Synthesis of carbon-modified cobalt disphosphide as anode for sodium-ion storage

Author(s)
Hu, Zhe
Tebyetekerwa, Mike
Elkholy, Ayman E
Xia, Qingbing
Hussain, Tanveer
Liu, Hanwen
Zhao, Xiu Song
Publication Date
2022-08-10
Abstract
<p>Phosphorus-rich metal phosphides have a high theoretical sodium-ion storage capacity. For example, cobalt disphosphide (CoP<sub>2</sub>) possesses a theoretical sodium-ion storage capacity of about 1330 mAh g<sup>−1</sup>, while the theoretical capacity of cobalt phosphide (CoP) is about 893 mAh g<sup>−1</sup>. However, it is currently challenging to synthesise phosphorus-rich metal phosphides. Herein, we report the synthesis of phosphorus-rich rod-like cobalt disphosphide with a carbon shell (CoP<sub>2</sub>@C) by thermal decomposition of polydopamine-coated cobalt oxalate in the presence of sodium hypophosphite. The as-obtained CoP<sub>2</sub>@C anode delivered a high sodium-ion storage capacity of ∼550 mAh g<sup>−1</sup> at 500 mA g<sup>−1</sup> due to its multi pseudocapacitive and intercalation charge storage mechanisms. These preliminary results show that CoP<sub>2</sub>@C hold a great promise for developing high-performance electrochemical energy storage devices based on sodium-ion as the charge carrier.</p>
Citation
Electrochimica Acta, v.423, p. 1-9
ISSN
1873-3859
0013-4686
Link
Publisher
Elsevier Ltd
Title
Synthesis of carbon-modified cobalt disphosphide as anode for sodium-ion storage
Type of document
Journal Article
Entity Type
Publication

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