Aqueous MXene/PH1000 Hybrid Inks for Inkjet‐Printing Micro‐Supercapacitors with Unprecedented Volumetric Capacitance and Modular Self‐Powered Microelectronics

Ma, Jiaxin; Zheng, Shuilin; Cao, Yuexian; Zhu, Yuanyuan; Das, Pratteek; Wang, Hui; Liu, Yu; Wang, Jiemin; Chi, Liping; Liu, Shengzhong; Wu, Zhong‐Shuai

doi:10.1002/aenm.202100746

Cited by 105 publications

(132 citation statements)

References 60 publications

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“…[16][17][18] Nonetheless, the restacking of MXene nanosheets induced by strong van der Waals force limits the interlayer space, thus severely blocking the (de)intercalation of ions, especially for the preferable anions and multivalent cations with high charge densities but large ionic radii (Scheme 1a). [19,20] This results in limited charge storage capacity and sluggish charge transfer kinetics, thus low areal capacitance and rate performance. [21][22][23][24][25] It is well-known that inorganic/organic nanopillars can be inserted between MXene nanosheets to mitigate the restacking of MXenes nanosheets and expand the interlayer space.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Cao

2022

Adv Funct Materials

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“…Such a high areal capacitance surpasses most previous MXene‐based supercapacitors and is comparative with many state‐of‐the‐art works (Supplementary Figure S12). 12,13,16–18,20,23 …”

Section: Resultsmentioning

confidence: 99%

Boosting the energy density of aqueous MXene‐based supercapacitor by integrating 3D conducting polymer hydrogel cathode

Chu

Wang

Cai

et al. 2022

SusMat

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The wide‐spread proliferation of aqueous MXene‐based supercapacitor has been largely shadowed by the limited cell potential window (typically in the range of 0–0.6 V). To address this baffling issue, designing asymmetric supercapacitor (ASC) is proposed as a rational strategy to enlarge the potential window (thus energy density) of individual cell in aqueous electrolytes. To this date, however, it still remains a great challenge to develop easy fabricating, 3D nanostructured, and pseudocapacitive cathode materials that can perfectly match with MXene anode materials. In this work, we propose a supramolecular strategy to construct conducting polymer hydrogel (CPH) with highly interconnected 3D nanostructures and large pseudocapacitance, which can finely match with 2D Ti3C2Tx. The as‐assembled CPH//Ti3C2Tx ASC with CPH cathode and MXene anode can operate in a broadened potential window of 1.15 V in aqueous PVA/H2SO4 gel electrolyte with remarkably improved energy density of 16.6 μWh/cm2 (nine times higher than that of symmetric MXene supercapacitor). Additionally, this ASC exhibits outstanding cyclic stability with no trackable performance decay over 30,000 galvanostatic charge and discharge cycles. It is demonstrated in this work that employing positive CPH electrode is a feasible yet promising strategy to enhance the potential window and energy density of aqueous MXene supercapacitors.

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“…Together with their high conductivity, good mechanical properties and superior capacitive performance, MXenes can be considered as an ideal ink material for printing 3D MSC. [107,108] As shown in Figure 10a, a diluted and uniformly dispersed mixture of MXene, Ag nanowires (NWs), MnO NWs and C60 was prepared by gentle ultrasonic treatment, and then the mixture was vacuum filtered to obtain the MXene-Ag NWs-MnO NWs-C60 hydrogel. [102] The Ag NWs and MnO NWs dispersed in deionized water were combined with the flexible and hydrophilic MXene nanosheets and interwoven into a dynamically crosslinked 3D network.…”

Section: D Printingmentioning

confidence: 99%

Three‐Dimensional MXenes for Supercapacitors: A Review

Zhu

et al. 2022

Small Methods

111

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However, limited by their high contact resistance, insufficient charge storage, and low electrode density, the activated carbons only show an inadequate capacitance range of 60-200 F cm −3 . [7,8] In comparison, the pseudocapacitive materials, such as conducting polymers and metal oxides, exhibit higher capacitance based on their fast non-diffusion limited surface Faraday redox reactions, [9] whereas poor conductivity and unstable cycle performance restrict their wide-spectrum application. [10,11] Several efforts have been made to develop the intercalation pseudocapacitive electrode materials, which store charge via fast ion intercalation and thus combine the high energy density of batteries and the high power density of supercapacitors. [12,13] 2D transitional metal carbides/nitrides, also known as MXenes, have attracted much attention since firstly reported in 2011. [14] MXenes have a general formula of M n + 1 X n T x , where M is a transition metal, X is carbon or/and nitrogen, n can be an integer between 1 and 4, and T x stands for surface-terminating functional groups (-OH, -F, -O, etc.). [15,16] MXenes could be obtained by selectively etching the A atomic layer from their layered MAX phase precursors (M n + 1 AX n ) with different etchants. [14,17,18] Currently, more than 100 kinds of MXenes have been predicted, among which about 40 compositions have been experimentally synthesized and Ti 3 C 2 T x is the most studied member. Various compositions and ratios of M and X elements, together with different surface terminations, endow MXene materials with special and tunable structures and properties. As a result, they have rapidly aroused tremendous interest for various applications, including energy storage, [19][20][21][22][23] catalysis, [24] electromagnetic interference shielding, [25] water purification, [26] reinforcement for composites, [27] etc.More specifically, MXene materials are promising electrode materials for supercapacitors, as they have 2D lamellar structure, high electrochemically active surface, metallic-like electrical conductivity, tunable surface-terminating functional groups, good dispersibility in various solvents, and outstanding mechanical flexibility. [28][29][30] Due to their 2D structure and polar terminations, MXenes allow ions (e.g., H + , Li + , Na + ) to intercalate/de-intercalate fast between the layers. [20,31] In basic and neutral aqueous electrolytes, the intercalated ions are surrounded by water molecules, leading to an inner EDLC mechanism with common capacitances of 60-150 F g -1 , [32] while in H 2 SO 4 electrolyte, the intercalated H + protons can bond/ debond with the oxygen-containing terminations on the MXene Supercapacitors have the characteristics of high power density and long cycle life, but the low energy density limits their further development. The 2D transitional metal carbides/nitrides (MXenes) show great application prospects in the field of supercapacitors due to their superior volumetric capacitance, metallic-like conductivity, tunable surface termination...

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Aqueous MXene/PH1000 Hybrid Inks for Inkjet‐Printing Micro‐Supercapacitors with Unprecedented Volumetric Capacitance and Modular Self‐Powered Microelectronics

Abstract: Research data are not shared.

Cited by 105 publications

References 60 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

Boosting the energy density of aqueous MXene‐based supercapacitor by integrating 3D conducting polymer hydrogel cathode

Three‐Dimensional MXenes for Supercapacitors: A Review

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