Journal
ACS CATALYSIS
Volume 2, Issue 5, Pages 746-750Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs3000107
Keywords
base-inhibited vapor-phase polymerization (BI-VPP); PEDOT; PEDOT-PEG; conducting polymer; hydrogen evolution reaction
Categories
Funding
- National Science Foundation [CH-1111518]
- Robert A. Welch Foundation [F-1621, F-0021]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1111518] Funding Source: National Science Foundation
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Studies of the hydrogen evolution reaction (HER) were carried out on base-inhibited vapor phase polymerized (BI-VPP) poly(3,4-ethylenedioxythiophene) (PEDOT)-poly(ethylene glycol) (PEG) thin films synthesized on several substrates, including gold, glassy carbon, and titanium, in an acidic electrolyte. The proton reduction overpotential became smaller and the current potential (i-E) scans moved toward the thermodynamic potential with time. However, they did not move below the proton reduction potential of the substrate. Collectively, the results suggested to us that the polymer film was porous and that the porosity increased with time when the electrode was immersed in solution, with the hydrogen evolution catalysis taking place on the conducting substrate beneath the polymer rather than on our BI-VPP PEDOT-PEG thin films. Comparison of the HER on gold substrates with different impurities was also studied and traces of Pt and Pd at the ppm level significantly improved the HER activity of Au.
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