Constructing MoS2@Co1.11Te2/Co-NCD with Te nanorods for efficient hydrogen evolution reaction and triiodide reduction. (December 2022)

• Record Type: Journal Article
• Authors: Liu, Zhuolei; Yun, Sining; Sun, Menglong; Dang, Jiaoe; Zhang, Yongwei; Wang, Yinhao; Dang, Changwei; Deng, Yingying; Qiao, Dan
• Is Part Of: Materials today nano. Volume 20(2022)
• Publication Date: 2022-12
• Subjects: Molybdenum sulfide -- Telluride cobalt -- Bifunctional catalysts -- Triiodide reduction reaction -- Dye-sensitized solar cells -- Hydrogen evolution -- Counter electrode; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Nanoscience; Nanotechnology -- Periodicals; Periodicals; Periodical; Electronic journals; Electronic journals; 620.5
• DOI: 10.1016/j.mtnano.2022.100274
• Languages: English
• ISSNs: 2588-8420

Abstract

Abstract: Herein, we designed and constructed MoS2 @Co1.11 Te2 /Co-doped nitrogen carbon dodecahedron with Te nanorods (Co-NCD-T) by rational structure engineering. The as-synthesized MoS2 @Co1.11 Te2 /Co-NCD-T composite served as a bifunctional catalyst for the hydrogen evolution reaction and triiodide reduction reaction. The incorporation of Te nanorods provided additional charge transport channels and subsequently accelerated the electron transport between the electrode and electrolyte. The synergistic effect between Co1.11 Te2 and MoS2 further enhanced the catalytic activity. The MoS2 @Co1.11 Te2 /Co-NCD-T electrode catalyst showed an overpotential of 124 mV when the current density was 10 mA·cm −2 and a small Tafel slope of 49 mV·dec −1 in an alkaline medium. The assembled solar cell exhibited a superior conversion efficiency of 9.00%, significantly higher than Pt (7.32%). The proposed strategy based on rational structure engineering is expected to facilitate the fabrication of hybrids for multi-functional applications. Graphical abstract: Image 1 Highlights: The MoS2 @Co1.11 Te2 /Co-doped nitrogen carbon dodecahedron with Te nanorod (Co-NCD-T) is designed by rational structure engineering. MoS2 @Co1.11 Te2 /Co-NCD-T provides rich active sites and electron transport channels. MoS2 @Co1.11 Te2 /Co-NCD-T exhibits a high catalytic activity both in hydrogen evolution reaction and triiodide reduction reaction. MoS2 @Co1.11 Te2 /Co-NCD-T exhibits comparable value of Tafel slope to Pt/C electrode. The power conversion efficiency of MoS2 @Co1.11 Te2 /Co-NCD-T (9.00%) is much higher than that of Pt (7.76%).