Juhyung Choi Aihua Jin Hyun Dong Jung Dongjin Ko Ji Hyun Um Yoon Jeong Choi So Hee Kim Seoin Back Seung-Ho Yu Yuanzhe Piao 2024-01-12T03:30:43Z 2024-01-12T03:30:43Z 2022-03-31 2022-06 2405-8297 https://pubs.kist.re.kr/handle/201004/76719 Graphitic carbon materials, particularly few-layered graphene, exhibit great potentials as potassium-ion battery (PIBs) anodes. However, bulk graphene-based ma-terials have the disordered structure owing to randomly stacked graphene layers, which causes the high migration barrier during K+ intercalation/deintercalation reactions and thus the surface-dominated capacitive response. Here, we present a novel nanoarchitecture of nitrogen and sulfur co-doped graphene nanoribbons with well-ordered stepped edges (NS-sGNR) via the electrochemical unzipping of multiwalled carbon nanotubes (MWCNTs) and the subsequent N/S co-doping process for high-performance PIB anodes. As an anode material for PIBs, the prepared sample exhibits high initial capacity (329.1 mAh g(-1) at 50 mA g(-1)), superior rate capability (211.7 mAh g(-1) at high current density, 2000 mA g(-1)), outstanding reversibility of K-staging, and stable long-term cyclability. Theoretical calculations were conducted to demonstrate that sGNRs with NS co-doping (NS-sGNR) exhibit much improved K+ intercalation properties, such as the K+ adsorption energy, charge transfer, and migration barriers, compared with the parallel-edged GNRs. Particularly, the migration barrier (the rate-determining step) can be substantially reduced at the stepped edges during K+ intercalation. English Elsevier BV Nitrogen and sulfur co-doped graphene nanoribbons with well-ordered stepped edges for high-performance potassium-ion battery anodes Article 10.1016/j.ensm.2022.03.041 1 Energy Storage Materials, v.48, pp.325 - 334 Energy Storage Materials 48 325 334 N scie scopus 000797801000006 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article TOTAL-ENERGY CALCULATIONS LITHIUM INTERCALATION ELECTRODES GRAPHITE STORAGE POINTS SODIUM