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    Low Overpotential and High Current CO2 Reduction with Surface Reconstructed Cu Foam Electrodess

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    Type
    Article
    Authors
    Min, Shixiong cc
    Yang, Xiulin cc
    Lu, Ang-Yu
    Tseng, Chien-Chih cc
    Hedhili, Mohamed N. cc
    Li, Lain-Jong cc
    Huang, Kuo-Wei cc
    KAUST Department
    Chemical Science Program
    Homogeneous Catalysis Laboratory (HCL)
    KAUST Catalysis Center (KCC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Surface Science
    Date
    2016-06-25
    Online Publication Date
    2016-06-25
    Print Publication Date
    2016-09
    Permanent link to this record
    http://hdl.handle.net/10754/614803
    
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    Abstract
    While recent reports have demonstrated that oxide-derived Cu-based electrodes exhibit high selectivity for CO2 reduction at low overpotential, the low catalytic current density (<2 mA/cm2 at -0.45 V vs. RHE) still largely limits its applications for large-scale fuel synthesis. Here we report an extremely high current density for CO2 reduction at low overpotential using a Cu foam electrode prepared by air-oxidation and subsequent electroreduction. Apart from possessing three-dimensional (3D) open frameworks, the resulting Cu foam electrodes prepared at higher temperatures exhibit enhanced electrochemically active surface area and distinct surface structures. In particular, the Cu foam electrode prepared at 500 °C exhibits an extremely high geometric current density of ~9.4 mA/cm2 in CO2-satrurated 0.1 M KHCO3 aqueous solution and achieving ~39% CO and ~23% HCOOH Faradaic efficiencies at -0.45 V vs. RHE. The high activity and significant selectivity enhancement are attributable to the formation of abundant grain-boundary supported active sites and preferable (100) and (111) facets as a result of reconstruction of Cu surface facets. This work demonstrates that the structural integration of Cu foam with open 3D frameworks and the favorable surface structures is a promising strategy to develop an advanced Cu electrocatalyst that can operate at high current density and low overpotential for CO2 reduction.
    Citation
    Low Overpotential and High Current CO2 Reduction with Surface Reconstructed Cu Foam Electrodess 2016 Nano Energy
    Sponsors
    We are grateful for the support from King Abdullah University of Science and Technology (KAUST) and the National Natural Science Foundation of China (grant no. 21463001).
    Publisher
    Elsevier BV
    Journal
    Nano Energy
    DOI
    10.1016/j.nanoen.2016.06.043
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S2211285516302269
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.nanoen.2016.06.043
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Catalysis Center (KCC)

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