Double-Helix Structure in Carrageenan-Metal Hydrogels: A General Approach to Porous Metal Sulfides/Carbon Aerogels with Excellent Sodium-Ion Storage

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• 作者：Daohao Li ; Prof. Dongjiang Yang ; Prof. Xianfeng Yang ; Yu Wang ; Ziqi Guo ; Prof. Yanzhi Xia ; Dr. Shenglei Sun and Prof. Shaojun Guo
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：December 19, 2016
• 年：2016
• 卷：55
• 期：51
• 页码：15925-15928
• 全文大小：6094K
• ISSN：1521-3773

文摘

The metal sulfide-carbon nanocomposite is a new class of anode material for sodium ion batteries, but its development is restricted by its relative poor rate ability and cyclic stability. Herein, we report the use of double-helix structure of carrageenan–metal hydrogels for the synthesis of 3D metal sulfide (M_xS_y) nanostructure/carbon aerogels (CAs) for high-performance sodium-ion storage. The method is unique, and can be used to make multiple M_xS_y/CAs (such as FeS/CA, Co₉S₈/CA, Ni₃S₄/CA, CuS/CA, ZnS/CA, and CdS/CA) with ultra-small nanoparticles and hierarchical porous structure by pyrolyzing the carrageenan–metal hydrogels. The as-prepared FeS/CA exhibits a high reversible capacity and excellent cycling stability (280 mA h⁻¹ at 0.5 A g⁻¹ over 200 cycles) and rate performance (222 mA h⁻¹ at 5 A g⁻¹) when used as the anode material for sodium-ion batteries. The work shows the value of biomass-derived metal sulfide–carbon heterostuctures in sodium-ion storage.