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Synthesis of carbon-modified cobalt disphosphide as anode for sodium-ion storage |
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10.1016/j.electacta.2022.140611 |
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Phosphorus-rich metal phosphides have a high theoretical sodium-ion storage capacity. For example, cobalt disphosphide (CoP2) possesses a theoretical sodium-ion storage capacity of about 1330 mAh g−1, while the theoretical capacity of cobalt phosphide (CoP) is about 893 mAh g−1. 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 (CoP2@C) by thermal decomposition of polydopamine-coated cobalt oxalate in the presence of sodium hypophosphite. The as-obtained CoP2@C anode delivered a high sodium-ion storage capacity of ∼550 mAh g−1 at 500 mA g−1 due to its multi pseudocapacitive and intercalation charge storage mechanisms. These preliminary results show that CoP2@C hold a great promise for developing high-performance electrochemical energy storage devices based on sodium-ion as the charge carrier. |
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Electrochimica Acta, v.423, p. 1-9 |
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