| 초록 |
This study examines the electrocatalytic activity of double-layered oxide electrodes comprising a ~1um-thick Ta-IrO2 underlayer (coated on a Ti plate) and ~3.5um- and ~5.5um-thick nanoparticulate TiO2 overlayers (TEC-1 and TEC-2) in NaClO4 and NaCl solutions as non-active and active supporting electrolytes. The physicochemical features of both TEC samples, including the crystalline pattern, elemental states, morphology, and electrochemically active surface area are very similar. The TEC-1 electrode shows ~54% lower electrode/electrolyte interfacial charge-transfer resistances than those of TEC-2. In the bulk electrolysis for the decomposition of ammonia, the current density with the TEC-1 electrode is two-fold larger than that with TEC-2 under the same potential, due to the relatively low interfacial charge transfer with TEC-1. The effect of the TiO2 overlayer thickness on the efficiency and durability of the electrodes is discussed in detail. |
