Identification of Interface Structure for a Topological CoS2 Single Crystal in Oxygen Evolution Reaction with High Intrinsic Reactivity

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung



Transition metal chalcogenides such as CoS 2have been reported as competitive catalysts for oxygen evolution reaction. It has been well confirmed that surface modification is inevitable in such a process, with the formation of different re-constructed oxide layers. However, which oxide species should be responsible for the optimized catalytic efficiencies and the detailed interface structure between the modified layer and precatalyst remain controversial. Here, a topological CoS 2single crystal with a well-defined exposed surface is used as a model catalyst, which makes the direct investigation of the interface structure possible. Cross-sectional transmission electron microscopy of the sample reveals the formation of a 2 nm thickness Co 3O 4layer that grows epitaxially on the CoS 2surface. Thick CoO pieces are also observed and are loosely attached to the bulk crystal. The compact Co 3O 4interface structure can result in the fast electron transfer from adsorbed O species to the bulk crystal compared with CoO pieces as evidenced by the electrochemical impedance measurements. This leads to the competitive apparent and intrinsic reactivity of the crystal despite the low surface geometric area. These findings are helpful for the understanding of catalytic origins of transition metal chalcogenides and the designing of high-performance catalysts with interface-phase engineering.


Seiten (von - bis)19324-19331
FachzeitschriftACS Applied Materials Interfaces
PublikationsstatusVeröffentlicht - 25 Apr. 2022

Externe IDs

Scopus 85129324427
unpaywall 10.1021/acsami.1c24966
PubMed 35468289
Mendeley 6a31513a-9717-3f7f-8933-9b821b9b0011
WOS 000813067500001
ORCID /0000-0002-4859-4325/work/142253307


Fächergruppen, Lehr- und Forschungsbereiche, Fachgebiete nach Destatis

ASJC Scopus Sachgebiete


  • cobalt disulfide, cobalt oxide, interface structure, oxygen evolution reaction, topological metal