Molybdenum Polysulfide Anchored on Porous Zr-Metal Organic Framework To Enhance the Performance of Hydrogen Evolution Reaction

Abstract

Replacement of precious platinum with efficient and low-cost catalysts for electrocatalytic hydrogen evolution reaction (HER) at low overpotentials holds tremendous promise for clean energy devices. Herein, molybdenum polysulfide (MoS x ) anchored on a porous Zr-metal organic framework (Zr-MOF, UiO-66-NH 2 ) by chemical interactions is fabricated by a facile and one-pot solvothermal method for HER application. The distinctive design of the Zr-MOF stabilized MoS x composite enables remarkable electrochemical HER activity with a Tafel slope of 59 mV•dec −1 , a lower onset potential of nearly 125 mV, and a cathode current of 10 mA•cm −2 at an overpotential of 200 mV, which also exhibits excellent durability in an acid medium. The superior HER performance should ascribe to the fast electron transport from the less conducting MoS x nanosheets to the electrode, high effective surface area, and number of active sites, as well as the favorable delivery for local protons in the porous Zr-MOF structure during the electrocatalytic reaction. Thus, this work paves a potential pathway for designing efficient Mo-based HER electrocatalysts by the combination of molybdenum polysulfide and versatile proton-conductive MOFs.

Metal–Organic Framework Based Catalysts for Hydrogen Evolution

“…[76] The loading of MoS x is simply carried out by the addition of (NH 4 ) 2 MoS 4 during the solvothermal synthesis of UiO-66-NH 2 . [76] The loading of MoS x is simply carried out by the addition of (NH 4 ) 2 MoS 4 during the solvothermal synthesis of UiO-66-NH 2 .…”

Facile Synthesis of M-MOF-74 (M=Co, Ni, Zn) and its Application as an ElectroCatalyst for Electrochemical CO2 Conversion and H2 Production

“…Recently, there have been attempts to apply metal organic frameworks (MOFs) as catalysts for the electrochemical conversion of CO 2 [25][26][27][28] and H 2 production [29,30]. MOFs are made of metal ions coordinated to organic ligands, giving rise to characteristic three-dimensionally ordered crystalline structures.…”

Pristine Transition‐Metal‐Based Metal‐Organic Frameworks for Electrocatalysis

“…For example, some MOF Fe_MOF-525 with added trifluoroethanol (blue curve). [130] The specific properties of MOFs can be achieved by changing the metal ions or organic linkers, as well as the surface area and controllable structure. (0.3 M trichloroacetic).…”

“…With regard to MOFs, many [130] NU-1000_Ni-S 0.5 M H 2 SO 4 0.150 b 238 111 [131] a η 10 represents the overpotential at current density of 10 mA cm À 2 ; b The value was calculated by Liao et al in their review. They are 2H + (aq) + 2e À !H 2 (g) in the acidic solutions and 2H 2 O (l) + 2e À !H 2 (g) + 2OH À (aq) in the alkaline solutions.…”

“…The SEM image of one of the synthesized MOF-525 powders is shown in Figure 11d. [130] Copyright 2016, American Chemical Society. As shown in [131] Copyright 2015, Nature.…”