Synchronously manipulating Zn2+ transfer and hydrogen/oxygen evolution kinetics in MXene host electrodes toward symmetric Zn-ions micro-supercapacitor with enhanced areal energy density

Cao, Zhan; Fu, Jimin; Wu, Mingzai; Hua, Tao; Hu, Haibo

doi:10.1016/j.ensm.2021.04.047

Cited by 107 publications

(78 citation statements)

References 53 publications

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“…The few-layered Ti 3 C 2 T x building blocks (Figure S1a, Supporting Information) were prepared by a well-established liquid-phase exfoliation method reported previously. [36,37] XRD characterization (Figure S1b, Supporting Information) shows the disappearance of the characteristic peaks of the Ti 3 AlC 2 -MAX phase and the presence of a new peak at ≈6°, suggesting the obtainment of few-layered MXene. Figure S1c, Supporting Information, presents the morphology of the employed 1D AgNWs with an average diameter of 50 nm, which were synthesized based on a polyol method developed by us.…”

Section: Resultsmentioning

confidence: 99%

“…The MRCA can be readily serial or parallel connected using our previously reported liquid-metal island-bridge architecture. [27,37] As shown in Figure 4d,e, an MRCA consisting of two series-connected MRCs can output a voltage of 2.72 V, twice the value of a single MRC. In addition, the combined capacitance of the MRCA consisting of two parallel-connected MRCs is doubled from the 359 mF for a single MRC to 715 mF, as shown in Figure 4f,g.…”

Section: Resultsmentioning

confidence: 99%

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Micro‐Redoxcapacitor: A Hybrid Architecture Out of the Notorious Energy‐Power Density Dilemma

Cao

2022

Adv Funct Materials

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Insufficient areal energy density along with unstable delivery, resulting from a linearly sloped time‐voltage response rooting in redox‐free/surface‐redox operating mechanisms severely restricts the application scenarios of micro‐supercapacitors. Herein, by coupling silver nanowires (AgNWs) between MXene interlayers with the help of bacterial cellulose (BC) as bio‐dispersant toward MXene/AgNWs&BC hybrid cathode to pair with Zn anode, a novel Zn2+‐Cl− dual‐ions micro‐redox capacitor (MRC) employing polyacrylamide/ZnCl2 + NH4Cl hydrogel electrolyte is first present. The introduced AgNWs nanopillars alleviate the MXene nanosheets restacking to facilitate Cl− transfer kinetics, and concurrently strengthen the charge storage capacity and output stability benefiting from a flat discharge plateau stemming from the extra phase transition behavior (Ag⇔AgCl). Thus, an appealing dual energy storage mechanism, featuring i) expedited Cl− diffusion involved de/intercalation and ii) reversible solid‐to‐solid conversion of Ag/AgCl redox couple confined between MXene interlayers, is established and revealed by in situ XRD/Raman analyses. Consequently, remarkably boosted areal energy density up to 227 μWh cm−2 along with significantly improved output stability and suppressed notorious self‐discharge behavior, are achieved in the resultant MRC. This work provides a brand new strategy for designing innovative MXene‐based MRC featuring a hybrid charge storage mechanism of ions‐intercalation and phase conversion to simultaneously realize high and steady energy output.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Micro‐Redoxcapacitor: A Hybrid Architecture Out of the Notorious Energy‐Power Density Dilemma

Cao

2022

Adv Funct Materials

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“…This is partly caused by the formidable challenges of sustaining a high current rate while maximizing high cell voltage within a narrow electrochemical window in aqueous electrolytes. [ 17 ] The output voltage for APPBs is determined by the potential difference between the cathode and anode. For anodes, the primary challenge is to develop n‐type quinone‐RAPs that can sustain redox activity as low as the proton reduction potential in aqueous electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Catechol‐Grafting PEDOT Cathode for an All‐Polymer Aqueous Proton Battery with High Voltage and Outstanding Rate Capacity

et al. 2021

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Aqueous all-polymer proton batteries (APPBs) consisting of redox-active polymer electrodes are considered safe and clean renewable energy storage sources. However, there remain formidable challenges for APPBs to withstand a high current rate while maximizing high cell output voltage within a narrow electrochemical window of aqueous electrolytes. Here, a capacitive-type polymer cathode material is designed by grafting poly(3,4-ethylenedioxythiophene) (PEDOT) with bioinspired redox-active catechol pendants, which delivers high redox potential (0.60 V vs Ag/AgCl) and remarkable rate capability. The pseudocapacitive-dominated proton storage mechanism illustrated by the density functional theory (DFT) calculation and electrochemical kinetics analysis is favorable for delivering fast charge/discharge rates. Coupled with a diffusion-type anthraquinone-based polymer anode, the APPB offers a high cell voltage of 0.72 V, outstanding rate capability (64.8% capacity retention from 0.5 to 25 A g −1 ), and cycling stability (80% capacity retention over 1000 cycles at 2 A g −1 ), which is superior to the state-of-the-art all-organic proton batteries. This strategy and insight provided by DFT and ex situ characterizations offer a new perspective on the delicate design of polymer electrode patterns for high-performance APPBs.

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“…Stretchable all-solid-state microsupercapacitor arrays based on the films exhibited an areal energy density of 5.52 µWh cm −2 . Cao et al [94] developed a MXene/BC hybrid composite film electrode, which possessed an areal capacitance of 178.6 mF cm −2 at 0.8 mA cm −2 . The corresponding symmetrical aqueous Zn-ion microsupercapacitor had an areal energy density of 34.0 µWh cm −2 at a current density of 0.8 mA cm −2 in 2 m Zn(CF 3 SO 3 ) 2 /PAM hydrogel electrolyte, which was nearly increased by 4 times as compared with the value when using the conventional H 2 SO 4 /PAM hydrogel electrolyte.…”

Section: Mxene/1d Materialsmentioning

confidence: 99%

Flexible MXene‐Based Composite Films: Synthesis, Modification, and Applications as Electrodes of Supercapacitors

Luo

Que

Bin

et al. 2022

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MXenes, as a 2D planar structure nanomaterial, were first reported in 2011. Due to their large specific surface area, high ductility, high electrical conductivity, strong hydrophilic surface, and high mechanical flexibility, MXenes have been extensively explored in the development of various functional materials with desired performances. This review is aimed to summarize the current progress in synthesis, modification, and applications of MXene‐based composite films as electrode materials of flexible energy storage devices. In the synthesis of MXenes, the evolution and exploration of etchants are emphasized. Furthermore, in order to develop MXene‐based composite films, the components used to modify the MXene nanoflakes, including 0D, 1D, and 2D nanomaterials, are summarized, and the perspectives and research direction of such materials are also discussed.

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Synchronously manipulating Zn2+ transfer and hydrogen/oxygen evolution kinetics in MXene host electrodes toward symmetric Zn-ions micro-supercapacitor with enhanced areal energy density

Cited by 107 publications

References 53 publications

Micro‐Redoxcapacitor: A Hybrid Architecture Out of the Notorious Energy‐Power Density Dilemma

Micro‐Redoxcapacitor: A Hybrid Architecture Out of the Notorious Energy‐Power Density Dilemma

Bioinspired Catechol‐Grafting PEDOT Cathode for an All‐Polymer Aqueous Proton Battery with High Voltage and Outstanding Rate Capacity

Flexible MXene‐Based Composite Films: Synthesis, Modification, and Applications as Electrodes of Supercapacitors

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