First-Row Transition Metal Antimonates for the Oxygen Reduction Reaction
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 6334-6348 |
Journal / Publication | ACS Nano |
Volume | 16 |
Issue number | 4 |
Online published | 4 Apr 2022 |
Publication status | Published - 26 Apr 2022 |
Externally published | Yes |
Link(s)
Abstract
The development of inexpensive and abundant catalysts with high activity, selectivity, and stability for the oxygen reduction reaction (ORR) is imperative for the widespread implementation of fuel cell devices. Herein, we present a combined theoretical-experimental approach to discover and design first-row transition metal antimonates as excellent electrocatalytic materials for the ORR. Theoretically, we identify first-row transition metal antimonates─MSb2O6, where M = Mn, Fe, Co, and Ni─as nonprecious metal catalysts with good oxygen binding energetics, conductivity, thermodynamic phase stability, and aqueous stability. Among the considered antimonates, MnSb2O6 shows the highest theoretical ORR activity based on the 4e- ORR kinetic volcano. Experimentally, nanoparticulate transition metal antimonate catalysts are found to have a minimum of a 2.5-fold enhancement in intrinsic mass activity (on transition metal mass basis) relative to the corresponding transition metal oxide at 0.7 V vs RHE in 0.1 M KOH. MnSb2O6 is the most active catalyst under these conditions, with a 3.5-fold enhancement on a per Mn mass activity basis and 25-fold enhancement on a surface area basis over its antimony-free counterpart. Electrocatalytic and material stability are demonstrated over a 5 h chronopotentiometry experiment in the stability window identified by theoretical Pourbaix analysis. This study further highlights the stable and electrically conductive antimonate structure as a framework to tune the activity and selectivity of nonprecious metal oxide active sites for ORR catalysis. © 2022 American Chemical Society.
Research Area(s)
- catalyst design, electrocatalysis, fuel cells, nonprecious metal catalysts, oxygen reduction reaction, Pourbaix diagram, transition metal antimonates
Citation Format(s)
First-Row Transition Metal Antimonates for the Oxygen Reduction Reaction. / Gunasooriya, G. T. Kasun Kalhara; Kreider, Melissa E.; Liu, Yunzhi et al.
In: ACS Nano, Vol. 16, No. 4, 26.04.2022, p. 6334-6348.
In: ACS Nano, Vol. 16, No. 4, 26.04.2022, p. 6334-6348.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review