A novel TiN coated CNTs nanocomposite CNTs@TiN supported Pt electrocatalyst with enhanced catalytic activity and durability for methanol oxidation reaction. (27th April 2017)

• Record Type: Journal Article
• Authors: Liu, Gen; Pan, Zhanchang; Zhang, Bo; Xiao, Jun; Xia, Guowei; Zhao, Qixiang; Shi, Shikun; Hu, Guanghui; Xiao, Chumin; Wei, Zhigang; Xu, Yanbin
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 17(2017)
• Page Start: 12467
• Page End: 12476
• Publication Date: 2017-04-27
• Subjects: Titanium nitride -- Methanol oxidation reaction -- High activity and stability -- Fuel cells; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.03.181
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The application of direct methanol fuel cells (DMFCs) is hampered by not only low activity but also poor stability and poor CO tolerance by the Pt catalyst. Herein, a novel titanium nitride coated multi-walled carbon nanotubes (CNTs@TiN) hybrid support was successfully synthesized by a facile solvothermal process followed by a nitriding process, and this hybrid support was used as Pt support for the oxidation of methanol. The structure, morphology and composition of the synthesized CNTs@TiN exhibits a uniform particle perfect coating with high purity and interpenetrating network structure. Notably, Pt/CNTs@TiN also showed excellent stability, experiencing only a slight performance loss after 5000 potential cycles. The onset potential (0.34 V) of CO oxidation on Pt/CNTs@TiN is obviously more negative than that on the Pt/TiN (0.38 V) and Pt/CNTs (0.48 V) in the first forward scan. In the Pt 4f XPS spectra, plentiful Pt atoms existed as Pt(II) in the Pt/CNTs and Pt/TiN catalysts, while a relatively smaller amount of Pt(II) was observed in the Pt/CNTs@TiN catalyst. The synthetic Pt/CNTs@TiN catalyst was studied with respect to its electrocatalytic activity and durability and CO tolerance toward methanol oxidation might be mainly attributed to the strongly coupled Pt–TiN and the fast electron-transport network structure. This work may provide more insight into developing novel catalyst supports of various transition metal nitrides coated CNTs for DMFCs with high activity and good durability and excellent CO tolerance. Graphical abstract: CNTs@TiN hybrid is successfully synthesized and used as the support for Pt, and the experimental results show that Pt/CNTs@TiN have a much higher catalytic activity and durability than Pt/CNTs electrocatalyst for methanol electrooxidation. Highlights: CNTs@TiN support with an interactive porous three-dimensional structure and high surface area was synthesized. Pt nanoparticles with small size were well dispersed on CNTs@TiN support. CNTs@TiN combines high conductivity and superb corrosion resistance. The catalyst shows remarkably enhanced methanol oxidation activity and durability.