Improving NiFe Electrocatalysts through Fluorination‐Driven Rearrangements for Neutral Water Electrolysis

Neutral electrolysis to produce hydrogen is prime challenging owing to the sluggish kinetics of water dissociation for the electrochemical reduction of water to molecular hydrogen. An ion‐enriched electrode/electrolyte interface for electrocatalytic reactions can efficiently obtain a stable electrol...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-07, Vol.20 (28), p.e2310642-n/a
Main Authors: Yu, Jidong, Li, Jiamin, Gao, Rui‐Ting, Yang, Yang, Wang, Lei
Format: Article
Language:English
Subjects:
Adsorption
Catalysts
Chemical bonds
Chemical reactions
Chemical reduction
Current density
Electrocatalysts
Electrodes
Electrolysis
Fluorides
Fluorination
Hydrogen evolution reactions
interfacial fluorine ions
Intermetallic compounds
Iron compounds
large current density
long‐term stability
Nanoparticles
neutral water splitting
Nickel compounds
NiFe hydroxide catalysts
Platinum
platinum single atom/nanoparticles
Reduction (electrolytic)
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Summary:Neutral electrolysis to produce hydrogen is prime challenging owing to the sluggish kinetics of water dissociation for the electrochemical reduction of water to molecular hydrogen. An ion‐enriched electrode/electrolyte interface for electrocatalytic reactions can efficiently obtain a stable electrolysis system. Herein, we found that interfacial accumulated fluoride ions and the anchored Pt single atoms/nanoparticles in catalysts can improve hydrogen evolution reaction (HER) activity of NiFe‐based hydroxide catalysts, prolonging the operating stability at high current density in neutral conditions. NiFe hydroxide electrode obtains an outstanding performance of 1000 mA cm−2 at low overpotential of 218 mV with 1000 h operation at 100 mA cm−2. Electrochemical experiments and theoretical calculations have demonstrated that the interfacial fluoride contributes to promote the adsorption of Pt to proton for sustaining a large current density at low potential, while the Pt single atoms/nanoparticles provide H adsorption sites. The synergy effect of F and Pt species promotes the formation of Pt─H and F─H bonds, which accelerate the adsorption and dissociation process of H2O and promote the HER reaction with a long‐term durability in neutral conditions. The interfacial accumulated fluoride ions and the anchored Pt single atoms/nanoparticles improve hydrogen evolution reaction activity and stability of NiFe‐based hydroxide catalysts in neutral conditions.
ISSN:1613-6810
1613-6829
1613-6829
DOI:10.1002/smll.202310642