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A Platinum Nanowire Electrocatalyst on Single-walled Carbon Nanotubes to Drive Hydrogen Evolution
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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12
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Applied Catalysis B: Environmental, Volume 265
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.
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| openaire: EC/H2020/721065/EU//CREATE
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Rajala, T, Kronberg, R, Backhouse, R, Buan, M E M, Tripathi, M, Zitolo, A, Jiang, H, Laasonen, K, Susi, T, Jaouen, F & Kallio, T 2020, 'A Platinum Nanowire Electrocatalyst on Single-walled Carbon Nanotubes to Drive Hydrogen Evolution', Applied Catalysis B: Environmental, vol. 265, 118582. https://doi.org/10.1016/j.apcatb.2019.118582