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首页> 外文会议>International Symposium on Energy and Electrochemical Processes for a Cleaner Environment, 2001, San Francisco, CA >ELECTRODE WORK FUNCTION AND ABSOLUTE POTENTIAL SCALE IN SOLID STATE ELECTROCHEMISTRY
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ELECTRODE WORK FUNCTION AND ABSOLUTE POTENTIAL SCALE IN SOLID STATE ELECTROCHEMISTRY

机译：固态电化学中的电极工作功能和绝对电位标度

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A two Kelvin probe arrangement was recently used to measure for the first time in situ the work function, Φ, of the gas exposed surfaces of porous Pt, Au and Ag working and reference electrodes, exposed to O_2-He, H_2-He and O_2-H_2 mixtures, and deposited on 8%Y_2O_3-stabilized-ZrO_2 (YSZ) in a three-electrode solid electrolyte cell. It was found that at temperatures above 600 K the potential difference, U_(WR), between the working (W) and reference (R) electrode reflects the difference in the actual, spillover and adsorption-modified, work functions, Φ_W and Φ_R of the two electrodes: eU_(WR) = Φ_W-ΦR [1] This equation, typically valid over 0.8-1 V wide U_(WR) ranges, was found to hold for any combination of the Pt, Au and Ag electrodes. It is consistent with the previously reported equation: eΔU_(WR) = ΔΦ_W [2] also confirmed here and allows the definition of a natural absolute electrode potential U_(O_2)(abs) in solid state electrochemistry from: U_(O_2) (abs) = Φ/e [3] where Φ is the work function of the gas exposed electrode surface of the metal (any metal) electrode in contact with the YSZ solid electrolyte. It expresses the energy of "solvation" of an electron from vacuum to the Fermi level of the solid electrolyte. The value U_(O_2)~o (abs) =5.14(+-0.05) V was determined as the standard U_(O_2)(abs) value for YSZ at p_(O_2)=lbar and T=673 K.
机译：最近，两个开尔文探针装置首次用于原位测量暴露于O_2-He，H_2-He和O_2的多孔Pt，Au和Ag工作电极和参比电极的气体暴露表面的功函数Φ。 -H_2混合物，并沉积在三电极固体电解质电池中的8％Y_2O_3-稳定的ZrO_2（YSZ）上。发现在高于600 K的温度下，工作电极（W）和参比电极（R）之间的电势差U_（WR）反映了实际，溢出和吸附改性后的功函数Φ_W和Φ_R的差异。两个电极：eU_（WR）=Φ_W-ΦR[1]发现该公式通常在0.8-1 V宽U_（WR）范围内有效，适用于Pt，Au和Ag电极的任何组合。它与先前报告的等式一致：eΔU_（WR）=ΔΦ_W[2]在此也得到证实，并允许从以下公式定义固态电化学中的自然绝对电极电势U_（O_2）（abs）：U_（O_2）（abs ）＝Φ/ e [3]，其中，Φ是与YSZ固体电解质接触的金属（任何金属）电极的气体暴露电极表面的功函数。它表示电子从真空到固体电解质的费米能级的“溶剂化”能量。确定U_（O_2）〜o（abs）= 5.14（+-0.05）V的值作为YSZ在p_（O_2）= lbar和T = 673 K时的标准U_（O_2）（abs）值。

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