title: Polyelectrolyte assisted synthesis and enhanced oxygen reduction activity of Pt nanocrystals with controllable shape and size.
abstract: The shape control of platinum nanocrystals is significant to the enhancement of their catalytic performance in terms of activity and selectivity. However, it still remains a major challenge to prepare Pt nanocrystals with tunable shape and clean surface in an eco-friendly way. This article develops a facile and green strategy to prepare well tuned platinum nanocrystals employing poly(diallyldimethylammonium chloride) (PDDA) as the capping agent, reductant, and stabilizer simultaneously in a facile hydrothermal process. It is identified that the variation of PDDA concentration is crucial to control the growth of crystalline facets, leading to the formation of cubic, truncated cubic, and octahedral Pt nanocrystals with sizes tunable from ca. 17 nm to ca. 50 nm. The resultant Pt nanocrystals exhibit excellent electrocatalytic activity and stability toward the oxygen reduction reaction (ORR) in acidic media compared with those of commercial Pt black and the state-of-the-art Pt/C catalyst. It is proposed that the preferential Pt surface and the decoration of PDDA, which modulates the electronic structures and electrooxidation of Pt nanocrystals, synergistically contribute to the enhanced catalytic performance.
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , 92 West Dazhi Street, Harbin 150001, China.
authors: Lei
authors: L
authors: Du
authors: Sheng
authors: S
authors: Zhang
authors: Guangyu
authors: G
authors: Chen
authors: Geping
authors: G
authors: Yin
authors: Chunyu
authors: C
authors: Du
authors: Qiang
authors: Q
authors: Tan
authors: Yongrong
authors: Y
authors: Sun
authors: Yunteng
authors: Y
authors: Qu
authors: Yunzhi
authors: Y
authors: Gao