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- Title
Single-atom cobalt array bound to distorted 1T MoS<sub>2</sub> with ensemble effect for hydrogen evolution catalysis.
- Authors
Qi, Kun; Cui, Xiaoqiang; Gu, Lin; Yu, Shansheng; Fan, Xiaofeng; Luo, Mingchuan; Xu, Shan; Li, Ningbo; Zheng, Lirong; Zhang, Qinghua; Ma, Jingyuan; Gong, Yue; Lv, Fan; Wang, Kai; Huang, Haihua; Zhang, Wei; Guo, Shaojun; Zheng, Weitao; Liu, Ping
- Abstract
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 MoS2 nanosheets (SA Co-D 1T MoS2). The phase of MoS2 transforming from 2H to D-1T, induced by strain from lattice mismatch and formation of Co-S covalent bond between Co and MoS2 during the assembly, is found to be essential to form the highly active single-atom array catalyst. SA Co-D 1T MoS2 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 MoS2 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 MoS2 supports to boost hydrogen evolution activities.
- Subjects
ACOUSTIC arrays; COBALT; HYDROGEN evolution reactions; CATALYSTS; DENSITY functional theory
- Publication
Nature Communications, 2019, Vol 10, Issue 1, pN.PAG
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-019-12997-7