Effect of a reducing agent for silver on the electrochemical activity of an Ag/Ba0.5Sr0.5Co0.8Fe0.2O3−δ electrode prepared by electroless deposition technique
✍ Scribed by Wei Zhou; Ran Ran; Rui Cai; Zongping Shao; Wanqin Jin; Nanping Xu
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 925 KB
- Volume
- 186
- Category
- Article
- ISSN
- 0378-7753
No coin nor oath required. For personal study only.
✦ Synopsis
Silver-modified Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-ı (Ag/BSCF) electrodes were prepared using an electroless deposition technique. The morphology, microstructure and oxygen reduction reaction activity of the resulted Ag/BSCF electrodes were comparatively studied using Fourier transform infrared spectra, environmental scanning electron microscopy, temperature-programmed oxygen desorption, X-ray diffraction, and electrochemical impedance spectroscopy. An area-specific resistance as low as 0.038 cm 2 was achieved for N 2 H 4 -reduced Ag/BSCF cathode at 600 • C. Carbonates were detected over the BSCF surface during the reduction of silver, which deteriorated both the charge-transfer process and diffusion process of HCHO-reduced Ag/BSCF cathode for the oxygen electrochemical reduction reaction. An anode-supported single cell with an N 2 H 4 -reduced Ag/BSCF cathode showed a peak power of 826 mW cm -2 at 600 • C. In comparison, only 672 mW cm -2 was observed with the HCHO-reduced Ag/BSCF cathode.