Tunable Pt-MoSx Hybrid Catalysts for Hydrogen Evolution

Xinyi Chia, Nur Ayu Afira Sutrisnoh, Martin Pumera

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


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 rate-determining 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.

Original languageEnglish
Pages (from-to)8702-8711
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number10
Publication statusPublished - 2018 Mar 14

Bibliographical note

Funding Information:
M.P. acknowledges funding from Ministry of Education (Singapore) from Tier 1 RGT1/13. X.C. acknowledges the support from the Nanyang President Graduate Scholarship provided by Nanyang Technological University (Singapore).

Publisher Copyright:
© 2018 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


Dive into the research topics of 'Tunable Pt-MoSx Hybrid Catalysts for Hydrogen Evolution'. Together they form a unique fingerprint.

Cite this