| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Atomically Loaded Iridium Catalysts on Nitrogen-doped Carbon Nanotubes for Highly Active Electrochemical Lithium-Carbon Dioxide Reactions |
| 초록 | Carbon dioxide (CO2), known as a greenhouse gas, must be reduced to relieve sudden increase in atmosphere temperature resulting in climate change. Recently, Li-CO2 batteries have been reported due to their bifunctional benefits enabling spontaneous energy utilization and environmental CO2 fixation instead of use of external electricity. Nevertheless, the Li-CO2 batteries often suffer from large overpotential problem induced from insulating carbonate products, thereby degrading cell performance. Therefore, it is needed to simultaneously solve the low catalytic activity issue of the non-noble metal catalyst and the high cost and low deposits issues of the noble metal catalyst. As a solution, single atom catalysts (SACs) are well known for high stability and cost-efficiency because of its extremely small size (‹ 0.2 nm). Depending on the metal and support material used, SACs can have high activity in diverse electrochemical reactions including carbon dioxide reduction (CO2RR) and oxidation (CO2ER). In this work, we successfully synthesized atomically loaded iridium catalyst on nitrogen-doped carbon nanotubes (Ir-N-CNT) by filtration of CNT dispersed precusor soluion and subseqent thermal treatment. We minutely controlled the size of Ir particles from single atom (‹ 0.2 nm) to nanoparticle (› 3 nm) catalysts by adjusting amount of Ir precursor. Optimal synthetic condition is explored by electrochemical test of the Ir-N-CNT catalysts under Li-CO2 cells. We achieved better catalytic activity and stable cycle performance of the Ir-N-CNT materials in the Li-CO2 cells for discharge and charge reactions. This study regarding tailored catalyst materials based on SACs offers a hint to enable realization of Li-CO2 batteries for carbon neutrality. |
| 저자 | Yeo-Jin Rho1, Bo-Ran Kim2, Won-Hee Ryu1 |
| 소속 | 1Department of Chemical and Biological Engineering, 2Sookmyung Women's Univ. |
| 키워드 | Single atom catalysts; Lithium-carbon dioxide battry; Carbon dioxide reduction reaction; Nitrogen doped carbon nanotube |
