Projects per year
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.
|Number of pages||12|
|Journal||Applied Catalysis B: Environmental|
|Publication status||Published - 15 May 2020|
|MoE publication type||A1 Journal article-refereed|
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- 1 Finished
CREATE: Critical Raw materials Elimination by a top-down Approach To hydrogen and Electricity generation
Kallio, T., Ali, F., Buan, M. E. M., Davodi, F., Sorsa, O., Revitzer, H., Rajala, T. & Han, N.
01/01/2017 → 31/12/2020
Project: EU: Framework programmes funding
Anna Rissanen (Manager)Aalto University
OtaNano - Nanomicroscopy Center
Jani Seitsonen (Manager)OtaNano
Raw Materials Research Infrastructure
Maarit Karppinen (Manager)School of Chemical Engineering