https://scholar.dgist.ac.kr/handle/20.500.11750/12079 2026-04-04T13:10:07Z https://scholar.dgist.ac.kr/handle/20.500.11750/58735 Title: 에틸렌에 대한 생산성이 향상된 이산화탄소 전기화학적 전환 촉매 및 이를 포함하는 이산화탄소 전환용 흐름전지 Author(s): 남대현; 김종윤; 이윤구; 이태민 Abstract: 본 발명은 구리 나노 와이어를 포함하는 코어부; 및 상기 코어부를 감싸며, 그래핀 양자점 및 환원제를 포함하는 시스부;를 포함하고, 상기 환원제는 상기 그래핀 양자점과 결합을 통해 구리 나노 와이어에 고정된 것인, 이산화탄소 전기화학적 전환 촉매 및 상기 촉매를 포함하는 이산화탄소 전환용 흐름전지에 관한 것으로, 높은 생산성으로 이산화탄소로부터 에틸렌을 제조할 수 있으며, 촉매의 내구성 및 수명을 향상시키는 효과를 제공할 수 있다. https://scholar.dgist.ac.kr/handle/20.500.11750/58600 Title: Advancements in Understanding Catalyst Reconstruction During Electrochemical CO2 Reduction Author(s): Kwon, Woosuck; Kim, Dohun; Lee, Yujin; Jung, Jinoh; Nam, Dae-Hyun Abstract: Electrochemical CO2 reduction reaction (CO2RR) has received great attention to solve CO2- induced global warming and carbon neutrality. It is essential to enhance the electrochemical CO2RR selectivity, activity, and long-term stability for sustainable manufacturing of specific chemicals via CO2RR. To produce multi-carbon (C2+) chemicals, Cu-based heterogeneous catalysts have been developed in terms of defect engineering, morphological design, and facet control. Despite the substantial efforts for the design of efficient Cu-based heterogeneous catalysts, there exist inevitable structural changes of catalysts with continuous dissolution and redeposition during CO2RR. This reconstruction modifies the as-synthesized catalysts into an unpredictable structure and leads to changes in active site. Here, we review the reconstruction of Cu-based catalysts during CO2RR, which occurs via continuous dissolution and redeposition process. This includes fundamental principles of reconstruction and the effect of microenvironment on reconstruction during CO2RR. We offer research progress about the reconstruction of Cu-based electrocatalysts, analysis methodologies to track the reconstruction, and the insight to improve the activity, selectivity, and stability of CO2RR. We provide perspective to understand and harness the reconstruction for the development of efficient CO2RR catalysts. 2025-07-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/57753 Title: Molecularly-Enhanced Heterogeneous Catalysts for CO₂ Electroconversion Author(s): 남대현 Abstract: Electrochemical CO2 reduction reaction (CO2RR) which can convert CO2 to fuels and feedstocks addresses the needs for carbon neutrality. Production of hydrocarbons and oxygenates is in sight; yet it remains a challenge for selective and efficient electrosynthesis. Introducing molecular approaches to CO2RR electrocatalysts can enhance product selectivity and catalytic activity by leveraging the interplay between heterogeneous and homogeneous catalysts. Here, I will present our recent efforts to develop molecularly-enhanced CO2RR electrocatalysts. First, we studied ionomers which control the microenvironment of gas diffusion electrode. We unveil how side chains and ionic groups in ionomers affect CO2/H2O ratio and CO2RR of Cu electrocatalysts. Second, we introduce how we harness metal-organic frameworks (MOFs) for CO2RR. This work provides the guidelines to understand the reconstruction of MOFs. Perspective will be discussed in conclusion. 2024-09-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/57430 Title: Thermodynamic phase control of Cu-Sn alloy electrocatalysts for selective CO2 reduction Author(s): Go, Soohyun; Kwon, Woosuck; Hong, Deokgi; Lee, Taemin; Oh, Sang-Ho; Bae, Daewon; Kim, Jeong-Heon; Lim, Seolha; Joo, Young-Chang; Nam, Dae-Hyun Abstract: In the electrochemical CO2 reduction reaction (CO2RR), Cu alloy electrocatalysts can control the CO2RR selectivity by modulating the intermediate binding energy. Here, we report the thermodynamic-based Cu-Sn bimetallic phase control in heterogeneous catalysts for selective CO2 conversion. Starting from the thermodynamic understanding about Cu-Sn bimetallic compounds, we established the specific processing window for Cu-Sn bimetallic phase control. To modulate the Cu-Sn bimetallic phases, we controlled the oxygen partial pressure (pO2) during the calcination of electrospun Cu and Sn ions-incorporated nanofibers (NFs). This resulted in the formation of CuO-SnO2 NFs (full oxidation), Cu-SnO2 NFs (selective reduction), Cu3Sn/CNFs, Cu41Sn11/CNFs, and Cu6Sn5/CNFs (full reduction). In the CO2RR, CuO-SnO2 NFs exhibited formate (HCOO−) production and Cu-SnO2 NFs showed carbon monoxide (CO) production with the faradaic efficiency (FE) of 65.3% at −0.99 V (vs. RHE) and 59.1% at −0.89 V (vs. RHE) respectively. Cu-rich Cu41Sn11/CNFs and Cu3Sn/CNFs enhanced the methane (CH4) production with the FE of 39.1% at −1.36 V (vs. RHE) and 34.7% at −1.50 V (vs. RHE). However, Sn-rich Cu6Sn5/CNFs produced HCOO− with the FE of 58.6% at −2.31 V (vs. RHE). This study suggests the methodology for bimetallic catalyst design and steering the CO2RR pathway by controlling the active sites of Cu-Sn alloys. © 2024 The Royal Society of Chemistry. 2024-10-31T15:00:00Z