10:30 AM - *ES10.01.01
Cocatalysts Decorated Amorphous Silicon Photoanodes for Efficient Bias-Free Water Splitting
Jian Zhang1
Guilin University of Electronic Technology1
Show Abstract
Silicon materials has many advantages, including earth-crust, wide spectra absorption, high solar to chemicals conversion efficiency, suitable band edge. However, the amorphous silicon-based photoelectrode is very easily to be corroded by electrolyte. In the presentation, cobalt oxide by magnetron sputtering at ambient temperature was introduced as a protective layer in water oxidation, and atomic Pt as HER cocatalysts prepared by magnetron sputtering method on thin film silicon was used for water reduction. The photoanode delivered a current density of 7.3 mA cm-2 at 1.23V vs. RHE, and the onset potential was negative shift to 0.62 V. The photocathode current density at the 0 V vs RHE was increased to 12.03 mA cm-2 in 1M KOH electrolyte with the onset potential of 0.82 V. The Pt/Si faradic efficiency was ~ 100 % and the fill factor was 38 % that was the highest value among Si-based PEC system. Pt and CoOx strengthened the inner electric field and passivated the surface of photoelectrodes. The dual-amorphous silicon photoelectrodes integrated CoOx and Pt realized the bias-free water splitting at 0.81 V with a photocurrent of 1.5 mA cm-2, and 0.92 % of the solar to hydrogen efficiency. The novel amorphous silicon photoanode provides a promising strategy for photo-electrochemical energy conversion and storage.
Acknowledgement: This research was financially supported by the National Natural Science Foundation of China (61564003, 61774050), and the Guangxi Natural Science Foundation (2015GXNSFGA139002), and the Guangxi Bagui Scholar program.
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