Coral-like porous microspheres comprising polydopamine-derived N-doped C-coated MoSe2 nanosheets composited with graphitic carbon as anodes for high-rate sodium- and potassium-ion batteries

Jae Seob Lee, Jin Sung Park, Kun Woo Baek, Rakesh Saroha, Su Hyun Yang, Yun Chan Kang, Jung Sang Cho

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Here, an innovative strategy for the synthesis of coral-like porous microspheres comprising polydopamine-derived N-doped C-coated MoSe2 composited with graphitic carbon (Coral MoSe2-GC@N[sbnd]C) for use as advanced anode materials for sodium- and potassium-ion batteries (SIBs and PIBs) is introduced. The prepared composite is comprised of few-layered MoSe2 particles with enlarged interlayer spacing, which are encapsulated within the graphitic carbon matrix, which acts as an efficient transport pathway for electrons. It is also characterized by the 3D interconnected pores derived from decomposition of polystyrene nanobeads, which ensure high contact area between the electrode and electrolyte and shortened sodium- and potassium-ion diffusion length. N-doped C with high electrical conductivity is coated uniformly on the surface, which plays the role of reinforcing the structural integrity as well as providing additional conductive pathway for facile electron transport. When applied as anodes for both SIBs and PIBs, the microspheres show good structural robustness and high rate capability. The anode exhibits high structural integrity, where stable cycle performance up to 200 cycles at 2.0 A/g for SIBs and 150 cycles at 1.0 A/g for PIBs was observed. In terms of rate performance, the anode exhibited high discharge capacities of 82 mA h g−1 (at 25 A/g, SIBs) and 152 mA h g−1 (at 10 A/g, PIBs), which clearly demonstrates the structural merits of the prepared microspheres.

Original languageEnglish
Article number141118
JournalChemical Engineering Journal
Volume456
DOIs
Publication statusPublished - 2023 Jan 15

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (No. NRF-2021R1A4A2001687, and NRF-2021R1I1A3057700. This work was partly supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20224000000070, Human Resource Training for Smart Energy New Industry Cluster).

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • Coral-like porous structure
  • Molybdenum diselenide anode
  • Nitrogen-doped carbon
  • Potassium-ion batteries
  • Sodium-ion batteries
  • Spray pyrolysis

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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