Title
Nanocast Mixed Ni–Co–Mn Oxides with Controlled Surface and Pore Structure for Electrochemical Oxygen Evolution Reaction
Author
Mingquan Yu
Department of Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung
... show all
Abstract
Nanocasting or hard-templating is a versatile method to produce ordered mesoporous mixed transition metal oxides (MTMOs) with promising potential for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Herein, a comprehensive investigation was conducted on various NixCoyMnzO4 replicated from large pore KIT-6 silica. The materials were calcined at different temperatures to study the influence of the oxide formation and the resulting pore structure ordering, as well as surface properties, on the electrochemical activity and stability of the catalysts. After a comprehensive characterization, electrocatalytic performances of the materials were investigated in detail for OER to find a structure–activity relationship. In OER, a correlation was established between calcination temperature, pore and surface properties, and the overall efficiency and stability. The best sample, NixCoyMnzO4 calcined at 300 °C, provided a reasonable current density (25 mA/cm2 at 1.7 V vs RHE) and an overpotential of 400 mV at 10 mA/cm2, and demonstrated increased current density (above 200 mA/cm2 at 1.7 V vs RHE) once loaded into a Ni foam compared to the bare foam. This sample also remained stable over 15 h. Our results indicate that the calcination temperature greatly affects the porosity, crystalline structure, phase composition, and the activity of the catalysts toward OER.
Keywords
electrocatalystsOERmesoporous materialsnanocastingnon-noble metalsmixed metal oxidesspinel
Object type
Language
English [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:2094433
Appeared in
Title
ACS Applied Energy Materials
Volume
3
Issue
6
ISSN
2574-0962
Issued
2020
From page
5597
To page
5609
Publisher
American Chemical Society (ACS)
Date issued
2020
Access rights
Rights statement
© 2020 American Chemical Society

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