Abstract:

In this paper, an YSZ electrolyte layer was spray-coated on NiO/YSZ anode suhstrate , and the corresponding single cell of solid oxide fuel cell (SOFC) was assemhled and tested. Then , CHI electrochemical station and SEM were used to test and analyze the voltage-current characteristics, the impedance spectra and the section microstructure of the cell. The test results indicate that the cell works and the open-circuit voltage (OCV) .decreases with the increase of the temperature. Concretely , when the temperature increases from 500℃ to 800℃， the OCV decreases from 1. 054 V to 0. 963 V and the maximum power density reaches 57 x 10^-3W/cm² at 800 ℃. Moreover, it is found that the interface resistance dominates at low temperature and markedly decreases when the temperature increases , and that the Ohmic resistance of SOFC mainly results from the YSZ electrolyte layer in ahout 30μm thickness and the inhomogeneous anode microstructure.

Key words: fuel cell, solid oxide, colloidal spray coating, anode-supporting