Low‐Temperature Protonic Ceramic Fuel Cells through Interfacial Engineering of Nanocrystalline BaCe0.7Zr0.1Y0.1Yb0.1O3−δ Electrolytes. Issue 11 (11th July 2021)

• Record Type: Journal Article
• Authors: Gao, Jun; Meng, Yuqing; Duffy, Jack H.; Brinkman, Kyle S.
• Is Part Of: Advanced energy & sustainability research. Volume 2:Issue 11(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-07-11
• Subjects: hydrogen isotope exchange -- in situ Raman -- nanocrystalline membranes -- proton transport -- protonic ceramic fuel cells; Renewable energy sources -- Periodicals; Environmental sciences -- Periodicals; Sustainable development -- Periodicals; 621.042
• DOI: 10.1002/aesr.202100098
• Languages: English
• ISSNs: 2699-9412

Abstract

Abstract : Nanocrystalline BaCe0.7 Zr0.1 Y0.1 Yb0.1 O3− δ (BCZYYb) is designed by a novel strategy with improved proton transport properties at low temperatures (<300 °C). In situ Raman spectroscopy and electrical conductivity relaxation (ECR) are used to quantitatively evaluate the surface exchange coefficients during the hydrogen isotope exchange process. Similar surface exchange coefficients are measured via in situ Raman spectroscopy and ECR measurements, representing new tools to better understand proton transport behaviors at the materials' interface. The surface exchange coefficient in nanocrystalline BCZYYb is nearly four times higher than that in conventional dense BCZYYb at 300 °C, indicating higher surface mobility of protonic species in the designed BCZYYb membrane. The improved performance originates from the combined interfacial and bulk effects for proton transport at low temperatures. In addition, low‐temperature protonic ceramic fuel cells (PCFCs) are built based on a nanocrystalline BCZYYb electrolyte with improved single‐cell performance at 300 °C, which indicates enhanced proton transport properties in contemporary energy conversion and storage materials can be achieved through interfacial engineering. Abstract : Enhanced proton transport properties are achieved in a designed nanoscale perovskite membrane system with a combined "interfacial effect" from hydrated layers and "bulk effect" from oxygen vacancies at low temperatures (<300 °C). This finding suggests a promising strategy to design a new generation of low‐temperature protonic ceramic conductors.