Structural Changes of NiFe Layered Double Hydroxides During the Oxygen Evolution Reaction: A Diffraction and Total Scattering Operando Study

被引：0

作者：

Aalling-Frederiksen, Olivia ^{[1
,2
]}

Schlegel, Nicolas ^{[1
,2
,3
]}

Punke, Stefanie ^{[1
,2
]}

Anker, Andy S. ^{[1
,2
]}

Wiberg, Gustav K. H. ^{[3
]}

Wang, Baiyu ^{[1
,2
]}

Edelvang-Pejrup, Jens ^{[1
,2
]}

Holde, Freja B. ^{[1
,2
]}

Salinas-Quezada, Maria Paula ^{[1
,2
]}

Magnard, Nicolas P. L. ^{[1
,2
]}

Graversen, Laura G. ^{[1
,2
]}

Arenz, Matthias ^{[3
]}

Pittkowski, Rebecca K. ^{[1
,2
]}

Jensen, Kirsten M. O. ^{[1
,2
]}

机构：

[1] Univ Copenhagen, Dept Chem, Copenhagen, Denmark

[2] Univ Copenhagen, Nanosci Ctr, Copenhagen, Denmark

[3] Univ Bern, Dept Chem Biochem & Pharmaceut Sci, Bern, Switzerland

来源：

SMALL | 2025年 / 21卷 / 12期

基金：

新加坡国家研究基金会; 瑞典研究理事会;

关键词：

layered compounds; nanostructures; operando experiments; oxygen evolution reaction; pair distribution function analysis; TRANSITION-METAL (OXY)HYDROXIDES; WATER OXIDATION; FE SITES; ELECTROCATALYSTS; AMORPHIZATION; EXFOLIATION; IMPURITIES; CATALYSTS; STATE; FILM;

D O I：

10.1002/smll.202411211

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

NiFe-layered double hydroxides (LDHs) are promising electrocatalysts for the oxygen evolution reaction (OER) in alkaline media. Here, operando X-ray diffraction (XRD) and X-ray total scattering are used with Pair Distribution Function (PDF) analysis to investigate the atomic structure of the catalytically active material and follow structural changes under operating conditions. XRD shows an interlayer contraction under applied oxidative potential, which relates to a transition from the alpha-LDH to the gamma-LDH phase. The phase transition is reversible, and the alpha-LDH structure is recovered at 1.3 VRHE. However, PDF analysis shows an irreversible increase in the stacking disorder under operating conditions, along with a decrease in the LDH sheet size. The analysis thus shows that the operating conditions induce a breakdown of the particles leading to a decrease in crystallite size.

引用

页数：10

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