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A Facile Route to Large-Area 2D Pt
Minsik Kong1,2, Zhen Zhang2, Weiyin Chen1,2
1Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
Abstract:
Platinum (Pt) is a popular hydrogen-evolution reaction (HER) catalyst, yet its high-cost limits industrial deployment. This is addressed by incorporating an oxygen-deficient, gallium (Ga)-rich gallium oxide (GaOx) adhesion layer that reverses the dewetting thermodynamics, yielding continuous 2D Pt at sub-nanometer thickness by simple direct current (DC) sputtering. Alloy anchoring and vacancy chemisorption produce mechanically robust, transparent, conductive films with high thermal stability. During HER, 2D Pt/GaOx reduces, forming a Ga-Pt that further smoothens. The 1 nm film matches bulk Pt electrocatalytic activity while sustaining 1A cm-2 for 100 h without decay. Revealing the wetting mechanism including the effect of adhesion layer, and the depositing metals, the strategy generalizes to other noble metals with adhesion layers, offering a scalable route to ultrathin catalytic and electronic platforms.
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