nz9b00382_si_001.pdf (2.05 MB)
Operando Unraveling of the Structural and Chemical Stability of P‑Substituted CoSe2 Electrocatalysts toward Hydrogen and Oxygen Evolution Reactions in Alkaline Electrolyte
journal contribution
posted on 2019-03-27, 00:00 authored by Yanping Zhu, Hsiao-Chien Chen, Chia-Shuo Hsu, Ting-Sheng Lin, Chia-Jui Chang, Sung-Chun Chang, Li-Duan Tsai, Hao Ming ChenThe question of whether
the metal chalcogenides (phosphides) that
have been acknowledged to be efficient materials for bifunctional
electrocatalysts really perform as the active species or just “pre-catalysts”
has been debated. Herein, a series of operando measurements, including
in situ X-ray absorption spectroscopy, liquid-phase transmission electron
microscopy, and in situ Raman spectroscopy, were conducted to unravel
in real time the structural and chemical stability of P-substituted
CoSe2 electrocatalysts under both hydrogen and oxygen evolution
reactions (HER and OER, respectively) in an alkaline electrolyte.
It can be conclusively revealed that, in an alkaline electrolyte,
the P-substituted CoSe2 electrocatalyst was acting as the
“pre-catalyst” rather than the real reactive species.
The introduction of phosphorus is speculated to generate more vacancies
or defects around Co cations in the initial CoSe2 and considerably
facilitates the structural transformation into the “real reactive
species”, such as metallic cobalt (for HER) and cobalt oxyhydroxide
(for OER).
History
Usage metrics
Categories
Keywords
bifunctional electrocatalystsP-substituted CoSe 2 electrocatalystsX-ray absorption spectroscopyRaman spectroscopychemical stabilityelectrolyteliquid-phase transmission electron microscopyCoSe 2HERoperando measurementsoxygen evolution reactionsChemical StabilityCo cationsOperando UnravelingOxygen Evolution Reactionsreactive speciesP-substituted CoSe 2 electrocatalystpre-catalystOERmetal chalcogenidescobalt oxyhydroxideAlkaline Electrolyte
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC