Na-Ions Diffusion Impacts Supercapacitor Performance for Amaryllis-like NiCo2O4 Nanostructures

Guiwu Liu; Shaofeng Bai; Shahid Hussain; Kuibao Zhang; Liyang Lin; Tongtong Li; Cheng He; Ziwei Xu; Guanjun Qiao

doi:10.1021/acs.inorgchem.9b01640

Na-Ions Diffusion Impacts Supercapacitor Performance for Amaryllis-like NiCo₂O₄ Nanostructures

Inorg Chem. 2019 Aug 19;58(16):11110-11117. doi: 10.1021/acs.inorgchem.9b01640. Epub 2019 Jul 31.

Authors

Guiwu Liu¹, Shaofeng Bai¹, Shahid Hussain¹, Kuibao Zhang², Liyang Lin³, Tongtong Li⁴, Cheng He⁴, Ziwei Xu¹, Guanjun Qiao^{1

4}

Affiliations

¹ School of Materials Science and Engineering , Jiangsu University , Zhenjiang 212013 , China.
² State Key Laboratory of Environment-Friendly Energy Materials & School of Material Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China.
³ College of Aerospace Engineering , Chongqing University , Chongqing 400044 , China.
⁴ State Key Laboratory for Mechanical Behavior of Materials , Xi'an Jiaotong University , Xi'an 710049 , China.

PMID: 31365244
DOI: 10.1021/acs.inorgchem.9b01640

Abstract

NiCo₂O₄ nanomaterials with exceptional electrochemical performances are synthesized via a simple and low-cost method. The synthesized nanostructures exhibit a high specific surface area of 121.52 m² g^-1 and excellent specific capacitance of 2498.49 F g^-1 at a current density of 2 A g^-1, an energy density of 79 Wh kg^-1, and power density of 3570 W kg^-1. The remarkable cycling stability of 92.61% retention after 5000 cycles demonstrates that NiCo₂O₄ nanomaterials have a potential for practical application in energy storage devices. The Na⁺ ion diffusion (by VASP) affirms a low activation energy barrier for Na ion intercalations onto the electrode material, illuminating excellent electrochemical performances.