A rational preparation strategy of phase tuned MoO_(3) nanostructures for high-performance all-solid asymmetric supercapacitor  

作　　者：M.Kundu D.Mondal I.Mondal A.Baral P.Halder S.Biswas B.K.Paul N.Bose R.Basu S.Das 

机构地区：[1]Department of Physics,Jadavpur University,Kolkata 700032,India [2]Department of Physics,Jogamaya Devi College,Kolkata 700026,India [3]Rescon India Pvt.Ltd,Kolkata 700034,India [4]School of Advanced Materials,Green Energy and Sensor Systems(SAMGESS),IIEST,Shibpur,Howrah 711103,India [5]Bangabasi College,Kolkata 700009,India [6]University of Engineering and Management,Kolkata 700160,India

出　　处：《Journal of Energy Chemistry》2023年第12期192-206,I0006,共16页能源化学（英文版）

摘　　要：In this work,phase and morphology-tuned MoO_(3) nanostructures are synthesized through a novel modified co-precipitation method,and their electrochemical properties are investigated.For the first time,such a simple surfactant-assisted synthesis process aided by minor temperature variations is reported which results in phase transition of the nanoparticles from h-MoO_(3) nano-rods to a-MoO_(3) nano-flakes.The nanostructures thus developed are highly porous and crystalline with significantly large specific surface area as compared to previous literature.The theoretical bandgap energy of the optimized sample calculated using Perdew-Zunger local density approximation(LDA) is in good agreement with the experimental findings.An overall structural,morphological,and surface-behavioural analysis predicts the electrochemical superiority in 2D a-MoO_(3).The cyclic voltammetry and galvano-potentiometry measurements of 2D a-MoO_(3) in the potential window of-0.6 V to +0.2 V present the highest pseudosupercapacitive response with a maximum specific capacitance of 829 F g^(-1)at 2 A g^(-1)as compared to h-MoO_(3) (452 F g^(-1)) and h@a-MoO_(3) (783 F g^(-1)).Thus,the MoO_(3) 2D nanostructures synthesized through our novel synthesis technique display excellent specific capacitance as compared to previous reported data.Additionally,a-MoO_(3) exhibits a galvanostatic charging-discharging cyclic stability of about 91%after 2000 cycles,indicating that it can serve as an excellent electrode material for supercapacitors.A solid-state asymmetric supercapacitor device is successfully constructed using a-MoO_(3) which can light up 4 red LEDs for 10 s.The specific energy density of the device reaches a maximum value of 36.3 W h kg^(-1)at the power density of 50 W kg^(-1).

关 键 词：MoO_(3)nanoparticles Asymmetric solid-state supercapacitor Electrochemical performance Low-temperature novel synthesis technique Density functional calculations 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM53[电气工程—电器]