Extending the cycle life of high mass loading MoOx electrode for supercapacitor applications

Cai, Xiang; Song, Yu; Wang, Siqi; Sun, Xiaoqi; Liu, Xiaoxia

doi:10.1016/j.electacta.2019.134877

Cited by 20 publications

(20 citation statements)

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“…Taking advantage of its high-massloading capability, the areal capacity of the AMC also outstrips most recently reported MoO x electrodes (Figure 3d). [23,30,34,[42][43][44][45][46][47] That is, the presence of oxygen-activated surface enables AMC to achieve higher redox depth and faster energy storage, even when prepared as thick electrodes. More importantly, the AMC electrode delivers amazing areal capacities (>3.3 C cm −2 ) at 2.5-7.5 A g −1 , which remains challenging for the majority of pseudocapacitive electrodes (Figure 3e).…”

Section: Resultsmentioning

confidence: 99%

Enhancing Li‐Ion Affinity of Molybdenum Dioxide/Carbon Fabric to Achieve High Pseudocapacitance

Liu

Zhang

Yang

et al. 2021

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High‐energy electrodes at high mass loadings (usually >8.0 mg cm−2) are desired for aqueous pseudocapacitors. Yet, how to overcome the thickness‐dependent resistance increase of ion/electron transport in pseudocapacitive materials is still challenging. Herein, a high‐performance electrode (denoted as AMC) adapted to high mass loading is achieved by promoting the Li‐ion affinity of 3D MoO2/carbon fabric. The experimental results and corresponding computational results reveal that the oxygen‐activated surface of AMC, combined with the wettability and conductivity superiority of 3D graphite network, significantly facilitates the Li‐ion adsorption and diffusion at the electrode/electrolyte interface, even at large thicknesses. Consequently, even at a high mass loading up to 8.1 mg cm−2, the AMC electrode also displays an impressive specific capacity (567.5 C g−1 at 2.5 A g−1), substantially superior to most advanced pseudocapacitive electrodes. The strategy of boosting energy characteristic by enhancing the affinity of charge carriers is applicable to other pseudocapacitive electrodes.

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Section: Resultsmentioning

confidence: 99%

Enhancing Li‐Ion Affinity of Molybdenum Dioxide/Carbon Fabric to Achieve High Pseudocapacitance

Liu

Zhang

Yang

et al. 2021

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“…MoO x is usually deposited by cathodic electrodeposition in aqueous electrolytes containing molybdates (e.g., sodium molybdate and ammonium molybdate) [38], iso-/peroxo-polymolybdates [213], and ammonium paramolybdates [219]. Electrodeposited MoO x are typically quasi-amorphous, nonstoichiometric oxide films [38,[220][221][222]. Its composition, structure, and electrochemical performance of the deposited MoO x materials highly depend on electrolyte composition, pH value, and magnitudes of the applied current density and voltage [223][224][225].…”

Section: Molybdenum Oxidesmentioning

confidence: 99%

“…23g) [228]. The exfoliated graphene sheets and the laminar structure of the graphite base addressed the negative impact of the poor electrical conductivity of the atop MoO [38]. They discovered that the potential window within − 1 to − 0.4 V vs. SCE permitted the redox reaction associated with Mo 4+ and Mo 5+ and prevented the formation of Mo 6+ .…”

Section: Molybdenum Oxidesmentioning

confidence: 99%

“…2 ). Compounds with multivalent species reportedly possess augmented capacitance [ 35 ], improved rate capability [ 34 , 36 ], as well as enhanced cycling stability [ 37 , 38 ] compared to their monovalent counterparts.

Fig.…”

Section: Fundamentals Of Electrochemical Synthesis Techniquesmentioning

confidence: 99%

“…Like other pseudocapacitive materials, electrodeposited MoO x exhibits high capacitance, but unsatisfactory cycling instability. To extend the life span of electrodeposited MoO x , Cai et al reported a potential window tuning strategy for MoO x [ 38 ]. They discovered that the potential window within − 1 to − 0.4 V vs. SCE permitted the redox reaction associated with Mo 4+ and Mo 5+ and prevented the formation of Mo 6+ .…”

