 1p.

مصطلحات موضوعية: *OXYGEN evolution reactions, *ELECTRON configuration, *QUANTUM dots

مستخلص: • 2.7 nm NiP amorphous quantum dots were prepared by metal-support interaction. • Fe/N/C support tunes the NiP quantum dots electron structure configuration. • Overpotential of 242 mV at 10 mA cm−2 and Tafel slopes of 47 mV dec−1 are achieved. Amorphous nickel phosphorus (NiP) is regarded as one of the most promising efficient catalysts for oxygen evolution reaction (OER). Here, amorphous NiP quantum dots with a diameter of 2.7 nm were successfully prepared by metal-Fe/N/C support interaction. Owing to the high specific surface areas, the abundant defects caused by N-doping, and the charge transfer between Fe single atoms and NiP, amorphous NiP quantum dots achieve a low overpotential of 242 mV at 10 mA cm−2. This work provides an efficient way to construct amorphous quantum dots by strong metal-support interaction. [ABSTRACT FROM AUTHOR]