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- Title
Embedding Amorphous Molybdenum Sulfide within a Porous Poly(3,4‐ethylenedioxythiophene) Matrix to Enhance its H<sub>2</sub>‐evolving Catalytic Activity and Robustness.
- Authors
Nguyen, Anh D.; Pham, Phuong T.; Tran, Dai C.; Nguyen, Loan T.; Tran, Phong D.
- Abstract
Amorphous molybdenum sulfide (MoSx) is a promising alternative to Pt catalyst for the H2 evolution in water. However, it is suffered of an electrochemical corrosion. In this report, we present a strategy to tack this issue by embedding the MoSx catalyst within a porous poly(3,4‐ethylenedioxythiophene) (PEDOT) matrix. The PEDOT host is firstly grown onto a fluorine‐doped tin oxide (FTO) electrode by electrochemical polymerization of EDOT monomer in an acetonitrile solution to perform a porous structure. The MoSx catalyst is subsequently deposited onto the PEDOT by an electrochemical oxidation of [MoS4]2− monomer. In a 0.5 M H2SO4 electrolyte solution, the MoSx/PEDOT shows higher H2‐evolving catalytic activities (current density of 34.2 mA/cm2 at −0.4 V vs RHE) in comparison to a pristine MoSx grown on a planar FTO electrode having similar catalyst loading (24.2 mA/cm2). The PEDOT matrix contributes to enhance the stability of MoSx catalyst by a significant manner. As such, the MoSx/PEDOT retains 81 % of its best catalytic activity after 1000 potential scans from 0 to −0.4 V vs. RHE, whereas a planar MoSx catalyst is completely degraded after about 240 potential scans, due to its complete corrosion.
- Subjects
MOLYBDENUM sulfides; CATALYTIC activity; CATALYSTS; ELECTROLYTIC corrosion; ELECTROLYTE solutions; ELECTROCHEMICAL electrodes
- Publication
Chemistry - An Asian Journal, 2020, Vol 15, Issue 19, p2996
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.202000795