Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 11, Pages 13261-13270Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c23662
Keywords
surface reconstruction; antioxidation ability; sandwich-like structure; Cu nanosheet; carbon layer
Funding
- National Natural Science Foundation of China [21575016, U20A20154]
- National Program for Support of Top-notch Young Professionals
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This study presents a catalyst model with a sandwich-like structure that effectively inhibits surface reconstruction under highly reducing conditions, leading to improved efficiency and selectivity in the electroreduction of carbon dioxide.
For the steady electroreduction of carbon dioxide (CO2RR) to value-added chemicals with high efficiency, the uncontrollable surface reconstruction under highly reducing conditions is a critical issue in electrocatalyst design. Herein, we construct a catalyst model with a sandwich-like structure composed of highly reactive metallic Cu nanosheet that is confined in thin carbon layers (denoted as C/Cu/C nanosheet). The sandwich-like C/Cu/C nanosheet avoids the oxidation of the active site of metallic Cu at an ambient atmosphere owing to the protective coating of the carbon layer, which inhibits the surface reconstruction that occurs via the dissolution of copper oxides and redeposition of dissolved Cu ions. The as-prepared C/Cu/C nanosheet exhibits a prominent Faradaic efficiency (FE) of 47.8% for CH4 products at -1.0 V with a current density of 20.3 mA.cm(-2) and stable production of CH4 during 12 h operation with negligible selectivity loss. Our findings provide an effective strategy of restraining surface reconstruction for the design of selective and stable electrocatalysts toward CO2RR.
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