TY - JOUR AU - Du, Wenyan AU - Shen, Kangqi AU - Qi, Yuruo AU - Gao, Wei AU - Tao, Mengli AU - Du, Guangyuan AU - Bao, Shu‑juan AU - Chen, Mingyang AU - Chen, Yuming AU - Xu, Maowen PY - 2021/01/05 Y2 - 2024/03/28 TI - Efficient Catalytic Conversion of Polysulfides by Biomimetic Design of “Branch-Leaf” Electrode for High-Energy Sodium–Sulfur Batteries JF - Nano-Micro Letters JA - Nano-Micro Lett VL - 13 IS - SE - Articles DO - 10.1007/s40820-020-00563-6 UR - https://nmlett.org/index.php/nml/article/view/814 SP - 50 AB - <p>Rechargeable room temperature sodium–sulfur (RT Na–S) batteries are seriously limited by low sulfur utilization and sluggish electrochemical reaction activity of polysulfide intermediates. Herein, a 3D “branch-leaf” biomimetic design proposed for high performance Na–S batteries, where the leaves constructed from Co nanoparticles on carbon nanofibers (CNF) are fully to expose the active sites of Co. The CNF network acts as conductive “branches” to ensure adequate electron and electrolyte supply for the Co leaves. As an effective electrocatalytic battery system, the 3D “branch-leaf” conductive network with abundant active sites and voids can effectively trap polysulfides and provide plentiful electron/ions pathways for electrochemical reaction. DFT calculation reveals that the Co nanoparticles can induce the formation of a unique Co–S–Na molecular layer on the Co surface, which can enable a fast reduction reaction of the polysulfides. Therefore, the prepared “branch-leaf” CNF-L@Co/S electrode exhibits a high initial specific capacity of 1201&nbsp;mAh&nbsp;g<sup>−1</sup> at 0.1&nbsp;C and superior rate performance.</p><p>Highlights:</p><p>1 3D “branch-leaf” biomimetic design is proposed for high-performance Na-S batteries.<br>2 The conductive “branch” can ensure adequate electron and electrolyte supply with the “leaf” can catalyze the conversion of polysulfides.<br>3 DFT calculation reveals that the Co nanoparticles can enable fast reduction reaction of the polysulfides;<br>4 The prepared CNF-L@Co/S electrode exhibits a high initial specific capacity of 1201 mAh g<sup>−1</sup> at 0.1 C and superior rate performance.</p> ER -