Highly Efficient, Selective, and Stable CO2 Electroreduction on a Hexagonal Zn Catalyst

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Electrocatalytic CO2 conversion into fuel is a prospective strategy for the sustainable energy production. However, still many parts of the catalyst such as low catalytic activity, selectivity, and stability are challenging. Herein, a hierarchical hexagonal Zn catalyst showed highly efficient and, more importantly, stable performance as an electrocatalyst for selectively producing CO. Moreover, we found that its high selectivity for CO is attributed to morphology. In electrochemical analysis, Zn (101) facet is favorable to CO formation whereas Zn (002) facet favors the H-2 evolution during CO2 electrolysis. Indeed, DFT calculations showed that (101) facet lowers a reduction potential for CO2 to CO by more effectively stabilizing a center dot COOH intermediate than (002) facet. This further suggests that tuning the crystal structure to control (101)/(002) facet ratio of Zn can be considered as a key design principle to achieve a desirable product from Zn catalyst.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2016-08
Language
English
Article Type
Article
Keywords

ELECTROCHEMICAL REDUCTION; CARBON-DIOXIDE; ELECTROCATALYTIC REDUCTION; AU NANOPARTICLES; CONVERSION; ELECTRODES; CU; SURFACES; INSIGHTS; HALIDES

Citation

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.55, no.32, pp.9297 - 9300

ISSN
1433-7851
DOI
10.1002/anie.201602888
URI
http://hdl.handle.net/10203/212350
Appears in Collection
EEW-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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