Cu2+ intercalation activates bulk redox reactions of MnO2 for enhancing capacitive performance

Hu, Lingyuan; Gao, Rui; Zhang, Anqi; Yang, Renqiang; Zang, Xiaogang; Wang, Shiyu; Yao, Shuyun; Yang, Zhiyu; Hao, Haigang; Yan, Yi‐Ming

doi:10.1016/j.nanoen.2020.104891

Cited by 66 publications

(27 citation statements)

References 31 publications

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“…In addition, δ‐MnO 2 ‐based layered materials, intercalated with other ions such as Li + , K + and Cs + , Co 2+ , Cu 2+ , Zn 2+ , and Fe 3+ by molten salt or ion exchange methods have been successively reported. [ 18,144,145 ] By melting different alkali metal nitrates (NaNO 3 , KNO 3 , and CsNO 3 ), the alkali ion reacts with manganese precursors to generate [MnO 6 ] structure. These metal cations intercalated into the interlayers help to keep the stability of the layer structure and balance the charge.…”

Section: Types Of Intercalation Compounds and Their Applicationmentioning

confidence: 99%

Regulating Intercalation of Layered Compounds for Electrochemical Energy Storage and Electrocatalysis

Yang

Tamirat

Bin

et al. 2021

Adv Funct Materials

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Layered materials have received extensive attention for widespread applications such as energy storage and conversion, catalysis, and ion transport owing to their fast ion diffusion, exfoliative feature, superior mechanical flexibility, tunable bandgap structure, etc. The presence of large interlayer space between each layer enhances intercalation of the guest ion or molecule, which is beneficial for fast ion diffusion and charge transport along the channels. This intercalation reaction of layered compounds with guest species results in material with improved mechanical and electronic properties for efficient energy storage and conversion, catalysis, ion transport, and other applications. This review extensively discusses the intercalation of guest ionic or molecular species into layered materials used for various types of applications. It assesses the intercalation strategies, mechanism of ionic or molecular intercalation reactions, and highlights recent advancements. The electrochemical performances of several typical intercalated materials in batteries, supercapacitors, and electrocatalytic systems have been thoroughly discussed. Moreover, the challenges in the design and intercalation of layered materials, as well as prospects of future development are highlighted.

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Section: Types Of Intercalation Compounds and Their Applicationmentioning

confidence: 99%

Regulating Intercalation of Layered Compounds for Electrochemical Energy Storage and Electrocatalysis

Yang

Tamirat

Bin

et al. 2021

Adv Funct Materials

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“…Supercapacitors (SCs) as the new energy storage equipment have gained widespread attention owing to their high power density, long cycling life, and excellent reliability. − As the crucial part of SCs, electrode materials have presented the trend of blowout development. As promising electrode materials, carbon, metal oxide/sulfide, conducting polymers, and MXene have been extensively explored in SCs.…”

Section: Introductionmentioning

confidence: 99%

The Critical Role of Oxygen-Containing Functional Groups in the Etching Behavior of Activators to Carbon Materials

Zhang

Zhou

et al. 2021

ACS Sustainable Chem. Eng.

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Fully activating the carbon matrix to obtain a high specific surface area (SSA) has been a practical approach to enhance the electrochemical performance of carbon materials. Much research mentioned that the activation has a large influence on the oxygen-containing functional groups (OCFGs) of the porous carbon. However, the potential impact of OCFGs ubiquitous in carbon precursors on the etching behavior of activators is rarely studied. Herein, a pitaya peel with a high oxygen content is employed as the carbon matrix and then a series of porous carbon materials are synthesized by a one-step pyrolysis strategy using different activators. We found that the existence of OCFGs in the carbon materials is conducive to enhancing the etching behavior. Theoretical calculations reveal that OCFGs in the carbon matrix could induce the local charge redistributions, thereby improving the binding affinity between the activators and the carbon atoms near OCFGs. Consequently, activators tend to etch carbon atoms around the OCFGs in the carbon precursors. Based on this, the optimized sample exhibits an ultrahigh SSA of 3699 m 2 g −1 , superior capacitance (373 F g −1 at 1 A g −1 ), and excellent rate performance. This work contributes to understanding the role of OCFGs in the etching behavior of activators to carbon materials.

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“…5,6 Compared to many secondary batteries, supercapacitors (SCs) have also attracted intensive attention due to their relatively higher power density, faster charge/discharge rate, and longlasting cycle life. [7][8][9] The present advances mainly concentrate on pore engineering, morphology modulation, and composition regulation of electrode materials for highperformance SCs. [10][11][12][13] However, the demand of highenergy-density SCs is not easily attainable for the widely used porous carbon in a powdery form owing to the following reasons: (i) addition of polymer binder inevitably compromises SCs performance because of pore blocking behavior, enlarged internal resistance, and poor interface stability of binder 14 and (ii) low areal mass loading of active materials due to the presence of inactive components (current collector, binder, conductive agent) hinders the energy density of whole SC device.…”

Section: Introductionmentioning

confidence: 99%

Nature‐inspired porous multichannel carbon monolith: Molecular cooperative enables sustainable production and high‐performance capacitive energy storage

Liu

Zheng

et al. 2021

InfoMat

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The advancement of supercapacitors (SCs) is closely bound up with the breakthrough of rational design of energy materials. Freestanding and thick carbon (FTC) materials with well-organized porous structure is promising SC electrode delivering high areal capacitive performance. However, controllable and sustainable fabrication of such FTC electrode is still of great challenges. Inspired by natural honeycombs with cross-linked multichannel structure, herein, an innovative molecular-cooperative-interaction strategy is elaborately provided to realize honeycomb-like FTC electrodes. The nitrogen-doped porous carbon monolith (N-PCM) is obtained with advantages of interconnect pore structure and abundant nitrogen doping. Such strategy is based on naturally abundant molecular precursors, and free of pore-templates, expensive polymerization catalyst, and dangerous reaction solvent, rendering it a sustainable and cost-effective process. Systematic control experiments reveal that strong interactions among molecular precursors promise the structural stability of N-PCM during carbonization, and rational selection of molecular precursors with chemical blowing features is key step for well-developed honeycomb-like pore structure. Interestingly, the optimized sample exhibits hierarchical pore structure with specific surface area of 626.4 m 2 g À1 and rational N-doping of 7.01 wt%. The derived SC electrode with high mass loading of 40.1 mg cm À2 shows an excellent areal capacitance of 3621 mF cm À2 at 1 mA cm À2 and good rate performance with 2920 mF cm À2 at 25 mA cm À2 . Moreover, the constructed aqueous symmetric SC and quasi-solid-state SC produce high energy densities of 0.32 and 0.27 mWh cm À2 , respectively. We believe that such a composition/microstructure controllable method can promote the fabrication and development of other thick electrodes for energy storage devices.

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Cu2+ intercalation activates bulk redox reactions of MnO2 for enhancing capacitive performance

Cited by 66 publications

References 31 publications

Regulating Intercalation of Layered Compounds for Electrochemical Energy Storage and Electrocatalysis

Regulating Intercalation of Layered Compounds for Electrochemical Energy Storage and Electrocatalysis

The Critical Role of Oxygen-Containing Functional Groups in the Etching Behavior of Activators to Carbon Materials

Nature‐inspired porous multichannel carbon monolith: Molecular cooperative enables sustainable production and high‐performance capacitive energy storage

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