Atomically dispersed cobalt catalyst anchored on nitrogen-doped carbon nanosheets for lithium-oxygen batteries

Peng Wang, Yingying Ren, Rutao Wang, Peng Zhang, Mingjie Ding, Caixia Li, Danyang Zhao, Zhao Qian, Zhiwei Zhang, Luyuan Zhang and Longwei Yin ()
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Peng Wang: Shandong University
Yingying Ren: Shandong University
Rutao Wang: Shandong University
Peng Zhang: Shandong University
Mingjie Ding: Shandong University
Caixia Li: Shandong University
Danyang Zhao: Shandong University
Zhao Qian: Shandong University
Zhiwei Zhang: Shandong University
Luyuan Zhang: Shandong University
Longwei Yin: Shandong University

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Developing single-site catalysts featuring maximum atom utilization efficiency is urgently desired to improve oxidation-reduction efficiency and cycling capability of lithium-oxygen batteries. Here, we report a green method to synthesize isolated cobalt atoms embedded ultrathin nitrogen-rich carbon as a dual-catalyst for lithium-oxygen batteries. The achieved electrode with maximized exposed atomic active sites is beneficial for tailoring formation/decomposition mechanisms of uniformly distributed nano-sized lithium peroxide during oxygen reduction/evolution reactions due to abundant cobalt-nitrogen coordinate catalytic sites, thus demonstrating greatly enhanced redox kinetics and efficiently ameliorated over-potentials. Critically, theoretical simulations disclose that rich cobalt-nitrogen moieties as the driving force centers can drastically enhance the intrinsic affinity of intermediate species and thus fundamentally tune the evolution mechanism of the size and distribution of final lithium peroxide. In the lithium-oxygen battery, the electrode affords remarkably decreased charge/discharge polarization (0.40 V) and long-term cyclability (260 cycles at 400 mA g−1).

Date: 2020
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DOI: 10.1038/s41467-020-15416-4

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