Details

Autor(en) / Beteiligte

• Li, Xinzhe
• Fang, Yiyun
• Wang, Jun
• Fang, Hanyan
• Xi, Shibo
• Zhao, Xiaoxu
• Xu, Danyun
• Xu, Haomin
• Yu, Wei
• Hai, Xiao
• Chen, Cheng
• Yao, Chuanhao
• Tao, Hua Bing
• Howe, Alexander G. R.
• Pennycook, Stephen J.
• Liu, Bin
• Lu, Jiong
• Su, Chenliang

Titel

Ordered clustering of single atomic Te vacancies in atomically thin PtTe2 promotes hydrogen evolution catalysis

Ist Teil von

• Nature communications, 2021-04, Vol.12 (1), p.2351-2351, Article 2351

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract Exposing and stabilizing undercoordinated platinum (Pt) sites and therefore optimizing their adsorption to reactive intermediates offers a desirable strategy to develop highly efficient Pt-based electrocatalysts. However, preparation of atomically controllable Pt-based model catalysts to understand the correlation between electronic structure, adsorption energy, and catalytic properties of atomic Pt sites is still challenging. Herein we report the atomically thin two-dimensional PtTe 2 nanosheets with well-dispersed single atomic Te vacancies (Te-SAVs) and atomically well-defined undercoordinated Pt sites as a model electrocatalyst. A controlled thermal treatment drives the migration of the Te-SAVs to form thermodynamically stabilized, ordered Te-SAV clusters, which decreases both the density of states of undercoordinated Pt sites around the Fermi level and the interacting orbital volume of Pt sites. As a result, the binding strength of atomically defined Pt active sites to H intermediates is effectively reduced, which renders PtTe 2 nanosheets highly active and stable in hydrogen evolution reaction.