Section: Metal Oxides and Hydroxidesmentioning

confidence: 99%

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A Review on Nano-/Microstructured Materials Constructed by Electrochemical Technologies for Supercapacitors

et al. 2020

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The article reviews the recent progress of electrochemical techniques on synthesizing nano-/microstructures as supercapacitor electrodes. With a history of more than a century, electrochemical techniques have evolved from metal plating since their inception to versatile synthesis tools for electrochemically active materials of diverse morphologies, compositions, and functions. The review begins with tutorials on the operating mechanisms of five commonly used electrochemical techniques, including cyclic voltammetry, potentiostatic deposition, galvanostatic deposition, pulse deposition, and electrophoretic deposition, followed by thorough surveys of the nano-/microstructured materials synthesized electrochemically. Specifically, representative synthesis mechanisms and the state-of-the-art electrochemical performances of exfoliated graphene, conducting polymers, metal oxides, metal sulfides, and their composites are surveyed. The article concludes with summaries of the unique merits, potential challenges, and associated opportunities of electrochemical synthesis techniques for electrode materials in supercapacitors.

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Inverse Opaline Metallic Membrane Addresses the Tradeoff Between Volumetric Capacitance and Areal Capacitance of Supercapacitor

Zhang

Wang

et al. 2021

Advanced Energy Materials

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the active carbon, typically 50-200 F cm −3 (corresponding to 100-300 F g −1 ), [7] the energy density of commercial SCs is limited to 10 Wh L −1 . [8] In order to improve the energy density of SCs, researchers have made tremendous progress in the past decade in developing high-capacitive active materials, including graphene, conductive polymers, metal oxides, and metal hydroxides. [9] However, most of these materials were tested with thin electrodes (mass loading of active materials on current collector less than 1 mg cm −2 , thickness of electrode lower than 10 µm), [10] which cannot achieve a high energy density at a device level because the majority of the volume is occupied by inert materials such as current collectors. When the thickness of the electrode is increased to practical levels required to ensure a high energy density (mass loading of active materials more than 10 mg cm −2 , thickness of electrode higher than 100 µm), the volumetric capacitance often drops significantly due to the low electric and ionic conductivities of thick electrodes. [11] As such, there has been a significant tradeoff between the volumetric capacitance and the thickness of electrodes.A promising solution to mitigate the tradeoff is to assemble the active materials into 3D porous and conductive scaffolds with interconnected ion-diffusion channels. Sun et al. demonstrated the self-assembly of Nb 2 O 5 nanoparticles and holeygraphene into the 3D porous composite electrode, which showed ultrahigh-rate energy storage at a mass loading of more than 10 mg. [11a] Shang et al. reported the vacuum filtration of metal-oxide-immobilized CNTs and holey-graphene into 3D scaffolds, which also pertained to a high capacitance of 143 F cm −3 at an ultrahigh thickness of 420 µm (mass loading 35 mg cm −2 ). [12] Recent developments of highly conductive 2D pseudo materials also show promise to address this issue. MXene, a class of 2D transition metal carbides and nitrides, are highly conductive and high-capacitive materials. [13] Electrodes made of MXene showed superior high-rate performance to those made of conductive polymers, carbon, and metal oxides. Yet, the volumetric capacitance of MXene deteriorated seriously from 900 to 350 F cm −3 when the thickness of the electrode was increased from 5 to 75 µm. [14] Another type of 2D materials, 2D metal-organic frameworks (MOFs), displayed a high Increasing the electrode thickness of energy-storage devices can enhance the areal capacitance, but often results in a significant decrease in the volumetric capacitance. This tradeoff between the volumetric capacitance and electrode thickness, which is ascribed to the poor ion and charge transport in thick electrodes, has been a major obstacle to realizing high-energy-density of devices. Herein, an inverse opaline metallic membrane (IOMM) is reported as a stable and high-rate electrode, which displays a linear increase in volumetric capacitance as a function of electrode thickness. The IOMM is fabricated through simple self-assembly, photopolymerizati...

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Extending the cycle life of high mass loading MoOx electrode for supercapacitor applications

Cited by 20 publications

References 53 publications

Enhancing Li‐Ion Affinity of Molybdenum Dioxide/Carbon Fabric to Achieve High Pseudocapacitance

Enhancing Li‐Ion Affinity of Molybdenum Dioxide/Carbon Fabric to Achieve High Pseudocapacitance

A Review on Nano-/Microstructured Materials Constructed by Electrochemical Technologies for Supercapacitors

Inverse Opaline Metallic Membrane Addresses the Tradeoff Between Volumetric Capacitance and Areal Capacitance of Supercapacitor

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