Investigating the Dynamic Role of Iron in Activating Nickel-Iron-Layered Double Hydroxide During the Oxygen Evolution Reaction: An Operando

DOI

Nickel-iron layered double hydroxides (NiFe-LDHs) are highly effective oxygen evolution reaction (OER) electrocatalysts, undergoing dynamic transformations into active oxyhydroxides under electrochemical conditions. However, the structural and electronic changes during this process remain unclear, requiring real-time monitoring on short timescales (milliseconds to seconds). A key aspect of this transformation is the interplay between Fe oxidation and deprotonation, where Fe⁴⁺ may induce Ni-OH deprotonation or Ni oxidation may first weaken the OH network, triggering deprotonation and Fe activation (Fe3⁺→Fe4+). To resolve these ambiguities, we propose to operando study NiFe-LDHs using synchrotron Mössbauer spectroscopy (SMS) at ESRF’s ID14. Additionally, we aim to investigate Fe’s role in the α-to-γ phase transition, crucial for optimizing catalytic performance. Understanding Fe’s role in structural evolution is significant to NiFe catalyst stability and efficiency.

Identifier
DOI https://doi.org/10.15151/ESRF-ES-2220629213
Metadata Access https://icatplus.esrf.fr/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatplus.esrf.fr:inv/2220629213
Provenance
Creator XIANG LI ORCID logo; Sumbal FARID; Nawfel EL MAZOUNI; Michel, Moulay Tahar SOUGRATI ORCID logo; Changchang DONG; Junhu WANG; Wei SUN
Publisher ESRF (European Synchrotron Radiation Facility)
Publication Year 2028
Rights CC-BY-4.0; https://creativecommons.org/licenses/by/4.0
OpenAccess true
Representation
Resource Type Data from large facility measurement; Collection
Discipline Particles, Nuclei and Fields