Synergistic Doping and Intercalation: Realizing Deep Phase Modulation on MoS₂ Arrays for High‐Efficiency Hydrogen Evolution Reaction

Abstract

As ynergistic Nd oping plus PO 4 3À intercalation strategy is used to induce high conversion (ca. 41 %) of 2H-MoS 2 into 1T-MoS 2 ,which is muchhigher than single Ndoping (ca. 28 %) or single PO 4 3À intercalation (ca. 10 %). Ascattering mechanism is proposed to illustrate the synergistic phase transformation from the 2H to the 1T phase,w hich was confirmed by synchrotron radiation and spherical aberration TEM. To further enhance reaction kinetics,t he designed (N,PO 4 3À )-MoS 2 nanosheets are combined with conductive vertical graphene (VG) skeleton forming binder-free arrays for high-efficiency hydrogen evolution reaction (HER). Owing to the decreased band gap,l ower d-band center,a nd smaller hydrogen adsorption/desorption energy,t he designed (N,PO 4 3À )-MoS 2 /VGe lectrode shows excellent HER performance with al ower Tafel slope and overpotential than N-MoS 2 /VG, PO 4 3À -MoS 2 /VGc ounterparts,a nd other Mo-base catalysts in the literature.

Boosting fast energy storage by synergistic engineering of carbon and deficiency

“…XANES spectra (Ti L-edge) were measured at beamline station BL12B in National Synchrotron Radiation Laboratory (NSRL, operated at 800 MeV with a maximum current of 300 mA) of China. The samples were placed on double-sided carbon tape for X-ray spectroscopy and all spectra were obtained with the TEY mode 37 . The "a.u."…”

Introducing Oxygen Defects into Phosphate Ions Intercalated Manganese Dioxide/Vertical Multilayer Graphene Arrays to Boost Flexible Zinc Ion Storage

“…But the adopted substrate was rigid TiC/C‐Ti 6 Al 4 V, which could not be used as flexible configuration. Meanwhile, it is reported that PO 4 3− ion intercalation can induce defects on metal sulfides/oxides (e.g., MoS 2 , Co 3 O 4 ) to achieve enhanced intrinsic reaction kinetics. Inspired by these results, it would be very interesting to explore PO 4 3− ion intercalated MnO 2 /VMG arrays and their flexible zinc ion storage performance, but not reported as yet.…”

An integrated electrode based on nanoflakes of MoS2 on carbon cloth for enhanced lithium storage

“…Two peaks at around 229.6 and 232.9 eV can be ascribed to Mo 3d 5/2 and Mo 3d 3/2 , respectively, revealing that molybdenum is in its Mo(IV) state. 26,27 Two peaks which are located at 162.6 and 163.7 eV can be ascribed to S 2p 3/2 and S 2p 1/2 , respectively. 28 These results indicate the presence of Mo 4+ and S 2À species within the CC@MoS 2 precursor.…”