| 초록 |
To improve the activity of electrodeposited hematite (α-Fe2O3) electrodes on photoelectrochemical (PEC) water oxidation, metal element (Sn) was doped on hematite during the synthesis. When hematite is doped with Sn4+, carrier density is significantly increased due to an extra electron in substituted Sn4+ at Fe3+ sites so electrical conductivity of hematite is enhanced. Along with dopant substitution, hydrogenation is also facile and effective method to improve the electrical conductivity of hematite by making oxygen deficient sites (Fe2+ and/or oxygen vacancy) in hematite. In this work, a dual modification (Sn4+ doping and hydrogenation) was subsequently carried out on hematite electrodes. In dual modified Fe2O3 (H-Sn-Fe2O3), simultaneous Sn4+ substitution and Fe2+ generation by hydrogenation can compromise mutual charge mismatch similar with co-doping (e.g., substitutional M2+ and M4+ co-doping in M3+ core metal oxide) and maximize the generation of donor density in its structure. |
