Ruthenium single atoms implanted continuous MoS2-Mo2C heterostructure for high-performance and stable water splitting

Hoa, Van Hien and Tran, Duy Thanh and Prabhakaran, Sampath and Kim, Do Hwan and Hameed, Nishar and Wang, Hao and Kim, Nam Hoon and Lee, Joong Hee (2021) Ruthenium single atoms implanted continuous MoS2-Mo2C heterostructure for high-performance and stable water splitting. Nano Energy, 88:106277. pp. 1-11. ISSN 2211-2855


Abstract

Merging metal single atoms into a nanostructure is a novel approach to motivate the number and types of active centers for boosting catalytic activities towards both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in water splitting. Herein, we reported a continuous molybdenum sulfide-carbide heterostructure-based nanosheets incorporated with ruthenium atoms (2.02 at%) and shelled over high-conductive 1D titanium nitride nanorod arrays (Ru-MoS2-Mo2C/TiN) to form a 3D hierarchical porous material via an effective synthesis strategy. The material with fine-tuned electronic structure and multi-integrated active sites exhibited small overpotentials of 25 and 280 mV at 10 mA cm(-2) for HER and OER in 1.0 M KOH medium, respectively. An electrolyzer delivered from Ru-MoS2-Mo2C/TiN required an operating voltage of only 1.49 V at 10 mA cm(-2), surpassing that of a commercial catalyst-based system as well as earlier reports. The good performance was identified by its enlarged electroactive surface area and superior charge-transfer ability. In addition, theoretical calculations further showed its reasonable density of states near the Fermi level together with optimum adsorption free energy for reactants. The result indicated that the Ru-MoS2-Mo2C/TiN on CC is an excellent bifunctional electrocatalyst for hydrogen production by electrochemical water splitting.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 08 Mar 2022 00:13
Last Modified: 30 Mar 2022 05:15
Uncontrolled Keywords: Ruthenium atoms; MoS2-Mo2C heterostructures; Bifunctional electrocatalyst; Water splitting
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering
Identification Number or DOI: https://doi.org/10.1016/j.nanoen.2021.106277
URI: http://eprints.usq.edu.au/id/eprint/46363

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