首页|Adjusting oxygen vacancy of VO2·xH2O nanoarray architectures for efficient NH4+storage
Adjusting oxygen vacancy of VO2·xH2O nanoarray architectures for efficient NH4+storage
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Aqueous rechargeable batteries are the promising energy storge technology due to their safety,low cost,and environmental friendliness.Ammonium ion(NH4+)is an ideal charge carrier for such batteries because of its small hydration radius and low molar mass.In this study,VO2·xH2O with rich oxygen defects(d-HVO)is designed and synthesized,and it exhibits unique nanoarray structure and good electrochemical performances for NH4+storge.Experimental and calculation results indicate that oxygen defects in d-HVO can enhance the conductivity and diffusion rate of NH4+,leading to improved electrochemical performances.The most significant improvement is observed in d-HVO with 2 mmol thiourea(d-HVO-2)(220 mAh·g-1at 0.1 A·g-1),which has a moderate defect content.A full cell is assembled using d-HVO-2 as the anode and polyaniline(PANI)as the cathode,which shows excellent cycling stability with a capacity retention rate of 80％after 1000 cycles and outstanding power density up to 4540 W·kg-1.Moreover,the flexible d-HVO-2‖PANI battery,based on quasi-solid electrolyte,shows excellent flexibility under different bending conditions.This study provides a new approach for designing and developing high-performance NH4+storage electrode materials.
hydrate vanadium dioxideoxygen defectsammonium-ion batteryanode material
School of Chemistry,Dalian University of Technology,Dalian 116024,China
School of Chemistry and Materials Sciences,CAS Key Laboratory of Materials for Energy Conversion,CAS Center for Excellence in Nanoscience,University of Science and Technology of China,Hefei 230026,China
College of Environmental and Chemical Engineering,Dalian University,Dalian 116622,China
Natural Science Foundation of Liaoning ProvinceLarge Instrument and Equipment Open Foundation of Dalian University of Technology
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