Operando Analysis of Losses in Commercial-Sized Solid Oxide Cells: Methodology Development and Validation

Antunes Staffolani, Arianna Baldinelli, Gianni Bidini, Francesco Nobili and Linda Barelli
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Antunes Staffolani: School of Science and Technologies, Chemistry Division, Via Madonna delle Carceri ChIP, Università di Camerino, I-62032 Camerino, Italy
Arianna Baldinelli: Department of Engineering, Università degli Studi di Perugia, Via Duranti 93, I-06125 Perugia, Italy
Gianni Bidini: Department of Engineering, Università degli Studi di Perugia, Via Duranti 93, I-06125 Perugia, Italy
Francesco Nobili: School of Science and Technologies, Chemistry Division, Via Madonna delle Carceri ChIP, Università di Camerino, I-62032 Camerino, Italy
Linda Barelli: Department of Engineering, Università degli Studi di Perugia, Via Duranti 93, I-06125 Perugia, Italy

Energies, 2022, vol. 15, issue 14, 1-17

Abstract: The development of decarbonised systems is being fostered by the increasing demand for technological solutions for the energy transition. Solid Oxide Cells are high-efficiency energy conversion systems that are foreseen for commercial development. They exhibit potential power generation and power-to-gas applications, including a reversible operation mode. Long-lasting high performance is essential for guaranteeing the success of the technology; therefore, it is fundamental to provide diagnosis tools at this early stage of development. In this context, operando analysis techniques help detect and identify incipient degradation phenomena to either counteract damage at its origin or correct operando protocols. Frequent switches from the fuel cell to the electrolyser mode add more challenges with respect to durable performance, and deep knowledge of reverse-operation-induced damage is lacking in the scientific and technical literature. Following on from preliminary experience with button cells, in this paper, the authors aim to transfer the methodology to commercial-sized Solid Oxide Cells. On the basis of the experimental evidence collected on planar square cells under dry and wet reactant feed gases, the main contributions to impedance are identified as being charge transfer (f = 10 3 –10 4 Hz), oxygen surface exchanged and diffusion in bulk LSCF (f = 10 2 –10 3 Hz), and gas diffusion in the fuel electrode (two peaks, f = 1–100 Hz). The results are validated using the ECM methodology, implementing an LRel(RctQ)GWFLW circuit.

Keywords: solid oxide fuel cells; ElS; DRT; equivalent circuit model; operando (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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