A 20 mm × 40mm piece of as-received AISI 304-stainless steel
(SS) plate was sonicated in deionized water and degreased in isopropyl alcohol (IPA) for 10 min. In order to attain required weight
and thickness of cobalt film, the EPD bath was prepared by suspending the SS plates in Co(NO3)2·6H2O (10 mg) with 50 ml IPA. The
EPD was performed at room temperature and a voltage difference
of 10 V was applied between two SS plates for 30 s. Fig. 1a shows
the schematic diagram of the EPD set up used for the preparation
of catalyst on SS. After deposition, the film was dried at 100
◦
C for
1 h in air