Issue 35, 2013
From the journal:

RSC Advances

Origin of the enhancement of electrocatalytic activity and durability of PtRu alloy prepared from a hetero bi-nuclear Pt–Ru complex for methanol oxidation reactions†

Yukihisa Okawa,ab   Takuya Masuda,b   Hiromitsu Uehara,c   Daiju Matsumura,d   Kazuhisa Tamura,d   Yasuo Nishihatad  and  Kohei Uosaki*abce  

* Corresponding authors

a Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan

b Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan

c Graduate School of Science, Division of Chemistry, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan

d Quantum Beam Science Directorate, Japan Atomic Energy Agency (JAEA), Sayo, Hyogo 679-5148, Japan

e International Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
E-mail: UOSAKI.Kohei@nims.go.jp
Fax: +81-29-851-3362
Tel: +81-29-860-4301

Abstract

PtRu alloy, prepared by pyrolysis of hetero bi-nuclear Pt–Ru complexes, showed a higher electrocatalytic activity and durability in the methanol oxidation reaction (MOR) than PtRu alloy prepared by pyrolysis of a mixture of K2PtCl4 and RuCl3. The origin of this activity enhancement was investigated by XPS and Ru K edge XAFS measurements. Although both alloys were composed of metallic Pt and RuO2, the RuO2 in the PtRu alloy prepared from the Pt–Ru complex had greater oxygen deficiency than that in the PtRu alloy prepared from the mixture of K2PtCl4 and RuCl3. XAFS measurements showed that the Ru–O distance of the former was longer than that of the latter, suggesting the presence of the weakly coordinated oxygen species, i.e., H2O, in the PtRu alloy prepared from the Pt–Ru complex. The H2O coordinated to Ru can become an active oxidant, i.e., surface Ru–OH, under electrochemical conditions and enhance MOR activity and durability.

Graphical abstract: Origin of the enhancement of electrocatalytic activity and durability of PtRu alloy prepared from a hetero bi-nuclear Pt–Ru complex for methanol oxidation reactions

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Article information

DOI
https://doi.org/10.1039/C3RA42816H
Article type
Paper
Submitted
07 Jun 2013
Accepted
14 Jun 2013
First published
17 Jun 2013

RSC Adv., 2013,3, 15094-15101

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Origin of the enhancement of electrocatalytic activity and durability of PtRu alloy prepared from a hetero bi-nuclear Pt–Ru complex for methanol oxidation reactions

Y. Okawa, T. Masuda, H. Uehara, D. Matsumura, K. Tamura, Y. Nishihata and K. Uosaki, RSC Adv., 2013, 3, 15094 DOI: 10.1039/C3RA42816H

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