Electrocatalytic conversion of carbon dioxide to formic acid over nanosized Cu6Sn5 intermetallic compounds with a SnO2 shell layer

被引：17

作者：

Gunji, Takao ^{[1
]}

Ochiai, Hiroya ^{[1
]}

Isawa, Yu ^{[1
]}

Liu, Yubin ^{[1
]}

Nomura, Fumihiro ^{[1
]}

Miyauchi, Masahiro ^{[2
]}

Matsumoto, Futoshi ^{[1
]}

机构：

[1] Kanagawa Univ, Dept Mat & Life Chem, Kanagawa Ku, 3-27-1 Rokkakubashi, Yokohama, Kanagawa 2218686, Japan

[2] Tokyo Inst Technol, Sch Mat & Chem Technol, Dept Mat Sci & Engn, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528552, Japan

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2019年 / 9卷 / 23期

关键词：

ELECTROCHEMICAL REDUCTION; CO2; REDUCTION; TIN ELECTRODES; ELECTROREDUCTION; NANOPARTICLES; SELECTIVITY; EFFICIENCY; CATALYSIS; FORMATE;

D O I：

10.1039/c9cy01540j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A novel ordered intermetallic compound of carbon-black-supported Cu6Sn5 nanoparticles (Cu6Sn5 NP/CB) in which Cu6Sn5 has a NiAs-type structure was successfully prepared through a wet chemical method using lithium triethylborohydride as a reducing agent. The prepared ordered intermetallic compound was characterized using X-ray diffraction (XRD), transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), and X-ray absorption fine structure spectroscopy (XAFS). The XRD measurements confirm the formation of the NiAs-type ordered intermetallic Cu6Sn5. XPS and STEM-X-ray energy dispersive spectroscopy measurements allowed us to confirm the Cu6Sn5 structure. The surface of the intermetallic Cu6Sn5 was found to be covered by SnO2, indicating that a core-shell structured intermetallic compound (i.e., Cu6Sn5 core/SnO2 shell) had formed. The Cu6Sn5 NP/CB material exhibited a faradaic efficiency of 65.3% at -0.6 V for HCOO- formation via electrochemical CO2 reduction, which is superior to those of the non-intermetallic Cu NP/CB and Sn NP/CB samples. From the XAFS measurements, we determined the Sn-Sn distance in the SnO2 on the surface of the Cu6Sn5 NPs, and the key factor affecting the high selectivity was found to be the 4.9% compressive strain of the SnO2 shell layers on the Cu6Sn5 compared to that of the Sn NP/CB sample.

引用

页码：6577 / 6584

页数：8

共 27 条

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