The preparation parameters of vanadium nitride (VN) influence its grain size and surface chemical composition,thereby affecting its supercapacitive performance.The effects of process parameters in the preparation of VN via reduction-nitridation-selective leaching of Zn3(OH)2(V2O7)·(H2O)2 on its supercapacitive performance were systematically investigated in this paper.The results showed that reducing the ammonia flow rate,shortening the nitridation time,and lowering the nitridation temperature could decrease the grain size of VN,increase the contact area between the electrolyte and VN,and enhance its electric double-layer capacitance.Additionally,lowering the nitridation temperature could increase the contents of V-N-O and V-O on the VN surface and enhance its electrochemical activity.Increasing the NH3 flow rate,extending the nitridation time,and raising the nitridation temperature improved the specific capacity retention rate of VN.Considering both the specific capacity and rate performance of the VN material,the optimal process parameters were as follows:nitridation temperature of 550～600℃,ammonia flow rate of 100～200mL/min,and nitridation time of 2～4h.
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基金资助
河北省教育厅青年拔尖人才项目(BJK2024086);中央高校基本科研业务费资助(3142024026)
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