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Built-in electric field-assisted heterostructure electrolyte based on K2NiF4-type La2NiO4 for solid oxide fuel cells

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Abstract

The reduction of the operating temperatures of solid oxide fuel cells (SOFCs) has attracted global research attention and inspired considerable efforts toward the development of new materials for low-temperature (LT) operation, such as K2NiF4-type electrode La2NiO4 (LNO). In this study, to explore the ion-conducting capability of LNO as an SOFC electrolyte while simultaneously maintaining good catalytic activity, a p–n heterostructure composite was constructed by incorporating p-type LNO with n-type ZnO. The as-prepared LNO–ZnO exhibited a bulk heterostructure with a favorable biphasic distribution and a number of heterointerface contacts. When the as-prepared LNO–ZnO was applied as the electrolyte layer in the SOFC, it exhibited a maximum fuel cell power density of 707 mW cm−2 with an open-circuit voltage of 1.04 V at 550 °C, as well as considerable stability. According to further measurements, the energy band structures of the two semiconductors and the rectifying characteristics of the LNO–ZnO heterostructure were investigated. The results revealed that the electrolyte functionality of LNO–ZnO is realized predominantly by the built-in electric field of the p–n heterojunction to transport ions while simultaneously blocking electrons. Our results thus demonstrated that K2NiF4-type LNO can serve not only as an electrode but also as an electrolyte and suggested that the built-in electric field-assisted heterostructure is a feasible approach for developing LT-SOFC materials.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by the Scientific and Technological Innovation Team of Nanjing (Grant No. NINGJIAOGAOSHI2021No.16).

Funding

This study was supported by the Scientific and Technological Innovation Team of Nanjing (NINGJIAOGAOSHI2021No.16).

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Authors and Affiliations

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, People’s Republic of China

    Yuzheng Lu & Chunhua Lu

  2. School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing, 211171, People’s Republic of China

    Yuzheng Lu & Senlin Yan

  3. Key Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, China

    Muhanmmud Yousaf & Chen Xia

Authors
  1. Yuzheng Lu
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  2. Muhanmmud Yousaf
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  4. Senlin Yan
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  5. Chunhua Lu
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by [YL], [CX], [SY], and [CL]. The first draft of the manuscript was written by [YL] and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yuzheng Lu or Chunhua Lu.

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Lu, Y., Yousaf, M., Xia, C. et al. Built-in electric field-assisted heterostructure electrolyte based on K2NiF4-type La2NiO4 for solid oxide fuel cells. J Mater Sci: Mater Electron 34, 1440 (2023). https://doi.org/10.1007/s10854-023-10812-0

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