Functionalized metal chalcogenides of partially it crystalline phase
The present disclosure relates to a composition that includes a metal chalcogenide having a surface and a ligand, where the ligand is covalently bound to the surface. In some embodiments of the present disclosure, the metal chalcogenide may be defined by MX z , where Z is between 1 and 3, inclusively, M (a metal) includes at least one of Sc, Zr, Hf, Zr, Ti, Nb, Ta, V, Mo, Cr, Re, W, S, Pt, Fe, Cu, Sb, In, Zn, Cd, P, and/or Mn, and X (a chalcogenide) includes at least one of S, Se, and/or Te.
1. A composition comprising:
a metal chalcogenide comprising MoS 2 having a surface; and
a ligand comprising a phenyl ring and a moiety, wherein:
the MoS 2 is at least partially in a 1T crystalline phase,
the ligand is covalently bound to the surface, and
the moiety comprises at least one of a halogen or (CH 3 CH 2 ) 2 N.
2. The composition of claim 1 , wherein the metal chalcogenide is in a form comprising at least one of a sheet or a particle.
3. The composition of claim 2 , wherein the sheet comprises at least one monolayer of the metal chalcogenide.
4. The composition of claim 2 , wherein the sheet has a thickness between 5.0 nm and 30 nm.
5. The composition of claim 2 , wherein the particle has a characteristic length between 5.0 nm and 50,000 nm.
6. The composition of claim 1 , wherein the ligand comprises at least one of Cl 2 Ph or BrPh.
7. The composition of claim 1 , wherein the ligand comprises at least one of an electron donating functional group or an electron withdrawing functional group, as measured by at least one of a Hammett parameter or a work function.
8. The composition of claim 7 , wherein the Hammett parameter is between −0.5 and 1.0.
9. The composition of claim 7 , wherein the work function is between 3.0 eV and 6.0 eV.
10. The composition of claim 1 , wherein:
the composition catalyzes the hydrogen evolution reaction (HER), and
the composition generates a HER catalytic current density of at least 10 mA/cm 2 when provided with an overpotential of less than 1000 mV.
11. A composition comprising:
MoS 2 in a form of at least one of a particle or a sheet; and
a ligand covalently bound to the MoS 2 , wherein:
the ligand comprises at least one of 3,5-Cl 2 Ph, p-BrPh, or p-(CH 3 CH 2 ) 2 NPh, where Ph is a phenyl ring,
the MoS 2 is it least partially in a 1T crystalline phase,
the form has a characteristic length between 5.0 nm and 50,000 nm,
the composition is characterized by a Hammett parameter between −0.5 and 1.0,
the composition catalyzes the hydrogen evolution reaction (HER), and
the composition generates a HER catalytic current density of about 10 mA/cm 2 when provided with an overpotential of less than 1000 mV.