Carbon nanofibers confined polyoxometalate derivatives as flexible self-supporting electrodes for robust sodium storage

Huixia Chao; Xiangsheng Luo; Ximing Yan; Shaobin Wang; Jinqiang Zhang

doi:10.1016/j.jcis.2023.09.178

Carbon nanofibers confined polyoxometalate derivatives as flexible self-supporting electrodes for robust sodium storage

J Colloid Interface Sci. 2024 Jan 15;654(Pt A):107-113. doi: 10.1016/j.jcis.2023.09.178. Epub 2023 Sep 29.

Authors

Huixia Chao¹, Xiangsheng Luo¹, Ximing Yan¹, Shaobin Wang², Jinqiang Zhang³

Affiliations

¹ Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou 535000, China.
² School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia.
³ School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia. Electronic address: jinqiang.zhang@adelaide.edu.au.

PMID: 37837847
DOI: 10.1016/j.jcis.2023.09.178

Abstract

Flexible self-supporting film electrodes, which eliminate the need for additional adhesive, conductive agents, or current collectors, offer significant advantages in terms of mechanical properties, specific capacity, and energy density for energy storage applications. In this study, we successfully developed a flexible film electrode by incorporating derivatives of Mo and Fe-based polyoxometalates (POMs-D) into carbon nanofibers (CNFs). The integration of CNFs significantly enhanced the structural stability of POMs-D, while the internally formed electrical field facilitated efficient electron transfer, resulting in good performance in sodium storage. The film electrode demonstrated a high capacitive contribution of 90.0 % for sodium uptake/release at a scan rate of 1.0 mV s^-1. It maintained a capacity of approximately 170 mA h g^-1 even after 8000 cycles at a current density of 3.0 A g^-1. Moreover, the film electrode exhibited a decent capacity with a 40.0-fold increase in current density, along with high power capability and energy density in sodium-ion hybrid supercapacitors, showcasing the versatility. These findings unveil the structure-functionality relationship and offer an advanced approach for developing high-performance film electrode materials, opening new possibilities in the fields of material science and energy storage.

Keywords: Carbon nanofibers confinement; Flexible self-supporting electrode; Hybrid supercapacitors; Polyoxometalate derivative; Pseudocapacitive contribution.