Kim, Kookhan Park, Jungjin Kim, Shin-Yeong Heo, Sungeun Ku, Kwangmo Yu, Seung-Ho Kim, Chunjoong Sung, Yung-Eun 2025-08-31T03:00:25Z 2025-08-31T03:00:25Z 2025-08-27 2025-08 1998-0124 https://pubs.kist.re.kr/handle/201004/153076 Cobalt sulfide catalysts (CoS and CoS2) with different phases, electrical conductivities, porosities, and specific surface areas are synthesized and loaded on a carbon paper (CP) interlayer which has a role to support an electrically conductive network for maximizing the catalytic activity of cobalt sulfide. Based on the detailed diagnosis about electrochemical results, cobalt sulfides reveal their electrocatalytic activity to promote both polysulfide reduction and Li2S nucleation during discharge. We propose a new interpretation about the capacity vs. voltage profiles of Li-S cells, which can elaborate on the reduction reaction of sulfur during the discharge reaction. Through the electrochemical examination, we determine the role of cobalt sulfide catalysts as well as CP interlayer and the critical factors of cobalt sulfides for the enhanced performances of Li-S batteries. Our work provides new insights for understanding about the catalytic activity of cobalt sulfides and designing advanced catalysts for the high utilization of sulfur in Li-S batteries. English Tsinghua Univ Press Understanding the role of cobalt sulfide catalysts for high sulfur utilization in Li-S batteries Article 10.26599/NR.2025.94907635 1 Nano Research, v.18, no.8 Nano Research 18 8 Y scie scopus 001551926100009 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article SITU RAMAN-SPECTROSCOPY REACTION-MECHANISM LITHIUM PERFORMANCE CONVERSION cobalt sulfide catalysts interlayer Li-S batteries electrocatalyst electrically conductive network rate capability