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Pan Z.,Guangdong University of Technology | Xiao Y.,Guangdong University of Technology | Fu Z.,Guangdong University of Technology | Zhan G.,Guangdong University of Technology | And 4 more authors.
Journal of Materials Chemistry A | Year: 2014

We describe a route to the development of robust non-carbon TiN nanotubes (TiN NTs) used as a support for Pt, and the catalyst exhibits high activity and stability for the oxygen reduction reaction (ORR). The accelerated durability test (ADT) reveals that the novel supporting material can dramatically enhance the durability of the catalyst and maintain the electrochemically active surface area (ECSA) of Pt, which shows great improvement in ECSA loss with 77% of the initial ECSA remaining even after 12000 ADT cycles, which is much higher than the commercial Pt/C (E-TEK) catalyst. The experimental data verified the strong metal/support interaction between Pt nanoparticles (NPs) and the TiN NTs support. The surface of the TiN NTs is composed of dendrite nanocrystals, which may function as 'hunters' for re-capture and re-nucleation of the Pt species (atoms or clusters) that would dissolve into the electrolyte, which prevents leaching and migrating of dissolved Pt NPs. This new approach opens a reliable path for designing various TiN NT-supported catalysts for a wide range of applications in energy conversion processes. This journal is © the Partner Organisations 2014.


Xiao Y.,Guangdong University of Technology | Zhan G.,Guangdong University of Technology | Fu Z.,Guangdong University of Technology | Pan Z.,Guangdong University of Technology | And 5 more authors.
Electrochimica Acta | Year: 2014

By the combination of solvothermal alcoholysis and post-nitriding method, titanium nitride nanotubes (TiN NTs), with high surface area, hollow and interior porous structure are prepared successfully and used at a support for Pt nanoparticles. The TiN NTs supported Pt (Pt/TiN NTs) catalyst displays enhanced activity and durability towards methanol oxidation reaction (MOR) compared with the commercial Pt/C (E-TEK) catalyst. X ray diffraction (XRD), nitrogen adsorption/desorption, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) measurements are performed to investigate the physicochemical properties of the synthesized catalyst. SEM and TEM images reveal that the wall of the TiN NTs is porous and Pt nanoparticles supported on the dendritic TiN nanocrystals exhibit small size and good dispersion. Effects of inherent corrosion-resistant, tubular and porous nanostructures and electron transfer due to the strong metal-support interactions of TiN NTs contribute to the enhanced catalytic activity and stability of Pt/TiN NTs towards the MOR. © 2014 Elsevier Ltd.


Zhan G.,Guangdong University of Technology | Fu Z.,Guangdong University of Technology | Sun D.,Guangdong University of Technology | Pan Z.,Guangdong University of Technology | And 5 more authors.
Journal of Power Sources | Year: 2016

Titanium cobalt nitride (TiCoN)–CNTs hybrid support is prepared by a facile and efficient method, including a one-pot solvothermal process followed by a nitriding process, and this hybrid support is further decorated with Pt nanoparticles to catalyze the oxidation of methanol. The catalyst is characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and electrochemical measurements. Notably, Pt/CNTs@TiCoN catalyst exhibits a much higher mass activity and durability than that of the conventional Pt/C (JM) for methanol oxidation. The experimental data indicates that the CNTs@TiCoN hybrid support combines the merits of the CNTs's high conductivity and the superb corrosion resistance of external TiCoN coating. © 2016 Elsevier B.V.


Xiao Y.,Guangdong University of Technology | Zhan G.,Guangdong University of Technology | Fu Z.,Guangdong University of Technology | Pan Z.,Guangdong University of Technology | And 5 more authors.
Journal of Power Sources | Year: 2015

Abstract We describe a facile route to the development of novel robust non-carbon titanium cobalt nitride (Ti0.9Co0.1N) used as a support for Pt, and the catalyst exhibits high activity and stability for the oxygen reduction reaction (ORR). XRD and TEM results show that the synthesized Ti0.9Co0.1N is formed as a single-phase solid solution with high purity. The XPS measurements verified the strong metal/support interaction between Pt nanoparticles (NPs) and the Ti0.9Co0.1N support. Most importantly, Ti0.9Co0.1N supported Pt catalyst (Pt/Ti0.9Co0.1N) exhibits a much higher mass activity and durability than that of the commercial JM Pt/C electrocatalyst for ORR. The accelerated durability test (ADT) reveals that the novel Ti0.9Co0.1N support can dramatically enhance the durability of the catalyst and maintain the electrochemical surface area (ECSA) of Pt. Pt/Ti0.9Co0.1N shows great improvement in ECSA preservation, with only 35% of the initial ECSA drop even after 10 000 ADT cycles. The experimental data indicate that the electronic structure of Pt can be modified by Co doping, and there exists a strong interaction between Pt and the Ti0.9Co0.1N support, both of them are playing an important role in improving the activity and durability of the Pt/Ti0.9Co0.1N catalyst. © 2015 Elsevier B.V. All rights reserved.


Xiao Y.,Guangdong University of Technology | Fu Z.,Guangdong University of Technology | Zhan G.,Guangdong University of Technology | Pan Z.,Guangdong University of Technology | And 5 more authors.
Journal of Power Sources | Year: 2015

Titanium molybdenum nitride (Ti0.8Mo0.2N) hybrid support is prepared by a facile and efficient method, including a one-pot solvothermal process followed by a thermal treatment under ammonia at 750 °C, and this hybrid support is further decorated with Pt nanoparticles to catalyze the oxidation of methanol. The catalyst is characterized by X-ray diffraction (XRD), nitrogen adsorption/desorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and electrochemical measurements. XRD and TEM results show that the synthesized Ti0.8Mo0.2N is formed as a single-phase solid solution with high purity. Notable, Ti0.8Mo0.2N supported Pt catalyst exhibits a much higher mass activity and durability than that of the conventional Pt/C (E-TEK) electrocatalysts for methanol electrooxidation. The experimental data indicates that the Mo doping has the bifunctional effect that improves the performance and durability of the supported Pt NPs by inducing both co-catalytic and electronic effects. © 2014 Elsevier B.V. All rights reserved.

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