Journal Article

FZJ-2024-06982

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Exploring the Effect of Ball Milling on the Physicochemical Properties and Oxygen Evolution Reaction Activity of Nickel and Cobalt Oxides

Bhandari, S. (First author)RWTH* ; Schierholz, R. (Collaboration author)FZJ* ; Eichel, R.-A.FZJ*RWTH* ; Luna, A. L. (Corresponding author)FZJ* ; Mechler, A. K. (Corresponding author)FZJ*RWTH*

2024
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/aesr.202400183  doi:10.34734/FZJ-2024-06982

Abstract: Ball milling is commonly used to reduce catalyst particle size. However, littleattention is paid to further changes that ball milling can cause to the rest of thecatalysts’ physicochemical properties, which can impact their intrinsic catalyticactivity. The effect of ball milling on the physicochemical properties of NiCoO2 ,NiO, CoO, and NiO:CoO mixtures is reported and correlated with their elec-trochemical oxygen evolution reaction (OER) activity. It is also shown thatparticle fragmentation is an inherent consequence of ball milling, but someoxides can also experience a phase transformation. In the case of rocksalt-structured CoO, it is partially or entirely transformed to spinel-structuredCo 3O 4 . Additionally, NiCo 2O 4 with a spinel structure can be formed by ballmilling NiO and CoO simultaneously (both rocksalt structures), but only in theabsence of water. The changes impact the electrochemical activity of the initialoxides. Ball milled NiCoO 2 exhibits the highest activity with a mean potentialof 1.563 V at 10 mA cm2 , demonstrating the advantage of having Ni and Co inthe same structure. Although NiCo2O4 is also a binary oxide, the results indicatethat its metal coordination environment makes it intrinsically less active thanNiCoO2 for the OER in alkaline media..

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IET-1)

Research Program(s):

1. 1231 - Electrochemistry for Hydrogen (POF4-123) (POF4-123)

Appears in the scientific report 2024

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Database coverage:
; ; ; Article Processing Charges ; Clarivate Analytics Master Journal List ; DOAJ Seal ; Emerging Sources Citation Index ; Fees ; IF >= 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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