Publication detail

Tunable Pt−MoSx Hybrid Catalysts for Hydrogen Evolution

CHIA, X. SUTRISNOH, N. PUMERA, M.

Original Title

Tunable Pt−MoSx Hybrid Catalysts for Hydrogen Evolution

Type

journal article in Web of Science

Language

English

Original Abstract

Platinum (Pt)-based materials are inevitably among the best-performing electrocatalysts for hydrogen evolution reaction (HER). MoS2 was suggested to be a potent HER catalyst to replace Pt in this reaction by theoretical modeling; however, in practice, this dream remains elusive. Here we show a facile one-pot bottom-up synthesis of Pt−MoSx composites using electrochemical reduction in an electrolytic bath of Pt precursor and ammonium tetrathiomolybdate under ambient conditions. By modifying the millimolar concentration of Pt precursors, composites of different surface elemental composition are fabricated; specifically, Pt1.8MoS2, Pt0.1MoS2.5, Pt0.2MoS0.6, and Pt0.3MoS0.8. All electrodeposited Pt−MoSx hybrids showcase low overpotentials and small Tafel slopes that outperform MoS2 as an electrocatalyst. Tantamount to electrodeposited Pt, the rate-limiting process in the HER mechanism is determined to be the Heyrovsky desorption across Pt−MoSx hybrids and starkly swings from the ratedetermining Volmer adsorption step in MoS2. The Pt−MoSx composites are equipped with catalytic performance that closely mirrors that of electrodeposited Pt, in particular the HER kinetics for Pt1.8MoS2 and Pt0.1MoS2.5. This work advocates electrosynthesis as a cost-effective method for catalyst design and fabrication of competent composite materials for water splitting applications.

Keywords

molybdenum disulfide, platinum, doping, electrodeposition, hydrogen evolution

Authors

CHIA, X.; SUTRISNOH, N.; PUMERA, M.

Released

14. 3. 2018

ISBN

1944-8244

Periodical

ACS APPL MATER INTER

Year of study

10

Number

10

State

United States of America

Pages from

8702

Pages to

8711

Pages count

10

URL

https://pubs.acs.org/doi/abs/10.1021/acsami.7b19346

BibTex

@article{BUT157017,
  author="Xinyi {Chia} and Nur Ayu Afira {Sutrisnoh} and Martin {Pumera}",
  title="Tunable Pt−MoSx Hybrid Catalysts for Hydrogen Evolution",
  journal="ACS APPL MATER INTER",
  year="2018",
  volume="10",
  number="10",
  pages="8702--8711",
  doi="10.1021/acsami.7b19346",
  issn="1944-8244",
  url="https://pubs.acs.org/doi/abs/10.1021/acsami.7b19346"
}