Unconventional Pore and Defect Generation in Molybdenum Disulfide: Application in High-Rate Lithium-Ion Batteries and the Hydrogen Evolution Reaction

Kan Zhang, Hwan Jin Kim, Jeong Taik Lee, Gee Woo Chang, Xinjian Shi, Wanjung Kim, Ming Ma, Ki Jeong Kong, Jae Man Choi, Min Sang Song, Jong Hyeok Park

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Abstract

A 2H-MoS2(H=hexagonal) ultrathin nanomesh with high defect generation and large porosity is demonstrated to improving electrochemical performance, including in lithium-ion batteries (LIBs) and the hydrogen evolution reaction (HER), with the aid of a 3D reduced graphene oxide (RGO) scaffold as fast electron and ion channels. The 3D defect-rich MoS2nanomesh/RGO foam (Dr-MoS2Nm/RGO) can be easily obtained through a one-pot cobalt acetate/graphene oxide (GO) co-assisted hydrothermal reaction, in which GO, cobalt and acetate ions are co-morphology-controlling agents and defect inducers. As an anode material for LIBs, Dr-MoS2Nm/RGO has only a 9 % capacity decay at a 10 C discharge rate versus 0.2 C with stable cyclability at the optimized composition (5 wt % RGO to MoS2and 2 mol % Co to Mo), and significantly achieves 810 mA h g−1at a high current density of 9.46 A g−1over at least 150 cycles. Moreover, Dr-MoS2Nm/RGO exhibits superior activity for the HER with an overpotential as low as 80 mV and a Tafel slope of about 36 mV per decade. In contrast to the MoS2nanosheet/RGO (MoS2Ns/RGO), which is synthesized in the absence of cobalt ions, Dr-MoS2Nm/RGO provides high interconnectivity for efficient lithium-ion transport, and rich defects as electrochemically active sites. DFT is used to prove the existence of rich defects due to anion replacement to become a CoMoS atomic structure, releasing inert basal planes to active sites.

Original languageEnglish
Pages (from-to)2489-2495
Number of pages7
JournalChemSusChem
Volume7
Issue number9
DOIs
Publication statusPublished - 2014 Jan 1

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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    Zhang, K., Kim, H. J., Lee, J. T., Chang, G. W., Shi, X., Kim, W., Ma, M., Kong, K. J., Choi, J. M., Song, M. S., & Park, J. H. (2014). Unconventional Pore and Defect Generation in Molybdenum Disulfide: Application in High-Rate Lithium-Ion Batteries and the Hydrogen Evolution Reaction. ChemSusChem, 7(9), 2489-2495. https://doi.org/10.1002/cssc.201402372