Asymmetric self-powered cellulose-based aerogel for moisture-electricity generation and humidity sensing

Zhong, Han; Wang, Sijie; Wang, Zhiguo; Jiang, Jianchun

doi:10.1016/j.cej.2024.150203

Chemical Engineering Journal

2024

DOI: 10.1016/j.cej.2024.150203

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Asymmetric self-powered cellulose-based aerogel for moisture-electricity generation and humidity sensing

Han Zhong,

Sijie Wang,

Zhiguo Wang

et al.

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Cited by 12 publications

References 43 publications

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Multifunctional Power Generators beyond Moisture Limitation

Liu,

Li,

Yang

et al. 2024

Adv Funct Materials

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The moisture‐enabled electricity generators (MEGs) represent an appealing clean power strategy within the realm of hydrovoltaic technology. However, their stable operation under all‐weather conditions is still challengeable due to the effect of ambient humidity. Herein, a self‐water‐storage MEGs with multifunctionality was developed. Gel textiles are employed as the proton‐release layer, while graphite fibers loaded with tin‐bismuth alloy liquid metal serve as water‐storing electrode. The gel textiles absorb water permeating down from the electrodes, releasing protons, which then react with the active electrode to enhance output performance. The experiment demonstrates that a device can generate a voltage of 0.55 V and a current of 7.08 μA after water storage, with a maximum power density of 1.14 μW·cm‐². The device's performance output can remain stable within a wide temperature range. The experiment confirms that the electrical output of the device originates from ionic diffusion, while density functional theory (DFT) and molecular dynamics (MD) calculations reveal the importance of the strong hydrolysis ability of the polymer and the high adsorption energy of the liquid metal for H3O+ on the output performance of the device. Furthermore, the integrated device has demonstrated effective applications in driving microelectronic devices, charging capacitors and, self‐powered health monitoring.

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Multifunctional Power Generators beyond Moisture Limitation

Liu,

Li,

Yang

et al. 2024

Adv Funct Materials

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Bismuth‐Based Metal‐Organic Frameworks for Water Vapor Capture and Energy Storage

Ma,

Wang,

Liu

et al. 2024

Adv Funct Materials

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Transforming water vapor into electricity is a critical method for advancing renewable energy supply and alleviating the global energy crisis. However, conventional materials typically struggle to achieve a balance between energy storage and humidity harvesting, making the integration of humidity detection with energy storage technology an emerging challenge. To address this challenge, a novel material design strategy is explored aimed at combining humidity harvesting capabilities with energy storage. Two novel hygroscopic Bi‐based metal‐organic frameworks [Bi2(HABTC)(ABTC)0.5·4H2O] (MOF 1) and [Bi4(ABTC)3(DMF)2]·DMF (MOF 2) are grown in situ on carbon paper electrodes, followed by further modification with polyaniline (PANI). This approach enhances the hygroscopicity of materials, thereby improving electrochemical performance, doubling the energy density compared to traditional coating methods. The integration of humidity‐sensitive polyoxometalates (POMs) electrolytes create a synergistic interaction between the electrode and the electrolyte, enabling effective moisture energy harvesting. At 90% relative humidity (RH) and 70 °C, the constructed solid‐state capacitor demonstrates a high energy density of 40.40 Wh kg−1 at 499.82 W kg−1. This research not only confirms the feasibility of water vapor energy harvesting but also paves an innovative pathway in the field of humidity energy conversion, highlighting its significant potential for future practical applications.

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High‐Performance and Anti‐Freezing Moisture‐Electric Generator Combining Ion‐Exchange Membrane and Ionic Hydrogel

Zhang,

Qin,

Zhou

et al. 2024

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Moisture‐electric generators (MEGs), which convert moisture chemical potential energy into electrical power, are attracting increasing attention as clean energy harvesting and conversion technologies. However, existing devices suffer from inadequate moisture trapping, intermittent electric output, suboptimal performance at low relative humidity (RH), and limited ion separation efficiency. This study designs an ionic hydrogel MEG capable of continuously generating energy with enhanced selective ion transport and sustained ion‐to‐electron current conversion at low RH by integrating an ion‐exchange membrane (IEM‐MEG). A single IEM‐MEG exhibits a maximum open‐circuit voltage (VOC) of 0.815 V and a short‐circuit current (ISC) of 101 µA at 80% RH. Even at a low RH of 10%, a stable VOC of 0.43 V and ISC of 11 µA can be generated. Moreover, the antifreeze performance of the device is improved by adding LiCl, which significantly expands its operational range in low‐temperature environments. Finally, a simple series‐parallel connection of six IEM‐MEGs can yield an enhanced VOC of 4.8 V and a ISC of ≈0.6 mA, and the scalable units can directly power commercial electronics. This study provides new insights into the design of MEGs that will advance the development of green energy conversion technologies in the future.

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Asymmetric self-powered cellulose-based aerogel for moisture-electricity generation and humidity sensing

Cited by 12 publications

References 43 publications

Multifunctional Power Generators beyond Moisture Limitation

Multifunctional Power Generators beyond Moisture Limitation

Bismuth‐Based Metal‐Organic Frameworks for Water Vapor Capture and Energy Storage

High‐Performance and Anti‐Freezing Moisture‐Electric Generator Combining Ion‐Exchange Membrane and Ionic Hydrogel

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