Electrochemical CO2 Reduction on Bimetallic Surface Alloys: Enhanced Selectivity to CO for Co/Au(110) and to H2 for Sn/Au(110)

被引：11

作者：

Todoroki, Naoto ^{[1
]}

Tei, Hiroki ^{[1
]}

Miyakawa, Taku ^{[1
]}

Tsurumaki, Hiroto ^{[1
]}

Wadayama, Toshimasa ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Environm Studies, Sendai, Miyagi 980857, Japan

来源：

CHEMELECTROCHEM | 2019年 / 6卷 / 12期

基金：

日本学术振兴会;

关键词：

electrochemical CO2 reduction; surface alloy; gold single crystal; online electrochemical mass spectrometry; carbon monoxide; CARBON-DIOXIDE REDUCTION; FORMIC-ACID; ELECTROREDUCTION; COPPER; CONVERSION; GOLD; CATALYSTS; ELECTROCATALYSIS; NANOPARTICLES; SEGREGATION;

D O I：

10.1002/celc.201900725

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We investigated electrochemical CO2 reduction (ECR) on 0.1 monolayer-thick-Co and Sn-deposited Au(110) surfaces (Co/Au(110), and Sn/Au(110)). Scanning tunneling microscopic images showed quasi-one-dimensional Co and Sn islands with different aspect ratios growing along the trenches of the missing-row direction of the (1x2) reconstructed Au(110) surface. The selectivity and partial current density of the CO and H-2 evolutions correlated with those of the deposited metals. CO evolution selectivity of the former Co/Au(110) increased compared with that of the Au(110), while that of the Sn/Au(110) significantly decreased. Co/Au(110) showed 1.4-fold higher CO evolution activity than that of the clean Au(110) at -1.35 V vs. reversible hydrogen electrode. In contrast, the H-2 evolution of the latter surface was significantly enhanced at a potential lower than -0.1 V. The results showed that site separations of Au and alloying elements of Co and Sn at the topmost surface determine the ECR product selectivity of alloy electrodes.

引用

页码：3101 / 3107

页数：7

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