High temperature recrystallization of kersterite Cu2ZnSnS4 towards enhanced photocatalytic H2 evolution》.pdf

i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y x x x ( 2 0 1 5 ) 1 e7 Available online at ScienceDirect journal homepage: /locate/he High temperature recrystallization of kersterite Cu2ZnSnS4 towards enhanced photocatalytic H2 evolution Zhi-Xian Chang a,b, Rui-Feng Chong b, Yue-Na Meng a, Wen-Hui Zhou a,c, *, Dong-Xing Kou a, Zheng-Ji Zhou a, Si-Xin Wu a,c, ** a The Key Laboratory for Special Functional Materials of MOE, Henan University, Kaifeng 475004, China b Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China c Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng 475004, China a r t i c l e i n f o a b s t r a c t Article history: Kesterite Cu ZnSnS (CZTS) with different crystallinities were obtained by high tempera- 2 4 Received 21 June 2015 ture recrystallization of as-prepared kesterite CZTS nanocrystals under elevated temper- Received in revised form ature. The effect of temperature on the crystallinity, crystallite size and specific surface 31 July 2015 area, thus the photocatalytic H2 evolution activity were discussed in detail. The maximum Accepted 1 August 2015 photocatalytic H2 evolution rate was achieved under an intermediate annealing tempera- Available online xxx ture (450 and 550 C), which show moderate crystallinity and specific surface area. How-