표제지
목차
Part Ⅰ. 공기극의 불순물 농도에 따른 PEMFC의 성능 영향성 8
초록 8
1. 서론 9
2. 실험 11
2.1. 단위 전지 실험과 작동조건 12
2.2. 전기화학적 분석 13
3. 결과 13
4. 결론 19
참고문헌 20
ABSTRACT 30
Part Ⅱ. 탄소전극의 표면개질에 따른 VRFB의 전기화학특성 연구 31
초록 31
1. 서론 32
2. 실험 35
2.1. 탄소 전극의 활성 과정 35
2.2. 전기화학적 분석 35
2.3. 단위전지실험 35
3. 결과 37
4. 결론 47
참고문헌 48
ABSTRACT 52
Part Ⅰ 19
Table. 1. The value of charge transfer resistance from EIS test 19
Part Ⅱ 37
Table. 2. The weight loss of carbon felts after heat treatment 37
Table. 3. The XPS C1s spectra fitting results from Fig. 12 40
Table. 4. The XPS O1s spectra fitting results from Fig. 13 42
Table. 5. Electrochemical properties from CV results of Fig. 13 43
Table. 6. The efficiencies and IR drops from unit cell tests 46
Part Ⅰ 11
Fig. 1. A schematic diagram of PEMFC in the study 11
Fig. 2. The shape of the channel, the MEA and the gasket in the study 12
Fig. 3. Polarization curve and power density with case1(a), case2(b), and case3(c) 13
Fig. 4. Effect of mixture gas (case 1(a), case 2(b) and case 3(c)) in the cell potential at 0.8 A cm¯² 14
Fig. 5. The CV curve after poisoning with case1(a), case2(b), and case3(c) 15
Fig. 6. The CV curve before and recovery with case1(a), case2(b), and case3(c) 16
Fig. 7. ECSA comparison according to each case 17
Fig. 8. Results of the EIS at 0.2 A cm¯² with case 1(a), case 2(b) and case 3(c) 18
Part Ⅱ 34
Fig. 9. The activation process in this study 34
Fig. 10. The electrode guide 36
Fig. 11. The SEM image of pristine(a), 700℃(b), 750℃(c), 800℃(d), 850℃(e), and 900℃(f) 37
Fig. 12. The XPS result of carbon felt after heat treatment 38
Fig. 13. C1s spectra at pristine(a), 700℃(b), 750℃(c), 800℃(d), 850℃(e), 900℃(f) 40
Fig. 14. O1s spectra at pristine(a), 700℃(b), 750℃(c), 800℃(d), 850℃(e), 900℃(f) 41
Fig. 15. CV comparisons for various heat treatment temperatures 43
Fig. 16. EIS comparison for various heat treatment temperatures 45
Fig. 17. Efficiencies comparison (a) and charge/discharge curve (b) at 60 mA cm¯² 46