Title

Electrolytic Cation Effect on Salt Formation and Methanol Production Using a Membrane Electrode Assembly in Acidic CO₂ Reduction

Alternative Title

산성 전해질 하에 막전극 접합체를 사용하여 알칼리 양이온의 종류에 따른 메탄올과 염 형성 효과에 관한 연구

DGIST Authors

Yeon-A Cha ; Jongmin Choi ; Dae-Hyen Nam

Advisor

최종민

Co-Advisor(s)

Dae-Hyen Nam

Issued Date

2026

Awarded Date

2026-02-01

Type

Thesis

Description

CO₂ Reduction Reaction, Methanol, Membrane Electrode Assembly, Salt Formation

Table Of Contents

Ⅰ. Introduction 1
1.1 Electrochemical CO₂ Reduction Reaction 1
1.1.1 Electrochemical CO₂Reduction to Methanol 1
1.1.2 Heterogeneous Catalyst 5
1.2 Acidic CO₂ Reduction using Membrane Electrode Assembly 8
1.2.1 Membrane Electrode Assembly 8
1.2.2 Issue of Salt Formation during CO₂ Reduction Operating 10
1.3 Cation Effect on CO₂ Reduction Reaction 14
1.4 Research Motivation and Strategy 16

Ⅱ. Theoretical Background 19
2.1 Electrochemical Reaction Mechanism of CO₂ Reduction 19
2.2 Evaluation of CO₂ Reduction Performance 19
2.3 Ion Transport Mechanism Across Different Membranes 22
2.3.1 Ion Exchange Membranes 23
2.3.2 Porous Separator 27
2.3.3 Ion Selective Nanostructured Membrane 32

Ⅲ. Experimental 34
3.1 Synthesis of Cobalt Phthalocyanine/Multiwalled Carbon nanotube Catalyst 34
3.2 Material Characterization 34
3.3 Electrode Preparation 35
3.4 Quantification Methods for Ion Crossover 35
3.5 Evaluation of CO₂ Reduction Performance 36
3.6 Salt Extraction Analysis and Solubility Measuring Methods 37

Ⅳ. Results and Discussion
4.1 Characterization of CoPc/MWCNT 39
4.2 Effect of Cation Type on Product Profile 41
4.3 Relationship between Salt Formation and Methanol 46
4.3.1 Ion Crossover Behavior according to Cation Type 50
4.3.2 Salt Formation Tendency 55
4.3.3 Difference of Solubility depending on Cation Species 61
4.4 Variation of Product with increasing current density 67

V. Conclusion 71

VI. Reference 73

요약문 79

URI

https://scholar.dgist.ac.kr/handle/20.500.11750/59694
http://dgist.dcollection.net/common/orgView/200000950705

DOI

10.22677/THESIS.200000950705

Degree

Master

Department

Department of Energy Science and Engineering

Publisher

DGIST

Show Full Item Record