Overview of transition metal-based composite materials for supercapacitor electrodes

Cui, Mingjin; Meng, Xiangkang

doi:10.1039/d0na00573h

Cited by 135 publications

(53 citation statements)

References 124 publications

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“…Advancement of supercapacitors (SCs) in the field of electrochemical devices have been noticeable due to their superior power density, quick charge/discharge rate, long shelf life and high Coulombic efficiency. [ 1–3 ] In this regard, porous carbon‐based SC materials are known to exhibit electric double layer capacitance property and have strongly emerged as SC electrode due to its versatile characteristics of high power density, chemical stability, high conductivity, low cost, and natural abundancy. [ 4–6 ] However, in most cases, the carbon‐based materials are associated with low energy density and it has scope for improvement to meet the requirement for commercialization purpose.…”

Section: Introductionmentioning

confidence: 99%

Oxygen‐Rich Porous Activated Carbon from Eucalyptus Wood as an Efficient Supercapacitor Electrode

Atika

Dutta

2021

Energy Tech

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Herein, lignin‐rich KOH‐activated porous carbon from eucalyptus wood (named as PACE) is presented as an efficient electrode for supercapacitors (SCs). Compared with the most commonly used higher activation temperature, i.e., 800 °C with KOH (PACE‐800), a more efficient SC is developed by activating carbon with KOH at lesser temperature, i.e., 600 °C (PACE‐600). The high specific capacitance (i.e., 230 F g−1 at 1 A g−1 measured in a 2 m NaCl electrolyte) measured by galvanostatic charge–discharge (GCD) studies is not primarily due to larger surface area, but due to the inherent electron‐rich oxygen‐based functionalities that persist at the lower activation temperature, contributing to the hydrophilic nature to PACE‐600. The mechanism of the capacitive charge storage is deduced from electrochemical impedance spectroscopy (EIS). The application of PACE‐600 as a SC electrode is confirmed from insignificant loss in the specific capacitance after 10 000 charging–discharging cycles, recorded at 10 A g−1. Further, fabrication of higher‐voltage (1.6 V) symmetric SC PACE‐600//PACE‐600 in aqueous neutral electrolyte (2 m NaCl) is presented, which illuminates a red LED (1.8 V) for 1 min after charging for 5 s. The corresponding energy density is calculated to be 41 W h kg−1, and at a power density of 2396 W kg−1.

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Section: Introductionmentioning

confidence: 99%

Oxygen‐Rich Porous Activated Carbon from Eucalyptus Wood as an Efficient Supercapacitor Electrode

Atika

Dutta

2021

Energy Tech

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“…It also includes the selection of different electrode substrates, such as Ni foam, Cu foam, and carbon cloth, to directly control the structure and morphology of the electrode materials [ 4 ]. Another way is to select an appropriate component to construct the composite structure [ 5 ], which can be divided into two cases. In one case, the components with capacitance characteristics constitute the composite materials, and this can generate a synergistic effect between the two active materials and the performance of materials can be improved thereby.…”

Section: Introductionmentioning

confidence: 99%

In Situ Construction of ZnO/Ni2S3 Composite on Ni Foam by Combing Potentiostatic Deposition with Cyclic Voltammetric Electrodeposition

Geng

Wang

et al. 2021

Micromachines

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The ZnO/Ni2S3 composite has been designed and in situ synthesized on Ni foam substrate by two steps of electrodeposition. ZnO was achieved on Ni foam by a traditional potentiostatic deposition, followed by cyclic voltammetric (CV) electrodeposition, to generate Ni2S3, where the introduction of ZnO provides abundant active sites for the subsequent Ni2S3 electrodeposition. The amount of deposit during CV electrodeposition can be adjusted by setting the number of sweep segment and scan rate, and the electrochemical characteristics of the products can be readily optimized. The synergistic effect between the ZnO as backbones and the deposited Ni2S3 as the shell enhances the electrochemical properties of the sample significantly, including a highly specific capacitance of 2.19 F cm−2 at 2 mA cm−2, good coulombic efficiency of 98%, and long-term cyclic stability at 82.35% (4000 cycles).

