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<p>Low-concentration coal mine methane (LC-CMM), which is predominantly composed of methane, serves as a clean and low-carbon energy resource with significant potential for utilization. Utilizing LC-CMM as fuel for solid oxide fuel cells (SOFCs) represents an efficient and promising strategy for its effective utilization. However, direct application in Ni-based anodes induces carbon deposition, which severely degrades cell performance. Herein, a medium-entropy oxide Sr<sub>2</sub>FeNi<sub>0.1</sub>Cr<sub>0.3</sub>Mn<sub>0.3</sub>Mo<sub>0.3</sub>O<sub>6−<i>δ</i></sub> (SFNCMM) was developed as an anode internal reforming catalyst. Following reduction treatment, FeNi<sub>3</sub> nano-alloy particles precipitate on the surface of the material, thereby significantly enhancing its catalytic activity for LC-CMM reforming process. The catalyst achieved a methane conversion rate of 53.3%, demonstrating excellent catalytic performance. Electrochemical evaluations revealed that SFNCMM-Gd<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−<i>δ</i></sub> (GDC) with a weight ratio of 7:3 exhibited superior electrochemical performance when employed as the anodic catalytic layer. With H<sub>2</sub> and LC-CMM as fuels, the single cell achieved maximum power densities of 1467.32 and 1116.97 mW·cm<sup>−2</sup> at 800°C, respectively, with corresponding polarization impedances of 0.17 and 1.35 Ω·cm<sup>2</sup>. Furthermore, the single cell maintained stable operation for over 100 h under LC-CMM fueling without significant carbon deposition, confirming its robust resistance to carbon formation. These results underscore the potential of medium-entropy oxides as highly effective catalytic layers for mitigating carbon deposition in SOFCs.</p>

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Application of Sr2FeMoO6−δ-based medium entropy oxide as an anode internal reforming catalyst in solid oxide fuel cells fueled by low-concentration coal mine methane

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Chuanqi Sun,
  • Jinke Zhang,
  • Xiuyang Qian,
  • Mingfei Li,
  • Hongming Liu,
  • Jiangbo Dong,
  • Jinda Li,
  • Wenlin Yang,
  • Mumin Rao,
  • Yihan Ling

摘要

Low-concentration coal mine methane (LC-CMM), which is predominantly composed of methane, serves as a clean and low-carbon energy resource with significant potential for utilization. Utilizing LC-CMM as fuel for solid oxide fuel cells (SOFCs) represents an efficient and promising strategy for its effective utilization. However, direct application in Ni-based anodes induces carbon deposition, which severely degrades cell performance. Herein, a medium-entropy oxide Sr2FeNi0.1Cr0.3Mn0.3Mo0.3O6−δ (SFNCMM) was developed as an anode internal reforming catalyst. Following reduction treatment, FeNi3 nano-alloy particles precipitate on the surface of the material, thereby significantly enhancing its catalytic activity for LC-CMM reforming process. The catalyst achieved a methane conversion rate of 53.3%, demonstrating excellent catalytic performance. Electrochemical evaluations revealed that SFNCMM-Gd0.1Ce0.9O2−δ (GDC) with a weight ratio of 7:3 exhibited superior electrochemical performance when employed as the anodic catalytic layer. With H2 and LC-CMM as fuels, the single cell achieved maximum power densities of 1467.32 and 1116.97 mW·cm−2 at 800°C, respectively, with corresponding polarization impedances of 0.17 and 1.35 Ω·cm2. Furthermore, the single cell maintained stable operation for over 100 h under LC-CMM fueling without significant carbon deposition, confirming its robust resistance to carbon formation. These results underscore the potential of medium-entropy oxides as highly effective catalytic layers for mitigating carbon deposition in SOFCs.