| 000 | 00000nam c2200205 c 4500 | |
| 001 | 000046132277 | |
| 005 | 20221031095018 | |
| 007 | ta | |
| 008 | 220622s2022 ulkad bmAC 000c eng | |
| 040 | ▼a 211009 ▼c 211009 ▼d 211009 | |
| 041 | 0 | ▼a eng ▼b kor |
| 085 | 0 | ▼a 0510 ▼2 KDCP |
| 090 | ▼a 0510 ▼b 6D5 ▼c 1229 | |
| 100 | 1 | ▼a 구진숙, ▼g 具辰淑 |
| 245 | 1 0 | ▼a Intrinsically microporous ion-pair coordinated membranes for HT-PEMFCs / ▼d Jinsuk Ku |
| 260 | ▼a Seoul : ▼b Graduate School, Korea University, ▼c 2022 | |
| 300 | ▼a x, 65장 : ▼b 삽화(일부천연색), 도표 ; ▼c 26 cm | |
| 500 | ▼a 지도교수: 이정현 | |
| 502 | 0 | ▼a 학위논문(석사)-- ▼b 고려대학교 대학원: ▼c 화공생명공학과, ▼d 2022. 8 |
| 504 | ▼a 참고문헌: 장 61-65 | |
| 530 | ▼a PDF 파일로도 이용가능; ▼c Requires PDF file reader(application/pdf) | |
| 653 | ▼a Microporous polymer ▼a Ion conducting membrane ▼a High temperature polymer electrolyte membrane fuel cell ▼a Polymer electrolyte membrane | |
| 776 | 0 | ▼t Intrinsically Microporous Ion-Pair Coordinated Membranes for HT-PEMFCs ▼w (DCOLL211009)000000268948 |
| 900 | 1 0 | ▼a Ku, Jinsuk, ▼e 저 |
| 900 | 1 0 | ▼a 이정현, ▼g 李政炫, ▼e 지도교수 |
| 900 | 1 0 | ▼a Lee, Jung-Hyun, ▼e 지도교수 |
| 945 | ▼a ITMT |
Electronic Information
| No. | Title | Service |
|---|---|---|
| 1 | Intrinsically microporous ion-pair coordinated membranes for HT-PEMFCs (4회 열람) |
View PDF Abstract Table of Contents |
Holdings Information
| No. | Location | Call Number | Accession No. | Availability | Due Date | Make a Reservation | Service |
|---|---|---|---|---|---|---|---|
| No. 1 | Location Science & Engineering Library/Stacks(Thesis)/ | Call Number 0510 6D5 1229 | Accession No. 123069518 | Availability Available | Due Date | Make a Reservation | Service |
| No. 2 | Location Science & Engineering Library/Stacks(Thesis)/ | Call Number 0510 6D5 1229 | Accession No. 123069519 | Availability Available | Due Date | Make a Reservation | Service |
Contents information
Abstract
Fuel cells are electrochemical devices with high energy efficiency expected to be applied economically and eco-friendly across various energy sectors. Low-temperature polymer electrolyte membrane fuel cells (LT-PEMFCs) using Nafion operates at a relatively low operating temperature (60-80 ℃) and a full hydration condition. HT-PEMFC is operable at high temperatures (140-180 ℃), but requires anhydrous conditions to avoid loss of doped phosphoric acid (PA). In this study, intrinsically microporous ion-pair coordinated membranes were synthesized to compensate for the shortcomings of LT-PEMFC and HT-PEMFC. It was synthesized using superacid-catalyzed step-growth polycondensation, and two diphenol monomers (4,4'-dihydroxybiphenyl or 4,4′-(hexafluoroisopropylidene) diphenol) and a ketone monomer (4′-Bromo-2,2,2-trifluoroacetophenone) and an acid catalyst (trifluoromethanesulfonic acid, TFSA) can be used to synthesize a polymer with a microporous structure. It was designed to have microporous free volume in the polymer chain due to the contorted molecular polymer structure. A tertiary amine group (piperidine or pyrrolidine) was introduced through the Buchwald-Hartwick amination reaction to enable acid-base bonding between the PA and PEMs. Subsequently, membranes were designed to form strong ionic bonds with PA by introducing a quaternary amine cationic group through methylation of tertiary amine-functionalized PIMs. The PEMs will confine PA within the micropores and reduce PA loss by binding quaternary amine cations and ion pairs even in the presence of water condensation, enabling stable operation in a wider temperature and humidity conditions.
Table of Contents
1. Introduction 1 1.1. High temperature polymer electrolyte membrane fuel cells (PEMFCs) 4 1.2. Challenges in HT-PEMFCs technology 9 1.3. Ion-pair coordinated membranes 10 1.4. PA-doped intrinsically microporous membranes 12 1.5. Proposal of intrinsically microporous ion-pair coordinated membranes for HT-PEMFCs 13 2. Experimental 14 2.1. Materials 14 2.2. Characterization 14 2.3. Synthesis of PIM backbones, PXBP-TFABr and PXHFP-TFABr 15 2.4. Representative synthesis of aminated PIMs, PXBP-C5N, PXBP-C4N, PXHFP- C5N and PXHFP- C4N (Amination) 17 2.5. Representative synthesis of ionic PIMs, PXBP-C5N+ I -, PXBP-C4N+ I , PXHFP-C5N+ I and PXHFP-C4N+ I (Methylation) 20 2.6. Fabrication of membrane 23 2.7. PA doping 23 2.8. Proton conductivity 24 2.9. Relative humidity (RH) cycling experiments 25 3. Results and Discussion 27 3.1. Polymer preparation and characterization 27 3.1.1. Synthesis of PIM backbones, PXBP-TFABr and PXHFP-TFABr 27 3.1.2. Representative synthesis of aminated PIMs, PXBP-C5N, PXBP-C4N, PXHFP- C5N and PXHFP- C4N (Amination) 32 3.1.3. Representative synthesis of ionic PIMs, PXBP-C5N+ I -, PXBP-C4N+ I , PXHFP-C5N+ I and PXHFP-C4N+ I (Methylation) 35 3.2. Thermal stability and mechanical properties 41 3.3 Characterization of Intrinsic Microporosity 48 3.4. PA doping level 50 3.5. Proton conductivity and PA retention 56 4. Conclusion 60 5. References 61
