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Mixed Copper States in Anodized Cu Electrocatalyst for Stable and Selective Ethylene Production from CO2 Reduction
journal contribution
posted on 2018-06-18, 00:00 authored by Si Young Lee, Hyejin Jung, Nak-Kyoon Kim, Hyung-Suk Oh, Byoung Koun Min, Yun Jeong HwangOxygen–Cu
(O–Cu) combination catalysts have recently
achieved highly improved selectivity for ethylene production from
the electrochemical CO2 reduction reaction (CO2RR). In this study, we developed anodized copper (AN-Cu) Cu(OH)2 catalysts by a simple electrochemical synthesis method and
achieved ∼40% Faradaic efficiency for ethylene production,
and high stability over 40 h. Notably, the initial reduction conditions
applied to AN-Cu were critical to achieving selective and stable ethylene
production activity from the CO2RR, as the initial reduction
condition affects the structures and chemical states, crucial for
highly selective and stable ethylene production over methane. A highly
negative reduction potential produced a catalyst maintaining long-term
stability for the selective production of ethylene over methane, and
a small amount of Cu(OH)2 was still observed on the catalyst
surface. Meanwhile, when a mild reduction condition was applied to
the AN-Cu, the Cu(OH)2 crystal structure and mixed states
disappeared on the catalyst, becoming more favorable to methane production
after few hours. These results show the selectivity of ethylene to
methane in O–Cu combination catalysts is influenced by the
electrochemical reduction environment related to the mixed valences.
This will provide new strategies to improve durability of O–Cu
combination catalysts for C–C coupling products from electrochemical
CO2 conversion.
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Keywords
electrochemical reduction environmentreduction conditionethylene production activityAN-CuSelective Ethylene Productionelectrochemical CO 2 reduction reactionAnodized Cu ElectrocatalystMixed Copper StatescombinationCO 2 RRelectrochemical synthesis methodethylene productionelectrochemical CO 2 conversion