论文题目：A green strategy to synthesize two-dimensional lead halide perovskite via direct recovery of spent lead-acid battery
论文作者：Junxiong Wang, Jiakuan Yang, Huijie Hou, Wei Li*, Jingping Hu, Mingyang Li, Wenhao Yu, Zhongyi Wang, Sha Liang, Keke Xiao, Bingchuan Liu, Kai Xi, R. Vasant Kumar
Hybrid organic-inorganic perovskite is a class of emerging materials with promising application prospects in optoelectronics. However, the consumption oflead resources and poor stability in moisture environment have limited their practical applications. Herein, a family of air-stable two-dimensional (2D) hybrid organic-inorganic perovskite crystal (C4H9NH3)(2)PbX4 (X=Cl, Br, I or mixed halides of them) is efficiently synthesized by directrecoveryofspentlead-acidbattery (LAB) paste. More than 95 wt% of the total lead element in spentlead paste could be recovered and converted into low-impurity lead ion solution viaa facile recovery process at room temperature. Then 2D hybrid perovskite crystal is synthesized from the recovered lead ion solution with a one-pot solvent evaporation method. Excellent air stability is observed for the prepared perovskite crystals after exposure in high-humidity air at a high temperature of 75 degrees C, attributing to its layered structure which is capped with long-chain hydrophobic alkyl groups. The emission wavelengths of the synthesized perovskite crystals are tunable from 380 to 560 nm (corresponding to visible purple to yellow light) by compositional modulations, demonstrating their potential applications as optoelectronic materials. This research has proposed a promising strategytosynthesize high-value 2D hybrid perovskite optoelectronic materials directly recovered from spent LAB.