Water-Dispersible CsPbBr3 Perovskite Nanocrystals with Ultra-Stability and its Application in Electrochemical CO2 Reduction

Nano-Micro Letters

Tong Zhou¹  Igor Žutic¹  Paras N. Prasad²  Chang-Keun Lim²  Jiayong Zhang³  Tingqiang Yang⁴  Yupeng Zhang⁴  Zhinan Guo⁴  Keqiang Chen⁴  Kun Qi⁴  Han Zhang⁴ 

[1] Department of Physics, University at Buffalo, State University of New York;Institute for Lasers, Photonics, and Biophotonics, Department of Chemistry, University at Buffalo, State University of New York;Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology;Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Institute of Microscale Optoelectronics, Shenzhen University;

关键词: CsPbBr3 nanocrystals;    Water-dispersible;    Ultra-stability;    Electrochemical CO2 reduction;   

DOI  :  10.1007/s40820-021-00690-8

来源: DOAJ

【 摘 要 】

Abstract Thanks to the excellent optoelectronic properties, lead halide perovskites (LHPs) have been widely employed in high-performance optoelectronic devices such as solar cells and light-emitting diodes. However, overcoming their poor stability against water has been one of the biggest challenges for most applications. Herein, we report a novel hot-injection method in a Pb-poor environment combined with a well-designed purification process to synthesize water-dispersible CsPbBr3 nanocrystals (NCs). The as-prepared NCs sustain their superior photoluminescence (91% quantum yield in water) for more than 200 days in an aqueous environment, which is attributed to a passivation effect induced by excess CsBr salts. Thanks to the ultra-stability of these LHP NCs, for the first time, we report a new application of LHP NCs, in which they are applied to electrocatalysis of CO2 reduction reaction. Noticeably, they show significant electrocatalytic activity (faradaic yield: 32% for CH4, 40% for CO) and operation stability (> 350 h).

【 授权许可】

Unknown