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Self-assembling RuO2 nanogranulates with few carbon layers as an interconnected nanoporous structure for lithium–oxygen batteries

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Abstract

Electrocatalysis for cathodic oxygen is of great significance for achieving high-performance lithium–oxygen batteries. Herein, we report a facile and green method to prepare an interconnected nanoporous three-dimensional (3D) architecture, which is composed of RuO2 nanogranulates coated with few layers of carbon. The as-prepared 3D nanoporous RuO2@C nanostructure can demonstrate a high initial specific discharge capacity of 4000 mA h g−1 with high round-trip efficiency of 95%. Meanwhile, the nanoporous RuO2@C could achieve stable cycling performance with a fixed capacity of 1500 mA h g−1 over 100 cycles. The terminal discharge and charge potentials of nanoporous RuO2@C are well maintained with minor potential variation of 0.14 and 0.13 V at the 100th cycle, respectively. In addition, the formation of discharge products is monitored by using in situ high-energy synchrotron X-ray diffraction (XRD).

Graphical abstract: Self-assembling RuO2 nanogranulates with few carbon layers as an interconnected nanoporous structure for lithium–oxygen batteries

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Article information


Submitted
12 Feb 2020
Accepted
20 Apr 2020
First published
24 Apr 2020

Chem. Commun., 2020, Advance Article
Article type
Communication

Self-assembling RuO2 nanogranulates with few carbon layers as an interconnected nanoporous structure for lithium–oxygen batteries

W. Lai, Z. Zheng, W. Wang, L. Wang, Y. Lei, Y. Wang, J. Wang, H. Liu, S. Chou and S. Dou, Chem. Commun., 2020, Advance Article , DOI: 10.1039/D0CC01125H

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