Highly active and stable layered ternary transition metal chalcogenide for hydrogen evolution reaction. (October 2016)

• Record Type: Journal Article
• Authors: Tiwari, Anand P.; Kim, Doyoung; Kim, Yongshin; Prakash, Om; Lee, Hyoyoung
• Is Part Of: Nano energy. Volume 28(2016:Oct.)
• Page Start: 366
• Page End: 372
• Publication Date: 2016-10
• Subjects: Ternary transition metals chalcogenide -- Se-doping -- Single layer -- Hydrogen evolution reaction; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.08.065
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Layered ternary transition metal chalcogenides (TTMCs) material has great potentials that can overcome to the limitation of active sites which is challenging in binary transition metal chalcogenides (BTMC), such as MoS2, towards electrochemical hydrogen production. Here, we demonstrate TTMC material which contains two transition metals Cu and Mo with chalcogen S. The TTMC, Cu2 MoS4 has been successfully synthesized by a facile solution-processed method. Moreover, by anion doping such as Se in as the synthesized Cu2 MoS4, it has been found that TTMC can be exfoliated into single layer nanosheets. Furthermore, by controlling the number of layers, single layers TTMC exhibit the highest electrocatalytic activity towards hydrogen evolution reaction (HER) because the single layers can provide more catalytic active sites than multilayers and bulk. The onset potential for hydrogen generation is −96 mV for single layer TTMC electrode material with corresponding Tafel slope 52 mV/decade. After 1000 cycles with continuous electrolysis in acid electrolyte for 15 h, the electrode material preserves its structure and robust catalytic activity perfectly. Our new TTMC materials show highly active electrocatalytic performance and high stability which overcome the intrinsic limitation of BTMC. As a result, our work can guide new strategy for the developments of real applications of TMCs in HER. Graphical abstract: Effective approaches to synthesis of single layered ternary transition metal chalcogenide (TTMC) have been developed to produce highly active and stable electrocatalyst towards hydrogen evolution reaction. The single layered TTMC are achieved by Se-doping in Cu2 MoS4 which can be applicable for other transition metal chalcogenide (TMC). Highlights: Single layered ternary transition metal chalcogenides have been synthesized for highly active and stable electrocatalyst. Se-doping plays an essential role to exfoliate Cu2 Mo(S1-y Sey )4 for high electrochemical active surface. Se-doping strategy can be implemented to exfoliate and enhance electrocatalytic activity of transition metals chalcogens.