Antipoisoning Nickel-Carbon Electrocatalyst for Practical Electrochemical CO2 Reduction to CO
Date
2019
Authors
Daiyan, Rahman
Lu, Xunyu
Tan, Xin
Zhu, Xiaofeng
Chen, Rui
Smith, Sean
Amal, Rose
Journal Title
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Volume Title
Publisher
American Chemical Society
Abstract
The feasibility of utilizing electrochemical reduction of CO2
(CO2RR) to close the global carbon cycle is hindered by the absence of
practical electrocatalysts that can be adopted in large CO2 emitting sources with
impurities. To address this, we use density functional theory (DFT) calculations
to design a strategy to develop Ni coordinated graphitic carbon shells (referred as
Ni@NC-900) catalyst. This strategy not only prolongs stability and endows
antipoisoning properties of the catalyst but also reforms the electronic structure
of the outer graphitic carbon shell to make it active for CO2RR. As a result, Ni@
NC-900 demonstrates a high conversion of CO2 to CO with a Faradaic efficiency
(FECO) of 96% and a partial current density for CO (jCO) of ∼−17 mA cm−2 at
an applied potential of −1 V versus reversible hydrogen electrode (RHE). This
activity can be further scaled up to attain a jCO of ∼30 mA cm−2 for 18 h at a cell
voltage of 2.6 V in a high-throughput continuous gas diffusion electrode
(GDE) system. In addition to exhibiting high activity and stability, Ni@NC-900 displays exceptional tolerance toward
impurities (from SOx, NOx, CN−), highlighting the suitability of these rationally designed catalysts for large-scale application in
fossil-fuel based power plants
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Keywords
nickel nanoparticles, graphitic carbon shell, antipoisoning, CO2 reduction, gas diffusion electrode, high-throughput
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Source
ACS Applied Energy Materials
Type
Journal article
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2037-12-31
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