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. 2023 Nov 21;16(1):27.
doi: 10.1007/s40820-023-01240-0.

Atomically Dispersed Ruthenium Catalysts with Open Hollow Structure for Lithium-Oxygen Batteries

Xin Chen  1 , Yu Zhang  2 , Chang Chen  3 , Huinan Li  3 , Yuran Lin  4 , Ke Yu  3 , Caiyun Nan  4 , Chen Chen  5
Affiliations

Atomically Dispersed Ruthenium Catalysts with Open Hollow Structure for Lithium-Oxygen Batteries

Xin Chen et al. Nanomicro Lett. .

Abstract

Lithium-oxygen battery with ultra-high theoretical energy density is considered a highly competitive next-generation energy storage device, but its practical application is severely hindered by issues such as difficult decomposition of discharge products at present. Here, we have developed N-doped carbon anchored atomically dispersed Ru sites cathode catalyst with open hollow structure (h-RuNC) for Lithium-oxygen battery. On one hand, the abundance of atomically dispersed Ru sites can effectively catalyze the formation and decomposition of discharge products, thereby greatly enhancing the redox kinetics. On the other hand, the open hollow structure not only enhances the mass activity of atomically dispersed Ru sites but also improves the diffusion efficiency of catalytic molecules. Therefore, the excellent activity from atomically dispersed Ru sites and the enhanced diffusion from open hollow structure respectively improve the redox kinetics and cycling stability, ultimately achieving a high-performance lithium-oxygen battery.

Keywords: Atomically dispersed; Discharge product; Lithium; Open hollow structure; Oxygen battery.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1
Fig. 1
a Schematic illustration of the fabrication of h-RuNC. b TEM image of h-ZIF-8. c TEM image of h-RuNC. d HAADF-STEM and corresponding elemental mapping images of h-RuNC. e AC HAADF-STEM image of h-RuNC. f XRD patterns of catalysts. g Pore size distribution of s-NC and h-NC
Fig. 2
Fig. 2
a Normalized XANES spectra of Ru K-edge. b Fourier-transform EXAFS spectra of R space. c Wavelet transform of Ru foil, h-RuNC and RuO2. d XPS N 1s spectra of s-NC, h-NC and h-RuNC. e Raman spectra of s-NC, h-NC and h-RuNC
Fig. 3
Fig. 3
a Full discharge/charge curves of as-synthesized catalysts at the current density of 200 mA g–1. b Comparison of discharge capacities of different catalysts at different current densities. c First discharge/charge curves of as-synthesized catalysts. Discharge/charge curves of d s-NC, e h-NC and f h-RuNC. g Plots of medium voltage against cycling number. h Cycling performances of the as-synthesized catalysts
Fig. 4
Fig. 4
SEM images of the cathodes after discharge and recharge a-c s-NC. d-e h-NC. g-h h-RuNC at different states. a, d, g pristine, b, e, h after full discharge, c, f, i after recharge. j Schematic diagram of catalytic activity enhancement from s-NC to h-NC to h-RuNC
See this image and copyright information in PMC

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