Stabilising Cobalt Sulphide Nanocapsules with Nitrogen-Doped Carbon for High-Performance Sodium-Ion Storage

Yilan Wu; Rohit R Gaddam; Chao Zhang; Hao Lu; Chao Wang; Dmitri Golberg; Xiu Song Zhao

doi:10.1007/s40820-020-0391-9

Stabilising Cobalt Sulphide Nanocapsules with Nitrogen-Doped Carbon for High-Performance Sodium-Ion Storage

Nanomicro Lett. 2020 Feb 12;12(1):48. doi: 10.1007/s40820-020-0391-9.

Authors

Yilan Wu^#¹, Rohit R Gaddam^#¹, Chao Zhang², Hao Lu¹, Chao Wang³, Dmitri Golberg², Xiu Song Zhao^{4

5}

Affiliations

¹ School of Chemical Engineering, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia.
² School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD, 4001, Australia.
³ Institute of Materials for Energy and Environment, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao, 266071, People's Republic of China.
⁴ School of Chemical Engineering, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia. george.zhao@uq.edu.au.
⁵ Institute of Materials for Energy and Environment, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao, 266071, People's Republic of China. george.zhao@uq.edu.au.

^# Contributed equally.

Abstract

Cobalt sulphide nanoparticles are encapsulated in nitrogen-rich carbon cages via a simple and scalable method.
Insight into sodium storage mechanism is systematically studied via in situ TEM and XRD techniques.
The sodium-ion capacitor device achieved high energy densities of 101.4 and 45.8 Wh kg⁻¹ at power densities of 200 and 10,000 W kg⁻¹, respectively, holding promise for practical applications.

Electronic supplementary material: The online version of this article (10.1007/s40820-020-0391-9) contains supplementary material, which is available to authorized users.

Keywords: Cobalt sulphide; Core–shell structure; Nitrogen-doped carbon; Sodium-ion capacitors.