Cathodic shift of onset potential for water oxidation on a Ti4+doped Fe2O3photoanode by suppressing the back reaction
Citations Over TimeTop 10% of 2013 papers
Abstract
We present a surface corrosion method to shift the photocurrent onset potential cathodically for water oxidation on a Ti4+ doped Fe2O3 by about 100 mV. After the surface treatment, the doped hematite photoanodes showed a similar photocurrent onset potential to the lowest values obtained by loading with electrocatalysts or depositing functional over-layers. Moreover, the cathodic shift of the onset potential was preserved well even after a long operating time. The results indicated the effectiveness of this simple surface treatment. In order to make clear the reason for the onset potential shift, the doped hematite samples before and after surface corrosion were investigated by SEM, X-ray photoelectron spectroscopy (XPS), inductively coupled plasma mass spectrometry (ICP-MS), photoluminescence spectroscopy (PL), electrochemical impedance spectroscopy (EIS), Mott–Schottky and so on. Based on the experimental evidence, we proposed a new mechanism for the onset potential shift. The cathodic shift of the onset potential was due to decreasing the back reaction, but not accelerating water oxidation kinetics, passivating surface states or ions adsorption as reported in the previous studies. This strategy of suppressing the back reaction can offer a reference to reduce the overpotential for other photoelectrodes.
Related Papers
- → Hierarchically branched Fe2O3@TiO2nanorod arrays for photoelectrochemical water splitting: facile synthesis and enhanced photoelectrochemical performance(2016)92 cited
- → Bi-functional Fe2ZrO5 modified hematite photoanode for efficient solar water splitting(2020)49 cited
- → Effect of oxygen evolution catalysts on hematite nanorods for solar water oxidation(2011)53 cited
- → Transition metal doped WSi2N4 monolayer for water splitting electrocatalysts: a first-principles study(2023)3 cited
- Thermodynamic and kinetic considerations about water splitting and competitive reactions in a photoelectrochemical cell(1988)