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La_(0.5)Sr_(0.5)CoO_(3-δ)/Ti_3C_2T_x as Bifunctional Efficient Hybrid Catalysts for Li-O_2 battery

Zemin Sun  Mengwei Yuan  Genban Sun  Huifeng Li  
【摘要】:Li-oxygen batteries have drawn widespread attention in the past decades.Herein,bifunctional hybrid catalysts based on perovskite La_(0.5)Sr_(0.5)Co O_(3-δ)with Ti_3C_2T_x MXene nanosheets are prepared for application as electrocatalysts in Li-oxygen batteries.It is the first time to use high Li ionic diffusion Ti_3C_2T_x in Li-oxygen batteries and making it as substrate in-situ growth of high oxygen adsorption and O~(2-)transport perovskite La_(0.5)Sr_(0.5)CoO_(3-δ).In this way,the in-situ hybrid catalysts show outstanding catalytic performance to facilitate the reaction kinetics,which display overpotential of only 0.87 V,lower than the Ti_3C_2T_x about 540 mV,La_(0.5)Sr_(0.5)CoO_(3-δ)about 430 mV.The Li-oxygen batteries with LaSrCoO/Ti_3C_2T_x electrodes run more than 80 cycles at 500 mA g~(-1) with capacity restriction of 1000 mAh g~(-1),much better than Ti_3C_2T_x (9 cycles),La_(0.5)Sr_(0.5)CoO_(3-δ)(15 cycles) and other reported catalysts based on the perovskite.Moreover,the Li-oxygen batteries with LaSrCoO/Ti_3C_2T_x electrode deliver highest initial discharge capacity about 11340 mAh g~(-1) at 500 mA g~(-1),which is about twice than LaSrCoO cathode(6700 m Ah g~(-1)) and Ti_3C_2T_x (5210 m Ah g~(-1)).All the results suggest that the strategy would be a promising approach to enhance the LOBs performance.~([1])

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