Antimony doped tin oxide modified carbon nanotubes as catalyst supports for methanol oxidation and oxygen reduction reactions

Junyuan Xu; David Aili; Qingfeng Li; Chao Pan; Erik Christensen; Jens Oluf Jensen; Wei Zhang; Gaoyang Liu; Xindong Wang; Niels J. Bjerrum

doi:10.1039/C3TA11238A

Antimony doped tin oxide modified carbon nanotubes as catalyst supports for methanol oxidation and oxygen reduction reactions†

Junyuan Xu,^abc David Aili,^c Qingfeng Li,*^c Chao Pan,^c Erik Christensen,^c Jens Oluf Jensen,^c Wei Zhang,^d Gaoyang Liu,^ab Xindong Wang*^ab and Niels J. Bjerrum^c

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* Corresponding authors

^a State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 College Road, Beijing 100083, China
E-mail: echem@ustb.edu.cn
Fax: +86 10 62332651
Tel: +86 10 62332651

^b Department of Physical Chemistry, University of Science and Technology Beijing, 30 College Road, Beijing 100083, China
E-mail: echem@ustb.edu.cn
Fax: +86 10 62332651
Tel: +86 10 62332651

^c Proton Conductors, Department of Energy Conversion and Storage, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs., Lyngby, Denmark
E-mail: qfli@dtu.dk
Fax: +45 45252318
Tel: +45 45252318

^d Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, Roskilde, Denmark

Abstract

Antimony doped tin oxide (ATO) and its composites with carbon nanotubes (CNTs) were synthesized and investigated as alternative Pt catalyst supports for the oxygen reduction reaction (ORR) and the methanol oxidation reaction (MOR). The synthesized ATO nanoparticles had a BET surface area of 88 m² g⁻¹ and an electronic conductivity of 0.75 S cm⁻¹. When loaded on the CNT surface at a content of e.g. 5 wt%, the composite support provided a specific surface area of 243 m² g⁻¹ and an electronic conductivity of 3.9 S cm⁻¹. Uniformly dispersed platinum nanoparticles were prepared with this composite material as the support. Strong interactions between platinum and oxide particles, as evidenced by XPS, led to modification of the electronic structure of platinum, which in turn significantly enhanced the catalytic activity towards both ORR and MOR. The improved catalytic performance for the ORR was confirmed by high temperature proton exchange membrane fuel cell tests.

Journal of Materials Chemistry A

Antimony doped tin oxide modified carbon nanotubes as catalyst supports for methanol oxidation and oxygen reduction reactions†

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Antimony doped tin oxide modified carbon nanotubes as catalyst supports for methanol oxidation and oxygen reduction reactions

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