Asymmetric micro-supercapacitors based on electrodeposited Ruo2 and sputtered VN films

Abstract

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Laser-Induced Interdigital Structured Graphene Electrodes Based Flexible Micro-Supercapacitor for Efficient Peak Energy Storage

“…The pore distribution on the electrode surface plays a vital role for electrochemical charge storage performance of a device [ 18 , 19 ]. Larger number of pores on the electrode surface enhances the infiltration of the electrolyte ions within the pores leading to the increase of capacitance value as well as energy density of the device [ 17 , 20 ]. The EDX mapping area ( Figure 1 b) with different colors also represents the oxygen rich (green color) and carbon rich (red color) areas of the LIG converted PI-foil.…”

“…The second part by means of parallel combination of constant phase element (CPE1), Warburg impedance (W 0 ) and charge transfer resistance (R ct ), respectively represents quite common charge transfer phenomenon of porous graphene electrodes. The relatively higher R ct of 348 Ω signifies the lower infiltration of electrolyte ions or higher ionic transfer resistance effect within the smaller pores inside the electrode active sites [ 9 , 11 , 17 ]. The third portion of the circuit model CPE2 represents the electrochemical activity or kinetics occurred at the electrode/electrolyte interface of LIG-electrodes.…”

“…Thus, the simultaneous obtainment of high areal energy density as well as high power density at a MSC becomes a major challenge [ 12 , 16 ]. This issue can be encountered by coupling the nano-porous carbon electrodes with suitable electrolytes that offer a wide stable electrochemical potential window to accomplish superior MSCs exhibiting higher capacitance values, higher energy density and long cycle stability [ 10 , 11 , 17 ].…”

Perspective on Micro-Supercapacitors

“…Thanks to the structure of the planar cross finger, the micro ultracapacitors not only maintain the ultra-long cycle stability, but also show better performance than the traditional sandwich ultracapacitors. Up to now, in-plane interdigital MSCs with excellent electrochemical performance are prepared by various methods such as photolithography ( Kim et al, 2013 ; Wu et al, 2014 ; Diao et al, 2020 ), ink printing ( Li et al, 2017b ; Zhang et al, 2019 ), screen-pritting ( Li et al, 2019a ; Abdolhosseinzadeh et al, 2020 ; Liang et al, 2020 ), laser processing ( Xie et al, 2016 ; Tao et al, 2019 ; Wang et al, 2020b ), spray-masking ( Wang et al, 2017 ; Xiong et al, 2019 ; Zhao et al, 2019 ), electrodeposition ( Makino et al, 2013 ; Li et al, 2017a ; Asbani et al, 2021 ) and 3D printing ( Yu et al, 2017 ; Yu et al, 2018 ; Wang et al, 2020c ). Each method of MSCs preparation has its own advantages and disadvantages, and most of the methods are difficult to satisfy the preparation of multiple MSCs simultaneously.…”

Analysis of CMOS Extended-Gate Field-Effect Transistor With On-Chip Window Based on Uricase/RuO2 Sensing Film

“…Ruthenium dioxide (RuO2) is a metal oxide with high conductivity, high corrosion resistance, high stability, and high capacitance, that caused more charge to accumulate on RuO2 sensing window [16][17][18][19]. It is generally used as a supercapacitor due to its capacitance property and stability [20][21][22][23]. For this study, the RuO2 was used as the passivation layer on the top metal of the sensing window.…”