The Effect of Dopant Precursor on PEC Performance of Nano-branched Hematite Photoanode
Paper ID : 1055-ICNS
Shima Farhoosh1, Milad Fathabadi1, Behrooz Eftekharinia2, Naimeh Naseri *1
1Department of Physics, Sharif University of Technology, Tehran, 1458889694, Iran
2School of Physics, Institute for Research in Fundamental Science (IPM), Tehran, 1953833511, Iran
Hematite (α-Fe_2 O_3) is one of the most studied semiconductors for photoelectrochemical (PEC) water oxidation due to its suitable band gap, high chemical stability, low costs, and theoretical maximum solar to hydrogen (STH) efficiency of 15%. However, short hole diffusion length, poor conductivity and slow kinetics for oxygen evolution are the main shortcomings of hematite to be an ideal photoanode for PEC water oxidation. Doping is a common way to overcome some of these shortcomings by improving conductivity, but doping with different precursors of an element provides different results. Here we investigated the effect of titanium butoxide (Ti(OBu)4) and titanium chloride (TiCl4) as the Ti source on the morphology and the PEC performance of nano-branched hematite photoanode. The photocurrent density of the sample doped with Ti(OBu)4 is achieved 1.78 mA/cm2 at 0.5 V vs. Ag/AgCl while it was 1.23 mA/cm2 for TiCl4 dopant which means titanium butoxide could lead to more improvements.
Hematite photoanode, Branched structure, Doped nanorods, PEC water splitting
Status : Abstract Accepted (Poster Presentation)