Co3O4-decorated hematite nanorods as an effective photoanode for solar water oxidation
Tran, Phong D.
Chiam, Sing Yang
Bassi, Prince Saurabh
Mak, Wai Fatt
Mulmudi, Hemant Kumar
Batabyal, Sudip Kumar
Loo, Say Chye Joachim
Wong, Lydia Helena
Date of Issue2012
School of Materials Science and Engineering
In this paper, we report a strategy to perform in-situ incorporation of oxygen evolution catalyst (OEC), Co3O4, during hydrothermal growth of Fe2O3 nanorod arrays. It was found that the highest photocurrent increase and onset potential shift was observed with 5% Co2+. The photocurrent density increases from 0.72 for the pristine Fe2O3 nanorod to 1.20 mA/cm2 at 1.23 V vs RHE (i.e. 67 % improvement) with 5 % Co2+ added. Concomitant with this improvement was a shift in the onset potential by about 40 mV and improvements in incident-photo-to-current-efficiencies (IPCE) and oxygen evolution. Hematite photoanodes with in-situ deposition of Co3O4 nanoparticles showed better performance than those prepared by ex-situ procedures because of high surface roughness, larger Co3O4/hematite interfacial area and smaller Co3O4 particle size.
Journal of physical chemistry C
© 2012 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Physical Chemistry C, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: DOI: [http://dx.doi.org/10.1021/jp304285r].