WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea.
Phys Chem Chem Phys. 2010 Nov 28;12(44):14699-705. doi: 10.1039/c0cp00977f. Epub 2010 Oct 14.
It is well known that the open-cell voltage (U) of a galvanic cell involving a binary compound, or a multinary compound with a single kind of mobile ionic species, is a state property under a gradient of chemical potential of the mobile component. It is not so transparent, however, whether U is still a state property when involving a ternary or multinary compound with two or more kinds of mobile ions under multiple chemical potential gradients of those mobile components. We clarify this issue with a multinary oxide that conducts oxide ions, protons and electron holes and is exposed to the chemical potential gradients of both water and oxygen. We show that U is path- and history-dependent, and manifests itself along the diffusion paths of the two mobile components H and O under given boundary conditions.
众所周知，涉及二元化合物或单一移动离子物种的多元化合物的原电池的开路电压 (U) 是在移动组分化学势梯度下的状态性质。然而，当涉及具有两种或更多种移动离子的三元或多元化合物，且这些移动组分具有多个化学势梯度时，U 是否仍然是状态性质则不那么明显。我们用一种同时传导氧离子、质子和电子空穴的多元氧化物来澄清这个问题，该氧化物暴露在水和氧的化学势梯度中。我们表明 U 是路径和历史相关的，并且在给定的边界条件下沿着两个移动组分 H 和 O 的扩散路径表现出来。
