Recent progresses in high-energy-density all pseudocapacitive-electrode-materials-based asymmetric supercapacitors

Sun, Jinfeng; Wu, Chen; Sun, Xiaofei; Hu, Hong; Chen, Zhi; Hou, Linrui; Yuan, Changzhou

doi:10.1039/c7ta00932a

Cited by 282 publications

(154 citation statements)

References 217 publications

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“…In literature, different approaches have been discussed for enhancing the energy‐storage capacity of SCs while keeping all other features of the SCs the same. Recently, material scientists focused on the development of advanced two‐dimensional (2D) pseudocapacitive electrode materials to improve the energy‐storage capacity of SCs, and more importantly the pseudocapacitive materials are capable of storing electrical charge through ion adsorption as well as surface redox reactions . Notably, pseudocapacitive materials can store more charges than traditional carbon‐based materials.…”

Section: Introductionmentioning

confidence: 99%

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

et al. 2019

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A porous nanostructure and high mass loading are crucial for a pseudocapacitor to achieve a good electrochemical performance. Although pseudocapacitive materials, such as MnO2 and MoS2, with record capacitances close to their theoretical values have been realized, the achieved capacitances are possible only when the electrode mass loading is less than 1 mg cm−2. Increasing the mass loading affects the capacitance as electron conduction and ion diffusion become sluggish. Achieving fast ion and electron transport at high mass loadings through all active sites remains a challenge for high‐mass‐loading electrodes. In this study, 2D MnO2 nanosheets supported on carbon fibers (MnO2@CF) as well as MoS2@CF with high mass loadings (6.6 and 7.2 mg cm−2, respectively) were used in a high‐energy pseudocapacitor. These hierarchical 2D nanosheets yielded outstanding areal capacitances of 1187 and 495 mF cm−2 at high current densities with excellent cycling stabilities. A pliable pseudocapacitive solid‐state asymmetric supercapacitor was designed using MnO2@CF and MoS2@CF as the positive and negative electrodes, respectively, with a high mass loading of 14.2 mg cm−2. The assembled solid‐state asymmetric cell had an energy density of 2.305 mWh cm−3 at a power density of 50 mW cm−3 and a capacitance retention of 92.25 % over 11 000 cycles and a very small diffusion resistance (1.72 Ω s−1/2). Thus, it is superior to most state‐of‐the‐art reported pseudocapacitors. The rationally designed nanostructured electrodes with high mass loading are likely to open up new opportunities for the development of a supercapacitor device capable of supplying higher energy and power.

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Section: Introductionmentioning

confidence: 99%

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

et al. 2019

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“…[14,15] In general, carbon-based materials have been employed as negative electrodes in combination with positive pseudocapacitive electrodes for designing various asymmetric supercapacitors (redox//EDLC type). [21] However, the capacitance of such asymmetric device is limited by the electrode with the lowest capacitive-carbon (1/C T = 1/C + + 1/C −, where C T is total capacitance, C + and Care capacitances of positive and negative electrodes, respectively). [22] Since MXene is a pseudocapacitive material that operates in the negative potential window, [9] combining it with another positive pseudocapacitive material can widen the voltage window of operation.…”

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confidence: 99%

All Pseudocapacitive MXene‐RuO₂ Asymmetric Supercapacitors

Jiang

Kurra

Alhabeb

et al. 2018

Advanced Energy Materials

790

505

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2D transition metal carbides and nitrides, known as MXenes, are an emerging class of 2D materials with a wide spectrum of potential applications, in particular in electrochemical energy storage. The hydrophilicity of MXenes combined with their metallic conductivity and surface redox reactions is the key for high‐rate pseudocapacitive energy storage in MXene electrodes. However, symmetric MXene supercapacitors have a limited voltage window of around 0.6 V due to possible oxidation at high anodic potentials. In this study, the fact that titanium carbide MXene (Ti3C2Tx) can operate at negative potentials in acidic electrolyte is exploited, to design an all‐pseudocapacitive asymmetric device by combining it with a ruthenium oxide (RuO2) positive electrode. This asymmetric device operates at a voltage window of 1.5 V, which is about two times wider than the operating voltage window of symmetric MXene supercapacitors, and is the widest voltage window reported to date for MXene‐based supercapacitors. The complementary working potential windows of MXene and RuO2, along with proton‐induced pseudocapacitance, significantly enhance the device performance. As a result, the asymmetric devices can deliver an energy density of 37 µW h cm−2 at a power density of 40 mW cm−2, with 86% capacitance retention after 20 000 charge–discharge cycles. These results show that pseudocapacitive negative MXene electrodes can potentially replace carbon‐based materials in asymmetric electrochemical capacitors, leading to an increased energy density.

