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RISS 인기검색어
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- 저자 : XINHAI HE (검색결과 2 건)
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XIAOLEI SU,YONGSHENG TAN,YAN JIA,KAILI ZHAO,SONGTAO LIU,XINHAI HE,CHONG FU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.2
Cu-doped SiC nanopowders have been prepared via combustion synthesis of the silicon andcarbon system in a 0.1 MPa nitrogen atmosphere under di®erent reaction time, using copper asthe dopant and PTFE as the chemical activator, respectively. X-ray di®raction, scanning elec-tronic microscope and Raman spectra have been used to characterize the phase and morphologyof prepared nanopowders. Results indicate that the lattice constant of prepared Cu-doped SiCnanopowder decreases with extending reaction time. The prepared nanopowders have ¯nespherical particles and narrow particle size distribution and the particle size increases withincreasing reaction time. The electric permittivities of prepared Cu-doped SiC nanopowders inthe frequency range of 8.2 – 12.4 GHz have been determined. The real part " 0, imaginary part " 00and dielectric loss tg ? of complex permittivity decrease with increasing reaction time. All pre-pared Cu-doped SiC nanopowder exhibits good microwave absorption property in the frequencyrange of 8.2 – 12.4 GHz.
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Najeeb ur Rehman Lashari,Mingshu Zhao,Jun Wang,XINHAI HE,Irfan Ahmed,Miao Miao Liang,Songpon Tangsee,Xiaoping Song 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
The energy storage properties of layered metal vanadate, especially alkali metal vanadates have beenextensively studied. Metal vanadates have a more robust electrochemical output in contrast with pristinevanadium oxides. However, the detailed processes underlying the efficiency contrast of vanadates andvanadium oxides have rarely been studied. Herein a facile hydrothermal and low-temperature polymerizationmethod was introduced to synthesize KV3O8 and KV3O8@PPy nanowire bundles as anode materialfor an aqueous rechargeable Lithium batteries. The nanowires are composed of KV3O8·0.59H2O calculatedusing thermal gravimetric analysis (TGA). Successfully synthesized layered vanadium based KV3O80.59H2O (KVO) and KV3O8 0.59H2O@PPy (KVO@PPy) nanowires and investigated the source of theimproved electrochemical efficiency of PPy coated potassium vanadates compared to pristine KVO usingcrystal structure analysis and electrochemical tests. We demonstrated increase in electrochemical stabilityfor KVO@PPy caused by synergistic effect of K+ in vanadate nanowires and PPy coating. In KVO theoxygen atoms have close contact with the K ions, and the stable K+ serve as ‘‘pillars” between interlayersto shield the layered structures from collapse during the charge/discharge phase, while the PPy reducescharge transfer resistance. This research adds helps us design better electrode materials to be used as ananode material for ARLB using alkali metal vanadate.
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