Enhanced low-temperature proton conductivity in hydrogen-intercalated brownmillerite oxide

Nianpeng Lu, Zhuo Zhang, Yujia Wang, Hao-Bo Li, Shuang Qiao, Bo Zhao, Qing He, Sicheng Lu, Cong Li, Yongshun Wu, Mingtong Zhu, Xiangyu Lyu, Xiaokun Chen, Zhuolu Li, Meng Wang, Jingzhao Zhang, Sze Chun Tsang, Jingwen Guo, Shuzhen Yang, Jianbing Zhang, Ke Deng, Ding Zhang, Jing Ma, Jun Ren, Yang Wu, Junyi Zhu, Shuyun Zhou, Yoshinori Tokura, Ce-Wen Nan, Jian Wu () and Pu Yu ()
Additional contact information
Nianpeng Lu: Tsinghua University
Zhuo Zhang: Tsinghua University
Yujia Wang: Tsinghua University
Hao-Bo Li: Tsinghua University
Shuang Qiao: Tsinghua University
Bo Zhao: Tsinghua University
Qing He: Durham University
Sicheng Lu: Tsinghua University
Cong Li: Tsinghua University
Yongshun Wu: Tsinghua University
Mingtong Zhu: Chinese Academy of Science
Xiangyu Lyu: Chinese Academy of Science
Xiaokun Chen: Chinese Academy of Science
Zhuolu Li: Tsinghua University
Meng Wang: Tsinghua University
Jingzhao Zhang: The Chinese University of Hong Kong
Sze Chun Tsang: The Chinese University of Hong Kong
Jingwen Guo: Tsinghua University
Shuzhen Yang: Tsinghua University
Jianbing Zhang: Tsinghua University
Ke Deng: Tsinghua University
Ding Zhang: Tsinghua University
Jing Ma: Tsinghua University
Jun Ren: Tsinghua University
Yang Wu: Tsinghua University
Junyi Zhu: The Chinese University of Hong Kong
Shuyun Zhou: Tsinghua University
Yoshinori Tokura: RIKEN Center for Emergent Matter Science (CEMS)
Ce-Wen Nan: Tsinghua University
Jian Wu: Tsinghua University
Pu Yu: Tsinghua University

Nature Energy, 2022, vol. 7, issue 12, 1208-1216

Abstract: Abstract Solid oxide ionic conductors are employed in a wide range of energy-conversion applications, such as electrolytes in fuel cells. Typically, conventional ionic conductors based on metal oxides require elevated temperatures above approximately 500 °C to activate ionic transport, but the ability to operate at lower temperature could avoid mechanical instability and operating complexities. Here we report a solid oxide proton conductor, HSrCoO2.5, which shows unusually high proton conductivity between 40 °C and 140 °C. The proton conductivity was between 0.028 S cm−1 to 0.33 S cm−1 in this temperature range, with an ionic activation energy of approximately 0.27 eV. Combining experimental results and first-principles calculations, we attribute these intriguing properties to the high proton concentration and the well-ordered oxygen vacancy channels granted by the hydrogen-intercalated brownmillerite crystalline structure. Our results open the possibility of using solid oxide materials as the proton-conducting electrolytes in low-temperature devices.

Date: 2022
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DOI: 10.1038/s41560-022-01166-8

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