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Fabrication of Perovskite-Based Porous Nanotubes as Efficient Bifunctional Catalyst and Application in Hybrid Lithium-Oxygen Batteries

Abstract

The design of efficient oxygen electrocatalysis is extremely important and urgent for many energy storage and conversion equipment. Among these, the high energy densities of lithium-oxygen battery (LOB) have driven us to explore the bifuctional catalysts. Comparing the non-aqueous LOBs blamed for the poor cycling stability due to the undesired side reaction, the hybrid LOBs have been considered as an alternative solution for their high electrochemical reversibility and good safety. Here, the one-dimensional hierarchical mesoporous/macroporous LaMn0.7Co0.3O3-x nanotubes were synthesized through the electrospinning method combined with annealing treatment. With the suitable heat treatment and rational doping Co element, the LMCO-800 samples show the well-designed hierarchical porous nanotube structure and possess the great bifuctional electrocatalytic performance. The linear sweep voltammetry (LSV) curves show that half-wave potential (E1/2) of LMCO-800 sample is 0.72 V (vs. RHE) and the average electron transfer number (n) is calculated to be 3.8. Moreover, the successful doping Co element into the LMCO-800 nanotubes can shorten the average distance of Mn-Mn atom and promote the formation of O-O bond, contributing to the enhanced OER performance. The high specific surface area and one-dimension nanotubes can greatly benefit the oxygen diffusion, facilitate the electrolyte infiltration and improve the electron transfer. Consequently, the as-assembled hybrid lithium-oxygen batteries with LMCO-800 cathode exhibit the superior cycling stability.

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Publication details

The article was received on 17 May 2018, accepted on 29 Jul 2018 and first published on 02 Aug 2018


Article type: Paper
DOI: 10.1039/C8TA04599B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Fabrication of Perovskite-Based Porous Nanotubes as Efficient Bifunctional Catalyst and Application in Hybrid Lithium-Oxygen Batteries

    H. Gong, T. Wang, H. Guo, X. Fan, X. Liu, L. Song, W. Xia, B. Gao, X. L. Huang and J. He, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA04599B

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