Highly Active Interfacial Sites in SFT-SnO2 Heterojunction Electrolyte for Enhanced Fuel Cell Performance via Engineered Energy Bands: Envisioned Theoretically and Experimentally
Received date: 31 Dec 2022
Revised date: 06 Feb 2023
Copyright
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.
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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