Cumulative effect of bimetallic alloy, conductive polymer and graphene toward electrooxidation of methanol: An efficient anode catalyst for direct methanol fuel cells

Ravi Arukula, Vinothkannan Mohanraj, Ae Rhan Kim, Dong Jin Yoo

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)

Abstract

In this article, we report a wet reflux strategy for the synthesis of reduced graphene oxide (rGO)/polyaniline (PANI)/Pt-Pd composite, which was exploited as a potential anode catalyst with enhanced methanol oxidation capacity for direct methanol fuel cells (DMFCs). The construction of rGO/PANI/Pt-Pd involves two steps such as synthesis of PANI on GO and in-situ reduction of GO and metal precursors. The spherical shaped Pt-Pd particles with the average size of 3.5 nm are scattered throughout the surface of rGO/PANI, as observed from transmission electron microscope (TEM). PANI tailors the surface of rGO to allow the uniform scattering of Pt-Pd, which is beneficial for adsorption and decomposition of methanol. Besides, PANI generates strong interaction with Pt-Pd through nitride bond, thereby enhances the durability of composite. The cumulative features of rGO/PANI/Pt-Pd include active carbon support, extended architecture of electron conducting channels and number of methanol oxidation centers endows excellent DMFC power density of 117.45 mW/cm2 and concrete cell durability over 70 h. Therefore, the proposed rGO/PANI/Pt-Pd can be used to address various critical issues associated with commercial Pt/C catalyst.
Original languageEnglish
Pages (from-to)477-488
Number of pages12
JournalJournal of Alloys and Compounds
Volume771
Early online date30 Aug 2018
DOIs
Publication statusPublished - 15 Jan 2019
Externally publishedYes

Bibliographical note

© 2018 Elsevier B.V. All rights reserved.

Funder

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea (No. 20184030202210). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (No. 2017R1A2B4005230).

Keywords

  • Pt-Pd
  • rGO
  • PANI
  • Electrooxidation
  • DMFC

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