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One-Step Route Synthesized Co P/Ru/N-Doped Carbon Nanotube Hybrids as Bifunctional Electrocatalysts for High-Performance Li-O Batteries.

著者 Wang P , Li C , Dong S , Ge X , Zhang P , Miao X , Zhang Z , Wang C , Yin L
Small.2019 May 10 ; ():e1900001.
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The large-scale commercial application of lithium-oxygen batteries (LOBs) is overwhelmed by the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) associated with insoluble and insulated Li O . Herein, an elaborate design on a highly catalytic LOBs cathode constructed by N-doped carbon nanotubes (CNT) with in situ encapsulated Co P and Ru nanoparticles is reported. The homogeneously dispersed Co P and Ru catalysts can effectively modulate the formation and decomposition behavior of Li O during discharge/charge processes, ameliorating the electronically insulating property of Li O and constructing a homogenous low-impedance Li O /catalyst interface. Compared with Co/CNT and Ru/CNT electrodes, the Co P/Ru/CNT electrode delivers much higher oxygen reduction triggering onset potential and higher ORR and OER peak current and integral areas, showing greatly improved ORR/OER kinetics due to the synergistic effects of Co P and Ru. Li-O cells based on the Ru/Co P/CNT electrode demonstrate improved ORR/OER overpotential of 0.75 V, excellent rate capability of 12 800 mAh g at 1 A g , and superior cycle stability for more than 185 cycles under a restricted capacity of 1000 mAh g at 100 mA g . This work paves an exciting avenue for the design and construction of bifunctional catalytic cathodes by coupling metal phosphides with other active components in LOBs.
PMID: 31074926 [PubMed - as supplied by publisher]
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