DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 강정구 | - |
dc.contributor.author | Kim, Soyun | - |
dc.contributor.author | 김소윤 | - |
dc.date.accessioned | 2024-07-25T19:31:09Z | - |
dc.date.available | 2024-07-25T19:31:09Z | - |
dc.date.issued | 2023 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=1045877&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/320649 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 신소재공학과, 2023.8,[iv, 47 p. :] | - |
dc.description.abstract | This paper discusses the dendrite-free Zn anode for long-term cycle stability of Alkaline Zn batteries. A unique Zn-Cu alloy NP@NC is synthesized through solution synthesis and heat treatment. The Cu precursor was inserted in ZIF-8 by simple drop-casting. Heat treatment allowed for ZIF-8 and Zn, Cu species to transform into N-doped carbon (NC) and Zn-Cu solid solution respectively, enhancing overall electrochemical performance. The as-prepared Zn-Cu alloy NP@NC is characterized by Powder X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Brunauer-Emmett-Teller (BET), and X-ray Photoelectron Spectroscopy (XPS). Then the symmetric cell was assembled to verify plating/stripping behavior. Electrode evaluation was performed by cycle test in high-pH environment. The Zn-Cu alloy NP@NC exhibited remarkable electrochemical performance compared with that of the bare Zn foil. It stably operated over 500 h, while short circuit occurred only after 25 h for bare Zn foil. In order to demonstrate the excellent cycle stability of Zn-Cu alloy NP@NC, characterization of electrode was conducted after cycle test. Furthermore, DFT calculation supports the fundamental principle of excellent cycle performance for Zn-Cu alloy NP@NC. The outstanding electrochemical behavior is ascribed to mainly two points. First one is that well-distributed sub-nano size Zn-Cu alloy nanoparticles (NPs) derived low-energy barrier Zn nucleation sites. Second one is the abundant micro-, mesoporous N-doped carbon structure acted as an ion-sieving mesh and enabled redox ions to diffuse easily. As a result, our electrode, Zn-Cu alloy NP@NC lead to stable and smooth Zn plating in high-pH electrolyte. This paper shows the promising methodology for designing anode material to realize long-term cycle stability of rechargeable Alkaline Zn batteries. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | 아연 침상▼a아연 산화물 부동태화▼a수소 발생 반응▼a아연친화성▼a2원계 합금▼a불균일 핵 생성▼a선택적 이온 투과성▼a나노 입자▼a질소 도핑된 탄소▼a메조 기공 | - |
dc.subject | Zn dendrite▼aZnO passivation▼aHydrogen Evolution Reaction▼azincophilic▼abimetallic alloy▼aheterogeneous nucleation▼aion-sieving▼ananoparticle▼aN-doped carbon▼amesopore | - |
dc.title | Dendrite-free Zn anode induced by Zn-Cu alloy NP@NC yolk-shell nanostructure for ultralong cycle stability alkaline Zn batteries | - |
dc.title.alternative | 높은 사이클 거동의 알칼리 아연 전지를 위한 아연 구리 합금과 탄소 복합 나노구조체의 아연 침상 성장 억제 거동에 관한 연구 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :신소재공학과, | - |
dc.contributor.alternativeauthor | Kang, Jeung Ku | - |
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