Journal
NANOSCALE
Volume 12, Issue 2, Pages 772-784Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr08726e
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Funding
- National Natural Science Foundation of China [21671142, 21875150]
- Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars [BK20160006]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Project of Scientific and Technologic Infrastructure of Suzhou [SZS201905]
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The direct electroreduction of CO2 to ratio-tunable syngas (CO + H-2) is an appealing solution to provide important feedstocks for many industrial processes. However, low-cost, Earth-abundant yet efficient and stable electrocatalysts for composition-adjustable syngas have still not been realized for practical applications. Herein, new hierarchical 0D/2D heterostructures of SnO2 nanoparticles (NPs) confined on CuS nanosheets (NSs) were designed to enable CO2 electroreduction to a wide-range syngas (CO/H-2: 0.11-3.86) with high faradaic efficiency (>85%), remarkable turnover frequency (96.12 h(-1)) and excellent durability (over 24 h). Detailed experimental characterization studies together with theoretical calculations manifest that the ascendant catalytic performance is not only attributed to the heterostructure of ultrasmall SnO2 NPs homogeneously confined on ultrathin CuS NSs, which endows the maximum exposure of active sites and faster charge transfer, but is also accounted by the strong interaction between well-defined SnO2 and CuS interfaces, which modulated reaction free-energies of reaction intermediates and hence improved the activity of CO2 electroreduction to highly ratio-tunable syngas. This work provides a better understanding and a new strategy for intermediate regulation by interface engineering of hereostructures for CO2 reduction and beyond.
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