Supercapacitor electrode energetics and mechanism of operation: Uncovering the voltage window

Pandey, Deepak; Kumar, Kowsik Sambath; Thomas, Jayan

doi:10.1016/j.pmatsci.2023.101219

Cited by 19 publications

(1 citation statement)

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“…According to E = 0.5 CU 2 , the specific capacitance ( C ) and the operating voltage ( U ) are two key parameters to determine the energy density ( E ). 10,11 To date, many strategies are centered on complicated structure and composition electrode design to enhance the specific capacitance, which limits their scale up. 12–14 The design of asymmetric supercapacitors (ASCs) is the primary approach to broaden the operating voltage, which are typically assembled with low capacity carbon materials and require additional capacity matching.…”

Section: Introductionmentioning

confidence: 99%

The role of Mn in widening the potential window of solid solution derived electrodes for aqueous supercapacitors

Shi,

Liu,

Chen

et al. 2024

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

The role of Mn in widening the potential window of solid solution derived electrodes for aqueous supercapacitors

Shi,

Liu,

Chen

et al. 2024

J. Mater. Chem. A

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Advancements in Asymmetric Supercapacitors: From Historical Milestones to Challenges and Future Directions

Sadavar,

Lee,

Park

2024

Advanced Science

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Numerous challenges, like the uninterrupted supply of electricity, stable and reliable power, and energy storage during non‐operational hours, arise across various industries due to the absence of advanced energy storage technologies. With the continual technological advancements in portable electronics, green energy, and transportation, there are inherent limitations in their innovative production. Thus, ongoing research is focused on pursuing sustainable energy storage technologies. An emerging solution lies in the development of asymmetric supercapacitors (ASCs), which offer the potential to extend their operational voltage limit beyond the thermodynamic breakdown voltage range of electrolytes. This is achieved by employing two distinct electrode materials, presenting an effective solution to the energy storage limitations faced by ASCs. The current review concentrates on the progression of working materials to develop authentic pseudocapacitive energy storage systems (ESS). Also, evaluates their ability to exceed energy storage constraints. It provides insights into fundamental energy storage mechanisms, performance evaluation methodologies, and recent advancements in electrode material strategies. The review approaches developing high‐performance electrode materials and achieving efficient ASC types. It delves into critical aspects for enhancing the energy density of ASCs, presenting debates and prospects, thereby offering a comprehensive understanding and design principles for next‐generation ASCs in diverse applications.

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Hybrid and Asymmetric Supercapacitors: Achieving Balanced Stored Charge across Electrode Materials

Qorbani,

Chen,

Chen

2024

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An electrochemical capacitor configuration extends its operational potential window by leveraging diverse charge storage mechanisms on the positive and negative electrodes. Beyond harnessing capacitive, pseudocapacitive, or Faradaic energy storage mechanisms and enhancing electrochemical performance at high rates, achieving a balance of stored charge across electrodes poses a significant challenge over a wide range of charge–discharge currents or sweep rates. Consequently, fabricating hybrid and asymmetric supercapacitors demands precise electrochemical evaluations of electrode materials and the development of a reliable methodology. This work provides an overview of fundamental aspects related to charge‐storage mechanisms and electrochemical methods, aiming to discern the contribution of each process. Subsequently, the electrochemical properties, including the working potential windows, rate capability profiles, and stabilities, of various families of electrode materials are explored. It is then demonstrated, how charge balancing between electrodes falters across a broad range of charge–discharge currents or sweep rates. Finally, a methodology for achieving charge balance in hybrid and asymmetric supercapacitors is proposed, outlining multiple conditions dependent on loaded mass and charge–discharge current. Two step‐by‐step tutorials and model examples for applying this methodology are also provided. The proposed methodology is anticipated to stimulate continued dialogue among researchers, fostering advancements in achieving stable and high‐performance supercapacitor devices.

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Supercapacitor electrode energetics and mechanism of operation: Uncovering the voltage window

Cited by 19 publications

References 376 publications

The role of Mn in widening the potential window of solid solution derived electrodes for aqueous supercapacitors

The role of Mn in widening the potential window of solid solution derived electrodes for aqueous supercapacitors

Advancements in Asymmetric Supercapacitors: From Historical Milestones to Challenges and Future Directions

Hybrid and Asymmetric Supercapacitors: Achieving Balanced Stored Charge across Electrode Materials

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