首页|Defect engineering on BiFeO3 through Na and V codoping for aqueous Na-ion capacitors
Defect engineering on BiFeO3 through Na and V codoping for aqueous Na-ion capacitors
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Sodium with low cost and high abundance is considered as a substitute element of lithium for batteries and supercapacitors,which need the appropriate host materials to accommodate the relatively large Na+ions.Compared to Li+storage,Na+storage makes higher demands on the structural optimization of perovskite bismuth ferrite(BiFeO3).We propose a novel strategy of defect engineering on BiFeO3 through Na and V codoping for high-efficiency Na+storage,to reveal the roles of oxygen vacancies and V ions played in the enhanced electrochemical energy storage performances of Na-ion capacitors.The formation of the oxygen vacancies in the Na and V codoped BiFeO3(denoted as NV-BFO),is promoted by Na doping and suppressed by V doping,which can be demonstrated by XPS and EPR spectra.By the first-principles calculations,the oxygen vacancies and V ions in NV-BFO are confirmed to substantially lower the Na+migration energy barriers through the space and electric field effects,to effectively promote the Na+trans-port in the crystals.Electrochemical kinetic analysis of the NV-BFO//NV-BFO capacitors indicates the dom-inant capacitive-controlled capacity,which depends on fast Na+deintercalation-intercalation process in the NV-BFO electrode.The NV-BFO//NV-BFO capacitors open up a new avenue for developing high-performance Na-ion capacitors.
BiFeO3Na+storageV dopingOxygen vacancyCapacitor
Wenyun Wang、Chao Yang、Shangjing Yu、Daotong Han、Wentao Qi、Rui Ling、Guangqiang Liu
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School of Physics and Physical Engineering,Qufu Normal University,Qufu 273165,Shandong,China
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