期刊
SMALL
卷 17, 期 35, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202100683
关键词
carbon dioxide reduction reaction; electrocatalysts; hybrid electrodes; intermetallic compounds; nanoporous metals
类别
资金
- National Natural Science Foundation of China [51871107, 51631004]
- Top-notch Young Talent Program of China [W02070051]
- Chang Jiang Scholar Program of China [Q2016064]
- Fundamental Research Funds for the Central Universities
- Program for Innovative Research Team (in Science and Technology) in University of Jilin Province
- Program for JLU Science and Technology Innovative Research Team (JLUSTIRT) [2017TD-09]
The authors report a robust electrocatalyst, intermetallic Cu3Sn, seamlessly integrated on a self-supported bimodal nanoporous Cu skeleton for selective electroreduction of CO2 to CO. The nanoporous Cu3Sn/Cu hybrid electrodes exhibit low overpotential, high partial current density, excellent stability, and selectivity, making them attractive alternatives to precious metal-based electrocatalysts for CO2 reduction.
Designing highly selective and cost-effective electrocatalysts toward electrochemical carbon dioxide (CO2) reduction is crucial for desirable transformation of greenhouse gas into fuels or high-value chemical products. Here, the authors report intermetallic Cu3Sn that is in situ formed and seamlessly integrated on self-supported bimodal nanoporous Cu skeleton (Cu3Sn/Cu) via a spontaneous alloying of Sn and Cu as robust electrocatalyst for selective electroreduction of CO2 to CO. By virtue of Sn atoms strengthening CO adsorption on Cu atoms, the intermetallic Cu3Sn has an intrinsic activity of approximate to 10.58 mu A cm(-2), more than 80-fold higher than that of monometallic Cu. By virtue of hierarchical bicontinuous nanoporous Cu architecture facilitating electron transfer and CO2 and proton mass transport and offering high specific surface areas for full use of electroactive Cu3Sn sites, the nanoporous Cu3Sn/Cu hybrid electrodes produce CO at a low overpotential of 0.09 V, and exhibit high partial current density of approximate to 15 mA cm(geo)(-2) at overpotential of 0.59 V, along with excellent stability and selectivity of 91.5% Faradaic efficiency. The outstanding electrochemical performance make them attractive alternatives to precious Au- and Ag-based electrocatalysts for building low-cost CO2 electrolyzers to selectively produce CO.
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