TY - JOUR
T1 - Remarkable Effects of Lanthanide Substitution for the Y-Site on the Oxygen Storage/Release Performance of YMnO3+δ
AU - Otomo, Mayu
AU - Hasegawa, Takuya
AU - Asakura, Yusuke
AU - Yin, Shu
N1 - Funding Information:
This work was partly supported by the Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Energy systems toward a decarbonized society” (funding agency: JST) by the Japan Society for the Promotion of Science KAKENHI (grant nos: 20H00297 and JP16H06439), and the Dynamic Alliance for Open In-novation Bridging Human, Environment and Materials in Net-work Joint Research Center for Materials and Devices. The authors are thankful to the Photon Factory at the High-Energy Accelerator Research Organization (KEK) for XAFS measurements (proposal number: 2020P001).
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/7/14
Y1 - 2021/7/14
N2 - Lanthanide-substituted YMnO3+δ nanoparticles with the hexagonal phase, denoted as R0.25Y0.75MnO3+δ (R = Er, Dy, Tb, Gd, and Sm), have been successfully synthesized by the polymerized complex method. The substitutions did not largely affect the morphologies and specific surface area of the obtained R0.25Y0.75MnO3+δ nanoparticles. From the evaluation for the oxygen storage/release properties, the oxygen storage capacity (OSC) increased significantly by the Tb substitution, and the oxygen absorption/release rate strongly depended on the ion size of the substituted lanthanides. It was found that Tb4+ existed in Tb0.25Y0.75MnO3+δ after oxygen absorption, demonstrating that the remarkable increase in the OSC of the Tb-substituted sample was due to the oxidation of not only Mn3+ to Mn4+ but also Tb3+ to Tb4+. In addition, the unit cell volume increasing with the R ion size, which can lead to the promotion of the oxygen diffusion in the crystal structure, was the factor leading to the increase of the oxygen absorption rate. Especially, Sm0.25Y0.75MnO3+δ showed an excellent OSC of 3 + δ= 3.34 (the weight increase rate was 2.64 wt %) even under a rapid temperature swing rate of 20 °C/min.
AB - Lanthanide-substituted YMnO3+δ nanoparticles with the hexagonal phase, denoted as R0.25Y0.75MnO3+δ (R = Er, Dy, Tb, Gd, and Sm), have been successfully synthesized by the polymerized complex method. The substitutions did not largely affect the morphologies and specific surface area of the obtained R0.25Y0.75MnO3+δ nanoparticles. From the evaluation for the oxygen storage/release properties, the oxygen storage capacity (OSC) increased significantly by the Tb substitution, and the oxygen absorption/release rate strongly depended on the ion size of the substituted lanthanides. It was found that Tb4+ existed in Tb0.25Y0.75MnO3+δ after oxygen absorption, demonstrating that the remarkable increase in the OSC of the Tb-substituted sample was due to the oxidation of not only Mn3+ to Mn4+ but also Tb3+ to Tb4+. In addition, the unit cell volume increasing with the R ion size, which can lead to the promotion of the oxygen diffusion in the crystal structure, was the factor leading to the increase of the oxygen absorption rate. Especially, Sm0.25Y0.75MnO3+δ showed an excellent OSC of 3 + δ= 3.34 (the weight increase rate was 2.64 wt %) even under a rapid temperature swing rate of 20 °C/min.
KW - Oxygen storage
KW - XAFS analysis
KW - air separation
KW - hexagonal YMnO
KW - oxy-fuel combustion
KW - oxygen production
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U2 - 10.1021/acsami.1c06880
DO - 10.1021/acsami.1c06880
M3 - Article
C2 - 34185497
AN - SCOPUS:85110971189
SN - 1944-8244
VL - 13
SP - 31691
EP - 31698
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 27
ER -