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- W4200633295 abstract "In this work, the thickness dependence of the activity in the hydrogen evolution reaction (HER) of SnTe (001) thin films was studied. It was found that the 70 nm SnTe thin film exhibits the best HER performances, which is attributed to its largest active area as revealed by atomic force microscopy imaging and its greatest electrochemical surface area estimated from the double layer capacitance measurements using cyclic voltammetry. A Pd(20nm)/SnTe(70nm) heterostructure, of which the Pd layer being deposited ex situ to avoid Pd1-x-ySnxTey compound formation, was shown to have much higher electrocatalytic activity than that of a pure Pd(20nm) thin film and even better than that of a commercial Pt foil. It was revealed that the heterostructure enjoys a much higher intrinsic activity per Pd site than that of the Pd(20nm) thin film as reflected by the fact that the extracted turnover frequency value of the heterostructures is more than twice higher than that of the Pd(20nm) thin film at a potential of 0.2 V. Our density functional theory calculations reveal that electrons may transfer from both the Pd surface and the adsorbed H atoms to the topological surface states of the SnTe (001) underlayer, resulting in weaker Pd-H binding strength and more favorable hydrogen adsorption free energies. This work demonstrates that the Pd/SnTe heterostructure could be a prominent substitute as a catalyst for replacing commercial Pt foil and offers a promising direction to optimize the performance of electrocatalysts based on topological quantum materials." @default.
- W4200633295 created "2021-12-31" @default.
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- W4200633295 date "2021-12-09" @default.
- W4200633295 modified "2023-09-28" @default.
- W4200633295 title "Highly active hydrogen evolution facilitated by topological surface states on a Pd/SnTe metal/topological crystalline insulator heterostructure" @default.
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