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The Sulfidation and Oxidation Behavior of Sputter-Deposited Nb-Al-Cr Alloys at High Temperatures
Habazaki, Hiroki,Yokoyama, Kazuki,Konno, Hidetaka 한국부식방식학회 2003 Corrosion Science and Technology Vol.2 No.3
Sputter-deposited Nb-Al-Cr alloys, 3-5 ㎛ thick, have been prepared on quartz substrates as oxidation and sulfidation-resistant materials at high temperatures. The oxidation of the alloys in the Ar-O₂ atmosphere of an oxygen partial pressure of 20 kPa follows approximately the parabolic rate law, thus being diffusion controlled. Their oxidation rates are almost the same as or even lower than those of the typical chromia-forming alloys. The multi-layered oxide scales are formed on the ternary alloys. The outermost layer is composed of Cr₂O₃, which is mainly responsible for the high oxidation resistance of these alloys. In contrast to sputter-deposited Cr-Nb binary alloys reported previously, the inner layer is not porous. TEM observation as well as EDX analysis indicates that the innermost layer is a mixture of Al₂O₃ and niobium oxide. The dispersion of Al₂O₃ in niobium oxide may be attributable to the prevention of the formation of the porous oxide layer. The sulfidation rates of the present ternary alloys are higher than those of the sputter-deposited Nb-Al binary alloys, hut still several orders of magnitude lower than those of conventional high temperature alloys. Two-layered sulfide scales are formed, consisting of an outer Al₂S₃ layer containing chromium and an inner layer composed of NbS₂and a small amount of Cr₂S₃. The presence of Cr₂S₃ in the inner protectivc NbS₂ layer may be attributed to the increase in the sulfidation rates.
Kim, Cheong,Habazaki, Hiroki,Park, Soo Gil The Korean Electrochemical Society 2016 Journal of electrochemical science and technology Vol.7 No.3
In this study, we studied the enhancement of the energy densities of electrochemical capacitors by improving the working voltage range of the electrolyte. To prevent the decomposition of the electrolyte, stable SEI layers were formed by reductive degradation of additive materials such as fluoro-ethylene carbonate (FEC) and vinyl ethylene carbonate (VEC) before degradation of the base electrolyte. As a result, the solution resistance (R<sub>s</sub>) of EC:DMC + SL 20 % + VEC 1 % electrolytes observed 1.47 Ω and the charge transfer resistance (R<sub>ct)</sub> was 2.64 Ω at the open circuit voltage. Additionally, a cycle retention of 94 % was observed for EC:DMC + SL 20 % + VEC 1 % after 500 cycles at 3.5 V.
CNT 첨가를 통해 표면 처리한 LTO의 특성향상에 관한 연구
박수길(Soo-Gil Park),김청(Cheong Kim),Hiroki Habazaki 한국표면공학회 2016 한국표면공학회지 Vol.49 No.2
Among the lithium metal oxides for hybrid-capacity, Li₄Ti5O12(LTO) is an emerging electrode material as zero-stain material in volume change during the with the charging and discharging processes. However, LTO has a limitation of low ionic and electronic conductivity. To enhance the ionic and electronic properties of Li₄Ti5O1₂(LTO), we synthesized the spherical LTO/CNT composite by sol-gel process for hybrid capacitors. CNT interconnection networks between CNT-LTO particles enhanced electronic conductivity and electrochemical charging/discharging properties. All of the LTO samples was observed to show the spinel structure and spherical morphology with the diameter of 5 ~ 10 μm. Especially, spherical LTO/CNT composite of the CNT-3 wt% showed the enhanced capacity from 110 mAh/g to 140 mAh/g at 10 C.