Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202208642
Keywords
Charge Balance Effect; DFT Calculation; Heterostructure Engineering; Hydrogen Evolution; Os-Based Electrocatalyst Electrocatalysis
Categories
Funding
- National Natural Science Foundation of China [22075223, 22179104]
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology) [2022-ZD-4]
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The heterostructural Os-OsSe2 with neutralized work function balances the electronic state between strong and weak adsorbents, optimizing the hydrogen evolution reaction activity of Os sites. This new model provides a rational selection of heterocomponents for potential applications.
Theoretical calculations unveil that the formation of Os-OsSe2 heterostructures with neutralized work function (WF) perfectly balances the electronic state between strong (Os) and weak (OsSe2) adsorbents and bidirectionally optimizes the hydrogen evolution reaction (HER) activity of Os sites, significantly reducing thermodynamic energy barrier and accelerating kinetics process. Then, heterostructural Os-OsSe2 is constructed for the first time by a molten salt method and confirmed by in-depth structural characterization. Impressively, due to highly active sites endowed by the charge balance effect, Os-OsSe2 exhibits ultra-low overpotentials for HER in both acidic (26 mV @ 10 mA cm(-2)) and alkaline (23 mV @ 10 mA cm(-2)) media, surpassing commercial Pt catalysts. Moreover, the solar-to-hydrogen device assembled with Os-OsSe2 further highlights its potential application prospects. Profoundly, this special heterostructure provides a new model for rational selection of heterocomponents.
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