报告题目：Efficient photoelectrodes for solar water splitting

　　主 讲 人：罗文俊 副研究员 (南京大学)

　　时　　间：7月31日（周四）14:30—16:00

　　地　　点：李薰楼 468 会议室

　　报告简介：

　　The consumption of fossil fuels creates energy shortage and serious environment issues, which limits sustainable development of the society. Solar energy is the most abundant renewable energy in the world. However, it needs to be stored as chemical energy due to its low energy density, uneven distribution and discontinuous radiation. Hydrogen is considered as a promising clean energy carrier for the future. In a photoelectrochemical water splitting cell, a Schottky-like junction forms at the solid-electrolyte interface and separates photo-generated carriers. Since Fujishima and Honda originally reported that a TiO2 based photoelectrochemical cell could split water into hydrogen and oxygen in 1972 [1], intensive researches have been done to improve the performance of the photoelectrochemical cell in the past forty years [2-3]. However, the solar energy conversion efficiency is still low. Exploring efficient photoelectrodes is a key challenge in solar water splitting for hydrogen production.

　　In this talk, I will present several kinds of methods to improve a photoelectrode’s performance, including heterojunction [4], shallow level doping [5-7], removal of surface recombination centers [8-9], morphology control [10] and suppressing back reaction [11]. After modifying, we have obtained record solar photocurrent on BiVO4 and Ta3N5 photoelectrodes for water splitting.[6] , [9] Moreover, we have used the BiVO4 photoelectrode to split natural seawater outdoors, which is more attractive because solar energy and seawater are the most abundant renewable energy source and the most abundant natural resource on the earth, respectively. Our findings are important progress in this field and offer guidance to improve photoelectrochemical performance of other materials.

　　References

　　[1] Fujishima, A.; Honda, K. Nature 238, 37(1972)

　　[2] Walter, M. G.; Warren, E. L.; McKone, J. R.; Boettcher, S. W.; Mi, Q.; Santori, E. A.; Lewis, N. S. Chem. Rev. 110, 6446 (2010)

　　[3] Li, Z.; Luo, W.; Zhang, M.; Feng, J.; Zou, Z. Energy Environ. Sci. 6,347 (2013)

　　[4] Luo, W.; Tao Yu, T.; Wang, Y.; Li, Z.; Ye, J.; Zou, Z. J. Phys. D: Appl. Phys. 40, 1091 (2007)

　　[5] Zhao, Z.; Luo, W.; Li, Z.; Zou, Z. Phys. Lett. A 374, 4919 (2010)

　　[6] Luo, W.; Yang, Z.; Li, Z.; Zhang, J.; Liu, J.; Zhao, Z.; Wang, Z.; Yan, S.; Yu, T.; Zou, Z. Energy Environ. Sci. 4, 4046 (2011)

　　[7] Luo, W.; Wang, J.; Zhao, X.; Zhao, Z.; Li, Z.; Zou, Z. Phys. Chem. Chem. Phys, 15, 1006 (2013)

　　[8] Luo, W.; Li, Z.; Yu, T.; Zou, Z. J. Phys. Chem. C. 116, 5076 (2012)

　　[9] Li, M.; Luo, W.; Cao, D.; Zhao, X.; Li, Z.; Yu, T.; Zou, Z. Angew. Chem. Int. Ed. 52, 11016 (2013)

　　[10] Zhao, X.; Luo, W.; Feng, J.; Li, M.; Li, Z.; Yu, T.; Zou, Z. Adv. Energy Mater. 4, 1301785 (2014)

　　[11] Cao, D.; Luo, W.; Feng, J.; Zhao, X.; Li, Z.; Zou, Z. Energy Environ. Sci. 7, 752 (2014)

　　欢迎所内职工及研究生前来交流！