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Issue 6, 2019
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An all-nanosheet OER/ORR bifunctional electrocatalyst for both aprotic and aqueous Li–O2 batteries

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Abstract

Rechargeable lithium–oxygen (Li–O2) batteries are receiving intense interest because of their high energy density. A highly efficient catalyst for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is a key factor influencing the performance of Li–O2 batteries. In this work, a facile synthesis of an all-nanosheet architecture electrocatalyst constructed from a monolayer ruthenium dioxide (RuO2) nanosheet with a nitrogen doped sulfonated graphene nanosheet (RuO2-NS-GNS) has been developed for Li–O2 batteries. This complex catalyst displays excellent activity towards the ORR and OER in both aprotic and aqueous Li–O2 batteries. A low overpotential around 1.0 V during the discharge/recharge process is obtained for the aprotic Li–O2 battery with RuO2-NS-GNS. Meanwhile, linear sweep voltammetry curves show that the OER and ORR potentials are 1.45 V and 0.81 V in an alkaline solution (1 M LiOH–5 M LiNO3) for RuO2-NS-GNS, respectively. Both aprotic and aqueous Li–O2 batteries with RuO2-NS-GNS exhibit stable cyclability and low round-trip overpotential without obvious degradation at a limited specific capacity of 1000 mA g−1. The advanced electrochemical performance of RuO2-NS-GNS in both aprotic and aqueous Li–O2 batteries can be attributed to the increased catalytic sites and synergistic effect arising from RuO2 and NS-GNS nanosheets.

Graphical abstract: An all-nanosheet OER/ORR bifunctional electrocatalyst for both aprotic and aqueous Li–O2 batteries

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Publication details

The article was received on 05 Nov 2018, accepted on 12 Jan 2019 and first published on 14 Jan 2019


Article type: Paper
DOI: 10.1039/C8NR08921C
Nanoscale, 2019,11, 2855-2862

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    An all-nanosheet OER/ORR bifunctional electrocatalyst for both aprotic and aqueous Li–O2 batteries

    M. Zhang, L. Zou, C. Yang, Y. Chen, Z. Shen and C. Bo, Nanoscale, 2019, 11, 2855
    DOI: 10.1039/C8NR08921C

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