Electrochemical characterization of RuO2 and activated carbon (AC) electrodes using multivalent Ni(NO3)2 electrolyte for charge storage applications

Guduru, Ramesh K.; Icaza, Juan C.; Pudi, Sandeep Kumar

doi:10.1016/j.est.2020.102170

Cited by 8 publications

(3 citation statements)

References 45 publications

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“…MXenes, the class of two-dimensional (2D) materials with chemical formula M n +1 X n T 2 (M is a transition metal, X is either carbon or nitrogen, T is a functional group like –O, –F, or −OH passivating the surface) discovered only about a decade ago, have grabbed the attention of the materials research community. This is due to the superior electrochemical performance of the first discovered MXene Ti 3 C 2 T x , over other established 2D materials like graphene, − transition metal dichalcogenides (VSe 2 , WS 2 ), and transition metal oxides (RuO 2 , , MnO 2 , − NiO). Flexibility in the composition makes MXenes suitable for the further exploration of enhanced functionalities by tweaking their compositions and structures.…”

Section: Introductionmentioning

confidence: 99%

Improved Charge Storage Capacity of Supercapacitor Electrodes by Engineering Surfaces: The Case of Janus MXenes

Das,

Ghosh

2024

J. Phys. Chem. C

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Surface engineering in two-dimensional (2D) materials has turned out to be a useful technique to improve their functional properties. By designing Janus compounds MM′C in the MXene family of compounds M 2 C, where the two surfaces are constituted by two different transition metals M and M′, we have explored their potentials as electrodes in a supercapacitor with an acidic electrolyte. Using density functional theory (DFT) in conjunction with the classical solvation model, we have made an indepth analysis of the electrochemical parameters of three Janus MXenes, passivated by oxygen: NbVC, MnVC, and CrMnC. Comparisons with the corresponding end-point MXenes Nb 2 C, V 2 C, Mn 2 C, and Cr 2 C are also made. We find that the surface redox activity enhances due to the formation of Janus, improving the charge storage capacities of MXene electrodes significantly. Our analysis reveals that the improved functionality has its root in the variations in the charge state of one of the constituents in the Janus compound, which, in turn, has its origin in the electronic structure changes due to surface manipulation. Our work, which is the first on the electrochemical properties of Janus MXenes for supercapacitor applications, suggests surface engineering by forming appropriate Janus compounds as a possible route to extract high energy density in MXene electrode−acidic electrolyte-based energy storage devices.

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Section: Introductionmentioning

confidence: 99%

Improved Charge Storage Capacity of Supercapacitor Electrodes by Engineering Surfaces: The Case of Janus MXenes

Das,

Ghosh

2024

J. Phys. Chem. C

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“…In this regard, various strategies have been implemented to minimize the RuO 2 loading, such as a) use as a single electrode in asymmetric supercapacitor configuration and b) combined with other electrode material in the form of composite. [ 4 ] These strategies can efficiently address the cost issue while enhancing the supercapacitor performance.…”

Section: Introductionmentioning

confidence: 99%

A Flexible, Redox‐Active, Aqueous Electrolyte‐Based Asymmetric Supercapacitor with High Energy Density Based on Keratin‐Derived Renewable Carbon

Sinha

Kar

Naskar

2022

Adv Materials Technologies

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This work exploits the advantage of asymmetric configuration over symmetric supercapacitor in designing high energy density flexible devices from two active electrode materials–keratin‐based renewable‐resource hierarchically porous carbon and hydrous ruthenium oxide (RuO2). The asymmetric device exhibits significantly high capacitance. Conventional estimation of energy storage parameters, however, cannot be applied for devices with a Faradaic energy storage contribution via redox charge transfer mechanism. Therefore, this work applies a precise measurement of pseudocapacitance contribution at various scan rates to correct the device data that reveals effective capacitance of 120 F g−1 with the energy density of 37 W h kg−1 at 776 W kg−1. It also retains excellent rate capability, >74% at high current density 25 A g−1. The charge storage activity and device stability can be further enhanced by introducing redox‐active electrolytes that improve specific capacitance, but the rate capabilities deteriorate at high current densities. Further, the principle of asymmetric electrode design is applied to fabricate a bending‐tolerant, flexible device by depositing active electrode material on wire‐shaped current collector followed by coupling those separated with polyvinyl alcohol gel containing redox electrolyte; it yields 36.8 mF cm−1 specific capacitance at a 0.2 mA cm−1 current density.

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“…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.…”

mentioning

confidence: 99%

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

Kuo¹,

Chen

Lai

et al. 2021

IEEE J. Electron Devices Soc.

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Electrochemical characterization of RuO2 and activated carbon (AC) electrodes using multivalent Ni(NO3)2 electrolyte for charge storage applications

Cited by 8 publications

References 45 publications

Improved Charge Storage Capacity of Supercapacitor Electrodes by Engineering Surfaces: The Case of Janus MXenes

Improved Charge Storage Capacity of Supercapacitor Electrodes by Engineering Surfaces: The Case of Janus MXenes

A Flexible, Redox‐Active, Aqueous Electrolyte‐Based Asymmetric Supercapacitor with High Energy Density Based on Keratin‐Derived Renewable Carbon

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

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Electrochemical characterization of RuO2 and activated carbon (AC) electrodes using multivalent Ni(NO3)2 electrolyte for charge storage applications

Cited by 8 publications

References 45 publications

Improved Charge Storage Capacity of Supercapacitor Electrodes by Engineering Surfaces: The Case of Janus MXenes

Improved Charge Storage Capacity of Supercapacitor Electrodes by Engineering Surfaces: The Case of Janus MXenes

A Flexible, Redox‐Active, Aqueous Electrolyte‐Based Asymmetric Supercapacitor with High Energy Density Based on Keratin‐Derived Renewable Carbon

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

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