In:
Angewandte Chemie International Edition, Wiley, Vol. 59, No. 35 ( 2020-08-24), p. 15232-15237
Kurzfassung:
The key descriptor that dominates the kinetics of the alkaline hydrogen evolution reaction (HER) has not yet been unequivocally identified. Herein, we focus on the adsorbed hydroxyl (OH ad ) transfer process (OH ad + e − ⇄ OH − ) and reveal its crucial role in promoting the overall kinetics of alkaline HER based on Ni/Co‐modified MoSe 2 model catalysts (Ni‐MoSe 2 and Co‐MoSe 2 ) that feature almost identical water dissociation and hydrogen adsorption energies, but evidently different activity trends in alkaline (Ni‐MoSe 2 ≫ Co‐MoSe 2 ) and acidic (Co‐MoSe 2 ≥ Ni‐MoSe 2 ) media. Experimental and theoretical calculation results demonstrate that tailoring MoSe 2 with Ni not only optimizes the hydroxyl adsorption, but also promotes the desorption of OH − and the electron‐involved conversion of OH ad to OH − , all of which synergistically accelerate the kinetics of OH ad + e − ⇄ OH − and thereby the overall kinetics of the alkaline HER.
Materialart:
Online-Ressource
ISSN:
1433-7851
,
1521-3773
DOI:
10.1002/anie.202006722
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2020
ZDB Id:
2011836-3
ZDB Id:
123227-7
