A platinum nanowire electrocatalyst on single-walled carbon nanotubes to drive hydrogen evolution

Author(s)
T. Rajala, R. Kronberg, R. Backhouse, M. E.M. Buan, M. Tripathi, A. Zitolo, H. Jiang, K. Laasonen, T. Susi, F. Jaouen, T. Kallio
Abstract

Pertinent existing hydrogen technologies for energy storage require unsustainable amounts of scarce platinum group metals. Here, an electrocatalyst comprising high-aspect-ratio platinum nanowires (PtNWs) on single-walled carbon nanotubes (SWNTs) with ultralow Pt content (340 ngPt cm−2) is employed for hydrogen evolution reaction (HER). A comparable activity (10 mA cm−2 at −18 mV vs. RHE) to that of state-of-the-art Pt/C (38,000 ngPt cm−2) is reached in acidic aqueous electrolyte. This is attributed to favorable PtNW interaction with SWNTs and PtNW edge-sites which adsorb hydrogen optimally and aid at alleviating repulsive interactions. Moreover, the metallic nature of Pt, morphological effects and enhanced wetting contribute positively. The PtNW/SWNT relevance is emphasized at a proton-exchange-membrane electrolyzer generating stable voltage for more than 2000 h, successfully competing with the state-of-the-art reference but with one tenth of Pt mass loading. Overall, this work presents an unprecedently efficient HER catalyst and opens up avenues for PtNW/SWNT catalyzing other high-impact reactions.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Aalto University, ITM Power, L'orme des Merisiers, Institut Charles Gerhardt Montpellier
Journal
Applied Catalysis B: Environmental
Volume
265
No. of pages
12
ISSN
0926-3373
DOI
https://doi.org/10.1016/j.apcatb.2019.118582
Publication date
05-2020
Peer reviewed
Yes
Austrian Fields of Science 2012
Nanomaterials, Catalysis, Electron microscopy, Materials chemistry
Keywords
ASJC Scopus subject areas
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Portal url
https://ucris.univie.ac.at/portal/en/publications/a-platinum-nanowire-electrocatalyst-on-singlewalled-carbon-nanotubes-to-drive-hydrogen-evolution(4e3e06b4-255a-4ad6-8105-e1adef75e35a).html