Issue 43, 2022

Electronic structure manipulation via composition tuning for the development of highly conductive and acid-stable oxides

Abstract

Exploring materials that simultaneously possess high conductivity and electrochemical stability is critical for various energy-conversion applications. In this study, our combined computations and experiments suggest the Mg–Ti–O chemical space for novel ternary oxide compounds offering high electrical conductivity and corrosion stability in acidic conditions to be potentially used as catalyst supporter of polymer electrolyte membrane fuel cells. High electrical conductivity (6.09 × 10−1 S cm−1) is achieved at room temperature by tuning the chemical composition of Mg1−xTi2+xO5 while still maintaining good corrosion stability (1.2 × 10−4 mA cm−2 after six days) in acidic conditions. Furthermore, we discover that a reducing gas environment during the synthesis increases the Ti solubility in Mg1−xTi2+xO5 with a reduced valence state of Ti, thus resulting in high conductivity.

Graphical abstract: Electronic structure manipulation via composition tuning for the development of highly conductive and acid-stable oxides

Supplementary files

Article information

Article type
Paper
Submitted
21 may 2022
Accepted
10 okt 2022
First published
11 okt 2022

J. Mater. Chem. A, 2022,10, 23155-23164

Author version available

Electronic structure manipulation via composition tuning for the development of highly conductive and acid-stable oxides

Y. Byeon, J. Mailoa, M. Kornbluth, G. Lee, Z. Cai, Y. Sun, W. Yang, C. Johnston, J. Christensen, S. Kim, L. Cheng and H. Kim, J. Mater. Chem. A, 2022, 10, 23155 DOI: 10.1039/D2TA04084K

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