MoS2-MoO2 composite electrocatalysts by hot-injection method for hydrogen evolution reaction. (August 2017)

• Record Type: Journal Article
• Authors: Wu, Chia-Ling; Huang, Po-Chia; Brahma, Sanjaya; Huang, Jow-Lay; Wang, Sheng-Chang
• Is Part Of: Ceramics international. Volume 43(2017)Supplement 1
• Page Start: S621
• Page End: S627
• Publication Date: 2017-08
• Subjects: Composites -- Powders: chemical preparation -- Electrocatalyst; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.05.220
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Hydrogen has been considered as one of the most promising renewable energy for production and storage. Here, we report an efficient method to synthesize MoS2 -MoO2 composite by hot-injection method using MoO3 and S powder as precursors with oleic acid (OA) and oleylamine (OLA) as solvent, respectively. The X-ray diffraction shows the presence of the peaks from both MoS2 as well as MoO2 . With increasing reaction temperature and time, oleic acid reorganizes the octahedral units of MoO3 and gradually turn into low valence of Mo. After injecting S-precursor, OLA first reduces Mo-precursor to MoO2 as core, and then S atoms replace O atoms to form MoS2 as shell, eventually forming MoS2 -MoO2 core-shell structure. MoO2 with few-layer MoS2 can be observed by transmission electron microscope. A Tafel slope of 129 mV/dec is obtained for MoS2 -MoO2 composite, which is much better than MoS2 and MoO2 . The enhanced HER performance is attributed to the abundance active sites from MoS2 and the improved charge transfer direction by MoO2 .