Developmert of Scanning Chemical Potertial Microscope

这项研究的目的是开发一种“扫描化学电势显微镜”，测量催化剂或电极上的化学势分布，以研究反应动力学。在本研究项目中，我们发明了一种氧势探针，并将其应用于固体氧化物电解液上气体电极反应的研究。(1)提出了多孔氧传感器的概念。将稳定的氧化锆或氧化铈烧结成多孔球，并将其涂在样品表面。用电位法测量了样品表面的氧势。(2)将POS方法成功地应用于离子/电子混合导体电极上氧掺入反应的动力学研究。用POS法测定了两种表面反应过程的过电压。(3)动力学模型和POS法得到的参数比较合理，证明了POS法用于定量分析是可行的。(4)在铂基金属丝上包覆氧化锆粉制备了POS微探针。在微米级空间内实现了与正常POS结构相同的拓扑结构。用市售的微量热分析探头作为良好的铂-Rh探针基。采用料浆包覆法和金属有机前驱体热分解法对YSZ进行包覆。利用后一种方法制作了横向分辨率高于1微米的精细探头。(5)制作了用于YSZ基电解液现场测量的样品加热台。它安装在原子力微探针扫描仪上，工作频率为700℃。(6)在LaMnO_3基电极上成功地进行了表面氧势的空间分辨分析。

The objective of this research has been to develop a "scanning chemical potential microscope" that measures the chemical potential profiles on catalysts or electrodes in order to investigate the reaction kinetics. In this research project, we have invented an oxygen potential probe, and applied it for the investigation of gas electrode reaction on a solid oxide electrolyte.(1)The concept of Porous Oxygen Sensor (POS), was developed. Stabilized zirconia or ceria was sintered into a porous pellet, and put on a sample surface. Oxygen potential on the sample surface was measured against a Pt reference electrode that was applied on the other side of POS by a potentiometric method.(2) The POS method was successfully applied to the kinetic study of oxygen incorporation reaction through a mixed ionic / electronic conductor electrode. The overvoltage for the two surface reaction processes were determined by using POS.(3) Kinetic model and the parameters obtained by POS were quite reasonable, proving that POS method is usable for a quantitative analysis.(4) POS microprobes were fabricated by coating zirconia powders on Pt based metal wires. The topologically identical structure with normal POS was realized in a micrometer space. A commercial probe for micro thermal analysis was used as a fine Pt-Rh probe base. It was coated with YSZ in two methods, i.e. slurry coating and thermal decomposition of metal organic precursors. By the latter method, a fine probe with lateral resolution higher than one micron was fabricated.(5) Sample heating stage was fabricated for the in-situ measurements of YSZ based electrolyte. It was installed on an atomic force micro probe scanner, and operated at 700 ℃.(6) Space resolved analysis of surface oxygen potential was successfully performed on a LaMnO3 based electrode.