作者
Ram Manohar Yadav, Zhengyuan Li, Tianyu Zhang, Onur Sahin, Soumyabrata Roy, Guanhui Gao, Huazhang Guo, Robert Vajtai, Liang Wang, Pulickel M Ajayan, Jingjie Wu
发表日期
2022/1
期刊
Advanced Materials
卷号
34
期号
2
页码范围
2105690
简介
The electrochemical conversion of carbon dioxide (CO2) to methane (CH4), which can be used not only as fuel but also as a hydrogen carrier, has drawn great attention for use in supporting carbon capture and utilization. The design of active and selective electrocatalysts with exceptional CO2‐to‐CH4 conversion efficiency is highly desirable; however, it remains a challenge. Here a molecular tuning strategy−in situ amine functionalization of nitrogen‐doped graphene quantum dots (GQDs) for highly efficient CO2‐to‐CH4 conversion is presented. Amine functionalized nitrogen‐doped GQDs achieve a CH4 Faradic efficiency (FE) of 63% and 46%, respectively, at CH4 partial current densities of 170 and 258 mA cm−2, approximating to or even outperforming state‐of‐the‐art Cu‐based electrocatalysts. These GQDs also convert CO2 to C2 products mainly including C2H4 and C2H5OH with a maximum FE of ≈10%. A …
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RM Yadav, Z Li, T Zhang, O Sahin, S Roy, G Gao… - Advanced Materials, 2022