用于中温运行固体氧化物燃料电池的SmBaCaCoO层状钙钛矿阴极

SmBaCaCoO Layered Perovskite Cathodes for Intermediate Temperature-operating Solid Oxide Fuel Cells.

作者信息

Song Kyeong Eun, Woo Sung Hun, Baek Seung Wook, Kang Hyunil, Choi Won Seok, Park Jun Young, Kim Jung Hyun

机构信息

Department of Advanced Materials Science and Engineering, Hanbat National University, Daejeon, South Korea.

Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science (KRISS), Daejeon, South Korea.

出版信息

Front Chem. 2021 Jan 25;8:628813. doi: 10.3389/fchem.2020.628813. eCollection 2020.

DOI:10.3389/fchem.2020.628813

PMID:33732683

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7958919/

Abstract

In SmBaCaCoO (x = 0.01, 0.03, 0.1, and 0.2, SBCCO) oxide systems calcined at 1100°C for 8 h, the XRD patterns of the SBCCO single phase were maintained in the cases of SmBaCaCoO (SBCCO-0.97) and SmBaCaCoO (SBCCO-0.99) compositions. In SmBaCaCoO (SBCCO-0.8) and SmBaCaCoO (SBCCO-0.9), CaCoSmO existed with the pattern SBCCO. SBCCO structures were identified as orthorhombic crystal structures because they showed splitting of the X-ray diffraction (XRD) peaks at 23.4°, 47.9°, and 59.1°.Typical metallic conduction behaviors were found in all measured compositions except SBCCO-0.8, which showed a metal-insulator transition (MIT) behavior. Compared to other SmBaCaCoO compositions, SBCCO-0.8 showed the highest electrical conductivity of 460 S/cm at 500°C. In particular, SBCCO-0.9 was found to have an excellent ASR characteristic of about 0.077 Ωcm at 700°C. The activation energy of SBCCO-0.9 was the lowest among SBCCO oxide systems with a value of 0.77 eV.

摘要

在1100°C下煅烧8小时的SmBaCaCoO（x = 0.01、0.03、0.1和0.2，SBCCO）氧化物体系中，SmBaCaCoO（SBCCO - 0.97）和SmBaCaCoO（SBCCO - 0.99）组成的情况下保持了SBCCO单相的X射线衍射（XRD）图谱。在SmBaCaCoO（SBCCO - 0.8）和SmBaCaCoO（SBCCO - 0.9）中，CaCoSmO与SBCCO图谱共存。SBCCO结构被确定为正交晶体结构，因为它们在23.4°、47.9°和59.1°处显示出X射线衍射（XRD）峰的分裂。除了表现出金属 - 绝缘体转变（MIT）行为的SBCCO - 0.8外，在所有测量的组成中都发现了典型的金属导电行为。与其他SmBaCaCoO组成相比，SBCCO - 0.8在500°C时显示出最高的电导率460 S/cm。特别是，发现SBCCO - 0.9在700°C时具有约0.077Ωcm的优异面积比电阻（ASR）特性。SBCCO - 0.9的活化能在SBCCO氧化物体系中是最低的，值为0.77 eV。