http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
그래핀에 담지된 Fe<sub>3</sub>O<sub>4</sub>와 CuO 나노입자의 리튬이차전지 음극성능
정재훈,정동원,한상욱,김광현,오은석,Jeong, Jae-Hun,Jung, Dong-Won,Han, Sang-Wook,Kim, Kwang-Hyun,Oh, Eun-Suok 한국전기화학회 2011 한국전기화학회지 Vol.14 No.4
본 연구에서는 에틸렌글리콜을 사용한 polyol reduction 방법으로 나노크기의 $Fe_3O_4$와 CuO가 각각 그래핀에 분산된 $Fe_3O_4$/graphene, CuO/graphene 복합체를 합성하였으며, 이를 리튬이차전지의 음극활물질로 사용한 전극의 성능을 평가하였다. 합성된 복합체의 물리적 특성은 SEM, XRD, TGA 등으로 분석하였으며, 반쪽전지를 제조하여 충/방전, cyclic voltammetry, 교류 임피던스 등의 전기화학적 특성평가를 수행하였다. 그래핀 표면에 분산된 금속산화물 나노입자들에 의한 용량증가 및 전기적 네트워크 향상 등의 효과로 $Fe_3O_4$/graphene 및 CuO/graphene 복합체의 전극성능이 그래핀 전극보다 우수하였다. 복합체의 경우 30회 충/방전 후에도 600 mAh/g 용량을 유지하였다. In this study, $Fe_3O_4$/graphene and CuO/graphene composites were synthesized by the polyol reduction method using ethylene glycol, and their performances as the anodes of lithium ion batteries were evaluated. The physical characteristics of the synthesized composites were analyzed by SEM, XRD, and TGA. In addition, their electrochemical properties were examined by the electrochemical analysis techniques such as charge/discharge performance, cyclic voltammetry, and AC impedance spectroscopy. The cells composed of $Fe_3O_4$/graphene and CuO/graphene composites showed better performance than the graphene electrode, due to the dispersion of nanosized $Fe_3O_4$ or CuO on the surface of graphene and the formation of good electrical network in the electrode. Their composites kept the reversible capacity more than 600 mAh/g even after the charging/discharging of 30 cycles.
수소부족에 의한 PEMFC의 역전위에서 탄소나노튜브 담지 Pt 촉매의 전기화학적 내구성
정동원(Dong-won Jung),김세훈(Se-hoon Kim),정주해(Ju-hae Jung),김준범(Jun-bom Kim),오은석(Eun-suok Oh) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In this research, we investigated the influence of the reverse potential accelerated by hydrogen starvation on the performance and durability of the polymer electrolyte membrane fuel cell (PEMFC), and the effects of carbon nanotubes (CNTs) as a catalyst support on the suppress of degradation of the catalyst layer under the reverse potential. During the operation of the PEMFC, the reverse potential by the fuel starvation took place and created carbon corrosion in the catalyst layer of both electrodes as well as the catalyst layer degradation such as the agglomerization of Pt particles. However, the agglomeration of the Pt particles was able to be suppressed by applying CNTs as the support of the Pt particles.