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Single-atom cobalt array bound to distorted 1T MoS2 with ensemble effect for hydrogen evolution catalysis
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Single-atom cobalt array bound to distorted 1T MoS2 with ensemble effect for hydrogen evolution catalysis
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Journal Article
Single-atom cobalt array bound to distorted 1T MoS2 with ensemble effect for hydrogen evolution catalysis
2019
Overview
The grand challenge in the development of atomically dispersed metallic catalysts is their low metal-atom loading density, uncontrollable localization and ambiguous interactions with supports, posing difficulty in maximizing their catalytic performance. Here, we achieve an interface catalyst consisting of atomic cobalt array covalently bound to distorted 1T MoS
2
nanosheets (SA Co-D 1T MoS
2
). The phase of MoS
2
transforming from 2H to D-1T, induced by strain from lattice mismatch and formation of Co-S covalent bond between Co and MoS
2
during the assembly, is found to be essential to form the highly active single-atom array catalyst. SA Co-D 1T MoS
2
achieves Pt-like activity toward HER and high long-term stability. Active-site blocking experiment together with density functional theory (DFT) calculations reveal that the superior catalytic behaviour is associated with an ensemble effect via the synergy of Co adatom and S of the D-1T MoS
2
support by tuning hydrogen binding mode at the interface.
While single-atom catalysis offers an efficient materials usage, the ambiguous interactions with supports poses a difficulty in understanding catalytic performances. Here, authors show an ensemble effect via synergy of Co adatoms and the S of MoS
2
supports to boost hydrogen evolution activities.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