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“…Indeed, looking back to the discovery of pseudocapacitance in RuO 2 , the nanoporous/nanostructuring enhanced the interfacial area between the electrolyte and the RuO 2 , and provided more reactive sites accessible for charge transfer reaction, giving rise to much improved overall electrochemical performance. [ 101a ] Simultaneously, the slow reaction rate could be largely raised to decrease the charging/discharging times to ≈10 s by absorbing a higher volume of electrolyte into the porous electrode. In another example, the pseudocapacitive Li + intercalation kinetics in the nanoporous/nanostructured T‐Nb 2 O 5 with high surface area and numerous mesoporous was reported by Brezesinski et al in 2010.…”

Section: Porous Pseudocapacitive Electrodes For High‐volumetric Performancementioning

confidence: 99%

“…In another example, the pseudocapacitive Li + intercalation kinetics in the nanoporous/nanostructured T‐Nb 2 O 5 with high surface area and numerous mesoporous was reported by Brezesinski et al in 2010. [ 101b ] The mesoporous film electrodes are assemblies of nanostructured materials that can provide short solid‐state diffusion distances as well as electronic conduction through interconnected grains and high porosity for electrolyte accessibility. Moreover, highly porous metal‐organic frameworks (MOFs) can offer intrinsically pseudocapacitive charge storage, due to their crystalline structures with highly tunable and large porosity as well as good electronic and fast ionic conduction; thus, they have been demonstrated as high‐performance PC electrodes.…”

Section: Porous Pseudocapacitive Electrodes For High‐volumetric Performancementioning

confidence: 99%

“Porous and Yet Dense” Electrodes for High‐Volumetric‐Performance Electrochemical Capacitors: Principles, Advances, and Challenges

et al. 2021

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With the ever-rapid miniaturization of portable, wearable electronics and Internet of Things, the volumetric performance is becoming a much more pertinent figure-of-merit than the conventionally used gravimetric parameters to evaluate the charge-storage capacity of electrochemical capacitors (ECs). Thus, it is essential to design the ECs that can store as much energy as possible within a limited space. As the most critical component in ECs, "porous and yet dense" electrodes with large ion-accessible surface area and optimal packing density are crucial to realize desired high volumetric performance, which have demonstrated to be rather challenging. In this review, the principles and fundamentals of ECs are first observed, focusing on the key understandings of the different charge storage mechanisms in porous electrodes. The recent and latest advances in high-volumetric-performance ECs, developed by the rational design and fabrication of "porous and yet dense" electrodes are then examined. Particular emphasis of discussions then concentrates on the key factors impacting the volumetric performance of porous carbon-based electrodes. Finally, the currently faced challenges, further perspectives and opportunities on those purposely engineered porous electrodes for high-volumetric-performance EC are presented, aiming at providing a set of guidelines for further design of the next-generation energy storage devices.

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Overview of transition metal-based composite materials for supercapacitor electrodes

Abstract: Supercapacitors (SCs) can bridge the gap between batteries and conventional capacitors, playing a critical role as an efficient electrochemical storage device in the intermittent renewable energy sources. Transition metal-based electrode...

Cited by 135 publications

References 124 publications

Oxygen‐Rich Porous Activated Carbon from Eucalyptus Wood as an Efficient Supercapacitor Electrode

Oxygen‐Rich Porous Activated Carbon from Eucalyptus Wood as an Efficient Supercapacitor Electrode

In Situ Construction of ZnO/Ni2S3 Composite on Ni Foam by Combing Potentiostatic Deposition with Cyclic Voltammetric Electrodeposition

“Porous and Yet Dense” Electrodes for High‐Volumetric‐Performance Electrochemical Capacitors: Principles, Advances, and Challenges

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