Solid-State Gelation for Nanostructured Perovskite Oxide Aerogels
Name
Solid-State Gelation for Nanostructured Perovskite Oxide Aerogels.pdf
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931 KB
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Checksum (MD5)
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Author(s)
Cai, Bin
Akkiraju, Karthik
Mounfield, William
Wang, Zhenshu
Li, Xing
Huang, Botao
Yuan, Shuai
Sun, Dong Seok
Román- Leshkov, Yuriy
Shao-Horn, Yang
Date Issued
October 2019
Journal
Chemistry of Materials
Publisher
American Chemical Society (ACS)
Citation
Cai, Bin et al. "Solid-State Gelation for Nanostructured Perovskite Oxide Aerogels." Chemistry of Materials 31, 22 (October 2019): 9422–9429 © 2019 American Chemical Society
Version
Author's final manuscript
Abstract
Fabricating nanostructured perovskite oxide aerogel to access a dramatic increase in the specific surface area has proved challenging despite continued efforts. Here, we report a versatile and general method for synthesizing nanosized perovskite oxides. Specifically, we used bimetallic “LaMnOx” oxide nanoparticles as the precursors to synthesize r-LaMnO[subscript 3±δ] perovskite oxide aerogels by way of a solid-state gelation process, generating aerogels with specific surface areas exceeding 74.2 m[superscript 2] g oxide[superscript –1]. The r-LaMnO[subscript 3±δ] aerogel featured an increased Mn valence state compared to the bulk form of the material, facilitating the oxygen reduction reaction kinetics in alkaline medium. At 0.8 VRHE, the r-LaMnO[subscript 3±δ] aerogel achieved a mass activity of 66.2 A g oxide[superscript –1], which is 153-fold higher mass activity compared to the conventional bulk LaMnO3. The solid-state gelation synthesis route was extended to other perovskite oxides with high compositional diversity, including LaMnO[subscript 3], LaFeO[subscript 3], LaNiO[subscript 3], LaCoO[subscript 3], La[subscript 0.5]Sr[subscript 0.5]CoO[subscript 3], and La[subscript 0.5]Sr[subscript 0.5]Co[subscript 0.5]Fe[subscript 0.5]O[subscript 3], thereby demonstrating the versatile nature of our synthetic route for the fabrication of a wide range of nanostructured perovskite oxides.
MIT Department
Massachusetts Institute of Technology. Electrochemical Energy Laboratory
Massachusetts Institute of Technology. Research Laboratory of Electronics
Massachusetts Institute of Technology. Department of Chemical Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1021/acs.chemmater.9b03182
