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<p>Symmetrical solid oxide fuel cells (S-SOFCs) are energy-efficient electrochemical power sources that open up new possibilities for clean energy. In this work, the physicochemical properties of fluorite-like Nd<sub>5</sub>Mo<sub>3</sub>O<sub>16+δ</sub> (NMO) have been investigated for the first time to evaluate its potential as an electrode material for S-SOFC. Electrical conductivity measurements under reducing conditions (Ar/H<sub>2</sub>) at 100–900&#xa0;°C have revealed thermally activated behavior with predominant electronic conductivity of 1.7 S/cm at 800&#xa0;°C. The thermal expansion coefficient of NMO in Ar/H<sub>2</sub> at 25–900&#xa0;°C has been determined to be 10.7&#xa0;ppm/K. No new phases formed when NMO was heated with conventional electrolyte materials up to 950&#xa0;°C with Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>1.95</sub> (GDC) and 850&#xa0;°C with Zr<sub>0.84</sub>Y<sub>0.16</sub>O<sub>1.92</sub> (YSZ). The polarization resistance (<i>R</i><sub>η</sub>) of the NMO electrode at 800&#xa0;°C has been recorded as 15.1 Ω·cm<sup>2</sup> in air and 5.6 Ω·cm<sup>2</sup> in an Ar/H<sub>2</sub> atmosphere. An electrolyte-supported S-SOFC with the NMO/GDC/YSZ/GDC/NMO configuration has achieved a power density of 14 mW/cm<sup>2</sup> at 900&#xa0;°C. Replacing the NMO cathode with (La<sub>0.75</sub>Sr<sub>0.25</sub>)<sub>0.95</sub>MnO<sub>3-δ</sub> has led to the increase of the power density to 100 mW/cm<sup>2</sup> at 900&#xa0;°C. Long-term stability tests carried out on both fuel cells under a constant voltage of 0.7&#xa0;V showed no significant degradation in performance. Thus, the obtained results demonstrated that NMO is a promising candidate for use as an anode material in SOFCs.</p>

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Evaluation of Nd5Mo3O16+δ as a potential electrode material for symmetrical SOFC

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • D. V. Kuznetsov,
  • N. V. Lyskov,
  • S. Ya. Istomin,
  • G. N. Mazo

摘要

Symmetrical solid oxide fuel cells (S-SOFCs) are energy-efficient electrochemical power sources that open up new possibilities for clean energy. In this work, the physicochemical properties of fluorite-like Nd5Mo3O16+δ (NMO) have been investigated for the first time to evaluate its potential as an electrode material for S-SOFC. Electrical conductivity measurements under reducing conditions (Ar/H2) at 100–900 °C have revealed thermally activated behavior with predominant electronic conductivity of 1.7 S/cm at 800 °C. The thermal expansion coefficient of NMO in Ar/H2 at 25–900 °C has been determined to be 10.7 ppm/K. No new phases formed when NMO was heated with conventional electrolyte materials up to 950 °C with Ce0.9Gd0.1O1.95 (GDC) and 850 °C with Zr0.84Y0.16O1.92 (YSZ). The polarization resistance (Rη) of the NMO electrode at 800 °C has been recorded as 15.1 Ω·cm2 in air and 5.6 Ω·cm2 in an Ar/H2 atmosphere. An electrolyte-supported S-SOFC with the NMO/GDC/YSZ/GDC/NMO configuration has achieved a power density of 14 mW/cm2 at 900 °C. Replacing the NMO cathode with (La0.75Sr0.25)0.95MnO3-δ has led to the increase of the power density to 100 mW/cm2 at 900 °C. Long-term stability tests carried out on both fuel cells under a constant voltage of 0.7 V showed no significant degradation in performance. Thus, the obtained results demonstrated that NMO is a promising candidate for use as an anode material in SOFCs.