Amine-assisted exfoliation and electrical conductivity modulation toward few-layer FePS3 nanosheets for efficient hydrogen evolution. Issue 23 (30th May 2019)

• Record Type: Journal Article
• Authors: Yu, Zhi; Peng, Jing; Liu, Yuhua; Liu, Wenxiu; Liu, Haifeng; Guo, Yuqiao
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 23(2019)
• Page Start: 13928
• Page End: 13934
• Publication Date: 2019-05-30
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta03256h
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The change in electrical conductivity resulting from mixed valence and crystallinity optimizes the HER performance of FePS3 . Abstract : Layered metal phosphorus trichalcogenides (MPX3, M = transition metal, X = S or Se) have been established as new efficient catalysts for water splitting, with FePS3 as one representative example. Here, a novel amine-assisted exfoliation strategy is presented to obtain few-layer FePS3 nanosheets, whose intrinsic electrical conductivity can be easily regulated by adjusting the reaction temperature. The improved electrical conductivity originates from the increase of the Fe 3+ /Fe 2+ ratio, while matrix crystallinity also plays a vital role in this aspect. The combined effect of mixed valence and crystallinity results in superior HER performance with a decrease of the overpotential of 147 mV and a drop of the Tafel slope from 139 mV dec −1 to 94 mV dec −1 .