DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Lee, Jae Woo | - |
dc.contributor.advisor | 이재우 | - |
dc.contributor.author | Kim, Yeeun | - |
dc.contributor.author | 김예은 | - |
dc.date.accessioned | 2017-03-29T02:34:22Z | - |
dc.date.available | 2017-03-29T02:34:22Z | - |
dc.date.issued | 2016 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=649493&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/221514 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2016.2 ,[v, 38 p. :] | - |
dc.description.abstract | This work introduces the derivation of boron-manganese-carbon nanocomposites by $CO_2$ carbonization using sodium borohydride ($NaBH_4$) as a reduction agent at 1 bar, followed by impregnating a manganese oxide (MO) form into boron-doped porous carbon (BPC). The prepared composites (BPCMO) can be used as an advanced electrochemical energy material such as an active electrocatalyst for oxygen reduction reaction (ORR) and an electrode material for supercapacitors. Various spectroscopic and microscopic measurements were carried out to investigate the morphology and structure of the BPCMO. Among many types of manganese oxide, it was confirmed that only $Mn_3O_4$ is embedded into the BPC. Cyclic and linear sweep voltammetry indicated that the BPCMO exhibits a four electron transfer pathway and comparable oxygen reduction reaction (ORR) activity to commercial Pt/C. Galvanostatic charge/discharge and electrochemical impedance spectroscopic measurements showed that the BPCMO provided a remarkable capacitance ($150 F g^{-1}$ at $1.0 A g^{-1}$ and $136 F g^{-1}$ at $10.0 A g^{-1}$) compared to the BPC ($58 F g^{-1}$ at $1.0 A g^{-1}$ and $15 F g^{-1}$ at $10.0 A g^{-1}$) with a highly stable capacitance retention of 93.9 % over 3500 charge/discharge cycles. It was found that the electrochemical performance is enhanced due to the generation of new active sites, the increase in specific surface areas, and the reduced overall resistance through the impregnation of $Mn_3O_4$. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Fuel cells | - |
dc.subject | Oxygen reduction reaction | - |
dc.subject | Supercapacitors | - |
dc.subject | Carbon dioxide ($CO_2$) | - |
dc.subject | Manganese oxide ($Mn_3O_4$) | - |
dc.subject | Boron-doped porous carbon | - |
dc.subject | 연료전지 | - |
dc.subject | 산화환원반응 | - |
dc.subject | 슈퍼커패시터 | - |
dc.subject | 이산화탄소 | - |
dc.subject | 산화망간($Mn_3O_4$) | - |
dc.subject | 붕소가 도핑된 다공성 탄소 | - |
dc.title | Manganese oxide-boron composite porous carbons synthesized from carbon dioxide for electrochemical energy applications | - |
dc.title.alternative | 이산화탄소로부터 합성된 산화망간-보론 복합 다공성 탄소의 전기화학적 에너지 물질로서의 응용 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :생명화학공학과, | - |
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