Confinement and synergy effects of supported-confined bimetal catalysts with superior stability and catalytic activity

Sheng, Yujun, Hazmatulhaq, Farah, Mahmud, Abdullah Al, Sayed, Mostafa S., Hussain, Iftikhar, Leoni, Stefano ORCID: https://orcid.org/0000-0003-4078-1000, Al Zoubi, Wail and Ko, Young Gun 2024. Confinement and synergy effects of supported-confined bimetal catalysts with superior stability and catalytic activity. Journal of Energy Chemistry 99 , pp. 93-99. 10.1016/j.jechem.2024.07.022 Item availability restricted.

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Abstract

Bimetallic nanocrystals have attracted considerable attention because of their complicated systems, which are far superior to those of their individual constituents. A TiO2-confined PtMnP bimetallic catalyst (PtMnP@TiO2) was prepared using an ultrasonic-assisted coincident strategy, which demonstrated exceptional catalytic activity in the universal hydrogen evolution reaction (HER). Owing to the bimetallic synergistic effect and TiO2 confinement, PtMnP@TiOx showed ultrasmall metal nanoparticles (NPs), a higher active Pt0 content, adequate activation at the porous surface, and abundant acid sites. Simulations were performed to visualize the strain properties of Mn and Pt during the bending process and demonstrate the high activity of Pt. The Pt-Mn bimetallic catalysts were enriched with Pt NPs, convoyed by electron transfer from Mn to Pt. Briefly, PtMnP@TiO2 showed robust evolution reaction activities (an overpotential of 220 mV at a current density of 10 mA cm−2 and a Tafel slope of 186 mV dec−1) and the ability to contrast stated catalysts without ultrasonication-plasma. This protocol revealed that the geometrical and electronic effects of Pt and P surrounding the Mn species in PtMnP@TiO2 were crucial for increasing the catalytic activity (99%) and durability (over 20 cycles), which were far superior to those of other reported catalysts.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Publisher:	Elsevier
ISSN:	2095-4956
Date of First Compliant Deposit:	6 September 2024
Date of Acceptance:	8 July 2024
Last Modified:	08 Nov 2024 07:45
URI:	https://orca.cardiff.ac.uk/id/eprint/171897

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