Carbon-Coated and Interfacial-Functionalized Mixed-Phase Mox Ti1-x O2-δ Nanotubes as Highly Active and Durable PtRu Catalyst Support for Methanol Electrooxidation

Jia-Long Li; Lei Zhao; Xi-Fei Li; Su-E Hao; Zhen-Bo Wang

doi:10.1002/asia.201900264

Carbon-Coated and Interfacial-Functionalized Mixed-Phase Mo_x Ti_1-x O_2-δ Nanotubes as Highly Active and Durable PtRu Catalyst Support for Methanol Electrooxidation

Chem Asian J. 2019 May 2;14(9):1549-1556. doi: 10.1002/asia.201900264. Epub 2019 Mar 29.

Authors

Jia-Long Li¹, Lei Zhao¹, Xi-Fei Li², Su-E Hao¹, Zhen-Bo Wang¹

Affiliations

¹ MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
² Institute of Advanced Electrochemical Energy, School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, 710048, China.

PMID: 30924601
DOI: 10.1002/asia.201900264

Abstract

A synchronous carbon-coating and interfacial-functionalizing approach is proposed for the fabrication of Mo-doped Mo_x Ti_1-x O_2-δ nanotubes (C@IF-MTNTs) under mild hydrothermal reaction with subsequent annealing as advanced catalyst supports for PtRu nanoparticles (NPs) towards methanol electrooxidation. The carbonation of glucose and Mo-doping takes place simultaneously at the interface of pristine anatase TiO₂ nanotubes (TNTs), generating a unique concentric multilayered one-dimensional (1D) structure with crystalline an anatase/rutile mixed-phase TiO₂ core and Mo-functionalized interface and subsequently a carbon shell. The obtained PtRu/C@IF-MTNTs catalyst exhibits an over 2 times higher mass activity with comparable durability than that of the unmodified PtRu/C@TNTs catalyst and over 1.7 times higher mass activity with over 20 % higher stability than that of PtRu/C catalyst. Such superior catalytic performance towards methanol electrooxidation is ascribed to the Mo-functionalized interface, concentric multilayered 1D architecture, and anatase/rutile mixed-phase core, which facilitates the charge transport through 1D structural support and electronic interaction between C@IF-MTNTs and ultrafine PtRu NPs. This work reveals the critical application of a 1D interfacial functionalized architecture for advanced energy storage and conversion.

Keywords: core-shell structures; doping; fuel cells; interface functionalization; nanotubes.

Abstract

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