Effect of hydrophobic cations on the oxygen reduction reaction on single-crystal platinum electrodes

被引：90

作者：

Kumeda, Tomoaki ^{[1
]}

Tajiri, Hiroo ^{[2
]}

Sakata, Osami ^{[3
,4
]}

Hoshi, Nagahiro ^{[1
]}

Nakamura, Masashi ^{[1
]}

机构：

[1] Chiba Univ, Grad Sch Engn, Dept Appl Chem & Biotechnol, Inage Ku, Yayoi Cho 1-33, Chiba 2638522, Japan

[2] Japan Synchrotron Radiat Res Inst SPring 8, Res & Utilizat Div, Kouto 1-1-1, Sayo, Hyogo 6795148, Japan

[3] Japan Synchrotron Radiat Res Inst SPring 8, Synchrotron Xray Grp, Kouto 1-1-1, Sayo, Hyogo 6795148, Japan

[4] SPring 8, Synchrotron Xray Stn, Natl Inst Mat Sci, Kouto 1-1-1, Sayo, Hyogo 6795148, Japan

来源：

NATURE COMMUNICATIONS | 2018年 / 9卷

关键词：

ELECTROCHEMICAL DOUBLE-LAYER; X-RAY-DIFFRACTION; INFRARED-SPECTROSCOPY; PT(111) ELECTRODE; SURFACE; WATER; ADSORPTION; IONS; OXIDATION; ELECTROCATALYSTS;

D O I：

10.1038/s41467-018-06917-4

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Highly active catalysts for the oxygen reduction reaction are essential for the widespread and economically viable use of polymer electrolyte fuel cells. Here we report the oxygen reduction reaction activities of single-crystal platinum electrodes in acidic solutions containing tetraalkylammonium cations with different alkyl chain lengths. The high hydrophobicity of a tetraalkylammonium cation with a longer alkyl chain enhances the oxygen reduction reaction activity. The activity on Pt(111) in the presence of tetra-n-hexylammonium cation is eight times as high as that without this cation, which is comparable to the activities on Pt3Co(111) and Pt3Ni(111) electrodes. Hydrophobic cations and their hydration shells destabilize the adsorbed hydroxide and adsorbed water. The hydrophobic characteristics of non-specifically adsorbed cations can prevent the adsorption of poisoning species on the platinum electrode and form a highly efficient interface for the oxygen reduction reaction.

引用

页数：7

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