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Unconventional Pore and Defect Generation in Molybdenum Disulfide: Application in High‐Rate Lithium‐Ion Batteries and the Hydrogen Evolution Reaction
Author(s) -
Zhang Kan,
Kim HwanJin,
Lee JeongTaik,
Chang GeeWoo,
Shi Xinjian,
Kim Wanjung,
Ma Ming,
Kong Kijeong,
Choi JaeMan,
Song MinSang,
Park Jong Hyeok
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402372
Subject(s) - tafel equation , overpotential , materials science , graphene , cobalt , lithium (medication) , chemical engineering , oxide , nanomesh , electrochemistry , molybdenum disulfide , nanosheet , anode , cobalt oxide , inorganic chemistry , nanotechnology , chemistry , electrode , metallurgy , medicine , endocrinology , engineering
A 2H‐MoS 2 (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 MoS 2 nanomesh/RGO foam (Dr‐MoS 2 Nm/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‐MoS 2 Nm/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 MoS 2 and 2 mol % Co to Mo), and significantly achieves 810 mA h g −1 at a high current density of 9.46 A g −1 over at least 150 cycles. Moreover, Dr‐MoS 2 Nm/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 MoS 2 nanosheet/RGO (MoS 2 Ns/RGO), which is synthesized in the absence of cobalt ions, Dr‐MoS 2 Nm/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 CoMoS atomic structure, releasing inert basal planes to active sites.