| 초록 |
Metal-oxyhydroxide, particularly, Iron oxide and Iron oxyhydroxide were deposited on FTO and Ni Foam substrate using simple dip coating method. A well controlled nanospindle (NSs) like structures was achieved at optimized preparative parameters (dipping cycles, temperature, etc.). A further annealing in oxygen ambience at 3000C transformed FeOOH to Fe2O3 and Fe3O4 nanorod structures. Highly crystallized and thoroughly oriented nanorod (NRs) structures having different areal densities were obtained. The EDS studies indicated formation of FeOOH and Fe2O3 phases. The electrocatalytic (EC) activity of the synthesized NSs was studied in 1M KOH solution, indicating high EC performance with lower overpotential (less than 250 mV) and higher current densities, which is highly competitive compared to the reported literature. The stability performance was also checked and it was found that the electrode is highly stable for more than 20 hr @10mA/cm2. Additionally, the Fe2O3 NRs showed effective activity of OER after light illumination, thereby indicating high photoelectrochemical (PEC) performance. Such a high EC and PEC performance was due to the fact of the well controlled nanostructures and good charge transfer mechanisms offered by these electrodes. |
