A polyanionic molybdenophosphate anode for a 2.7 V aqueous pseudocapacitor

Song, Yu; Pan, Deng; Qin, Zengming; Feng, Dongyang; Guo, Di; Sun, Xiaoqi; Liu, Xiaoxia

doi:10.1016/j.nanoen.2019.104010

Cited by 59 publications

(36 citation statements)

References 43 publications

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“…The capacitance contribution from the fast kinetic process (yellow region) is dominant at all potentials, with a total contribution of 93.3%. This value is much higher than the values reported for other pseudocapacitive materials at the same scan rate, demonstrating the excellent ion accessibility of the SF‐3D GA electrode . In contrast, the SF‐GA only has 75.8% of the capacitance that comes from the fast kinetic process.…”

Section: Methodsmentioning

confidence: 57%

3D‐Printed Structure Boosts the Kinetics and Intrinsic Capacitance of Pseudocapacitive Graphene Aerogels

et al. 2020

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The performance of pseudocapacitive electrodes at fast charging rates are typically limited by the slow kinetics of Faradaic reactions and sluggish ion diffusion in the bulk structure. This is particularly problematic for thick electrodes and electrodes highly loaded with active materials. Here, a surface‐functionalized 3D‐printed graphene aerogel (SF‐3D GA) is presented that achieves not only a benchmark areal capacitance of 2195 mF cm−2 at a high current density of 100 mA cm−2 but also an ultrahigh intrinsic capacitance of 309.1 µF cm−2 even at a high mass loading of 12.8 mg cm−2. Importantly, the kinetic analysis reveals that the capacitance of SF‐3D GA electrode is primarily (93.3%) contributed from fast kinetic processes. This is because the 3D‐printed electrode has an open structure that ensures excellent coverage of functional groups on carbon surface and facilitates the ion accessibility of these surface functional groups even at high current densities and large mass loading/electrode thickness. An asymmetric device assembled with SF‐3D GA as anode and 3D‐printed GA decorated with MnO2 as cathode achieves a remarkable energy density of 0.65 mWh cm−2 at an ultrahigh power density of 164.5 mW cm−2, outperforming carbon‐based supercapacitors operated at the same power density.

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Section: Methodsmentioning

confidence: 57%

3D‐Printed Structure Boosts the Kinetics and Intrinsic Capacitance of Pseudocapacitive Graphene Aerogels

et al. 2020

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“…In addition, other field mechanisms are worth of more exploration, such as built‐in electric field of heterostucture. [ 37 ] 2) Fabricating open‐porous‐structure electrodes is facile and straight way to raise the voltage window but suffer from the poor electrochemical cycling performance. The enhancement of voltage window is in virtue of the increased active sites.…”

Section: Discussionmentioning

confidence: 99%

“…The high‐wettability was affirmed by the dynamic contact‐angle measurements (Figure 5e). In addition to the studies of carbon‐based anode, Song et al [ 37 ] used the electro‐deposited molybdenophosphate material as negative electrode, which delivered the ultralow cutoff potential of −1.5 V (Figure 5f,g). Interestingly, the electro‐activation prepared K 1.55 Mo 2 O 4.2 PO 4 built by the corner‐sharing MoO 6 octahedra and PO 4 tetrahedra had the similar internal open tunnels structure with that of C x MnO 2 .…”

Section: Strategies For Constructing Aqueous Supercapacitors Beyond 2mentioning

confidence: 99%

Aqueous Supercapacitor with Ultrahigh Voltage Window Beyond 2.0 Volt

Liu

Huang

2020

Small Structures

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Her research focuses on the design, synthesis, and evaluation of electrode materials for advanced energy storage systems. Tian-Yi Ma received his Ph.D. in physical chemistry in 2013 from Nankai University, China. He then worked as a postdoctoral research fellow from 2013 to 2014 at University of Adelaide, Australia. He is currently a senior lecturer in discipline of chemistry at University of Newcastle, leading an independent research group focusing on energy materials and catalysis.

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“…Metal selenides, like cobalt selenides, also exhibit high specific capacitance values and they are distinguished by the great flexibility of final electrodes that might be interesting for use in personal electronic application (Zhang et al, 2019). Polyanionic molybdenophosphate anodes could largely extend the cathodic stability of water and allow the assembly of 2.7 V aqueous ECs (Song et al, 2019). However, all of these materials suffer from low conductivity, which restricts the fast electron transport required for high rate capability, which can even work as an insulator.…”

Section: Miscellaneous Materialsmentioning

confidence: 99%

Three-Dimensional Architectures in Electrochemical Capacitor Applications – Insights, Opinions, and Perspectives

et al. 2020

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This review focuses on describing the current state-of-the-art research in the synthesis of 3D architectures for electrochemical capacitor applications. The selection is based on both template and non-template strategies. Particular attention has been paid to carbon materials because of their structural interconnection, as they create not only the desired hierarchical porous channels but also ensure high conductivity and mechanical stability. A comprehensive overview of electrode materials is presented here with a detailed discussion of composite solutions, including their advantages and disadvantages. Numerous examples from the literature are presented for individual solutions. The future challenges posed for this type of material are finally summarized.

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A polyanionic molybdenophosphate anode for a 2.7 V aqueous pseudocapacitor

Cited by 59 publications

References 43 publications

3D‐Printed Structure Boosts the Kinetics and Intrinsic Capacitance of Pseudocapacitive Graphene Aerogels

3D‐Printed Structure Boosts the Kinetics and Intrinsic Capacitance of Pseudocapacitive Graphene Aerogels

Aqueous Supercapacitor with Ultrahigh Voltage Window Beyond 2.0 Volt

Three-Dimensional Architectures in Electrochemical Capacitor Applications – Insights, Opinions, and Perspectives

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A polyanionic molybdenophosphate anode for a 2.7 V aqueous pseudocapacitor

Cited by 59 publications

References 43 publications

3D‐Printed Structure Boosts the Kinetics and Intrinsic Capacitance of Pseudocapacitive Graphene Aerogels

3D‐Printed Structure Boosts the Kinetics and Intrinsic Capacitance of Pseudocapacitive Graphene Aerogels

Aqueous Supercapacitor with Ultrahigh Voltage Window Beyond 2.0 Volt

Three-Dimensional Architectures in Electrochemical Capacitor Applications – Insights, Opinions, and Perspectives

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A polyanionic molybdenophosphate anode for a 2.7 V aqueous pseudocapacitor