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Facile route to achieve bifunctional electrocatalysts for oxygen reduction and evolution reactions derived from CeO2 encapsulated by the zeolitic imidazolate framework-67

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Abstract

Highly efficient bifunctional electrocatalysts for both the oxygen reduction reaction and oxygen evolution reaction are essential for the development of rechargeable metal–air batteries. Herein, we demonstrate a novel bifunctional electrocatalyst with CeO2 and Co nanoparticles being embedded in N-doped carbon, which is achieved via pyrolyzing CeO2@zeolitic imidazolate framework-67 particles. In 0.1 M KOH aqueous solution, CeO2/Co@N-doped carbon shows an excellent electrocatalytic performance with an oxygen reduction reaction onset potential of 0.998 V vs. a reversible hydrogen electrode with an oxygen evolution reaction overpotential of 474 mV at 10 mA cm−2. The liquid rechargeable Zn–air battery that is assembled by using CeO2/Co@N-doped carbon as the air cathode shows excellent charge/discharge performance, with an open-circuit potential of 1.42 V and a maximum power density of 102.69 mW cm−2. Furthermore, the rechargeable Zn–air battery exhibits stable cycling performance at a constant current density of 5 mA cm−2 after 70 hours, with a charge/discharge gap of only 0.8 V and round-trip efficiency of ca. 59%. The remarkable bifunctional properties are considered to arise from the synergistic effect between the N-doped carbon and CeO2 nanoparticles, where abundant Ce3+ and oxygen vacancies in CeO2 are generated and more defect sites are available in N-doped carbon.

Graphical abstract: Facile route to achieve bifunctional electrocatalysts for oxygen reduction and evolution reactions derived from CeO2 encapsulated by the zeolitic imidazolate framework-67

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Publication details

The article was received on 14 Aug 2019, accepted on 21 Sep 2019 and first published on 24 Sep 2019


Article type: Research Article
DOI: 10.1039/C9QI01025D
Inorg. Chem. Front., 2019, Advance Article

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    Facile route to achieve bifunctional electrocatalysts for oxygen reduction and evolution reactions derived from CeO2 encapsulated by the zeolitic imidazolate framework-67

    Y. Yu, X. Peng, U. Ali, X. Liu, Y. Xing and S. Xing, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QI01025D

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