Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.183
Publication date: 6th July 2018
Over the past years, α-Fe2O3 (hematite) has been considered as a promising photoanode material in photoelectrochemical (PEC) water splitting. In spite of significant success in obtaining relatively high PEC performance, the main drawbacks hindering practical application at hematite are related to an intrinsically poor charge transport and an inferior kinetics of the oxygen evolution reaction on the photoelectrode surface. In this presentation, we will discuss a strategy for reducing onset potential of hematite photoanode by coupling of gradient Sn4+ ion doping and Zn-Co LDH serving as a highly active OER catalyst. The gradient Sn doping in hematite influences the space charge layer (SCL), which is critical for charge separation and thus for an enhanced photoelectrochemical water splitting performance (PEC). The OER catalyst, i.e. Zn-Co LDH nano-sheets have been synthesized by a simple microwave treatment. The synergistic effect of Zn-Co LDH decoration and gradient Sn4+ doping results in decreasing the onset potential of more than 300 mV, from 0.86 VRHE to 0.54 VRHE, and in increasing the photocurrent density from 0.60 mA/cm2 to 2.00 mA/cm2 at 1.50 VRHE. Our approach demonstrates strategies to overcome onset potential limitations as well as poor OER properties of hematite and leads to a remarkably improved PEC water splitting performance.
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