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Journal of Chemistry
Volume 2019, Article ID 6842849, 13 pages
https://doi.org/10.1155/2019/6842849
Research Article

Enhancing Activity of Pd-Based/rGO Catalysts by Al-Si-Na Addition in Ethanol Electrooxidation in Alkaline Medium

Key Laboratory for Petrochemical and Refinery Technologies, No. 2, Pham Ngu Lao Street, Hoan Kiem District, Hanoi 100000, Vietnam

Correspondence should be addressed to Minh Dang Nguyen; moc.liamg@31.kb.dh.dmn and Thu Ha Thi Vu; rf.oohay@4002dtntp

Received 21 February 2019; Revised 30 May 2019; Accepted 12 June 2019; Published 23 June 2019

Guest Editor: Thanh-Dong Pham

Copyright © 2019 Minh Dang Nguyen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The article presents modified Pd-based catalysts supported on reduced graphene oxide (rGO), used in the electrooxidation reaction of ethanol in alkaline medium. When NaBH4 reducing agent was used, the random presence of Na was found out. According to this result, Na was used as a promoter of Pd-based catalyst. Consequently, the Al-Si-Na addition not only assisted active phase Pd nanoparticles to disperse homogenously on graphene surport, but also contributed to increase catalytic activity in the reaction. This value, 16138 mA·mg−1Pd, is about 1.5 times higer than that of the catalyst modified by Al-Si. Moreover, the stability of the catalyst is enhanced more. The electrochemical stability of PASGN.N catalyst was relatively good: after 500 scanning cycles, the current density diminished 32% compared with the highest peak current density of the 15th cycle, which was chosen as a reference. These significant improvement results in electrooxidation of ethanol have opened up the high potential application of these catalysts in direct-ethanol fuel cell.