High Throughput Synthesis and Screening of Oxygen Reduction Catalysts in the M TiO3 (M = Ca, Sr, Ba) Perovskite Phase Diagram

Alexandra R Groves; Thomas E Ashton; Jawwad A Darr

doi:10.1021/acscombsci.0c00094

High Throughput Synthesis and Screening of Oxygen Reduction Catalysts in the M TiO₃ (M = Ca, Sr, Ba) Perovskite Phase Diagram

ACS Comb Sci. 2020 Dec 14;22(12):750-756. doi: 10.1021/acscombsci.0c00094. Epub 2020 Nov 5.

Authors

Alexandra R Groves¹, Thomas E Ashton¹, Jawwad A Darr¹

Affiliation

¹ Department of Chemistry, University College London, 20 Gordon Street, Bloomsbury, London, WC1H 0AJ, U.K.

PMID: 33151687
DOI: 10.1021/acscombsci.0c00094

Abstract

A library of 66 perovskite Ba_xSr_yCa_zTiO₃ (x + y + z = 1) samples (ca. three grams per sample) was made in ca. 14 h using a high-throughput continuous hydrothermal flow synthesis system. The as-synthesized samples were collected from the outlet of the process and then cleaned and freeze-dried before being evaluated individually as oxygen reduction catalysts using a rotating disk electrode testing technique. To establish any correlations between physical and electrochemical characterization data, the as-synthesized samples were investigated using analytical methods including BET surface area, powder X-ray diffraction (PXRD) and in selected cases, transmission electron microscopy (TEM). The aforementioned approach was validated as being able to quickly identify oxygen reduction catalysts from new libraries of electrocatalysts.

Keywords: X-ray diffraction; combinatorial synthesis; continuous hydrothermal flow synthesis; electrocatalysis; green chemistry; oxygen reduction reaction.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Catalysis
High-Throughput Screening Assays*
Metals, Alkaline Earth / chemistry*
Oxidation-Reduction
Oxygen / chemistry*
Titanium / chemistry*

Substances

Metals, Alkaline Earth
Titanium
Oxygen