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Bifunctional Nitrogen and Cobalt Codoped Hollow Carbon for Electrochemical Syngas Production.


ABSTRACT: Electrochemical conversion of CO2 and H2O into syngas is an attractive route to utilize green electricity. A competitive system economy demands development of cost-effective electrocatalyst with dual active sites for CO2 reduction reaction (CO2RR) and hydrogen evolution reaction (HER). Here, a single atom electrocatalyst derived from a metal-organic framework is proposed, in which Co single atoms and N functional groups function as atomic CO2RR and HER active sites, respectively. The synthesis method is based on pyrolysis of ZnO@ZIF (zeolitic imidazolate framework). The excess in situ Zn evaporation effectively prevents Co single atoms (?3.4 wt%) from aggregation and maintains appropriate Co/N ratio. The as-prepared electrocatalyst is featured with high graphitic degree of carbon support for rapid electron transport and sponge-like thin carbon shells with hierarchical pore system for facilitating active site exposure and mass transport. Therefore, the electrocatalyst exhibits a nearly 100% Faradic efficiency and a high formation rate of ?425 mmol g-1 h-1 at 1.0 V with the gaseous product ratio (CO/H2) approximating ideal 1/2. With the assistance of an extensive material characterization and density functional theory (DFT) calculations, it is identified that Co single atoms are uniformly coordinated in the form of Co-C2N2 moieties, and act as the major catalytic sites for CO2 reduction.

SUBMITTER: Song X 

PROVIDER: S-EPMC6051375 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature

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Bifunctional Nitrogen and Cobalt Codoped Hollow Carbon for Electrochemical Syngas Production.

Song Xiaokai X   Zhang Hao H   Yang Yuqi Y   Zhang Bin B   Zuo Ming M   Cao Xin X   Sun Jianhua J   Lin Chao C   Li Xiaopeng X   Jiang Zheng Z  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20180507 7


Electrochemical conversion of CO<sub>2</sub> and H<sub>2</sub>O into syngas is an attractive route to utilize green electricity. A competitive system economy demands development of cost-effective electrocatalyst with dual active sites for CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR) and hydrogen evolution reaction (HER). Here, a single atom electrocatalyst derived from a metal-organic framework is proposed, in which Co single atoms and N functional groups function as atomic CO<sub>2</sub  ...[more]

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