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“…Though both α-FeOOH and Fe 7 S 8 exhibit semimetal properties, the continuous TDOS of Fe 7 S 8 is nearer to Fermi level (E f ) than that of α-FeOOH, indicating the Fe 7 S 8 has the better electrical conductivity than α-FeOOH (Figure 5c). To further illustrate the electron transfer process, the adsorption energies of α-FeOOH (040) facet and Fe 7 Figures S19 and S20, Supporting Information). This phenomenon is due to the unique nano-heterostructure, and can be explained in more detail by PDOS analysis.…”

Section: Wwwadvelectronicmatdementioning

confidence: 99%

“…

nevertheless, they usually put undue emphasis on the capacity of the positive electrode, instead. [7] Looking at what predecessors have been developed for constructing the supercapacitor negative electrode, carbon and Fe-based materials are two major electrodes that can be utilized. As a result, the capacity of the negative electrodes is much lower than that of the positive electrodes, and the capacity mismatch between the positive and negative electrodes is more serious.

…”

mentioning

confidence: 99%

Electric‐Field‐Assisted Enhanced Electron Transfer to Boost Supercapacitor Negative Electrode Performance for a Fabricated Fe₇S₈/α‐FeOOH Nano‐Heterostructure

Zhang

Kong

Zhang

et al. 2019

Adv Elect Materials

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nevertheless, they usually put undue emphasis on the capacity of the positive electrode, instead. There are few reports that discuss the negative electrode materials relatively. As a result, the capacity of the negative electrodes is much lower than that of the positive electrodes, and the capacity mismatch between the positive and negative electrodes is more serious. [6] As a matter of fact, similar to "cask effect," the capacity of the negative electrode is the shortest plank for supercapacitor, which decides how much energy capacity the supercapacitor can store. In other words, the way that can increase the capacity of the negative electrode materials, can remedy the low energy density deficiency of supercapacitor. [7] Looking at what predecessors have been developed for constructing the supercapacitor negative electrode, carbon and Fe-based materials are two major electrodes that can be utilized. [8][9][10] Due to the redox characteristic of Fe-based materials, it is believed to have the higher theoretical capacity compared with carbon materials that presents double layer capacitance characteristics. [11] To our disappointment, the poor electrical conductivity, which affects the efficiency of electronic transmission, resulted in low supercapacitor performance embodiment, far less than what was expected. [12,13] Therefore, how to improve the electrical conductivity to enhance the efficiency of electron transfer is the most important factor when designing and fabricating an Fe-based negative electrode material. [14] To address this challenge, one of the strategies is to fabricate composites with carbon materials. [4,15] On account of the excellent electrical conductivity of carbon materials, the Fe-based compand/carbon composites show good electrical conductivity. However, the low theoretical capacity of carbon materials limits the capacity promotion of Fe-based compand/ carbon composites. Another method is to rationally design a hierarchical nanostructure. [5,14,16,17] Core-shell structure is believed to be a good choice, where materials with good electrical conductivity are used as the core and materials with high theoretical capacity are used as the shell. [13,[18][19][20] Therefore, the good electrochemical performance has been ascribed to its unique structure, which endows the electrode with large specific area and facilitates the contact between the electrode and The shortcoming of Fe-based materials, their poor electron transfer efficiency, restricts their electrochemical performance severely. An electric field (E) is induced by an Fe 7 S 8 /α-FeOOH nano-heterostructure (SACF) via two simple immersion steps at room temperature. The charge transfer from α-FeOOH to Fe 7 S 8 spontaneously establishes an intrinsic electric field at the Fe 7 S 8 /α-FeOOH nano-heterostructure boundary. Additionally, the relationship between structure and property is investigated by structural characterization and density functional theory calculations that are used to explain the electron transfer mechanism and good wettabilit...

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Recent progresses in high-energy-density all pseudocapacitive-electrode-materials-based asymmetric supercapacitors

Abstract: This review elaborately summarizes the latest progress in all-pseudocapacitive asymmetric supercapacitors, including aqueous/nonaqueous faradaic electrode materials, the operating principles, system design/engineering, and rational optimization.

Cited by 282 publications

References 217 publications

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

All Pseudocapacitive MXene‐RuO₂ Asymmetric Supercapacitors

Electric‐Field‐Assisted Enhanced Electron Transfer to Boost Supercapacitor Negative Electrode Performance for a Fabricated Fe₇S₈/α‐FeOOH Nano‐Heterostructure

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Recent progresses in high-energy-density all pseudocapacitive-electrode-materials-based asymmetric supercapacitors

Abstract: This review elaborately summarizes the latest progress in all-pseudocapacitive asymmetric supercapacitors, including aqueous/nonaqueous faradaic electrode materials, the operating principles, system design/engineering, and rational optimization.

Cited by 282 publications

References 217 publications

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

All Pseudocapacitive MXene‐RuO2 Asymmetric Supercapacitors

Electric‐Field‐Assisted Enhanced Electron Transfer to Boost Supercapacitor Negative Electrode Performance for a Fabricated Fe7S8/α‐FeOOH Nano‐Heterostructure

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All Pseudocapacitive MXene‐RuO₂ Asymmetric Supercapacitors

Electric‐Field‐Assisted Enhanced Electron Transfer to Boost Supercapacitor Negative Electrode Performance for a Fabricated Fe₇S₈/α‐FeOOH Nano‐Heterostructure