10:30 AM - *ES10.01.01
Cocatalysts Decorated Amorphous Silicon Photoanodes for Efficient Bias-Free Water Splitting
Guilin University of Electronic Technology1
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.
References (12 pt)
. Zhang, Y. Cao, M. Liu, M. Du, S. J. Tian, R. Chen, P. Wang, J. Shi, S. Z. Frank Liu,* J. Zhang,* 2018, submitted.
D. Yang, L. Zhou, L. Chen, B. Zhao, J. Zhang,* C. Li,* Chem. Comm., 2012, 48, 8078.
. Yang, W. Yu, L. Zhou, J. Zhang,* C. Li,* Adv. Energy Mater. 2014, 4, 1400591.
D. Yang, P. Fu, F. Zhang, N. Wang, J. Zhang,* C. Li,* J. Mater. Chem. A 2014, 2, 17281.
C. Xu, P. Cai, X. W. Zhang, Z. L. Zhang, X. X. Xue, J. Xiong,* J. Zhang,* Sol. Energy Mater. Sol. C. 2017, 159, 136.
C. Xu, Y. Hu*, Z. Zhang, Y. Sheng, P. Jiang, H. Han, J. Zhang*, submitted.