Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Water splitting photoelectrodes, based on buried p–n junctions, usually offer an improved photovoltage and therefore a higher solar-to-hydrogen efficiency in tandem cells. These photocathodes can be modelled as a photovoltaic junction in series with an electrocatalyst and in many cases a protective layer is necessary as well. Due to the complexity of the devices, a method enabling the deconvolution of the photovoltaic and electrocatalytic performance would provide key insight into how to improve the overall performance. In this work, we further developed the dual-working-electrode (DWE) technique to probe the surface potential of protected photocathodes during operation. As a result, properties of the buried p–n junction can be accessed, independent of the surface kinetics. Additionally, we can gain the information related to the charge transfer through the electrode/electrolyte interface independent of the photovoltaic properties. What's more, the DWE technique provides a clearer understanding of the photocathode degradation during stability tests. A pn+-Si/TiO2 photocathode is used as a model platform for developing the DWE technique, and then the versatility of the method is demonstrated through application to an emerging material system Cu2O/Ga2O3/TiO2.
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