Journal Article

PUBDB-2025-01352

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Boron-Incorporated Cobalt–Nickel Oxide Nanosheets for Electrochemical Oxygen Evolution Reaction

Wang, Y. ; Kumar, A.Extern* ; Budiyanto, E. ; Cheraparambil, H.Extern* ; Weidenthaler, C.Extern* ; Tueysuez, H. (Corresponding author)Extern*

2024
ACS Publications Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsaem.3c03136  doi:10.3204/PUBDB-2025-01352

Abstract: The composition and crystal structure are crucial parameters for the activity and stability of the electrocatalysts. Herein, we synthesize a series of Co$_x$Ni–B oxide nanosheets with low degree of crystallinity for alkaline media oxygen evolution reaction (OER). The sample with an optimized ratio Co$_8$Ni–B oxide shows the best OER performance, achieving a current density of 10 mA/cm$^2$ at an overpotential of 312 mV and a Tafel slope of 47 mV/dec in the 1 M KOH electrolyte. This sample is stable in the purified Fe-free KOH electrolyte and strongly activated in the nonpurified commercial electrolyte due to the Fe impurity uptake. The high surface area and partially crystalline structure caused by boron incorporation and low-temperature treatment provide more accessible active sites with retaining good stability against leaching during the OER. In situ electrochemical Raman spectroscopy investigation reveals the formation of OER active Co and Ni oxyhydroxides in Co$_8$Ni–B oxides under a potential bias. The Ni substitution in Co oxides modulates the electronic structure of Co, and the OER activity of the electrocatalyst can be enhanced by Fe uptake from the KOH electrolyte.

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Contributing Institute(s):

1. FS DOOR-User (FS DOOR-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. DFG project G:(GEPRIS)388390466 - TRR 247: Heterogene Oxidationskatalyse in der Flüssigphase – Materialien und Mechanismen in der thermischen, Elektro- und Photokatalyse (388390466) (388390466)
3. FS-Proposal: I-20211282 (I-20211282) (I-20211282)
4. FS-Proposal: I-20220115 (I-20220115) (I-20220115)

Experiment(s):

1. PETRA Beamline P02.1 (PETRA III)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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