Title

Nb2O5 anode

Date

9-25-2017

Project

Energize New Mexico

Component

Solar Energy

Award Number

IIA-1301346

Document Type

Dataset

Abstract

Nb2O5 NCs/rGO was synthesized by controllable hydrolysis of niobium ethoxide and followed by heat treatment at 450 ï‚°C in flowing forming gas. Transmission electron microscopy (TEM) images showed that Nb2O5 NCs with average particle size of 3 nm were uniformly deposited on rGO sheets and voids among Nb2O5 NCs existed. The architecture of ultrafine Nb2O5 NCs anchored on highly conductive rGO network and 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 Nb2O5 could be accompanied with Nb5+/Nb4+ redox reaction and the ultrafine Nb2O5 NCs provide more surface area to accomplish the redox reaction.

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