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 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 language | English |
|---|---|
| Pages (from-to) | 8702-8711 |
| Number of pages | 10 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 10 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2018 Mar 14 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
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Tunable Pt-MoSx Hybrid Catalysts for Hydrogen Evolution. / Chia, Xinyi; Sutrisnoh, Nur Ayu Afira; Pumera, Martin.
In: ACS Applied Materials and Interfaces, Vol. 10, No. 10, 14.03.2018, p. 8702-8711.Research output: Contribution to journal › Article
TY - JOUR
T1 - Tunable Pt-MoSx Hybrid Catalysts for Hydrogen Evolution
AU - Chia, Xinyi
AU - Sutrisnoh, Nur Ayu Afira
AU - Pumera, Martin
PY - 2018/3/14
Y1 - 2018/3/14
N2 - 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.
AB - 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.
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U2 - 10.1021/acsami.7b19346
DO - 10.1021/acsami.7b19346
M3 - Article
AN - SCOPUS:85043784414
VL - 10
SP - 8702
EP - 8711
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 10
ER -