A highly active CH₄ catalyst correlated with solid oxide fuel cell anode performance
2021
Su, Yuanhui | Wei, Tao | Li, Yining | Yin, Baoyi | Huan, Yu | Dong, Dehua | Hu, Xun | Huang, Bolong
Methane catalytic abilities are considered to be an important and direct form of experimental evidence for evaluating the efficacy of mixed oxide-ion/electron conductors (MIEC) as anode materials for solid oxide fuel cells (SOFCs) with CH₄ as the fuel gas. Therefore, a direct link between the quantifiable methane-conversion abilities and CH₄-based SOFC electrochemical performance is urgently needed. Here, H₂-reduced Sr₂ZnMoO₆ (R-SZMO) as an anode example exhibits excellent catalytic abilities and tolerance to coking when using CH₄ as the fuel gas, which is dominated by the formation of intrinsic anion-Frenkel defect pairs. DFT calculations reveal that the efficient electron transfer process and optimal selectivity towards CH₄ conversion are both on the R-SZMO (110) surface. Therefore, applying high CH₄ activity R-SZMO as the anode catalyst gives excellent anti-carbon deposition performance, high power output, and long-term stability for SOFCs with CH₄ as the fuel gas.
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