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Developing a Wattecs Parallel Autoclave System Synthesis Technique for Tailoring Surface Compositions and Valence States of Pt-Fe Alloys to Realize Bifunctional Electrocatalysis

Abstract

The development of bifunctional electrocatalysts for both methanol oxidation reaction (MOR) on the anode and oxygen reduction reaction (ORR) on the cathode is urgently demanded for promoting the electrochemical energy conversion and lowering the fuel cell cost. The surface electron configuration correlated to the surface elemental composition and the valence state of an electrocatalyst play crucial roles for realizing the bifunctionality and efficient electrocatalysis. In this paper, we demonstrated the achievement of bifunctional Pt-Fe alloy electrocatalysts for effectively catalyzing both MOR and ORR through tailoring their surface electron configuration via a synthetic strategy employing a Wattecs Parallel Autoclave System (WPAS), which allows the alternation of reaction atmosphere and operation condition during the synthetic process in comparison with normal hydrothermal method. The optimal Pt-Fe alloy electrocatalyst presents a remarkable enhanced ORR electrocatalytic performance with a half-potential (E1/2) of 0.9 V (vs. Ag/AgCl), along with a robust stability (3000 cycles) for the ORR in 0.1 M HClO4 solution, and exhibit an excellent catalytic performance for the MOR with a mass activity of 1.82 A mg-1, which is 7.9 times higher than that of commercial 20 % Pt/C (0.23 A mg-1). Such Pt-Fe alloy electrocatalysts also possess the long-term stability and the tolerant ability to CO intermediates, representing the great significance for widespread applications in the renewable energy field due to their lower cost and superior bifunctionality for both the MOR and ORR. The variability of surface electron configuration arisen from the purposive modulation of chemical composition and valence state on the surface of Pt-Fe alloy electrocatalysts account for the promotion of electrocatalytic performance and the realization of bifunctional catalysis for both MOR and ORR.

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Publication details

The article was received on 08 Sep 2017, accepted on 02 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7CE01612C
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Developing a Wattecs Parallel Autoclave System Synthesis Technique for Tailoring Surface Compositions and Valence States of Pt-Fe Alloys to Realize Bifunctional Electrocatalysis

    G. Xu, J. Liu, B. Liu, X. Gong, S. Wang, Q. Wang and J. Zhang, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01612C

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