Understanding Selective Reduction of CO2 to CO on Modified Carbon Electrocatalysts

被引：20

作者：

Jung, Hyejin ^{[1
,2
]}

Lee, Si Young ^{[1
,2
]}

Won, Da Hye ^{[1
]}

Kim, Ki-Jeong ^{[3
]}

Chae, Sang Youn ^{[1
]}

Oh, Hyung-Suk ^{[1
]}

Min, Byoung Koun ^{[1
,4
]}

Hwang, Yun Jeong ^{[1
,2
]}

机构：

[1] Korea Inst Sci & Technol, Clean Energy Res Ctr, 5,Hwarang Ro 14 Gil, Seoul 02792, South Korea

[2] Korea Univ Sci & Technol, KIST Sch, Div Energy & Environm Technol, Seoul 02792, South Korea

[3] Pohang Accelerator Lab, Beamline Res Div, Pohang 37673, South Korea

[4] Korea Univ, Green Sch, 145 Anam Ro, Seoul 02841, South Korea

来源：

CHEMELECTROCHEM | 2018年 / 5卷 / 12期

基金：

新加坡国家研究基金会;

关键词：

CO2; reduction; electrochemistry; doped carbon; materials science; selective CO production; OXYGEN REDUCTION; ELECTROCHEMICAL REDUCTION; DIOXIDE ELECTROREDUCTION; NANOTUBE ARRAYS; PERFORMANCE; CONVERSION; CATALYSIS; SITES; POLYANILINE; ELECTRODES;

D O I：

10.1002/celc.201701337

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Modified carbon powders are attractive electrocatalysts for chemical conversion due to their low cost and high activity. Here, we demonstrate that electrochemical conversion activities of CO2 to CO in aqueous media are enhanced by the incorporation of transition metals into nitrogen-doped carbon (M-N/C; M=Fe, Co, Cu). The type of the metals is thereby critical to achieve selective CO production over H-2. Among M-N/C and N/C catalysts, Fe-N/C exhibited the highest faradaic efficiency for CO conversion, significantly enhanced compared with the metal-free N-doped carbon electrocatalyst. In addition, the catalysts containing higher pyridinic N and graphitic N but lower pyrrolic N contents favor CO production at lower bias potentials. Meanwhile, the total amount of N content in the carbon material is less important. Our CO2 reduction reaction results combined with X-ray photoelectron spectroscopy analysis propose that the modification of nitrogen states in the carbon structure is crucial in CO2RR activity.

引用

页码：1615 / 1621

页数：7

共 41 条

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