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      저자 : Yingchang Yang (검색결과 2 건)
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      • KCI등재

        Understanding the friction behavior of sulfur-terminated diamond-like carbon films under high vacuum by first-principles calculations

        Renhui Zhang,Juan Zhao,Yingchang Yang,Wei Shi,Zhibin Lu,Junjun Wang 한국물리학회 2018 Current Applied Physics Vol.18 No.3

        Generally, the repulsive force was a key factor account for superlow friction of H or F doped diamond-like carbon (DLC) films under high vacuum. As we known, H or F doped DLC usually exhibited superlow friction under high vacuum. However, the superlow friction of S doped DLC under high vacuum was not found so far. This phenomenon was desirable to be well investigated. In this work, S-terminated diamond interfaces also exhibited strong repulsive force, however, the estimated friction coefficient was variable for S-terminated diamond interfaces. The lowest and largest friction coefficient was about 0.003 and 0.4 respectively, which indicated that the superlow friction of S doped DLC could achieve in theory. In order to well probe the unusual friction behavior of S doped DLC under high vacuum, using first-principles method, the repulsive interaction between sliding surfaces was well investigated in order to understand the unusual friction behavior of S doped DLC films.

      • KCI등재

        First-principles investigation of the monoclinic NaMnO2 cathode material for rechargeable Na-ion batteries

        Renhui Zhang,Zhibin Lu,Yingchang Yang,Wei Shi 한국물리학회 2018 Current Applied Physics Vol.18 No.11

        Using first-principles calculations, we successfully investigate the electrochemical performance of the monoclinic NaMnO2 for the sodium ion batteries. NaMnO2 possesses a voltage window of 3.54–2.52 V and theoretical reversible capacity of 136 mAh g−1. Besides, we find that the metallicity of the monoclinic NaMnO2 gradually increases during Na extraction. Moreover, the computational Na migration energy barrier in the monoclinic NaMnO2 is 0.18 eV, ensuring ideal conductivity and reversible capacity. Although the Jahn-Teller distortion effects limit the enhancement of the reversible capacity of the monoclinic NaMnO2, it is still a right cathode material for the sodium ion batteries. The computational results are well in consistent with the experimental investigations.

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