1 research outputs found
Electrochemical Reduction of CO<sub>2</sub> into Tunable Syngas Production by Regulating the Crystal Facets of Earth-Abundant Zn Catalyst
The
electrochemical reduction of CO<sub>2</sub> to syngas with a tunable
CO/H<sub>2</sub> ratio is regarded as an economical and promising
method for the future. Herein, a series of earth-abundant Zn catalysts
with different crystal facet ratios of Zn(002) to Zn(101) in the bulk
phase have been prepared on electrochemically polished Cu foam by
the electrochemical deposition method. The Zn catalyst with more (101)
crystal facets show good electrochemical activity for the CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR) to CO and that with more (002)
crystal facets favor the hydrogen evolution reaction. The linear relationship
between the crystal facet ratio of Zn(101) to Zn(002) and the Faradaic
efficiency (FE) of CO<sub>2</sub>RR to CO has been revealed for the
first time. The prepared catalyst with more (101) facets show greater
than 85% FE to syngas at −0.9 V (vs reversible hydrogen electrode)
in aqueous electrolyte, with tunable CO/H<sub>2</sub> ratios ranging
from 0.2 to 2.31 that can be used in existing industrial systems.
Meanwhile, the mechanism of electroreduction of CO<sub>2</sub> on
the Zn electrode has been studied by in situ infrared absorption spectroscopy.
The highly selective role of the Zn(101) crystal facet in the CO<sub>2</sub>RR to CO has been evidenced by density functional theory calculations