Publication date: 10th April 2024
In the development of nano-scaled oxygen electrodes of the high temperature solid oxide cells (SOCs), the interface formed between the nanoelectrode particles and the electrolyte or electrolyte scaffolds is most critical for the high activity and high durability of SOCs. In this work, a new synthesis technique for the fabrication of nano-structured electrodes via the in situ electrochemical polarisation treatment is reported. To demonstrate the feasibility of the technique, lanthanum strontium cobalt ferrite (LSCF) nitrate precursor solution is infiltrated into gadolinia-doped ceria (GDC) scaffold pre-sintered on yttria-stabilized zirconia (YSZ) electrolyte, followed by in situ polarisation current treatment at operation temperatures in the range from 700 to 800℃. Results clearly show that both electrode ohmic resistance and polarisation resistance decrease with the increase of polarisation current treatment. Detailed microstructure analysis indicates the formation of convex-shaped interface between LSCF nanoparticles and GDC scaffold, very different from flat contact between LSCF and GDC observed after heated at 800oC with no polarization current treatment. Coherent lattice arrangement at the interface between LSCF and GDC are clearly revealed at the atomic level, contributing to the superior structure stability against long term cell operation. This is demonstrated by the excellent stability under both fuel cell and electrolysis operation conditions at 750oC. Moreover, good performance of in situ polarization induced nano-structured LSCF/GDC composite electrodes is demonstrated on single cells, achieving a high peak power density of 1.58 Wcm-2 at 750℃. This work highlights a novel and facile route to in-situ construct stable and high-performing nanostructured electrode for SOCs.
The project was supported by the Collaborative Doctoral Programme of Curtin-Aberdeen Alliance, Guangdong Basic and Applied Basic Research Foundation (2022A1515110491), and Foshan Xianhu Laboratory Young Fellowship Program (XHQN2022-004).
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