Ultrafine Nb2O5 Nanocrystal Coating on Reduced Graphene Oxide as Anode Material for High Performance Sodium Ion Battery

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• 作者：Litao Yan ; Gen Chen ; Swagotom Sarker ; Stephanie Richins ; Huiqiang Wang ; Weichuan Xu ; Xianhong Rui ; Hongmei Luo
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 31, 2016
• 年：2016
• 卷：8
• 期：34
• 页码：22213-22219
• 全文大小：447K
• 年卷期：0
• ISSN：1944-8252

文摘

Ultrafine niobium oxide nanocrystals/reduced graphene oxide (Nb<sub>2sub>O<sub>5sub> NCs/rGO) was demonstrated as a promising anode material for sodium ion battery with high rate performance and high cycle durability. Nb<sub>2sub>O<sub>5sub> NCs/rGO was synthesized by controllable hydrolysis of niobium ethoxide and followed by heat treatment at 450 °C in flowing forming gas. Transmission electron microscopy images showed that Nb<sub>2sub>O<sub>5sub> NCs with average particle size of 3 nm were uniformly deposited on rGO sheets and voids among Nb<sub>2sub>O<sub>5sub> NCs existed. The architecture of ultrafine Nb<sub>2sub>O<sub>5sub> NCs anchored on a highly conductive rGO network can not only enhance charge transfer and buffer the volume change during sodiation/desodiation process but also provide more active surface area for sodium ion storage, resulting in superior rate and cycle performance. Ex situ XPS analysis revealed that the sodium ion storage mechanism in Nb<sub>2sub>O<sub>5sub> could be accompanied by Nb<sup>5+sup>/Nb<sup>4+sup> redox reaction and the ultrafine Nb<sub>2sub>O<sub>5sub> NCs provide more surface area to accomplish the redox reaction.