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|Title:||W Doping in Ni12P5as a Platform to Enhance Overall Electrochemical Water Splitting|
Kadam, S. R.
Enyashin, A. N.
|Publisher:||American Chemical Society|
American Chemical Society (ACS)
|Citation:||W Doping in Ni12P5as a Platform to Enhance Overall Electrochemical Water Splitting / S. Ghosh, S. R. Kadam, S. Kolatkar et al. — DOI 10.3367/UFNe.2020.12.038898 // ACS Applied Materials and Interfaces. — 2022. — Vol. 14. — Iss. 1. — P. 581-589.|
|Abstract:||Bifunctional electrocatalysts for efficient hydrogen generation from water splitting must overcome both the sluggish water dissociation step of the alkaline hydrogen evolution half-reaction (HER) and the kinetic barrier of the anodic oxygen evolution half-reaction (OER). Nickel phosphides are a promising catalysts family and are known to develop a thin active layer of oxidized Ni in an alkaline medium. Here, Ni12P5 was recognized as a suitable platform for the electrochemical production of γ-NiOOH-a particularly active phase-because of its matching crystallographic structure. The incorporation of tungsten by doping produces additional surface roughness, increases the electrochemical surface area (ESCA), and reduces the energy barrier for electron-coupled water dissociation (the Volmer step for the formation of Hads). When serving as both the anode and cathode, the 15% W-Ni12P5 catalyst provides an overall water splitting current density of 10 mA cm-2 at a cell voltage of only 1.73 V with good durability, making it a promising bifunctional catalyst for practical water electrolysis. © 2021 American Chemical Society.|
OXYGEN EVOLUTION REACTION
|metadata.dc.description.sponsorship:||S.G. and S.K. thank the financial support of the Kreitman Post- Doctoral fellowship at the BGU. This center of excellence was supported by The Israel Science Foundation (grant no. 1212/21).|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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