【摘 要】
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Rechargeable aqueous zinc ion battery (RAZIB) is a promising energy storage system due to its high safety,and high capacity.Among them,manganese oxides with low
【机 构】
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Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University,
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Rechargeable aqueous zinc ion battery (RAZIB) is a promising energy storage system due to its high safety,and high capacity.Among them,manganese oxides with low cost and low toxicity have drawn much attention.However,the under-debate proton reaction mechanism and unsatisfactory electrochemical performance limit their applications,Nanorod β-MnO2 synthesized by hydrothermal method is used to investigate the reaction mechanism.As cathode materials for RAZIB,the Zn//β-MnO2 delivers 355 mAh g-1 (based on cathode mass) at 0.1 A g-1,and retain 110 mAh g-1 after 1000 cycles at 02 A g-1.Different from conventional zinc ion insertion/ extraction mechanism,the proton conversion and Mn ion dissolution/deposition mechanism of β-MnO2 is proposed by analyzing the evolution of phase,structure,morphology,and element of β-MnO2 electrode,the pH change of electrolyte and the determination of intermediate phase MnOOH.Zinc ion,as a kind of Lewis acid,also provides protons through the formation of ZHS in the proton reaction process.This study of reaction mechanism provides a new perspective for the development of Zn//MnO2 battery chemistry.
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