Simultaneous texturing and conductivity tailoring of mesoporous NaTi2(PO4)3 nanocrystals by gadolinium doping for enhanced Na storage

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • G. B. Xu
  • Z. Chen
  • X. Liu
  • Y. Zhang
  • X. L. Wei
  • L. W. Yang

Detail(s)

Original languageEnglish
Pages (from-to)177-186
Journal / PublicationElectrochimica Acta
Volume309
Online published14 Apr 2019
Publication statusPublished - 20 Jun 2019

Abstract

Doping is an effective method to produce hybrid materials with desirable properties and functions. Herein, gadolinium ions (Gd3+ )are introduced to substitute Ti in mesoporous NaTi2(PO4)3 (MNTP )nanocrystals to tailor the texture and conductivity simultaneously to improve Na storage properties. Microstructure characterization and kinetics analysis reveal that the superior electrochemical characteristics arise from the expanded cell, optimized porous structure, enhanced intrinsic electron conductivity, and better Na ion mobility as a result of Gd3+ introduction into the MNTP nanocrystals. In the half cells for sodium-ion battery, the MNTP nanocrystals with 5% Gd3+ exhibit a large ICE beyond 97% at 1 C, superior rate capability of 47.5 mAhg−1 at 50 C, and long cycling life time (>75% capacity retention at 5 C after 2000 cycles). Furthermore, using the Gd3+ doped MNTP nanocrystals as the anode and activated carbon as the cathode, the assembled sodium-ion hybrid capacitor shows a high energy density of 63 Whkg−1 at a power density of 46 Wkg-1 . Even at a large current rate of 5 Ag−1 , a stable capacity is maintained after 30,000 cycles without obvious degradation. Gadolinium ion doping provides a new technique to improve the electrochemical properties of NASICON-type anodes in sodium-based energy storage devices.

Research Area(s)

  • Doping, Gadolinium ion, Mesoporous nanocrystals, NASICON-type NaTi 2 (PO 4 ) 3, Sodium-based energy storage devices

Citation Format(s)

Simultaneous texturing and conductivity tailoring of mesoporous NaTi2(PO4)3 nanocrystals by gadolinium doping for enhanced Na storage. / Xu, G. B.; Chen, Z.; Liu, X.; Zhang, Y.; Wei, X. L.; Yang, L. W.; Chu, Paul K.

In: Electrochimica Acta, Vol. 309, 20.06.2019, p. 177-186.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review