Energy & Environmental Materials >

2024 , Vol. 7 >Issue 3: 12606

DOI: https://doi.org/10.1002/eem2.12606

Highly Active Interfacial Sites in SFT-SnO2 Heterojunction Electrolyte for Enhanced Fuel Cell Performance via Engineered Energy Bands: Envisioned Theoretically and Experimentally

  • Sajid Rauf 1 ,
  • Muhammad Bilal Hanif 2 ,
  • Faiz Wali 3 ,
  • Zuhra Tayyab 1 ,
  • Bin Zhu , 4 ,
  • Naveed Mushtaq 4 ,
  • Yatao Yang , 1 ,
  • Kashif Khan 5 ,
  • Peter D. Lund 4,6 ,
  • Martin Motola 2 ,
  • Wei Xu , 1
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  • 1. College of Electronic and Information Engineering and State Key Laboratory of Radio frequency Heterogeneous Integration, Shenzhen University, Shenzhen 518000, China
  • 2. Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovicova 6, 842 15, Bratislava, Slovakia
  • 3. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
  • 4. School of Energy and Environment, Southeast University, No.2 Si Pai Lou, Nanjing 210096, China
  • 5. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China
  • 6. New Energy Technologies Group, Department of Applied Physics, Aalto University School of Science, P. O. Box 15100, FI-00076, Aalto, Espoo Finland
zhu-bin@seu.edu.cn
yatao86@163.com
weixu@szu.edu.cn

Received date: 31 Dec 2022

Revised date: 06 Feb 2023

Copyright

2023 2023 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.
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Abstract

Extending the ionic conductivity is the pre-requisite of electrolytes in fuel cell technology for high-electrochemical performance. In this regard, the introduction of semiconductor-oxide materials and the approach of heterostructure formation by modulating energy bands to enhance ionic conduction acting as an electrolyte in fuel cell-device. Semiconductor (n-type; SnO2) plays a key role by introducing into p-type SrFe0.2Ti0.8O3-δ (SFT) semiconductor perovskite materials to construct p-n heterojunction for high ionic conductivity. Therefore, two different composites of SFT and SnO2 are constructed by gluing p- and n-type SFT-SnO2, where the optimal composition of SFT-SnO2 (6:4) heterostructure electrolyte-based fuel cell achieved excellent ionic conductivity 0.24 S cm−1 with power-output of 1004 mW cm−2 and high OCV 1.12 V at a low operational temperature of 500 ℃. The high power-output and significant ionic conductivity with durable operation of 54 h are accredited to SFT-SnO2 heterojunction formation including interfacial conduction assisted by a built-in electric field in fuel cell device. Moreover, the fuel conversion efficiency and considerable Faradaic efficiency reveal the compatibility of SFT-SnO2 heterostructure electrolyte and ruled-out short-circuiting issue. Further, the first principle calculation provides sufficient information on structure optimization and energy-band structure modulation of SFT-SnO2. This strategy will provide new insight into semiconductor-based fuel cell technology to design novel electrolytes.

Key words： high ionic conductivity; interfacial conduction; modulated energy band structure; p-n heterojunction; semiconductors

Cite this article

Sajid Rauf , Muhammad Bilal Hanif , Faiz Wali , Zuhra Tayyab , Bin Zhu , Naveed Mushtaq , Yatao Yang , Kashif Khan , Peter D. Lund , Martin Motola , Wei Xu . Highly Active Interfacial Sites in SFT-SnO2 Heterojunction Electrolyte for Enhanced Fuel Cell Performance via Engineered Energy Bands: Envisioned Theoretically and Experimentally[J]. Energy & Environmental Materials, 2024 , 7(3) : 12606 . DOI: 10.1002/eem2.12606

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