Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 254, Issue -, Pages 523-530Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.05.025
Keywords
Electrocatalyst; Li-O(2)batteries; Manganese oxide; Mesoporous carbon; Multilayer hybrid 2D nanosheet
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2017R1A2A1A17069463, NRF-2017R1A2B3004383]
- Korea government (MSIT) [NRF-2017R1A5A1015365]
- MOST
- POSTECH
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An effective methodology to explore highly efficient oxygen electrocatalysts and electrodes for Li - O-2 batteries is developed via intimate layer-by-layer hybridization between mesoporous carbon layer and highly anisotropic 2D metal oxide nanosheets. The obtained multilayer hybrid nanosheets of mesoporous carbon -layered MnO2 display outstanding functionalities as oxygen electrocatalysts with low overpotential and as the electrodes of Li - O-2 batteries with huge discharge capacity of 7000 mAhg(-1) at 200 mAg(-1) and improved cyclability. The excellent electrocatalyst/electrode bifunctionality of the present material is attributable to enhanced electron transfer kinetics, maximized active sites, promoted electrocatalysis kinetics, and stabilization of unstable Mn(3+)species. This multilayer hybrid nanosheet structure is advantageous for facilitating reversible formation/decomposition of discharged product during cycling in Li - O-2 batteries via promoted electrolyte-oxygen diffusion. The present study underscores that exfoliated metal oxide nanosheet can be used as an efficient immobilization matrix for synthesizing novel 2D multilayer hybrid nanosheets with synergistically-improved electrocatalyst/electrode functionalities.
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