A Robust and Adhesive Hydrogel Enables Interfacial Coupling for Continuous Temperature Monitoring

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(33)

Published: April 25, 2023

Abstract Continuous temperature monitoring by flexible hydrogel‐based electronics achieves rapid advances, overcoming the drawbacks of rigid and unportable thermocouples. However, an open question is whether how thermosensitive hydrogel designing can prevent mechanical mismatching between devices skin‐tissues reduces interfacial failure. Herein, a versatile thermistor epidermal sensor (HTES) paradigm engineered consisting self‐adhesive function layer (PEST) in tandem with surface spraying Ag interdigital electrode. Leveraging advantage catechol chemistry inspired tannic acid‐coated cellulose nanocrystals, resultant PEST adhesion‐cohesion equilibrium along superior thermosensitivity. The assembled HTES thereby yields unprecedented features thermosensitivity (TCR = 1.43% °C −1 ), exceptional integrity (hammering 200 cycles, current variation <9%), impressive compatibility (adhesion strength, 25 kPa), environmental stability (thermosensation retention 98% over 5 days). By in‐situ microstructure observation, unique geometrical synchronization arbitrary curvilinear surfaces (e.g., sphere, cone, saddle) stemming from elastic dissipation discrete rupture adhesive fibrillar bridges validated, affording competitive advantages than that state‐of‐the‐art for alleviating deterioration, which dramatically inspires advanced design strategies paves way commercialization attachable electronics.

Language: Английский

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Interlayer Injection of Low‐Valence Zn Atoms to Activate MXene‐Based Micro‐Redox Capacitors With Battery‐Type Voltage Plateaus

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(43)

Published: June 21, 2023

Abstract Insufficient and unstable energy output is the bottleneck issue radically restricting application of micro‐supercapacitors (MSCs). Herein, an interlayer atom injection strategy that can anchor low‐valence Zn atoms (Zn δ + , 0 < <2) on O‐terminals Ti 3 C 2 T x (MXene) flakes within MXene/silver‐nanowires hybrid cathode symmetric MSCs first presented. Combining polyacrylamide/ZnCl hydrogel electrolyte rich in Cl − 2+ ions, matched /Zn (−0.76 V vs SHE) Ag/AgCl (0.23 SHE), redox couples between symmetrical electrodes are activated to offer faradaic charge storage beside ions‐intercalation involved pseudocapacitance. Thus, a battery‐type voltage plateau (≈0.9 V) appears discharge curve fabricated pseudo‐symmetric micro‐redox capacitor, simultaneously achieving density enhancement (117 µWh cm −2 at 0.5 mA ) substantially improved power stability (46% from region) relative before activation (98 without platform). The work provides fire‐new overcome performance bottlenecks confronting conventional MSCs.

Language: Английский

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Constructing MXene hydrogels and aerogels for rechargeable supercapacitors and batteries

Journal of Materials Chemistry C, Journal Year: 2023, Volume and Issue: 11(7), P. 2414 - 2429

Published: Jan. 1, 2023

This review mainly introduces and discusses the recent progress of MXene hydrogels aerogels, focusing on their synthesis strategy, applications, challenges perspectives in rechargeable supercapacitors batteries.

Language: Английский

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Carbon Nanotube Network Topology-Enhanced Iontronic Capacitive Pressure Sensor with High Linearity and Ultrahigh Sensitivity

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(40), P. 47327 - 47337

Published: Sept. 28, 2023

Flexible capacitive pressure sensors with high sensitivity over a wide range are highly anticipated in the fields of tactile perception and physiological signal monitoring. However, despite introduction microstructures on electrolyte layer, deformability is still limited due to size limitation microstructures, making it difficult significantly improve iontronic (ICPSs). Here, we propose an innovative strategy combining carbon nanotubes (CNTs) topological networks ionic hydrogel micropyramid array that can enhance flexible ICPSs for ultrasensitive detection. Compared other previously reported ICPSs, sensor developed this work exhibits unprecedented (Smin > 1050 kPa-1) linear response (R2 0.99) (0.03-28 kPa) enabled by CNT percolation inside microstructred layer. This ICPS also effectively detect from variety sources, including sound waves, lightweight objects, tiny signals, such as pulse rate heartbeat. provides general achieve both broader pressure-response higher sensitivity, which stable efficient way low-cost, scalable sensitive sensing human-computer interaction applications.

