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Rose-like Ni-Co-Mn-S@N-CDs electrode material for flexible hybrid supercapacitors with high electrochemical performance
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  • Bin Lu,
  • Guotao Xiang,
  • Jialei Xu,
  • Ruidong Shi,
  • Na Chen,
  • Yongda Hu,
  • D. Rodriguez,
  • Jinju Chen
Bin Lu
UESTC
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Guotao Xiang
UESTC
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Jialei Xu
UESTC
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Ruidong Shi
UESTC
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Na Chen
UESTC
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Yongda Hu
UESTC
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D. Rodriguez
Tomsk Polytechnic University
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Jinju Chen
UESTC

Corresponding Author:[email protected]

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Abstract

Ternary transition metal sulfides are extensively considered as supercapacitor electrode materials due to their remarkable electrochemical properties. However, inferior electrical conductivity and structural stability severely limit their applications. Here, we address these limitations by introducing N-doped carbon dots (N-CDs) into Ni-Co-Mn-S nanoflowers via a two-step hydrothermal process followed by electrodeposition. Ni-Co-Mn-S nanoflowers feature a skeleton structure supporting rich ion transfer paths and abundant active sites, while electrodeposited N-CDs increase the electrical conductivity and enhance the cycling performance. The resulting Ni-Co-Mn-S@N-CDs material demonstrates a remarkable specific capacity of 2267 F g–1 at 1 A g–1 and maintains 96.2% capacity after 10000 cycles at 10 A g–1. Moreover, this electrode material allows the development of hybrid supercapacitors with an impressive energy density of 61.6 Wh kg–1 at 800 W kg–1 and a superior capacitance retention of 89.0% after 20,000 charge/discharge cycles at 5 A g–1, alongside an excellent flexibility under various deformations. These findings represent a significant advancement in hybrid solid-state supercapacitors with promising implications for flexible energy storage technologies.