In order to understand the hydrogen oxidation reaction (HOR) mechanism in real Ni/YSZ porous anodes, the electrochemical properties as a function of hydrogen partial pressure p(H₂) and water vapor pressure p(H₂O) (dry, 1% - 60% humidity) at 973 K of a commercial anode-supported solid oxide fuel cell (SOFC) were measured. The impedance spectra from electrochemical impedance spectroscopy (EIS) measurement were analyzed by 1-D approximation transmission line model (TLM) to observe changes in the reaction resistance (r_P) between the Ni/YSZ and reaction capacitance (C_p) from the anode. From the analysis, r_p is essentially independent over p(H₂) in dry atmosphere but decreased with increasing p(H₂O) at the anode side. In contrast, the r_p shows a large dependency on p(H₂) in wet atmosphere indicating that the rate-limiting step of HOR is probably different between dry and wet atmospheres. On the other hand, the C_p is independent of p(H₂) in dry and wet condition. However, similar to r_p, it has strong dependency on p(H₂O). From these results, the difference in HOR between dry and wet atmospheres is assumed to be an additional reaction pathway formed in the latter where the formation of OH⁻_ad on the Ni metal surface possibly enhanced the HOR rate.

为了了解实际的Ni / YSZ多孔阳极中的氢氧化反应（HOR）机理，电化学性质随氢分压p（H ₂）和水蒸气压p（H ₂ O）（干重1％ -在973 K下测量了商用阳极支撑的固体氧化物燃料电池（SOFC）的60％湿度）。通过一维近似传输线模型（TLM）分析电化学阻抗谱（EIS）测量的阻抗谱，以观察Ni / YSZ之间的反应电阻（r _P）和来自阳极的反应电容（C _p）的变化。 。从分析，[R _p在干燥气氛中，p（H ₂）基本独立于p（H ₂），但在阳极侧随p（H ₂ O）的增加而降低。相反，r _p在潮湿气氛中对p（H ₂）的依赖性很大，表明HOR的限速步骤在干燥气氛和潮湿气氛之间可能不同。另一方面，在干燥和潮湿条件下，C _p与p（H ₂）独立。但是，类似于r _p，它对p（H ₂O）。从这些结果可以看出，干燥和潮湿气氛之间的HOR差异是在后者中形成的另一个反应途径，其中在Ni金属表面上形成OH ^- _ad可能会提高HOR速率。