Language: Английский

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Surface oxygen engineered ZnCo2O4 planar hybrid supercapacitor electrode for high energy applications

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 98, P. 112954 - 112954

Published: July 25, 2024

Language: Английский

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Optimization of Quantum Capacitance of Functionalized VS₂ Monolayer Electrodes to Shrink Hybrid Supercapacitors for On-Chip Energy Sources

ACS Applied Electronic Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 8, 2025

Quantum capacitance (CQ) of the electrodes plays an important role in enhancing performance supercapacitors by directly affecting overall capacitance. In this study, several approaches including doping, creating vacancy, and adsorption have been used to enhance CQ vanadium disulfide (VS2) electrode using density functional theory calculation. The undoped VS2 monolayer shows a maximum value 20.19 μF/cm2. After V-vacancy (Vv) lattice, increased 35.61 μF/cm2, which is highest among all doped defective lattices at room temperature. When we use for supercapacitors, generally ion occurs surface, showing necessity investigate alkali/alkaline atoms (Li, Na, K, Mg) surface know change different properties electrode. It found that reduces due but K-adsorption S-vacancy (Vs) demonstrated increment from 21.75 35.32 μF/cm2 Additionally, variation distance K atom Vs-VS2 revealed optimum 3.5 Å, indicating (radius = 2.43 Å) stabilizes just above surface. Moreover, augmentation was seen with decrease temperature attained 49.96 100 K. calculated open-circuit voltage (OCV) duly confirmed K-adsorbed potential candidate anode hybrid as it has positive side electrochemical average OCV +0.615 V. This study reveals can be minimize size high-performance its application on-chip energy source.

Language: Английский

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Recent progress in photolithography technique to fabricate micro-supercapacitors

Journal of Energy Storage, Journal Year: 2025, Volume and Issue: 114, P. 115862 - 115862

Published: Feb. 21, 2025

Language: Английский

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Advancing MXene-based integrated microsystems with micro-supercapacitors and/or sensors: Rational design, key progress, and challenging perspectives

Journal of Materiomics, Journal Year: 2023, Volume and Issue: 9(6), P. 1242 - 1262

Published: Sept. 25, 2023

The escalating demand for micro/nano-sized devices, such as micro/nano-robots, intelligent portable/wearable microsystems, and implantable medical microdevices, necessitates the expeditious development of integrated microsystems incorporating energy conversion, storage, consumption. Critical bottlenecks in microscale storage/sensors their systems are being addressed by exploring new technologies materials, e.g., MXene, holding great potential developing lightweight deformable microdevices. This review summarizes latest progress milestones realization MXene-based micro-supercapacitors (MSCs) sensor arrays, thus discusses design fundamentals key advancements conversion-storage-consumption microsystems. Finally, we outline challenges fabricating MSCs/sensors self-powered which is crucial practical applications. Particularly, illuminate viable solutions to unsolved issues highlight exciting opportunities.

Language: Английский

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Wood‐Like Low‐Tortuosity Thick Electrode for Micro‐Redoxcapacitor with Ultrahigh Areal Energy Density and Steady Power Output

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(11)

Published: Dec. 3, 2023

Abstract Conventional MXene‐based thick electrodes with stacked and tortuous microstructures suffer from sluggish charge transport low‐utilization of active substances, thus a limited boost in areal energy density the assembled micro‐supercapacitors (MSCs). Herein, duplication wood‐like microstructure is realized MXene/Ag‐nanowires (AgNWs) hybrid aerogel electrode (WL‐M/A‐AE) via directional freeze‐drying technique. Benefitting uniform 3D vertically‐aligned microchannels as highways for ions throughout matrix, WL‐M/A‐AE thickness up to 2000 µm can achieve 50‐times higher Cl − diffusion coefficient relative closely restacked film same mass loading MXene. Furthermore, evenly interspersed AgNWs serving percolation network within matrix facilitate horizontal electrons transmission between loose MXene flakes, while reversibly capture/release phase conversion (Ag⇔AgCl) raise storage capacity WL‐M/A‐AE. Thus, when coupling Zn anode, micro‐redoxcapacitor adopting polyacrylamide/ZnCl 2 +NH 4 hydrogel electrolyte deliver an 292.5 µWh cm −2 more stable way (a smooth discharge plateau contributing 40.9% energy). The demonstrated low‐tortuosity promises effective avenue tackling performance bottlenecks facing traditional MSCs.

Language: Английский

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Low-cost micro-supercapacitors using porous Ni/MnO2 entangled pillars and Na-based ionic liquids

Energy storage materials, Journal Year: 2023, Volume and Issue: 63, P. 102986 - 102986

Published: Sept. 25, 2023

Language: Английский

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