Study on electrocatalytic performances of Ag/Ag2CO3 wide potential catalysts for CO2 reduction to CO

CHEN Chen; XU Chunguo

doi:10.12434/j.issn.2097-2547.20240148

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Study on electrocatalytic performances of Ag/Ag₂CO₃ wide potential catalysts for CO₂ reduction to CO

- Study on electrocatalytic performances of Ag/Ag₂CO₃ wide potential catalysts for CO₂ reduction to CO
- Vol. 49, Issue 10, Pages: 30-37(2024)
- 作者机构：
  
  1.中石油华东设计院有限公司，山东青岛 266071
  2.中国石油天然气第七建设有限公司，山东青岛 266061
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20240148
  CLC： TQ035
- Published：25 October 2024，
  
  Received：08 April 2024，
  
  Revised：25 May 2024，
- 稿件说明：
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陈晨,许春国.Ag/Ag₂CO₃宽电势催化剂电催化还原CO₂制CO性能研究[J].低碳化学与化工,2024,49(10):30-37.

CHEN Chen,XU Chunguo.Study on electrocatalytic performances of Ag/Ag₂CO₃ wide potential catalysts for CO₂ reduction to CO[J].Low-carbon Chemistry and Chemical Engineering,2024,49(10):30-37.
陈晨,许春国.Ag/Ag₂CO₃宽电势催化剂电催化还原CO₂制CO性能研究[J].低碳化学与化工,2024,49(10):30-37. DOI： 10.12434/j.issn.2097-2547.20240148.

CHEN Chen,XU Chunguo.Study on electrocatalytic performances of Ag/Ag₂CO₃ wide potential catalysts for CO₂ reduction to CO[J].Low-carbon Chemistry and Chemical Engineering,2024,49(10):30-37. DOI： 10.12434/j.issn.2097-2547.20240148.

摘要

电催化二氧化碳还原反应（CO

RR）催化剂面临稳定性差和选择性低等挑战，开发高性能、宽电势CO

RR催化剂成为研究热点。采用原位制备法，在伏安线性扫描过程中，反应诱导银箔基底与KHCO

电解液原位生成催化剂I-Ag/Ag

。采用XRD、XPS、Raman、SEM和TEM等对I-Ag/Ag

进行了表征，并考察了其在H型电解池中电催化性能。结果表明，I-Ag/Ag

在宽电势（-0.78~-1.78 V）范围内表现出高效的CO

还原制CO催化性能，该催化剂的CO部分电流密度最高可达53 mA/cm

。该催化剂在1 V的宽电势区间内CO法拉第效率（

）高于80%，在-1.18 V（参比电极为可逆氢电极，下同）电势下

最大值为96%，并能够在-1.0 V、20 h内不低于90%。通过构-效关系分析可知，通过原位制备法获得的I-Ag/Ag

上Ag和Ag

之间形成了特殊异质结构，减小了电子转移至CO

的阻力，提高了CO

RR过程速控步骤的反应速率。

Abstract

Electrocatalytic carbon dioxide reduction reaction (CO

RR) faces challenges of poor stability and low selectivity

and the development of high-performance CO

RR catalysts with a wide potential range has become a research hotspot. An in situ preparation method was adopted

where CO

RR catalyst I-Ag/Ag

was formed in situ on a silver foil substrate during linear sweep voltammetry in a KHCO

electrolyte. I-Ag/Ag

was characterized by XRD

XPS

Raman

SEM and TEM. The electrocatalytic performance of I-Ag/Ag

was investigated in an H-type electrolytic cell. The results show that I-Ag/Ag

exhibits efficient catalytic performance for CO

reduction to CO in a wide potential range (from -0.

78 V to -1.78 V). The maximum CO partial current density of the catalyst is up to 53 mA/cm

and the CO Faradaic efficiency (

) of the catalyst is higher than 80% in a wide potential range of 1 V

and the maximum

is 96% at -1.18 V (the reference electrode is a reversible hydrogen electrode

the same below) and can maintain no less than 90% within 20 h at -1.0 V. Through structure-performance relationship analysis

it is revealed that the special heterostructure formed between Ag and Ag

on I-Ag/Ag

obtained via the in situ preparation method. The special heterostructure reduces the resistance of electron transfer to CO

and enhances the rate of the rate-determining step of CO

RR process.

关键词

Ag/Ag2CO3电催化还原CO2CO宽电势催化剂

Keywords

Ag/Ag2CO3electroreductionCO2COwide potential catalysts

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