期刊
ADVANCED ENERGY MATERIALS
卷 12, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202200195
关键词
CH; (4); CO; (2) reduction reaction; Cu-Cu distance; CuGaO; (2) nanosheets; single-interlayered copper edge
类别
资金
- National Key Research and Development Program of China [2018YFA0209401, 2017YFA0206901]
- National Natural Science Foundation of China [22025502, 21975051, U1904195]
- Science and Technology Commission of Shanghai Municipality [21DZ1206800, 19XD1420400]
- Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-07-E00045]
- NSERC
- CRC
- CFI
- Western University
In this study, ultrathin CuGaO2 nanosheets with highly exposed single-interlayered Cu edges were synthesized, and they exhibited excellent CO2 electroreduction catalytic activity towards CH4. The results suggest a design strategy for promoting CH4 electrosynthesis by tuning both the crystal facets and Cu-Cu distance.
The electrochemical CO2 reduction to CH4 is a promising approach for producing highly specific combustion fuel but has relatively poor selectivity and activity at high-current-density electrolysis. In this work, ultrathin CuGaO2 nanosheets with highly exposed single-interlayered Cu edges are synthesized via an induced anisotropic growth strategy. Density functional theory calculations indicate that the exposed single-interlayered Cu(I) edges on the (001) surface of CuGaO2 present a high-density of single-atomic Cu sites, which feature excellent CO2 electroreduction catalytic activity toward CH4. The CuGaO2 nanosheet catalysts exhibit efficient and stable CO2-to-CH4 electroreduction with Faradaic efficiency (FECH4) of 71.7% at a high current density of -1 A cm(-2), corresponding to a superior CH4 partial current density of 717 +/- 33 mA cm(-2). This work suggests an attractive design strategy for tuning both the crystal facets and Cu-Cu distance to promote the CH4 electrosynthesis at high-current-density CO2 reduction.
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