Julia Linke¹, Thomas Rohrbach¹, Adam Hugh Clark^2*, Michal Andrzejewski², Nicola Pietro Maria Casati², Fabian Luca Buchauer³, Mikkel Rykær Kraglund³, Christodoulos Chatzichristodoulou³, Eibhlin Meade¹, Marco Ranocchiari¹, Thomas Justus Schmidt^1,4, Emiliana Fabbri^1*

1 Paul Scherrer Institute (PSI) Center for Energy and Environmental Sciences, Villigen, Aargau, Switzerland

2 Paul Scherrer Institute (PSI) Center for Photon Science, Villigen, Aargau, Switzerland

3 Department of Energy Conversion and Storage, Technical University of Denmark, Kongens Lyngby, Denmark

4 Eidgenössische Technische Hochschule Zürich (ETHZ), Institute of Molecular Physical Science, Zürich, Switzerland

* Corresponding authors emails: adam.clark@psi.ch, emiliana.fabbri@psi.ch

DOI10.24435/materialscloud:m1-4v [version v1]

Publication date: Mar 12, 2025

How to cite this record

Julia Linke, Thomas Rohrbach, Adam Hugh Clark, Michal Andrzejewski, Nicola Pietro Maria Casati, Fabian Luca Buchauer, Mikkel Rykær Kraglund, Christodoulos Chatzichristodoulou, Eibhlin Meade, Marco Ranocchiari, Thomas Justus Schmidt, Emiliana Fabbri, From operando investigations to implementation of Ni-MOF-74 oxygen evolution electrocatalysts, Materials Cloud Archive 2025.38 (2025), https://doi.org/10.24435/materialscloud:m1-4v

Description

Metal-organic frameworks (MOFs) as electrocatalysts for the alkaline oxygen evolution reaction (OER) show promising catalytic activity by offering great variability and high surface areas, enabling performance optimization and mechanistic studies. However, their stability during reaction and the structure-performance relationship defining the origin of the high OER activity, are still vigorously debated. Herein, we leverage operando X-ray absorption spectroscopy and operando X-ray diffraction to unveil the structural and electronic transformations of Ni-MOF-74 during OER. We identify the irreversible destruction of the MOF-74 crystal into a highly OER active, amorphous NiOOH-metal organic compound. Based on these findings, we propose an amorphous Ni metal organic compound (Ni-MOC*) for achieving high current densities both in a three-electrode cell (14 A gNi-1 at 1.5 VRHE) and in an anion exchange membrane water electrolyzer (AEM-WE) with a stable AEM-WE performance exceeding 100 h at 500 mA cm-2.

Materials Cloud sections using this data

Files

File name	Size	Description
Figure1.7z MD5md5:9812007336d70b344bc9156120a9750b	205.5 KiB	Raw Data for Figure 1
Figure2.7z MD5md5:968eaf73e8fe1c15705d0f1d0a1d900c	9.9 MiB	Raw Data for Figure 2
Figure3.7z MD5md5:bdf4771491dc715201b6f82b58760f20	4.3 MiB	Raw Data for Figure 3
Figure4.7z MD5md5:ad263d13950c1aa93e6127698fb51db4	69.1 KiB	Raw Data for Figure 4
Figure5.7z MD5md5:c960814a4ca7d03973e9df66951a7959	1017.7 KiB	Raw Data for Figure 5
Figure6.7z MD5md5:74ef704cc0f8392d57168780d778feda	3.9 MiB	Raw Data for Figure 6

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External references

Keywords

OER MARVEL electrocatalysis Ni-MOF-74 alkaline/AEM water electrolysis operando XAS/XRD